John Bellum, PhD

Consultant in Optical Coatings, Coherent Technologies, Albuquerque, NM, USA

Albuquerque, New Mexico, United States of America

Research Expertise

Optical coatings for high energy lasers
Laser damage resistant optical coatings
Laser optics
Materials science
Surfaces and interfaces
Surfaces, coatings, and films
Optical materials

About

I am a consultant specializing in laser damage resistant optical coatings. I have extensive experience as a physicist and optical engineer, with BS and PhD degrees in physics, SPIE and Optica (formerly Optical Society of America) senior memberships, and 50+ scientific publications.  My expertise in laser damage resistant optical coatings is based on my experience at Sandia National Laboratories where, from 2004 to 2017, I designed and produced optical coatings for the meter-size optics of Sandia’s petawatt-class Z-Backlighter high energy lasers. I was a distributor for OptiLayer Thin Film Software from 2017 to 2022.

Publications

Electronic-to-vibrational energy transfer in collisions of excited sodium with molecular hydrogen

The Journal of Chemical Physics / Aug 15, 1979

McGuire, P., & Bellum, J. C. (1979). Electronic-to-vibrational energy transfer in collisions of excited sodium with molecular hydrogen. The Journal of Chemical Physics, 71(4), 1975–1976. https://doi.org/10.1063/1.438512

Quantum mechanical theory of collisional ionization in the presence of intense laser radiation

The Journal of Chemical Physics / Jan 01, 1978

Bellum, J. C., & George, T. F. (1978). Quantum mechanical theory of collisional ionization in the presence of intense laser radiation. The Journal of Chemical Physics, 68(1), 134–144. https://doi.org/10.1063/1.435503

Reactive ion-assisted deposition of e-beam evaporated titanium for high refractive index TiO2 layers and laser damage resistant, broad bandwidth, high-reflection coatings

Applied Optics / Dec 23, 2013

Bellum, J., Field, E., Kletecka, D., & Long, F. (2013). Reactive ion-assisted deposition of e-beam evaporated titanium for high refractive index TiO2 layers and laser damage resistant, broad bandwidth, high-reflection coatings. Applied Optics, 53(4), A205. https://doi.org/10.1364/ao.53.00a205

Meeting thin film design and production challenges for laser damage resistant optical coatings at the Sandia Large Optics Coating Operation

SPIE Proceedings / Oct 07, 2009

Bellum, J., Kletecka, D., Rambo, P., Smith, I., Kimmel, M., Schwarz, J., Geissel, M., Copeland, G., Atherton, B., Smith, D., Smith, C., & Khripin, C. (2009). Meeting thin film design and production challenges for laser damage resistant optical coatings at the Sandia Large Optics Coating Operation. In G. J. Exarhos, V. E. Gruzdev, D. Ristau, M. J. Soileau, & C. J. Stolz (Eds.), Laser-Induced Damage in Optical Materials: 2009. SPIE. https://doi.org/10.1117/12.836597

Sandia's Z-Backlighter Laser Facility

SPIE Proceedings / Dec 06, 2016

Rambo, P., Schwarz, J., Schollmeier, M., Geissel, M., Smith, I., Kimmel, M., Speas, C., Shores, J., Armstrong, D., Bellum, J., Field, E., Kletecka, D., & Porter, J. (2016). Sandia’s Z-Backlighter Laser Facility. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), Laser-Induced Damage in Optical Materials 2016. SPIE. https://doi.org/10.1117/12.2245271

Comparisons of hafnia/silica anti-reflection coatings

Optical Interference Coatings / Jan 01, 2010

Bellum, J., Kletecka, D., Potter, J., Rambo, P., Smith, I., Schwarz, J., & Atherton, B. (2010). Comparisons of hafnia/silica anti-reflection coatings. Optical Interference Coatings. https://doi.org/10.1364/oic.2010.fa8

THEORY OF MOLECULAR RATE PROCESSES IN THE PRESENCE OF INTENSE LASER RADIATION

Chemical and Biochemical Applications of Lasers / Jan 01, 1979

George, T. F., Zimmerman, I. H., DeVries, P. L., Yuan, J.-M., Lam, K.-S., Bellum, J. C., Lee, H.-W., Slutsky, M. S., & Lin, J. (1979). THEORY OF MOLECULAR RATE PROCESSES IN THE PRESENCE OF INTENSE LASER RADIATION. In Chemical and Biochemical Applications of Lasers (pp. 253–354). Elsevier. https://doi.org/10.1016/b978-0-12-505404-1.50011-8

A coupled channels approach to Penning ionization of Ar BY He*(Is2s, 3S)

Chemical Physics / Feb 01, 1977

Bellum, J. C., & Micha, D. A. (1977). A coupled channels approach to Penning ionization of Ar BY He*(Is2s, 3S). Chemical Physics, 20(1), 121–127. https://doi.org/10.1016/0301-0104(77)85119-7

Impact of different cleaning processes on the laser damage threshold of antireflection coatings for Z-Backlighter optics at Sandia National Laboratories

Optical Engineering / Nov 06, 2014

Field, E., Bellum, J., & Kletecka, D. (2014). Impact of different cleaning processes on the laser damage threshold of antireflection coatings for Z-Backlighter optics at Sandia National Laboratories. Optical Engineering, 53(12), 122516. https://doi.org/10.1117/1.oe.53.12.122516

Coupling of discrete and continuum electronic states in atom-atom collisions: A coupled-channels investigation of Penning ionization inHe*(1s2s, S3)+ Ar

Physical Review A / Oct 01, 1978

Bellum, J. C., & Micha, D. A. (1978). Coupling of discrete and continuum electronic states in atom-atom collisions: A coupled-channels investigation of Penning ionization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mi>s</mml:mi><mml:mn>2</mml:mn><mml:mi>s</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow><mml:mo>)</mml:mo></mml:math>+ Ar. Physical Review A, 18(4), 1435–1447. https://doi.org/10.1103/physreva.18.1435

Collisional ionization in the presence of intense laser radiation: Quantum-mechanical calculations for He* (3S)+Ar±h/ω→He+Ar+(2P)+e

The Journal of Chemical Physics / Jun 01, 1979

Bellum, J. C., & George, T. F. (1979). Collisional ionization in the presence of intense laser radiation: Quantum-mechanical calculations for He* (3S)+Ar±h/ω→He+Ar+(2P)+e−. The Journal of Chemical Physics, 70(11), 5059–5071. https://doi.org/10.1063/1.437348

The treatment of correlation effects in second-order properties

International Journal of Quantum Chemistry / Jun 18, 2009

Bartlett, R. J., Bellum, J. C., & Brändas, E. J. (2009). The treatment of correlation effects in second-order properties. International Journal of Quantum Chemistry, 7(S7), 449–462. https://doi.org/10.1002/qua.560070753

Production of Optical Coatings Resistant to Damage by Petawatt Class Laser Pulses

Lasers - Applications in Science and Industry / Dec 09, 2011

Bellum, J., Rambo, P., Schwarz, J., Smith, I., Kimmel, M., Kletecka, D., & Atherto, B. (2011). Production of Optical Coatings Resistant to Damage by Petawatt Class Laser Pulses. In Lasers - Applications in Science and Industry. InTech. https://doi.org/10.5772/24285

Low Group Delay Dispersion Optical Coating for Broad Bandwidth High Reflection at 45° Incidence, P Polarization of Femtosecond Pulses with 900 nm Center Wavelength

Coatings / Mar 09, 2016

Bellum, J., Field, E., Winstone, T., & Kletecka, D. (2016). Low Group Delay Dispersion Optical Coating for Broad Bandwidth High Reflection at 45° Incidence, P Polarization of Femtosecond Pulses with 900 nm Center Wavelength. Coatings, 6(1), 11. https://doi.org/10.3390/coatings6010011

Reactive, Ion-Assisted Deposition of E-Beam Evaporated Ti for High Refractive Index TiO2 Layers and Laser Damage Resistant, Broad Bandwidth, High Reflection Coatings

Optical Interference Coatings / Jan 01, 2013

Bellum, J., Field, E., Kletecka, D., & Long, F. (2013). Reactive, Ion-Assisted Deposition of E-Beam Evaporated Ti for High Refractive Index TiO2 Layers and Laser Damage Resistant, Broad Bandwidth, High Reflection Coatings. Optical Interference Coatings. https://doi.org/10.1364/oic.2013.fa.7

Penning ionization of Ar by He* (1s2s, 3S) in the presence of intense laser radiation: Pronounced laser-modified collisional effects in the emitted-electron energy spectrum

The Journal of Chemical Physics / Aug 15, 1978

Bellum, J. C., Lam, K.-S., & George, T. F. (1978). Penning ionization of Ar by He* (1s2s, 3S) in the presence of intense laser radiation: Pronounced laser-modified collisional effects in the emitted-electron energy spectrum. The Journal of Chemical Physics, 69(4), 1781–1783. https://doi.org/10.1063/1.436714

Design and laser damage properties of a dichroic beam combiner coating for 22.5-deg incidence and S polarization with high transmission at 527 nm and high reflection at 1054 nm

Optical Engineering / Oct 12, 2016

Bellum, J. C., Field, E. S., Kletecka, D. E., Rambo, P. K., & Smith, I. C. (2016). Design and laser damage properties of a dichroic beam combiner coating for 22.5-deg incidence and S polarization with high transmission at 527 nm and high reflection at 1054 nm. Optical Engineering, 56(1), 011020. https://doi.org/10.1117/1.oe.56.1.011020

Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods

Optical Engineering / Jul 08, 2016

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2016). Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods. Optical Engineering, 56(1), 011002. https://doi.org/10.1117/1.oe.56.1.011002

Optical damage testing at the Z-Backlighter facility at Sandia National Laboratories

SPIE Proceedings / Oct 07, 2009

Kimmel, M., Rambo, P., Broyles, R., Geissel, M., Schwarz, J., Bellum, J., & Atherton, B. (2009). Optical damage testing at the Z-Backlighter facility at Sandia National Laboratories. In G. J. Exarhos, V. E. Gruzdev, D. Ristau, M. J. Soileau, & C. J. Stolz (Eds.), Laser-Induced Damage in Optical Materials: 2009. SPIE. https://doi.org/10.1117/12.836917

Analysis of laser damage tests on coatings designed for broad bandwidth high reflection of femtosecond pulses

Optical Engineering / Aug 25, 2016

Bellum, J., Winstone, T., Lamaignere, L., Sozet, M., Kimmel, M., Rambo, P., Field, E., & Kletecka, D. (2016). Analysis of laser damage tests on coatings designed for broad bandwidth high reflection of femtosecond pulses. Optical Engineering, 56(1), 011012. https://doi.org/10.1117/1.oe.56.1.011012

How reduced vacuum pumping capability in a coating chamber affects the laser damage resistance of HfO2/SiO2antireflection and high-reflection coatings

Optical Engineering / Jul 15, 2016

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2016). How reduced vacuum pumping capability in a coating chamber affects the laser damage resistance of HfO2/SiO2antireflection and high-reflection coatings. Optical Engineering, 56(1), 011005. https://doi.org/10.1117/1.oe.56.1.011005

Diatomic molecular-orbital correlation diagrams for Penning and associative ionization

Physical Review A / Feb 01, 1977

Bellum, J. C., & Micha, D. A. (1977). Diatomic molecular-orbital correlation diagrams for Penning and associative ionization. Physical Review A, 15(2), 635–646. https://doi.org/10.1103/physreva.15.635

Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO2, Nb2O5, or Ta2O5high-index layers

Optical Engineering / Sep 21, 2016

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2016). Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO2, Nb2O5, or Ta2O5high-index layers. Optical Engineering, 56(1), 011018. https://doi.org/10.1117/1.oe.56.1.011018

Experimental investigation of phase conjugation in stimulated Brillouin scattering of beams with mild cylindrical aberration

Optics Letters / Jan 01, 1988

Bellum, J. C., Crow, T. G., & Camp, E. L. (1988). Experimental investigation of phase conjugation in stimulated Brillouin scattering of beams with mild cylindrical aberration. Optics Letters, 13(1), 36. https://doi.org/10.1364/ol.13.000036

Tools for Improving Precision Optical Coatings through E-Beam Sweep Design

Optical Interference Coatings / Jan 01, 2007

Gevelber, M., Xu, B., & Reimann, G. (2007). Tools for Improving Precision Optical Coatings through E-Beam Sweep Design. Optical Interference Coatings. https://doi.org/10.1364/oic.2007.tucpdp1

Broad bandwidth high reflection coatings for petawatt class lasers: femtosecond pulse laser damage tests, and measurement of group delay dispersion

SPIE Proceedings / Feb 23, 2017

Bellum, J. C., Winstone, T. B., Field, E. S., & Kletecka, D. E. (2017). Broad bandwidth high reflection coatings for petawatt class lasers: femtosecond pulse laser damage tests, and measurement of group delay dispersion. In A. A. S. Awwal (Ed.), High Power Lasers for Fusion Research IV. SPIE. https://doi.org/10.1117/12.2267809

Laser damage, a new US standard: What is in it for me?

Components and Packaging for Laser Systems VI / Feb 21, 2020

Howland, D. J., Arenberg, J., Thomas, M. D., Turner, T., Bellum, J., Carr, C. W., Brophy, M., Krisiloff, A., Carlie, N., & Dabney, M. (2020). Laser damage, a new US standard: What is in it for me? In A. L. Glebov & P. O. Leisher (Eds.), Components and Packaging for Laser Systems VI. SPIE. https://doi.org/10.1117/12.2546571

The Effect of Coating System Base Pressure on the Laser Damage Threshold of HfO2/SiO2 High Reflection Coatings for 527 nm

Optical Interference Coatings 2016 / Jan 01, 2016

Field, E. S., Bellum, J., & Kletecka, D. (2016). The Effect of Coating System Base Pressure on the Laser Damage Threshold of HfO2/SiO2 High Reflection Coatings for 527 nm. Optical Interference Coatings 2016. https://doi.org/10.1364/oic.2016.wd.3

Quantum-mechanical theory for electronic-vibrational-rotational energy transfer in atom–diatom collisions: Analysis of the Hamiltonian

The Journal of Chemical Physics / Jul 15, 1983

Bellum, J. C., & McGuire, P. (1983). Quantum-mechanical theory for electronic-vibrational-rotational energy transfer in atom–diatom collisions: Analysis of the Hamiltonian. The Journal of Chemical Physics, 79(2), 765–776. https://doi.org/10.1063/1.445827

U.S. National Committee proposed revision to the ISO Laser Damage Standard

Laser-Induced Damage in Optical Materials 2017 / Nov 21, 2017

Howland, D. J., Arenberg, J. W., Thomas, M. D., Krisiloff, A., Turner, T., Field, E., Brophy, M., Shaffer, G., Bellum, J. C., & Carr, C. W. (2017). U.S. National Committee proposed revision to the ISO Laser Damage Standard. In G. J. Exarhos, D. Ristau, V. E. Gruzdev, J. A. Menapace, & M. Soileau (Eds.), Laser-Induced Damage in Optical Materials 2017. SPIE. https://doi.org/10.1117/12.2280559

Analysis of VUV and soft x‐ray lasing based on charge‐exchange mechanisms

AIP Conference Proceedings / Jan 01, 1982

Bellum, J. C., Chow, W. W., Drühl, K., & Scully, M. O. (1982). Analysis of VUV and soft x‐ray lasing based on charge‐exchange mechanisms. AIP Conference Proceedings. https://doi.org/10.1063/1.33759

Coatings for Petawatt-Class High-Energy Lasers

Optics and Photonics News / Jun 01, 2022

Bellum, J. (2022). Coatings for Petawatt-Class High-Energy Lasers. Optics and Photonics News, 33(6), 28. https://doi.org/10.1364/opn.33.6.000028

Experiments in support of the proposed US National Damage Standard

Laser-Induced Damage in Optical Materials 2021 / Oct 12, 2021

Arenberg, J., Thomas, M., Howland, D., & Bellum, J. (2021). Experiments in support of the proposed US National Damage Standard. In V. E. Gruzdev, C. W. Carr, D. Ristau, & C. S. Menoni (Eds.), Laser-Induced Damage in Optical Materials 2021. SPIE. https://doi.org/10.1117/12.2598814

Development of US national laser damage standard: 2020 status

Laser-induced Damage in Optical Materials 2020 / Sep 15, 2020

Arenberg, J. W., Howland, D., Thomas, M., Bellum, J. C., & Dabney, M. S. (2020). Development of US national laser damage standard: 2020 status. In V. E. Gruzdev, C. W. Carr, D. Ristau, & C. S. Menoni (Eds.), Laser-induced Damage in Optical Materials 2020. SPIE. https://doi.org/10.1117/12.2571877

U.S. National Committee proposed revision to the ISO Laser Damage Standard: 2019 progress report (Conference Presentation)

Laser-induced Damage in Optical Materials 2019 / Dec 03, 2019

Howland, D. J., Arenberg, J. W., Thomas, M. D., Turner, T., Bellum, J., Field, E. S., Carr, C. W., Shaffer, G., Brophy, M., & Krisiloff, A. (2019). U.S. National Committee proposed revision to the ISO Laser Damage Standard: 2019 progress report (Conference Presentation). In V. E. Gruzdev, C. W. Carr, D. Ristau, & C. S. Menoni (Eds.), Laser-induced Damage in Optical Materials 2019. SPIE. https://doi.org/10.1117/12.2536446

Acknowledgement to Reviewers of Coatings in 2016

Coatings / Jan 10, 2017

(2017). Acknowledgement to Reviewers of Coatings in 2016. Coatings, 7(1), 6. https://doi.org/10.3390/coatings7010006

Summary Report: NMSBA CY 2016 - AEgis Technologies Group Inc. #12458.

Dec 01, 2016

Bellum, J., & Field, E. (2016). Summary Report: NMSBA CY 2016 - AEgis Technologies Group Inc. #12458. Office of Scientific and Technical Information (OSTI). https://doi.org/10.2172/1335061

Photonics at TVI Community College – a critical rung in New Mexico’s photonics education ladder

Education and Training in Optics and Photonics / Jan 01, 2003

Bellum, J., Vasan, S., & Gellman, J. (2003). Photonics at TVI Community College – a critical rung in New Mexico’s photonics education ladder. Education and Training in Optics and Photonics. https://doi.org/10.1364/etop.2003.eme2

Study of Molecular Collision Dynamics for Chemical Laser Systems.

Mar 01, 1982

Bellum, J. C., & Burrows, M. (1982). Study of Molecular Collision Dynamics for Chemical Laser Systems. Defense Technical Information Center. https://doi.org/10.21236/ada117938

Laser-Enhanced Dynamics in Molecular Rate Processes

Radiation Energy Conversion in Space / Jan 01, 1978

Laser-Enhanced Dynamics in Molecular Rate Processes. (1978). In Radiation Energy Conversion in Space (pp. 583–592). American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/5.9781600865350.0583.0592

Effectiveness of ion cleaning to improve the laser damage threshold of HfO2/SiO2optical coatings for high reflection and antireflection at 527 nm and 1054 nm

SPIE Proceedings / Jul 22, 2016

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2016). Effectiveness of ion cleaning to improve the laser damage threshold of HfO2/SiO2optical coatings for high reflection and antireflection at 527 nm and 1054 nm. In T. Jitsuno, J. Shao, & W. Rudolph (Eds.), Pacific Rim Laser Damage 2016: Optical Materials for High-Power Lasers. SPIE. https://doi.org/10.1117/12.2235689

Use of Al2O3 layers for higher laser damage threshold at 22.5° incidence, S polarization of a 527 nm/1054 nm dichroic coating

SPIE Proceedings / Dec 06, 2016

Bellum, J. C., Field, E. S., Kletecka, D. E., Rambo, P. K., & Smith, I. C. (2016). Use of Al2O3 layers for higher laser damage threshold at 22.5° incidence, S polarization of a 527 nm/1054 nm dichroic coating. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), Laser-Induced Damage in Optical Materials 2016. SPIE. https://doi.org/10.1117/12.2257607

Analysis of laser damage tests on a coating for broad bandwidth high reflection of femtosecond pulses

Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers / Jul 14, 2015

Bellum, J., Winstone, T., Lamaignere, L., Sozet, M., Kimmel, M., Rambo, P., Field, E., & Kletecka, D. (2015). Analysis of laser damage tests on a coating for broad bandwidth high reflection of femtosecond pulses. In J. Shao, T. Jitsuno, W. Rudolph, & M. Zhu (Eds.), SPIE Proceedings. SPIE. https://doi.org/10.1117/12.2186789

Comparative STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage) studies of critical defect distributions in IBS, ALD, and electron-beam coated dielectric films

Laser-Induced Damage in Optical Materials: 2015 / Nov 23, 2015

Xu, Y., Khabbazi, A., Day, T., Brown, A., Emmert, L. A., Talghader, J. J., Field, E., Kletecka, D., Bellum, J., Patel, D., Menoni, C. S., & Rudolph, W. (2015). Comparative STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage) studies of critical defect distributions in IBS, ALD, and electron-beam coated dielectric films. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), SPIE Proceedings. SPIE. https://doi.org/10.1117/12.2196548

Design and laser damage properties of a dichroic beam combiner coating for 22.5° incidence and S polarization with high-transmission at 527nm and high-reflection at 1054nm

Laser-Induced Damage in Optical Materials: 2015 / Nov 23, 2015

Bellum, J. C., Field, E. S., Kletecka, D. E., Rambo, P. K., & Smith, I. C. (2015). Design and laser damage properties of a dichroic beam combiner coating for 22.5° incidence and S polarization with high-transmission at 527nm and high-reflection at 1054nm. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), SPIE Proceedings. SPIE. https://doi.org/10.1117/12.2218166

How laser damage resistance of HfO2/SiO2optical coatings is affected by embedded contamination caused by pausing the deposition process

Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers / Jul 10, 2015

Field, E., Bellum, J., & Kletecka, D. (2015). How laser damage resistance of HfO2/SiO2optical coatings is affected by embedded contamination caused by pausing the deposition process. In J. Shao, T. Jitsuno, W. Rudolph, & M. Zhu (Eds.), SPIE Proceedings. SPIE. https://doi.org/10.1117/12.2185739

How reduced vacuum pumping capability in a coating chamber affects the laser damage resistance of HfO2/SiO2antireflection and high-reflection coatings

Laser-Induced Damage in Optical Materials: 2015 / Nov 23, 2015

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2015). How reduced vacuum pumping capability in a coating chamber affects the laser damage resistance of HfO2/SiO2antireflection and high-reflection coatings. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), SPIE Proceedings. SPIE. https://doi.org/10.1117/12.2194131

Repair of a mirror coating on a large optic for high laser-damage applications using ion milling and over-coating methods

SPIE Proceedings / Oct 31, 2014

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2014). Repair of a mirror coating on a large optic for high laser-damage applications using ion milling and over-coating methods. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), Laser-Induced Damage in Optical Materials: 2014. SPIE. https://doi.org/10.1117/12.2067920

The impact of different cleaning processes on the laser damage threshold of antireflection coatings for Z-Backlighter optics at Sandia National Laboratories

SPIE Proceedings / Sep 22, 2014

Field, E., Bellum, J., & Kletecka, D. (2014). The impact of different cleaning processes on the laser damage threshold of antireflection coatings for Z-Backlighter optics at Sandia National Laboratories. In T. Jitsuno, J. Shao, & W. Rudolph (Eds.), Pacific Rim Laser Damage 2014: Optical Materials for High-Power Lasers. SPIE. https://doi.org/10.1117/12.2073448

Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO2, Nb2O5, or Ta2O5high index layers

SPIE Proceedings / Nov 14, 2013

Field, E. S., Bellum, J. C., & Kletecka, D. E. (2013). Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO2, Nb2O5, or Ta2O5high index layers. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. Soileau (Eds.), Laser-Induced Damage in Optical Materials: 2013. SPIE. https://doi.org/10.1117/12.2030068

Comparisons between laser damage and optical electric field behaviors for hafnia/silica antireflection coatings

Applied Optics / Feb 01, 2011

Bellum, J., Kletecka, D., Rambo, P., Smith, I., Schwarz, J., & Atherton, B. (2011). Comparisons between laser damage and optical electric field behaviors for hafnia/silica antireflection coatings. Applied Optics, 50(9), C340. https://doi.org/10.1364/ao.50.00c340

Z-Backlighter facility upgrades: a path to short/long pulse, multi-frame, multi-color x-ray backlighting at the Z-Accelerator

SPIE Proceedings / May 05, 2011

Schwarz, J., Rambo, P., Geissel, M., Kimmel, M., Schollmeier, M., Smith, I., Bellum, J., Kletecka, D., Sefkow, A., Smith, D., & Atherton, B. (2011). Z-Backlighter facility upgrades: a path to short/long pulse, multi-frame, multi-color x-ray backlighting at the Z-Accelerator. In J. Hein, L. O. Silva, G. Korn, L. A. Gizzi, & C. Edwards (Eds.), Diode-Pumped High Energy and High Power Lasers; ELI: Ultrarelativistic Laser-Matter Interactions and Petawatt Photonics; and HiPER: the European Pathway to Laser Energy. SPIE. https://doi.org/10.1117/12.887114

Dual wavelength laser damage testing for high energy lasers

SPIE Proceedings / Oct 13, 2010

Kimmel, M., Rambo, P., Schwarz, J., Bellum, J. C., & Atherton, B. (2010). Dual wavelength laser damage testing for high energy lasers. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. J. Soileau (Eds.), Laser-Induced Damage in Optical Materials: 2010. SPIE. https://doi.org/10.1117/12.867743

Laser damage by ns and sub-ps pulses on hafnia/silica anti-reflection coatings on fused silica double-sided polished using zirconia or ceria and washed with or without an alumina wash step

SPIE Proceedings / Oct 13, 2010

Bellum, J., Kletecka, D., Kimmel, M., Rambo, P., Smith, I., Schwarz, J., Atherton, B., Hobbs, Z., & Smith, D. (2010). Laser damage by ns and sub-ps pulses on hafnia/silica anti-reflection coatings on fused silica double-sided polished using zirconia or ceria and washed with or without an alumina wash step. In G. J. Exarhos, V. E. Gruzdev, J. A. Menapace, D. Ristau, & M. J. Soileau (Eds.), Laser-Induced Damage in Optical Materials: 2010. SPIE. https://doi.org/10.1117/12.868350

Nanosecond 1064nm damage thresholds for bare and anti-reflection coated silica surfaces

Laser-Induced Damage in Optical Materials: 2008 / Oct 08, 2008

Smith, A. V., Do, B. T., Bellum, J., Schuster, R., & Collier, D. (2008). Nanosecond 1064nm damage thresholds for bare and anti-reflection coated silica surfaces. In G. J. Exarhos, D. Ristau, M. J. Soileau, & C. J. Stolz (Eds.), SPIE Proceedings. SPIE. https://doi.org/10.1117/12.804130

Photonics at TVI Community College: a critical rung in New Mexico's photonics education ladder

SPIE Proceedings / Oct 09, 2003

Bellum, J., Vasan, S., & Gellman, J. (2003). Photonics at TVI Community College: a critical rung in New Mexico’s photonics education ladder. In B. L. Shoop & G. Swartzlander (Eds.), Eighth International Topical Meeting on Education and Training in Optics and Photonics. SPIE. https://doi.org/10.1117/12.2208377

A semiclassical approach to collisional ionization with application to the ArHe system

Chemical Physics / Sep 01, 1978

Lam, K.-S., Bellum, J. C., & George, T. F. (1978). A semiclassical approach to collisional ionization with application to the ArHe system. Chemical Physics, 33(2), 219–226. https://doi.org/10.1016/0301-0104(78)87131-6

A study of single-electron and total energies for some pairs of noble gas atoms

International Journal of Quantum Chemistry / Jun 18, 2009

Bellum, J. C., & Micha, D. A. (2009). A study of single-electron and total energies for some pairs of noble gas atoms. International Journal of Quantum Chemistry, 8(S8), 229–240. https://doi.org/10.1002/qua.560080827

The electronic spectra of conjugated free radicals

Molecular Physics / Sep 01, 1973

Jørgensen, P., & Bellum, J. (1973). The electronic spectra of conjugated free radicals. Molecular Physics, 26(3), 725–734. https://doi.org/10.1080/00268977300102041

Education

University of Florida

PhD, Department of Physics / August, 1976

Gainesville, Florida, United States of America

Georgia Institute of Technology

BS, Department of Physics / June, 1968

Atlanta, Georgia, United States of America

Experience

Coherent Technologies

Consultant / February, 2017Present

I am a consultant specializing in laser damage resistant optical coatings for high energy lasers.

Sandia National Laboratories

Scientist and Engineer in Optical Engineering / September, 2012February, 2017

Lead optical engineer/scientist for Sandia's large optics coating facility responsible for the design and production of high laser-induced damage threshold optical coatings for the meter-size windows, mirrors, and lenses of Sandia's Z-Backlighter petawatt-class lasers.

Sandia National Laboratories

Optical Engineer and Scientist under contract to Sandia National Laboratories / April, 2004September, 2012

Lead optical engineer/scientist for Sandia's large optics coating facility responsible for the design and production of high laser-induced damage threshold optical coatings for the meter-size windows, mirrors, and lenses of Sandia's Z-Backlighter petawatt-class lasers.

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