Dr. John C. Bellum
Semi-Retired Consultant at Coherent Technologies
SPIE Involvement:
Area of Expertise:
optical thin film coating design , high laser damage threshold optical coatings , optical thin film coating process control , optical thin film coating production
Profile Summary

For nearly 13 years, until February 2017, I led the large optics coating operation at Sandia National Laboratories in support of the high energy lasers of Sandia's Z-Backlighter Laser Facility. I had responsibility for design, analysis, deposition and metrology of optical coatings for the large, meter-class Z-Backlighter laser optics in keeping with their stringent requirements of resistance to high power laser damage. I have extensive work experience in optical science and engineering and related areas of science and physics, and in the design and analysis of high laser damage threshold optical thin film coatings for various applications such as high reflection, anti-reflection, dichroic beam splitting, polarization discrimination and multi-layer dielectric gratings. My early scientific background is in theoretical molecular physics, and I am interested in laser damage mechanisms and associated electronic structure of optical media. Currently I am a consultant in optical coatings.
Publications (28)

Proceedings Article | 21 February 2020
Proc. SPIE. 11261, Components and Packaging for Laser Systems VI
KEYWORDS: Statistical analysis, Laser induced damage, Laser development, Optical testing, Electro optics, Laser optics, Optics manufacturing, National Ignition Facility, Standards development

Proceedings Article | 3 December 2019
Proc. SPIE. 11173, Laser-induced Damage in Optical Materials 2019
KEYWORDS: Laser induced damage, Gas lasers, Carbon monoxide, Standards development

Proceedings Article | 21 November 2017
Proc. SPIE. 10447, Laser-Induced Damage in Optical Materials 2017
KEYWORDS: Aerospace engineering, Laser induced damage, Laser marking, Gas lasers, Electro optics, Product engineering, Optics manufacturing, Binary data, Standards development

Proceedings Article | 23 February 2017
Proc. SPIE. 10084, High Power Lasers for Fusion Research IV
KEYWORDS: Femtosecond phenomena, Reflection, Laser induced damage, Optical coatings, Raster graphics, Laser damage threshold, Hybrid fiber optics, Pulsed laser operation, Environmental sensing, High reflection coatings

Proceedings Article | 6 December 2016
Proc. SPIE. 10014, Laser-Induced Damage in Optical Materials 2016
KEYWORDS: Optical amplifiers, Glasses, Laser energy, X-rays, Optical coatings, Diagnostics, X-ray imaging, Laser beam diagnostics, Pulsed laser operation, Fusion energy

Showing 5 of 28 publications
Conference Committee Involvement (3)
International Conference on Metallurgical Coatings and Thin Films
26 April 2010 |
International Conference on Metallurgical Coatings and Thin Films
27 April 2009 |
International Conference on Metallurgical Coatings and Thin Films
28 April 2008 |
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