Dr. Henry Helvajian Profile

Dr. Henry Helvajian

Technical Fellow/Principal Scientist at The Aerospace Corp.

SPIE Involvement:

Conference Co-Chair | Track Chair | Editor | Author

Publications (32)

SPIE Press Book | 22 June 2023

The Nanosatellite Revolution: 30 Years and Continuing

KEYWORDS: Satellites, Space operations, Design and modelling, Antennas, Receivers, Sensors, Sun, Aerospace engineering, Ions, Satellite communications

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The Nanosatellite Revolution: 30 Years and Continuing

Proceedings Article | 17 March 2023 Presentation

Advanced manufacturing technologies for future operations in outer space: what we have and what we need

Henry Helvajian

Proceedings Volume PC12412, PC124120C (2023) https://doi.org/10.1117/12.2661371

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Proceedings Article | 3 October 2022 Presentation

Laser based cleaning and in-situ verification of bio-loading for planetary protection (Conference Presentation)

Andrew Robbins, Sean Jergensen, Meg Abraham, Henry Helvajian

Proceedings Volume 12224, 122240U (2022) https://doi.org/10.1117/12.2636318

KEYWORDS: Microorganisms, Ultraviolet radiation, Luminescence, Ultraviolet detectors, Spectroscopy, Space operations, Pulsed laser operation, Planetary science, Infrared spectroscopy, Infrared imaging

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Proceedings Article | 1 April 2022 Presentation

Laser speckle-based sensor for surface measurements in smart manufacturing of AM parts

Anthony Manzo, Edgar Olivares-Manas, Richard Donovan, Guann-pyng Li, Yoon Kim, Marilee Wheaton, Henry Helvajian

Proceedings Volume PC11992, PC119920G (2022) https://doi.org/10.1117/12.2614087

KEYWORDS: Speckle, Sensors, Manufacturing

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Proceedings Article | 1 August 2021 Presentation + Paper

A novel large area fan-shaped lidar sensor for space debris: laboratory demonstration and model validation

Matthew Kelley, Shawn Perdue, Henry Helvajian, John McVey, Glenn Peterson, Marlon Sorge

Proceedings Volume 11832, 1183209 (2021) https://doi.org/10.1117/12.2595557

KEYWORDS: Particles, Sensors, LIDAR, Fluctuations and noise, Transmitters, Receivers, Pulsed laser operation, Satellites, Foam, Signal to noise ratio

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SPIE Journal Paper | 2 May 2018 Open Access

Utility of optical heterodyne displacement sensing and laser ultrasonics as in situ process control diagnostic for additive manufacturing

Anthony Manzo, Henry Helvajian

OE, Vol. 57, Issue 04, 041415, (May 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.4.041415

KEYWORDS: Diagnostics, Sensors, Laser beam diagnostics, Heterodyning, Pulsed laser operation, Process control, Ultrasonics, Surface roughness, Optical sensing, Temperature metrology

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SPIE Journal Paper | 2 May 2018 Open Access

Special Section Guest Editorial: 3-D Printing and Manufacturing

Henry Helvajian, Bo Gu

OE, Vol. 57, Issue 04, 041401, (May 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.4.041401

KEYWORDS: 3D printing, Printing, Manufacturing, Additive manufacturing, Optical engineering, Sensors, Optics manufacturing, Photonics, Diagnostics, Patents

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Proceedings Article | 14 March 2018 Presentation

Possible application of laser heterodyne and ultrasonics as in situ process control for additive manufacturing (Conference Presentation)

Anthony Manzo, Henry Helvajian

Proceedings Volume 10523, 1052314 (2018) https://doi.org/10.1117/12.2296437

KEYWORDS: Pulsed laser operation, Heterodyning, Process control, Ultrasonics, Additive manufacturing, Laser interferometry, Interferometry, Continuous wave operation, Time metrology, Temperature metrology

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Proceedings Article | 16 February 2018 Presentation + Paper

Controlling properties of few-layer MoS2 with a multi-laser process scheme

J. Wuenschell, J. Lince, A. Payton, H. Helvajian

Proceedings Volume 10519, 105190L (2018) https://doi.org/10.1117/12.2291060

KEYWORDS: Thin films, Laser processing, Crystals, Laser crystals, Modulation, Continuous wave operation, Pulsed laser operation, Molybdenum, Graphene, Gold

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Proceedings Article | 6 April 2016 Paper

Laser post-processing of Inconel 625 made by selective laser melting

David Witkin, Henry Helvajian, Lee Steffeney, William Hansen

Proceedings Volume 9738, 97380W (2016) https://doi.org/10.1117/12.2213745

KEYWORDS: Surface roughness, Spatial light modulators, Laser processing, Surface finishing, Amplitude modulation, Polishing, Additive manufacturing, Modulation, Pulsed laser operation, Oxides, Continuous wave operation

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Proceedings Article | 6 April 2016 Paper

Application of laser ultrasonic non-destructive evaluation technique to additive manufacturing

Anthony Manzo, Shant Kenderian, Henry Helvajian

Proceedings Volume 9738, 973810 (2016) https://doi.org/10.1117/12.2219866

KEYWORDS: Ultrasonics, Sensors, Wave plates, Pulsed laser operation, Additive manufacturing, Nondestructive evaluation, Heterodyning, Diagnostics, Laser beam diagnostics, Wave propagation

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Proceedings Article | 8 March 2014 Paper

Application of a laser heterodyne technique to characterize surface acoustic waves generated via a pulsed laser excitation

Anthony Manzo, Henry Helvajian

Proceedings Volume 8967, 89670N (2014) https://doi.org/10.1117/12.2041211

KEYWORDS: Pulsed laser operation, Heterodyning, Acoustics, Wave propagation, Silicon, Data acquisition, Laser spectroscopy, Spectroscopy, Laser development, Demodulation

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Proceedings Article | 8 March 2014 Paper

Demonstration of enhanced surface mobility of adsorbate cluster species by surface acoustic wave excitation induced by a pulsed laser

Anthony Manzo, H. Helvajian

Proceedings Volume 8969, 896908 (2014) https://doi.org/10.1117/12.2041218

KEYWORDS: Pulsed laser operation, Gold, Heterodyning, Silicon, Cameras, Luminescence, Acoustics, Molecules, Semiconductor lasers, Microscopes

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Proceedings Article | 17 March 2008 Paper

Laser alteration of the mechanical properties of photostructurable glass-ceramic

J. Stillman, J. Judy, H. Helvajian

Proceedings Volume 6879, 68790E (2008) https://doi.org/10.1117/12.761867

KEYWORDS: Crystals, Acoustics, Velocity measurements, Glasses, Etching, Laser crystals, Nondestructive evaluation, Ultrasonics, Composites, Microelectromechanical systems

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Proceedings Article | 26 February 2008 Paper

Aspect ratios, sizes, and etch rates in photostructurable glass-ceramic

J. Stillman, J. Judy, H. Helvajian

Proceedings Volume 6882, 68820J (2008) https://doi.org/10.1117/12.761895

KEYWORDS: Etching, Semiconducting wafers, Crystals, Glasses, Laser crystals, Profilometers, Distance measurement, Optical lithography, Lithium, Ultrasonics

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Proceedings Article | 7 March 2007 Paper

Processing parameters for the development of glass/ceramic MEMS

J. Stillman, J. Judy, H. Helvajian

Proceedings Volume 6462, 64620A (2007) https://doi.org/10.1117/12.700911

KEYWORDS: Etching, Optical lithography, Semiconducting wafers, Crystals, Glasses, Microelectromechanical systems, Pulsed laser operation, 3D modeling, Manufacturing, Lithium

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Proceedings Article | 8 October 2004 Paper

Laser direct write for release of SiO2 MEMS and nano-scale devices

Margaret Abraham, Henry Helvajian

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596553

KEYWORDS: Oxides, Silicon, Microelectromechanical systems, Etching, Semiconducting wafers, Wet etching, Chemical lasers, Semiconductor lasers, Oxygen, Silica

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Proceedings Article | 8 October 2004 Paper

Active photo-physical processes in the pulsed UV nanosecond laser exposure of photostructurable glass ceramic materials

Frank Livingston, Paul Adams, Henry Helvajian

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.595791

KEYWORDS: Ultraviolet radiation, Glasses, Ceramics, Pulsed laser operation, Spectroscopy, Materials processing, Transmittance, Optical spectroscopy, Microfabrication, Laser irradiation

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Proceedings Article | 19 February 2003 Paper

True 3D volumetric patterning of photostructurable glass using UV laser irradiation and variable exposure processing: fabrication of meso-scale devices

Frank Livingston, Henry Helvajian

Proceedings Volume 4830, (2003) https://doi.org/10.1117/12.486588

KEYWORDS: Glasses, Laser processing, Etching, Wet etching, Ultraviolet radiation, Optical lithography, Ceramics, Optical filters, Laser irradiation, Computer aided design

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Proceedings Article | 13 September 2002 Paper

Reduction in ignition energy for single-shot microthrusters using pulsed-laser excitation

William Hansen, Siegfried Janson, Henry Helvajian

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482144

KEYWORDS: Satellites, Pulsed laser operation, Lead, Laser energy, Semiconducting wafers, Glasses, Aerospace engineering, Nd:YAG lasers, Space operations, Bridges

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Proceedings Article | 18 June 2002 Paper

Effect of laser parameters on the exposure and selective etch rate in photostructurable glass

Frank Livingston, William Hansen, Adam Huang, Henry Helvajian

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470631

KEYWORDS: Etching, Glasses, Laser processing, Ultraviolet radiation, Optical lithography, Microelectromechanical systems, Pulsed laser operation, Crystals, Photography, Semiconducting wafers

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Proceedings Article | 18 June 2002 Paper

Development of a 100-gm-class inspector satellite using photostructurable glass/ceramic materials

Adam Huang, William Hansen, Siegfried Janson, Henry Helvajian

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470636

KEYWORDS: Semiconducting wafers, Satellites, Control systems, Wet etching, Ultraviolet radiation, Optical lithography, Space operations, Microelectromechanical systems, Inspection, Glasses

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Proceedings Article | 1 October 2001 Paper

Microengineered cold gas thruster system for a co-orbiting satellite assistant (COSA)

Adam Huang, William Hansen, Siegfried Janson, Henry Helvajian

Proceedings Volume 4559, (2001) https://doi.org/10.1117/12.443032

KEYWORDS: Space operations, Microelectromechanical systems, Satellites, Aerospace engineering, Computer aided design, Glasses, Electronics, Semiconducting wafers, Silver, Etching

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Proceedings Article | 6 November 2000 Paper

Nanosatellites and MEMS fabrication by laser microprocessing

Henry Helvajian, Peter Fuqua, William Hansen, Siegfried Janson

Proceedings Volume 4088, (2000) https://doi.org/10.1117/12.405723

KEYWORDS: Aerospace engineering, Laser processing, Glasses, Laser development, Microfabrication, Ceramics, Semiconducting wafers, Crystals, Fabrication, Etching

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Proceedings Article | 15 July 1999 Paper

Laser-induced nonthermal surface modification of aluminum

David Taylor, Henry Helvajian

Proceedings Volume 3618, (1999) https://doi.org/10.1117/12.352682

KEYWORDS: Ions, Aluminum, Ionization, Surface finishing, Scanning electron microscopy, Crystals, Laser processing, Polishing, Chemical species, Laser applications

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Proceedings Article | 15 July 1999 Paper

Fabrication of true 3D microstructures in glass/ceramic materials by pulsed UV laser volumetric exposure techniques

Peter Fuqua, Siegfried Janson, William Hansen, Henry Helvajian

Proceedings Volume 3618, (1999) https://doi.org/10.1117/12.352714

KEYWORDS: Satellites, Fabrication, 3D microstructuring, Ultraviolet radiation, Glasses, Silicon, Aerospace engineering, Semiconducting wafers, Silver, Pulsed laser operation

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Proceedings Article | 3 June 1998 Paper

Nonlinear photon-stimulated desorption from an oxidized tungsten surface

David Taylor, Henry Helvajian

Proceedings Volume 3274, (1998) https://doi.org/10.1117/12.309519

KEYWORDS: Tungsten, Oxygen, Ions, Oxides, Metals, Laser energy, Laser irradiation, Adsorption, Chemical species, Physics

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Proceedings Article | 29 July 1997 Paper

Big benefits from tiny technologies: micro-nanotechnology applications in future space systems

H. Helvajian, Siegfried Janson, E. Robinson

Proceedings Volume 10288, 1028802 (1997) https://doi.org/10.1117/12.278749

KEYWORDS: Microelectromechanical systems, Microopto electromechanical systems, Nanoelectronics, Silicon, Satellites

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Proceedings Article | 9 May 1997 Paper

Direct-write UV-laser microfabrication of 3D structures in lithium-aluminosilicate glass

William Hansen, Siegfried Janson, Henry Helvajian

Proceedings Volume 2991, (1997) https://doi.org/10.1117/12.273716

KEYWORDS: Etching, Glasses, Ultraviolet radiation, Space operations, Aerospace engineering, Optical lithography, Telecommunications, Manufacturing, Satellites, Satellite communications

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Proceedings Article | 8 April 1996 Paper

UV FEL light source for industrial processing

Michael Kelley, H. Frederick Dylla, George Neil, Leonard Brillson, Daniel Henkel, Henry Helvajian

Proceedings Volume 2703, (1996) https://doi.org/10.1117/12.237725

KEYWORDS: Polymers, Light sources, Ultraviolet radiation, Free electron lasers, Metals, Excimer lasers, Manufacturing, Micromachining, Laser cutting, Chemistry

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Proceedings Article | 10 April 1995 Paper

Surface excitation mediated physics in low-fluence laser material interactions and applications to thin-film material processing

Henry Helvajian

Proceedings Volume 2403, (1995) https://doi.org/10.1117/12.206247

KEYWORDS: Plasmons, Laser processing, Thin films, Ions, Silver, Surface plasmons, Aluminum, Materials processing, Laser applications, Metals

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Proceedings Article | 1 February 1994 Paper

Low-fluence laser excitation processes

Henry Helvajian, Lawrence Wiedeman, H.-S. Kim

Proceedings Volume 2045, (1994) https://doi.org/10.1117/12.167540

KEYWORDS: Ions, Laser processing, Silver, Arsenic, Silicon, Plasmons, Laser irradiation, Thin films, Spectroscopy, Signal processing

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Showing 5 of 32 publications

Proceedings Volume Editor (19)

SPIE Conference Volume | 27 March 2024

Laser 3D Manufacturing XI

SPIE Conference Volume | 21 April 2023

Laser 3D Manufacturing X

SPIE Conference Volume | 4 April 2022

Laser 3D Manufacturing IX

SPIE Conference Volume | 23 April 2021

Laser 3D Manufacturing VIII

SPIE Conference Volume | 25 March 2020

Laser 3D Manufacturing VII

Showing 5 of 19 publications

Conference Committee Involvement (44)

Laser 3D Manufacturing XII

28 January 2025 | San Francisco, California, United States

Laser 3D Manufacturing XI

30 January 2024 | San Francisco, California, United States

Laser 3D Manufacturing X

31 January 2023 | San Francisco, California, United States

Laser 3D Manufacturing IX

25 January 2022 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXVI

6 March 2021 | Online Only, California, United States

Laser 3D Manufacturing VIII

6 March 2021 | Online Only, California, United States

Laser 3D Manufacturing VII

4 February 2020 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXV

3 February 2020 | San Francisco, California, United States

Laser 3D Manufacturing VI

5 February 2019 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIV

4 February 2019 | San Francisco, California, United States

Laser 3D Manufacturing V

29 January 2018 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII

29 January 2018 | San Francisco, California, United States

SPIE Applications of 3D Printing

27 January 2018 | San Francisco, United States

Laser 3D Manufacturing IV

30 January 2017 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXII

30 January 2017 | San Francisco, California, United States

SPIE Applications of 3D Printing

28 January 2017 | San Francisco, United States

Laser 3D Manufacturing III

15 February 2016 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXI

15 February 2016 | San Francisco, California, United States

Synthesis and Photonics of Nanoscale Materials XIII

15 February 2016 | San Francisco, California, United States

SPIE Applications of 3D Printing

13 February 2016 | San Francisco, United States

Laser 3D Manufacturing II

10 February 2015 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XX

9 February 2015 | San Francisco, California, United States

Synthesis and Photonics of Nanoscale Materials XII

8 February 2015 | San Francisco, California, United States

SPIE Applications of 3D Printing

7 February 2015 | San Francisco, United States

Laser 3D Manufacturing

5 February 2014 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX

3 February 2014 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XVIII

4 February 2013 | San Francisco, California, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing XV

25 January 2010 | San Francisco, California, United States

Lasers and Applications in Science and Engineering

19 January 2008 | San Jose, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing XII

22 January 2007 | San Jose, California, United States

Lasers and Applications in Science and Engineering

20 January 2007 | San Jose, United States

Lasers and Applications in Science and Engineering

21 January 2006 | San Jose, United States

Lasers and Applications in Science and Engineering

22 January 2005 | San Jose, United States

Fifth International Symposium on Laser Precision Microfabrication

11 May 2004 | Nara, Japan

Laser Applications in Microelectronic and Optoelectronic Manufacturing IX

26 January 2004 | San Jose, Ca, United States

Fourth International Symposium on Laser Precision Microfabrication

21 June 2003 | Munich, Germany

MEMS Components and Applications for Industry, Automobiles, Aerospace, and Communication II

28 January 2003 | San Jose, CA, United States

Laser Applications in Microelectronics and Optoelectronic Manufacturing VIII

27 January 2003 | San Jose, CA, United States

Laser Advanced Materials Processing

27 May 2002 | Osaka, Japan

High-Power Laser Microprocessing

27 May 2002 | Osaka, Japan

MEMS Components and Applications for Industry, Automobiles, Aerospace, and Communication

22 October 2001 | San Francisco, CA, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing VI

22 January 2001 | San Jose, CA, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing V

24 January 2000 | San Jose, CA, United States

Laser Applications in Microelectronic and Optoelectronic Manufacturing IV

25 January 1999 | San Jose, CA, United States

Showing 5 of 44 Conference Committees

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