Mr. Kegan Orlowski Profile

Kegan Orlowski

at Fibertek Inc

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Proceedings Article | 12 April 2021 Presentation

Ultra-compact transmitter for space-based lidar

Kegan Orlowski, Khoa Le, Corey Dickson, Nigel Martin, Nicholas Sawruk

Proceedings Volume 11744, 117440E (2021) https://doi.org/10.1117/12.2587989

KEYWORDS: Transmitters, LIDAR, Temperature metrology, Laser development, Laser applications, Head, Additive manufacturing, Resonators, Materials processing, Laser resonators

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Fibertek, Inc designed, built, and tested an ultra-compact, lightweight flash lidar laser transmitter for NASA's entry, descent, and landing applications. The laser transmitter can be used in various commercial applications that benefit from SWaP improvements. The laser transmitter has a volume of .5 Liters, weighs .810 kilograms, and has a power draw less than 20W. The system produces an output pulse energy >10mJ, a pulse-width of about 5ns at a pulse repetition frequency of 5-30 Hz, and a beam quality of M2< 2. The use of additive manufacturing in the design of the space qualifiable laser is a key innovation that allowed us to reduce the size and weight of the laser transmitter. Fibertek, in partnership with researches at the Pennsylvania State University Center for Innovative Materials Processing, developed state-of-the-art additive methods to manufacture our topology optimized bench and covers. The laser transmitter combines our ultra-compact resonator and electronics into a single deliverable TRL-5 Package. We achieved a 5x reduction in volume from previous generation Fibertek flash lidar transmitters with a weight under a kilogram. Another innovation is the development of an athermal integrating-box pump head design. The pump head design allows the laser transmitter to operate over a wide range of temperatures with purely conductive cooling. We tested a temperature range of 15C to 50C without significant change in performance. The athermal design allows the laser transmitter to perform in a wide range of environments.

Proceedings Article | 12 April 2021 Presentation + Paper

Maturation of a single frequency ErYAG laser for water vapor/methane DIAL application

Patrick Burns, Moran Chen, Kegan Orlowski, Dave Pachowicz

Proceedings Volume 11744, 117440D (2021) https://doi.org/10.1117/12.2587891

KEYWORDS: Laser development, Earth's atmosphere, Climate change, Absorption, Transmitters, Reliability, Methane, Laser systems engineering, Airborne laser technology

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Fibertek is under contract with Nasa Langley for the development of a laser transmitter for water vapor differential absorption lidar (DIAL) measurements. Water vapor plays a central role in feedback mechanisms linking components and processes in the Earth’s atmosphere. Studying atmospheric water vapor content is important for understanding global energy transport and climate change. The driving design parameter for the water vapor DIAL application is a narrow single frequency linewidth with wavelength tunability that is coincident with a water vapor absorption line. Fibertek has developed a frequency doubled seeded single frequency resonantly pumped ErYAG laser system that can probe water vapor lines in the 822-823nm band. As an added benefit, the laser fundamental wavelength at 1645nm allows for probing atmospheric methane, which also plays an important role in climate change research. The laser emits 3mJ at 1645nm and 3mJ at 822nm at 1kHz with beam quality on the order of M²=1.6. Fibertek has packaged the ErYAG laser in an environmentally hardened housing for an airborne DIAL application. This paper will present current results of the ErYAG laser work, progress in increasing the output power, efficiency, and reliability of the laser to meet requirements for a follow-on space qualifiable laser and plans for environmental testing the system.

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