Mr. Furqan L. Chirag Profile

Furqan L. Chirag

at Velos

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Proceedings Article | 9 September 2019 Presentation + Paper

The Global Ecosystem Dynamics Investigation (GEDI) Lidar laser transmitter

D. Barry Coyle, Paul Stysley, Furqan Chirag, Erich Frese, Demetrios Poulios

Proc. SPIE. 11128, Infrared Remote Sensing and Instrumentation XXVII

KEYWORDS: Transmitters, LIDAR, Laser development, Nd:YAG lasers, Q switched lasers, Earth sciences, Pulsed laser operation

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The Global Ecosystems Dynamics Investigation (GEDI) Lidar, is an Earth Science remote sensing instrument aboard the International Space Station (ISS) and the Japanese Experiment Module (JEM). Its core mission is to measure the global carbon balance of Earth’s forests by using a set of three solid state laser transmitters in a multibeam waveform capture lidar technique. GEDI’s laser transmitters and precision optical system transmits over 3.4 million laser pulses to the Earth every hour, each pulse producing an individual 3-D biomass column measurement. To enable a successful two-year mission, the lasers had to be reliable, highly repeatable in performance with each measurement power cycle, and designed with minimal part count for reduced manufacture complexity and cost. These transmitters are in-house products; developed, constructed, qualified, and fully integrated into the GEDI instrument at NASA’s Goddard Space Flight Center. We will present the lasers’ path from initial design to flight operation, with emphasis on the major milestones, critical issues, and lessons learned. Full credit goes to the excellent team effort that led to the successful commissioning and initiation of full-time science operations in March 2019.

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