Reliable optical pump architecture for highly coherent lasers used in space metrology applications

Hernan Erlig; Yueming Qiu; Ilya Poberezhskiy; Patrick Meras; James Wu

doi:10.1117/12.858180

21 July 2010 Reliable optical pump architecture for highly coherent lasers used in space metrology applications

Hernan Erlig, Yueming Qiu, Ilya Poberezhskiy, Patrick Meras, James Wu

Author Affiliations +

Proceedings Volume 7734, Optical and Infrared Interferometry II; 77342B (2010) https://doi.org/10.1117/12.858180
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Laser-based metrology has been identified as an enabling technology in the deployment of large, spaceborne observatories, where nanometer-level knowledge of fiducial displacement drives overall system performance. In particular, Nd:YAG NPRO (non-planar ring oscillator) based lasers have received considerable attention in this application because of their inherent high coherence at wavelengths of interest (1064 and 1319nm). However, the use of NPRO based lasers in decade long space missions is limited by typical 800nm-band pump laser diode wearout and random failure rates. Therefore, reliably achieving multi-hundred milliwatt NPRO power over prolonged mission lifetimes requires innovative pump architectures. In this paper we present a pump architecture capable of supporting continuous NPRO operation over 5.5yrs at 300mW with reliability exceeding 99.7%. The proposed architecture relies on a low-loss, high port count, all-fiber optical coupler to combine the outputs of multiple single-mode pump laser diodes. This coupler is capable of meeting the exacting environmental requirements placed by a space mission, such as SIM Lite.

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Hernan Erlig, Yueming Qiu, Ilya Poberezhskiy, Patrick Meras, and James Wu "Reliable optical pump architecture for highly coherent lasers used in space metrology applications", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342B (21 July 2010); https://doi.org/10.1117/12.858180

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