A high-power-handling deformable mirror system employing crystalline coatings

Garrett D. Cole; Catherine Nguyen; David Follman; Gar-Wing Truong; Egbert Krause; Tobias Böhme

doi:10.1117/12.2641048

2 December 2022 A high-power-handling deformable mirror system employing crystalline coatings

Garrett D. Cole, Catherine Nguyen, David Follman, Gar-Wing Truong, Egbert Krause, Tobias Böhme

Proceedings Volume 12300, Laser-Induced Damage in Optical Materials 2022; 123000D (2022) https://doi.org/10.1117/12.2641048
Event: SPIE Laser Damage, 2022, Rochester, New York, United States

Abstract

We outline the development of a high-power-handling deformable mirror device, based on a modified Thorlabs DMH40, employing a low-loss substrate-transferred crystalline coating as the reflective element. In standard products, this system features a metal coated (Ag or Al) 18 mm diameter × 150 μm thick BK10 glass substrate mounted to a 40-segment piezoelectric actuator, enabling Zernike compensation up to 4th order, with a peak-to-valley stroke up to ±17.6 μm. In the modified variant described here, the metal coating is replaced with a high-reflectivity (~99.998%) and low-stress (compressive, ~130 MPa) monocrystalline GaAs/AlGaAs Bragg stack transferred to the thin glass substrate via direct bonding. While maintaining similar physical performance, this custom system exhibits a substantial enhancement in power handling, with laser-induced damage tests (performed by Spica Technologies, Inc.) yielding a continuous-wave damage threshold of 75 MW/cm² at 1070 nm with a 1/e2 spot diameter of 32.8 μm.

Conference Presentation

Citation Download Citation

Garrett D. Cole, Catherine Nguyen, David Follman, Gar-Wing Truong, Egbert Krause, and Tobias Böhme "A high-power-handling deformable mirror system employing crystalline coatings", Proc. SPIE 12300, Laser-Induced Damage in Optical Materials 2022, 123000D (2 December 2022); https://doi.org/10.1117/12.2641048

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