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http://dx.doi.org/10.3807/HKH.2008.19.2.144

Wavefront Distortion caused by High Energy Laser Beam in the Relay Mirrors of the Laser Beam Director  

Choi, Jong-Ho (Agency for Defense Development)
Kim, Yeon-Soo (Agency for Defense Development)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.2, 2008 , pp. 144-149 More about this Journal
Abstract
Thermal distortion of the laser mirrors which are the Coude mirrors of the laser beam director and the wavefront error caused by the thermal distortion are studied. Coude mirrors consist of three relay mirrors and one fast steering mirror. The mirrors have reflectivity of 99.5% with respect to the laser wavelength of $3.8\;{\mu}m$, and absorption of 500 W per second. Thermal distortion and its related wavefront errors are studied with laser beam irradiation for 5 seconds. For the relay mirror, the wavefront error is 334 nm_PV, 98 nm rms and for fast steering mirror, $11.5\;{\mu}m$_PV, $3{\mu}m$ rms.
Keywords
Finite element analysis; thermal distortion; wavefront error;
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