Abstract
A silicon micromachined membrane deformable mirror with a diameter of 10 mm, reflectivity of better than 99.8%, and a surface deflection range of has been used for intracavity control of an industrial 200-W cw Nd:YAG laser. When it was placed in the resonator, the mirror demonstrated continuous (more than 40-h) stable operation under an cw optical load, with beam diameters in the range 3–6 mm. Periodic modulation of the curvature of the deformable mirror with a frequency of 250 Hz produced quick switching between stable and unstable resonator configurations, which resulted in pulse-period -switched generation with average power in the range 50–200 W, modulation depth from 95% to 10%, and an parameter of 6.5 to 30.
© 2001 Optical Society of America
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