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1 August 1990 Unstable resonator power control without beam quality degradation
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Proceedings Volume 1271, Adaptive Optics and Optical Structures; (1990)
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands
A deterministic algorithm is outlined which controls resonator loss by means of profiling active resonator mirrors to control the laser output power from an active medium. The control algorithm is designed to meet two basic requirements: that it provide a range of resonator transparency which permits laser output power ranging from zero to the maximum output power level for initial unsaturated gains or a wide range of pumping rates; and that the reference resonator output beam's quality and transverse dimensions be preserved during output power control. A stationary phase approximation is used to study the active resonator, and numerical calculations are performed for an active resonator with controlled losses. The curvatures of the axial areas of active mirrors are found to contribute most to resonator loss. Two channels of control over the curvature of the axial elements of active resonator mirrors are found to be adequate in the algorithm for loss control. Unstable control regions are identified in the numerical modeling, and the algorithm permits the control of laser output power over a range of pumping rates.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Victor V. Apollonov, Sergue A. Chetkin, Victor I. Kislov, and Gleb V. Vdovin "Unstable resonator power control without beam quality degradation", Proc. SPIE 1271, Adaptive Optics and Optical Structures, (1 August 1990);

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