Control of laser radiation parameters

Experimental investigation of the spatial structure of the beam profile of a laser with a Sagnac interferometer

V. V. Grabovskii, V. I. Prokhorenko, D. Ya. Yatskiv

Institute of Semiconductor Physics NAS, Kiev

Abstract: An experimental investigation was made of the spatial structure of the output beam profile of an Nd³⁺:YAG laser with a cavity based on a Sagnac interferometer. In a wide range of pulse repetition frequencies, the output beam profile could be described by a Gaussian curve with a confidence probability of at least 99%. This corresponded to the emission of the TEM₀₀ mode from a stable cavity. The diameter of the radiation spot was inversely proportional to the shift of a thermo-optical lens from the centre of the Sagnac interferometer.

PACS: 42.55.Rz, 42.60.Jf

Received: 01.01.1996

 English version: Quantum Electronics, 1996, 26:4, 327–329

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