Brief Communications

Measurement of the spatial coherence of CO₂ laser radiation by the frequency up-conversion method

V. M. Gordienko, P. I. Chernega


Abstract: A polarizing interferometer and a photomultiplier operated as a photon counter were used in measurements of the spatial correlation function of the radiation field of a CO₂ laser, which was up-converted from the infrared range in a proustite crystal. The proposed method made it possible to use a low-power He–Ne laser as a pump source in parametric conversion and to make high-precision measurements.

UDC: 621.378.325

PACS: 42.55.Lt, 42.60.By, 42.60.Jf, 42.65.Ky, 85.60.Ha, 07.60.Ly

Received: 04.07.1974

 English version: Soviet Journal of Quantum Electronics, 1975, 4:12, 1477–1478