Brief Communications

Nonthermal nature of the radiation generated in the bulk of alkali halide crystals by CO$_2$ laser pulses

V. P. Krutyakova, V. N. Smirnov


Abstract: An investigation was made of radiation flashes resulting from internal focusing of CO$_2$ laser pulses in samples of commercial-grade NaCl, KCl, and KBr crystals. The flashes were attributed to triboluminescence in cracks formed under the action of thermoelastic stresses near absorbing inhomogeneities heated by laser radiation to temperatures $\lesssim 1000$ K. This conclusion was confirmed by low values of the power density ($<10^7$ W/cm$^2$) of the incident laser radiation at which the flashes were observed, by the results of investigations of the kinetics of these flashes and growth of the scattering, by the comparable rates of decay of the flash radiation in different parts of the spectrum, and by the difference between the spectra of the flashes from the spectrum of a Planck source.

UDC: 621.373:535.377

PACS: 78.60.Mq, 61.80.-x, 42.60.He

Received: 09.02.1981

 English version: Soviet Journal of Quantum Electronics, 1981, 11:9, 1225–1227

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