FAST HIGHLY EFFICIENT PHASE-CONJUGATE MIRROR, BASED ON INAS, IN THE CAVITY OF A REPETITIVELY PULSED CO2-LASER

Theoretical and experimental investigations were made of the temperatu re dependences (in the range 300-500 K) of the nonlinear susceptibilit y and of the linear and nonlinear absorption coefficients of InAs. The results were used to calculate the temperature dependence of the four -wave mixing reflection efficiency. It was found that a phase-conjugat e mirror, made of InAs 0.2-0.3 cm thick, was capable of a high reflect ion efficiency (exceeding 100%) when the crystal was heated to similar to 310 K. Thermally stable reflection with an efficiency of 30%-50% w as possible in the temperature range 300-500 K when the crystal thickn ess was 0.05-0.1 cm. A phase-conjugate mirror was constructed with a r eflection efficiency exceeding 200%, when the pulse repetition rate wa s up to 12.5 Hz and the total number of pulses was up to 12. It should be possible to operate such a phase-conjugate mirror at pulse repetit ion rates up to similar to 100 Hz or higher.