Vol. 11, issue 07, article # 17

Andreev Yu.M., Bhar G.H., Gribenyukov A.I., Verozubova V.A., Vodop'yanov K.L. Tunable parametric superluminescence in ZnGeP2 nonlinear crystals. // Atmospheric and oceanic optics. 1998. V. 11. No. 07. P. 669-672.
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Temperature tunability of parametric superluminescence in ZnGeP2 crystal has been investigated. This crystal is promising for development of coherent radiation sources overlapping all atmospheric optical windows in the middle IR region. Q-switched, actively mode-locked and damped Er3+:YSGG laser (2.79 mm) was used as a pumping source. Wavelength gap 5.3 ~ 5.9 mm near degeneracy in II type of parametric interaction, which was not covered by angular tuning, was partially covered by crystal temperature rise. The result was explained by changes in phonon absorption, birefringence, and thermal optical coefficient with the temperature rise. Temperature tuning eliminated beam work-off (displacement) which always exists in angular tuning.