Simulation of the thermo-optic coupling effect in mid-infrared second harmonic generation of ZnGeP2 crystal
Published Online: Jul 11, 2015
Page range: 391 - 396
Received: Nov 16, 2014
Accepted: Jan 30, 2015
DOI: https://doi.org/10.1515/msp-2015-0046
Keywords
© 2015
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
The thermo-optic coupling process of second harmonic generation was numerically simulated in ZnGeP2 crystals pumped by a pulsed CO2 laser at the wavelength of 9.6 μm, under the strong and weak cooling conditions. The conversion efficiencies, temperature distributions were calculated during the evolution of the thermo-optic coupling. The results showed that the thermooptic coupling was weak in the strong cooling condition, which nearly did not disturb the conversion processes and temperature distribution, while in the weak cooling case, the temperature distribution showed a great influence on the conversion efficiency and light intensity. Finally, it was found that compensation of the phase mismatch induced by the thermal effect can well recover the conversion efficiency.