Thermal characteristics of second harmonic generation by phase matched calorimetry

We analyze a solution of the heat equation for second harmonic generation (SHG) with a focused Gaussian beam and simulate the temperature rise in SHG materials as a function of the second harmonic power and the focusing conditions. We also propose a quantitative value of the heat removal performance of SHG devices, referred to as the effective heat capacity C-alpha in phase matched calorimetry. We demonstrate the inverse relation between C-alpha and the focusing parameter xi, and propose the universal quantity of the product of C-alpha and xi for characterizing the thermal property of SHG devices. Finally, we discuss the strategy to manage thermal dephasing in SHG using the results from simulations. (C) 2014 Optical Society of America