Measurement of optical absorption coefficient of lithium triborate under the high-power CW laser radiation with Pierce oscillator circuit

We introduced a method for optical absorption of nonlinear optical crystals measurement based on a piezoelectric resonance laser calorimetry. Nonlinear crystal under examination is used as a frequency selective element in a feedback loop of RF oscillator circuit. Thus, resonance frequency is easily determined. Proposed method along with the conventional piezoelectric resonance laser calorimetry were used to measure optical absorption coefficient of litihium triborate crystal under high-power cw laser radiation.