CAJ | 학술논문

热效应仍是限制激光放大器向高功率、高光束质量进一步发展的瓶颈问题,高效的热管理是抑制热效应的重要技术途径.研究了基于激光二极管抽运氦气冷却的钕玻璃叠片激光放大器的热效应.利用有限元数值模拟的方法,分析了钕玻璃的温度、应力应变和应力双折射分布,并计算了热致波前畸变和退偏损耗,与实验结果符合得较好,在热沉积为0.7 W/cm3的条件下,6片钕玻璃总的热致波前畸变为6.77λ,最大退偏量大于90%.
열효응잉시한제격광방대기향고공솔、고광속질량진일보발전적병경문제,고효적열관리시억제열효응적중요기술도경.연구료기우격광이겁관추운양기냉각적녀파리첩편격광방대기적열효응.이용유한원수치모의적방법,분석료녀파리적온도、응력응변화응력쌍절사분포,병계산료열치파전기변화퇴편손모,여실험결과부합득교호,재열침적위0.7 W/cm3적조건하,6편녀파리총적열치파전기변위6.77λ,최대퇴편량대우90%.
Thermal effect is still the most serious problem: it restricts the high power and high beam quality of solid laser to be further enhanced. The e?cient thermal management is an important approach to suppress the thermal effect. In this paper, the thermal effect in a gas-cooled laser diode pumped multislab Nd:glass amplifier operating at a repetition rate is investigated in detail both theoretically and experimentally. The three-dimensional distributions of temperature, stress, strain, and birefringence are calculated by a finite element analysis. Based on these data, the thermally induced wavefront distortions and depolarization losses are determined with considering six slabs and one laser head. It is revealed that the theoretical data are in good agreement with the experimental results: the total wavefront distortion is 6.77λand a depolarization loss of more than 90%accumulates over six slabs when the heat deposition is 0.7 W/cm3.