CAJ | 학술논문

针对目前最常用的KTP倍频晶体,综合考虑其有效非线性系数和温度半宽度,采用折中设计有效扩展KTP倍频器件适用温度范围.对大适用温度范围的KTP倍频器件的设计方法进行了详细的理论分析,并设计了一种温度半宽度为?20?C到50?C的KTP倍频器件.实验结果表明该器件在15?C时达到峰值转换效率22.7%,温度半宽度为70?C.和通常情况下设计的KTP倍频器件相比,尽管倍频转换效率有所下降,但显著提高了适用温度范围.且在温度半宽度高达70?C情况下,其有效非线性系数仍大于LBO, BBO等倍频器件.该方法对于扩展倍频器件的温度适应性具有普适性.
침대목전최상용적KTP배빈정체,종합고필기유효비선성계수화온도반관도,채용절중설계유효확전KTP배빈기건괄용온도범위.대대괄용온도범위적KTP배빈기건적설계방법진행료상세적이론분석,병설계료일충온도반관도위?20?C도50?C적KTP배빈기건.실험결과표명해기건재15?C시체도봉치전환효솔22.7%,온도반관도위70?C.화통상정황하설계적KTP배빈기건상비,진관배빈전환효솔유소하강,단현저제고료괄용온도범위.차재온도반관도고체70?C정황하,기유효비선성계수잉대우LBO, BBO등배빈기건.해방법대우확전배빈기건적온도괄응성구유보괄성.
For the most commonly used KTP frequency-doubling crystal, its temperature adaptability range should be ef-fectively extended. For this purpose, a compromise design is given by comprehensively considering both its effective nonlinear coe?cient and the half-width of temperature range. The design method of KTP frequency-doubling device with a wide temperature range is analyzed in detail;furthermore, the curves of effective nonlinear coe?cients, acceptance angles, and walk-off angles as a function of phase-matching angle are plotted via computer simulation. According to the results of theoretical study, a device used in the temperature range from?20 ?C to 50 ?C is designed and validated ex-perimentally by the KTP external cavity frequency-doubling laser. Experimental results indicate that a peak conversion e?ciency of 22.7%at 15 ?C with a 70 ?C temperature halfwidth is achieved by using the designed device. Compared with the commonly designed KTP frequency-doubling device, the temperature adaptability range increases notably although its frequency conversion e?ciency decreases a little. Additionally, the effective nonlinear coe?cient is still bigger than that of the commonly used crystals such as LBO and BBO when temperature halfwidth increases to 70 ?C. The above method would have the potential for extending the temperature adaptability range of other frequency-doubling devices.