This paper describes what is thought to be the first generation of a continuous wave deep ultraviolet laser at 275 nm by efficient frequency doubling of a blue-diode-pumped Pr:YLF laser at 550 nm.By employing a novel ...This paper describes what is thought to be the first generation of a continuous wave deep ultraviolet laser at 275 nm by efficient frequency doubling of a blue-diode-pumped Pr:YLF laser at 550 nm.By employing a novel fast-axis collimated blue semiconductor laser as the pump source,combined with a folded cavity and innovation coating technology,and utilizing a Brewster-cut BBO crystal for intracavity frequency doubling,TEM00 mode deep UV laser radiation at 275 nm with an output power of 351 mW is obtained.This marks the first report of achieving 275 nm laser generation based on Pr:LiYF4 to date.展开更多
为了研制激光干涉成像所需的基于主振荡功率放大（Master Oscillator Power Amplifier,MOPA）结构的高能高相干脉冲单频激光器,需要研究经过功率放大后的脉冲时间相干性随激光功率（或能量）增加的变化趋势。本文采用声光调Q脉冲单频Nd...为了研制激光干涉成像所需的基于主振荡功率放大（Master Oscillator Power Amplifier,MOPA）结构的高能高相干脉冲单频激光器,需要研究经过功率放大后的脉冲时间相干性随激光功率（或能量）增加的变化趋势。本文采用声光调Q脉冲单频Nd：YVO_4激光器作为种子源,利用Nd：YAG功率放大模块对种子源激光进行2.1倍的脉冲能量放大。利用迈氏干涉测量法,完成种子源和2.1倍功放后激光在0～6 m光程差下干涉条纹对比度的实验测量,从而初步得到脉冲激光时间相干性（线宽）随激光功率（或能量）增加的变化趋势。同时也完成种子源和功放后激光的单频性、单脉冲能量、脉宽和峰值功率等基本参数的实验测量。展开更多
设计了一种低阈值短腔随机分布反馈光纤激光器,采用1455 nm的激光二极管泵浦一段色散补偿光纤,采用正向反馈和反向反馈两种结构分别将一阶随机激光阈值降至760 m W和520 m W,且反向反馈结构的二阶阈值与一阶阈值相同,分析了色散补偿光...设计了一种低阈值短腔随机分布反馈光纤激光器,采用1455 nm的激光二极管泵浦一段色散补偿光纤,采用正向反馈和反向反馈两种结构分别将一阶随机激光阈值降至760 m W和520 m W,且反向反馈结构的二阶阈值与一阶阈值相同,分析了色散补偿光纤长度对阈值的影响,实验证明优化色散补偿光纤长度是降低一阶与二阶随机激光阈值的有效方法。展开更多
文摘This paper describes what is thought to be the first generation of a continuous wave deep ultraviolet laser at 275 nm by efficient frequency doubling of a blue-diode-pumped Pr:YLF laser at 550 nm.By employing a novel fast-axis collimated blue semiconductor laser as the pump source,combined with a folded cavity and innovation coating technology,and utilizing a Brewster-cut BBO crystal for intracavity frequency doubling,TEM00 mode deep UV laser radiation at 275 nm with an output power of 351 mW is obtained.This marks the first report of achieving 275 nm laser generation based on Pr:LiYF4 to date.
文摘为了研制激光干涉成像所需的基于主振荡功率放大（Master Oscillator Power Amplifier,MOPA）结构的高能高相干脉冲单频激光器,需要研究经过功率放大后的脉冲时间相干性随激光功率（或能量）增加的变化趋势。本文采用声光调Q脉冲单频Nd：YVO_4激光器作为种子源,利用Nd：YAG功率放大模块对种子源激光进行2.1倍的脉冲能量放大。利用迈氏干涉测量法,完成种子源和2.1倍功放后激光在0～6 m光程差下干涉条纹对比度的实验测量,从而初步得到脉冲激光时间相干性（线宽）随激光功率（或能量）增加的变化趋势。同时也完成种子源和功放后激光的单频性、单脉冲能量、脉宽和峰值功率等基本参数的实验测量。
文摘设计了一种低阈值短腔随机分布反馈光纤激光器,采用1455 nm的激光二极管泵浦一段色散补偿光纤,采用正向反馈和反向反馈两种结构分别将一阶随机激光阈值降至760 m W和520 m W,且反向反馈结构的二阶阈值与一阶阈值相同,分析了色散补偿光纤长度对阈值的影响,实验证明优化色散补偿光纤长度是降低一阶与二阶随机激光阈值的有效方法。
文摘利用不同波长的蓝光激光二极管,采用不同方式抽运掺镨氟化钇锂(Pr:YLF)晶体,利用I类相位匹配的偏硼酸钡(BBO)为倍频晶体,腔内倍频产生中心波长为261.37 nm连续紫外激光器。采用V型折叠腔结构,利用两支不同波长的蓝光激光二极管(444 nm和469 nm)单独泵浦晶体,经过优化,将两支蓝光激光二极管合光后作为抽运源,增大泵浦功率的同时,保留了Pr:YLF晶体对其高的偏振吸收效率。Pr:YLF晶体的长度为5 mm,掺杂浓度为0.5%,在抽运光功率为2800 m W时获得了最大输出功率245 m W的连续紫外261.37 nm激光器,光光转换效率约为8.75%。
