Extra-short He-Ne lasers based on mode split

An extra-short He-Ne laser (shorter than 100mm) does not work well because there is likely no longitudinal mode in the lasing bandwidth sometimes and the output power rises and falls deeply from time to time.A method to solve this problem has been presented and investigated.A piece of quartz crystal plate appropriately designed is used as a cavity mirror of a He-Ne laser,which has a longitudinal mode spacing larger than the lasing bandwidth to make the equal-spacing mode split.In other words,the number of longitudinal modes is doubled and the actual mode spacing is reduced to the half of that without mode split.Therefore,there is always at least one mode operating in the lasing bandwidth and the power is stable at any room temperature.Such a laser with 85mm cavity length and 0.24mW output power has been made.     

波长632.8nm的He-Ne激光器在不同频差下的功率调谐曲线

激光纵模分裂技术能使双频激光器的频差从几十兆赫到几百兆赫,我们进行了一系列的实验来研究不同频差下激光器的光输出功率特性,实验结果表明,不论激光器充Ne²⁰还是Ne²²,也不管输出光的频差多大,随着腔长的调谐,o光和e光的功率变化方向是相反的.     

一种新的光密度扫描仪

研制了一种新的光密度扫描仪，采用激光源，光密度测量范围提高到３［ＯＤ］，有更好的线性和精度，仪器的计算机系统可根据用户需要灵活配置。莱单用中文显示，使中国人更易操作。     

双折射双频激光器增益曲线对稳频的影响

本文分析了双折射双频激光器增益曲线的特点,增益曲线影响频率稳定性,比较了不同比例的Ne20和Ne22形成的增益曲线,通过分析和实验获得最佳的Ne20和Ne22的比例,实验结果改善了频率稳定度.