高精细度光学参考腔的自主化研制

发布时间：2018-01-01 13:42

本文关键词：高精细度光学参考腔的自主化研制　出处：《物理学报》2017年08期 　论文类型：期刊论文

【摘要】：高精细度超稳光学参考腔是获得超窄线宽激光的核心部件.本文报道了面向空间应用的高精细度球形超稳光学参考腔自主化研制及其初步测试结果.设计球形腔体直径为80 mm,腔长78 mm,采用平-凹腔镜结构,凹镜曲率半径为0.5 m.使用有限元方法计算了该参考腔的震动敏感度,最佳支撑位置的震动敏感度小于1×10~(-10)/g.采用超光滑表面三级抛光技术实现光学表面粗糙度小于0.4 nm(rms)的超精密加工,采用双离子束溅射法实现工作波长反射率大于99.999%、损耗小于4 ppm腔镜镀膜,干式光胶方法键合腔体和腔镜.利用扫腔线宽法和腔衰荡法对参考腔的线宽和精细度进行了测量,结果表明该参考腔的精细度约为195000,线宽为9.8 kHz.将698 nm半导体激光器锁定到该参考腔上测得其损耗5 ppm.与实验室进口同类型参考腔相比较,主要性能指标与其相当.
[Abstract]:The high fineness ultrastable optical reference cavity is the core part of the ultra-narrow linewidth laser. This paper reports the autonomous development and preliminary test results of the high-precision spherical ultra-stable optical reference cavity for space applications. Body diameter is 80. Mm. The cavity length is 78 mm, the mirror curvature radius is 0.5 m. The vibration sensitivity of the reference cavity is calculated by finite element method. The vibration sensitivity of the best supporting position is less than 1 脳 10 ~ (-10) / g. The ultra-precision machining of optical surface roughness less than 0.4 nm / s is realized by using the super-smooth surface three-stage polishing technology. The working wavelength reflectivity is greater than 99.999 and the loss is less than 4 ppm mirror coating by dual ion beam sputtering. The cavity and mirror are bonded by dry gumming method. The linewidth and fineness of the reference cavity are measured by scanning cavity linewidth method and cavity ring-down method. The results show that the precision of the reference cavity is about 195000. The linewidth is 9.8 kHz. The loss of 698 nm semiconductor laser is measured at 5 ppm by locking it to the reference cavity. Compared with the same type of reference cavity imported in the laboratory, the main performance indexes are equivalent.
【作者单位】：中国科学院大学;中国科学院国家授时中心时间频率基准实验室;中航工业西安飞行自动控制研究所;
【基金】：国家重大科研仪器设备研制专项(批准号:61127901) 国家自然科学基金(批准号:11273024,61025023);国家自然科学基金青年科学基金(批准号:11403031)资助的课题~~
【分类号】：TN24
【正文快照】： 度,式中w为腔内激光场的共振频率,L为腔长,6L1引言和^分别为机械震动、热、声音等外部环境及腔镜布朗噪声^251引起的腔长变化量和对应的腔共近年来,基于超低膨胀系数(ultra-low expan- 振频率的变化量.实际应用中的超稳腔体通常采用sion,ULE)材料的高精细度(通常大于100000)

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