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Absolute optical frequency scanning interferometry for picometer displacement measurement using femtosecond optical combs

使用飞秒光梳进行皮米位移测量的绝对光频扫描干涉仪

基本信息

批准号：
17360034
负责人：
MINOSHIMA Kaoru
金额：
$ 9.92万
依托单位：
National Institute of Advanced Industrial Science and Technology (AIST)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

In this study, we performed the following three topics aiming to demonstrate the new technique for picometer interferometric measurements.(1)Development of highly efficient and high-power LD-pumped mode-locked solid-state lasersWith extremely high pump density of 220 kW/cm2 in Yb laser, optical-to-optical conversion efficiency of 81 % has been achieved in the CW operation regime, and 62 % in the pulse operation regime. By inserting additional optical Kerr material in the laser cavity, high stability and efficiency have been realized simultaneously. Er/Yb : glass laser mode-locked by saturable absorber mirrors based on polymer-embedded carbon nanotubes was developed. The shortest pulse width (68 fs) ever achieved in the Er/Yb:glass laser has been achieved.(2)Development of "wavelength comb"Frequency beat between a spectrally broadened Nd : glass-laser comb and a tunable CW laser was observed with a flat noise-floor and signal-to-noise ratio of better than 40 dB. Phase-locked tunable opt … More ical frequency generator has been developed. Wavelength reference laser was made by a CW Nd:YAG laser locked to a low-thermal-expansion-glass reference cavity. When one of the modes of the comb was locked to the reference laser, wavelengths of the surrounding modes were simultaneously stabilized. In this way, new scheme of "wavelength comb" has been developed.(3)Inteferometric displacement measurementFrequency-tunable CW laser was phase-locked to the Fabry-Perot cavity for displacement measurements and the stability was evaluated. Without the use of wavelength comb, the drift in the measured cavity-length for 10 nm during 1 hour was observed due to the environmental air-refractive-index change. On the other hand, by using the wavelength comb, the drift has been dramatically suppressed down to 10 pm.Finally, one of the cavity mirrors was moved by a commercial nano-positioning stage. Displacement of 12 um was successfully measured with smaller than 100-pm uncertainty. Evaluation of repeatability and nonlinearity of the stage was demonstrated. Less

(1)高效大功率LD泵浦锁模固体激光器的研制在Yb激光器泵浦密度为220kW/cm2的超高泵浦密度下，在连续运转模式下获得了81%的光光转换效率，在脉冲运转模式下获得了62%的光光转换效率。通过在激光腔中插入额外的光学克尔材料，同时实现了高稳定性和高效率。研制了基于聚合物包埋碳纳米管的可饱和吸收镜锁模Er/Yb：玻璃激光器。在Er/Yb：玻璃激光器中实现了最短的脉冲宽度(68ps)。(2)观察到了光谱展宽的Nd：玻璃激光梳子和可调谐的连续激光之间的“波长梳”频率差拍，其噪声底板平坦，信噪比优于40分贝。锁相可调OPT…研制出了更实用的频率发生器。波长参考激光器是由锁定在低热膨胀玻璃参考腔中的连续波Nd：YAG激光器制成的。当梳子的其中一个模式被锁定到参考激光时，周围模式的波长同时稳定。干涉式位移测量将可调谐连续激光器锁相到法布里-珀罗腔中进行位移测量，并对其稳定性进行了评价。在不使用波长梳的情况下，观察到由于环境空气折射率的变化，测量的腔长在1小时内漂移了10 nm。另一方面，通过使用波长梳，漂移被显著地抑制到10pm。最后，利用商用纳米定位平台移动了其中一个腔镜。成功地测量了12um的位移，测量不确定度小于100-pm。对该平台的重复性和非线性度进行了评价。较少