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

在这项研究中，我们执行了以下三个主题，旨在证明发型的新技术。（1）开发高效且高功率的LD液化模式锁定的固态激光器，并在YB激光，光学到光度转换效率的行动中达到了220 kW/cm2的极高泵的密度，在81％的运作中，CW在CW中达到了6％的运行，在CW中达到了6％的运行。政权。通过在激光腔中插入其他光学KERR材料，简单地实现了高稳定性和效率。 ER/YB：开发了基于聚合物填充的碳纳米管的饱和吸收镜锁定的玻璃激光模式。在ER/YB：玻璃激光器中实现的最短脉冲宽度（68 fs）已达到。（2）在频谱扩展的ND：玻璃激光器梳子和可调CW激光器之间的“波长梳子”频率拍打中，使用平坦的噪声噪声和可调的CW激光器观察到了平坦的噪声，并且比40 db的信号噪声比率更好。相锁的可调式选择……已经开发了更多的IC速率发生器。波长参考激光器是通过锁定到低热膨胀玻璃参考腔的CW ND：YAG激光器进行的。当将梳子的一种模式锁定到参考激光器上时，周围模式的波长简单地稳定了。通过这种方式，已经开发了新的“波长梳子”的方案。（3）将深度位移测量值频率频率可触发CW激光与Fabry-Perot腔相锁定，以进行位移测量，并评估了稳定性。在不使用波长梳子的情况下，由于环境反射性索引的变化，观察到1小时内测得的腔长10 nm的漂移。另一方面，通过使用波长梳子，将漂移急剧抑制至晚上10点。在本文中，其中一个空腔镜被商业的纳米位置阶段移动。以小于100 pm的不确定性成功测量了12 UM的位移。证明了对阶段的可重复性和非线性的评估。较少的