Heterodyne wavelength meter for continuous-wave lasers.
Heterodyne wavelength meter for continuous-wave lasers.
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DOI：
10.1364/ao.46.005631
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发表时间：
2007-08
期刊：
影响因子：
1.9
通讯作者：
X. Wang;Yan Li;Shulian Zhang
中科院分区：
文献类型：
--
作者：
X. Wang;Yan Li;Shulian Zhang
介绍了一种基于外差干涉仪的波长计。利用声光调制器将单波长的测试激光束调制成两个正交的不同频率的线偏振分量。然后将调制后的激光束和一束双波长激光束在同一光路上送入外差干涉仪，两束激光在外差干涉仪中的干涉相移之比等于它们的波长之比。外差技术测量的是外差干涉相位而不是干涉强度，这意味着它可以测量强度不稳定的光源。外差干涉信号是一种交流信号，可以很容易地放大和处理构成外差波长计的电路，并且即使在存在环境干扰的情况下也可以用于测量低强度光源。测量了波长范围为630-637 nm的可调谐二极管激光器，其精度为5/10（7）。
A wavelength meter based on a heterodyne interferometer is presented. A single-wavelength test laser beam is modulated to two orthogonal linearly polarized components with different frequencies by a pair of acousto-optic modulators. Then the modulated laser beam and a two-wavelength laser beam are sent to a heterodyne interferometer in a common path. The ratio of two laser interference phase shifts in the heterodyne interferometer is equal to the ratio of their wavelengths. The heterodyne technique measures the heterodyne interference phase but not the interference intensity, which means that it could measure a light source whose intensity is not stable. The heterodyne interference signal is an alternating signal that can easily magnify and process the circuit that makes up the heterodyne wavelength meter and could be used to measure the low-intensity light source even when there are environmental disturbances. A tunable diode laser wavelength range of 630-637 nm has been measured to an accuracy of 5 parts in 10(7).