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Mode-locked laser autocollimator with an expanded measurement range

2016; Optica Publishing Group; Volume: 24; Issue: 14 Linguagem: Inglês

10.1364/oe.24.015554

1094-4087

Yuan-Liu Chen, Yuki Shimizu, Yukitoshi Kudo, So Ito, Wei Gao,

Photonic and Optical Devices

A mode-locked laser is employed as the light source of a laser autocollimator, instead of the conventionally employed single-wavelength laser, for an expanded range of tilt angle measurement. A group of the spatially separated diffracted beams from a diffraction grating are focused by a collimator objective to form an array of light spots on the focal plane of the collimator objective where a light position-sensing photodiode is located for detecting the linear displacement of the light spot array corresponding to the tilt angle of the reflector. A prototype mode-locked femtosecond laser autocollimator is designed and constructed for achieving a measurement range of 11000 arc-seconds.