Mode-locked laser autocollimator with an expanded measurement range

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

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)15554-15569
Number of pages16
JournalOptics Express
Issue number14
Publication statusPublished - 2016 Jul 11


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