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5623530 
Journal Article 
Optical frequency domain angle measurement in a femtosecond laser autocollimator 
Chen, YL; Shimizu, Y; Tamada, J; Kudo, Y; Madokoro, S; Nakamura, K; Gao, W 
2017 
1 
Optics Express
ISSN: 1094-4087 
25 
14 
16725-16738 
English 
28789174 
WOS:000407815100100 
A mode-locked laser autocollimator, in which a group of first-order diffracted beams from a grating reflector are detected by an autocollimation unit, has an expanded angle measurement range compared with a conventional autocollimator using a single-wavelength laser source. In this paper, a new optical frequency domain angle measurement method is proposed to increase the visibility of output signal of the mode-locked femtosecond laser autocollimator, which is limited by the overlap of the focused diffracted light spots. The output visibility of a prototype femtosecond laser autocollimator has been increased by the proposed method to approximately 100% over a large range of 21600 arc-seconds.