Open AccessOptical frequency domain angle measurement in a femtosecond laser autocollimator
Author(s) -
Yuan Liu Chen,
Yuki Shimizu,
Jun Tamada,
Yukitoshi Kudo,
Shuhei Madokoro,
Kazuki Nakamura,
Wei Gao
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.016725
Subject(s) - optics , femtosecond , laser , diffraction , materials science , physics
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.