External-cavity birefringence feedback effects of microchip Nd:YAG laser and its application in angle measurement |
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| Authors: | Ren Cheng Tan Yi-Dong and Zhang Shu-Lian |
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| Affiliation: | State Key Laboratory of Precision Measurement Technology
and Instruments, Department of Precision Instruments \&
Mechanology, Tsinghua University, Beijing 100084, China |
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| Abstract: | External-cavity birefringence feedback effects of the microchip Nd:YAG
laser are presented. When a birefringence element is placed in the
external feedback cavity of the laser, two orthogonally polarized
laser beams with a phase difference are output. The phase difference
is twice as large as the phase retardation in the external cavity
along the two orthogonal directions. The variable extra-cavity
birefringence, caused by rotation of the external-cavity
birefringence element, results in tunable phase difference between
the two orthogonally polarized beams. This means that the roll angle
information has been translated to phase difference of two output
laser beams. A theoretical analysis based on the Fabry--Perot cavity
equivalent model and refractive index ellipsoid is presented, which
is in good agreement with the experimental results. This phenomenon
has potential applications for roll angle measurement. |
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| Keywords: | microchip laser external-cavity
birefringence feedback orthogonally polarized lasers angle
measurement |
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