Displacement measurement based on polarization hopping of laser with optical feedback

Ligang Fei; Shulian Zhang; Xinjun Wan

doi:10.1117/12.571892

14 February 2005 Displacement measurement based on polarization hopping of laser with optical feedback

Ligang Fei, Shulian Zhang, Xinjun Wan

Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005) https://doi.org/10.1117/12.571892
Event: Photonics Asia, 2004, Beijing, China

Abstract

We demonstrate a method of displacement measurement based on polarization hopping of laser with optical feedback. The measurement system is composed of a half-intracavity He-Ne laser, a quarter wave plate and an external feedback mirror. When the conditions of the second polarization flipping are satisfied, the frequency of intensity modulation can be doubled, and one polarization switching corresponds to displacement of external mirror. Meanwhile, the intensity transfer between two polarization states will come out, i.e., an increase of one polarization light intensity always accompanies a decrease of another polarization light intensity. One period of intensity transfer can be divided into four domains: e-light, e and o-light, o-light, and no light, and each domain corresponds to change of external cavity length. According to appearing sequence of the four domains, the movement direction of external mirror can be distinguished. Our method can improve the resolution of displacement measurement 8 times that of conventional optical feedback, and reaches 40nm for a laser wavelength of 632.8nm.

Citation Download Citation

Ligang Fei, Shulian Zhang, and Xinjun Wan "Displacement measurement based on polarization hopping of laser with optical feedback", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); https://doi.org/10.1117/12.571892

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available