Anisotropic optical feedback of single frequency intra-cavity He--Ne laser
Zhou Lu-Fei(周鲁飞)a), Zhang Bin(张斌)b), Zhang Shu-Lian(张书练)a), Tan Yi-Dong(谈宜东)a), and Liu Wei-Xin(刘维新)a)
aThe State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China; bDepartment of Optics Science and Technology, National University of Defense Technology, Hunan 410073, China
Abstract This paper presents the anisotropic optical feedback of a single frequency intra-cavity He--Ne laser. A novel phenomenon was discovered that the laser output an elliptical polarized frequency instead of the initial linear polarized one. Two intensities with a phase difference were detected, both of which were modulated in the form of cosine wave and a fringe shift corresponds to a $\lambda$/2 movement of the feedback mirror. The phase difference can be continuously modulated by the wave plate in the external cavity. Frequency stabilization was used to stabilize the laser frequency so as to enlarge the measuring range and improve the measurement precision. This anisotropic optical feedback system offers a potential displacement measurement technology with the function of subdivision of $\lambda$/2 and in-time direction judgment. The three-mirror Fabry--Perot cavity model is used to present the experimental results. Given the lack of need of lasing adjustment, this full intra-cavity laser can significantly improve the simplicity and stability of the optical feedback system.
Received: 27 June 2008
Revised: 16 August 2008
Accepted manuscript online:
PACS:
42.55.Lt
(Gas lasers including excimer and metal-vapor lasers)
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 60437010).
Cite this article:
Zhou Lu-Fei(周鲁飞), Zhang Bin(张斌), Zhang Shu-Lian(张书练), Tan Yi-Dong(谈宜东), and Liu Wei-Xin(刘维新) Anisotropic optical feedback of single frequency intra-cavity He--Ne laser 2009 Chin. Phys. B 18 1141
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
