Large-optics shearing interferometer for the wavefront sensing of widely tunable laser

Zhu Luan; Lijuan Wang; Yu Zhou; Enwen Dai; Jianfeng Sun; Liren Liu

doi:10.1117/12.859761

2 August 2010 Large-optics shearing interferometer for the wavefront sensing of widely tunable laser

Zhu Luan, Lijuan Wang, Yu Zhou, Enwen Dai, Jianfeng Sun, Liren Liu

Author Affiliations +

Proceedings Volume 7790, Interferometry XV: Techniques and Analysis; 779012 (2010) https://doi.org/10.1117/12.859761
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

There is large aperture and diffraction-limited laser beam in the space laser applications such as laser communication. Laser wavefront can be measured by shearing interferometer or Shark-Hartmann sensor etc. Large-Optics shearing interferometer based on Mach-Zehnder plate structure has been manufactured to differentially analyze the laser wavefront from two parts of aperture-divided fringes. One of six optical plates of the interferometer is divided to the up part and the down. The precision of measurement is higher than the full aperture design. It is suitable for the diameter below 290mm with the changeable shear amount from 1mm to 150mm. There are two sets of collimators used for the parallel of the plates. Another single-mode 635nm laser collimator which is measured through double-shearing plate before is serving as a standard wavefront of 150mm diameter. One path of the interference is changed with precise adjustment unit in several microns that the interference may be happened between equal optical path reflection and the other. It can be used for widely tunable laser and other laser system which has short coherent length. The apparatus and the experiments are explained in detail in this paper. Many systems of different quality and diameter and coherent length are measured by the large-optics shearing interferometer. The experimental wavefront results are fitted to Zernike polynomial and the Zernike coefficients are derived.

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Zhu Luan, Lijuan Wang, Yu Zhou, Enwen Dai, Jianfeng Sun, and Liren Liu "Large-optics shearing interferometer for the wavefront sensing of widely tunable laser", Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 779012 (2 August 2010); https://doi.org/10.1117/12.859761

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KEYWORDS

Wavefronts

Mirrors

Shearing interferometers

Tunable lasers

Collimators

Interferometers

Wavefront sensors

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