Broadband spatial optical filtering with a volume Bragg grating and a blazed grating pair

Guanjin Chen; Xiaojie Sun; Xiao Yuan; Guiju Zhang

doi:10.1117/12.2283465

24 October 2017 Broadband spatial optical filtering with a volume Bragg grating and a blazed grating pair

Guanjin Chen, Xiaojie Sun, Xiao Yuan, Guiju Zhang

Proceedings Volume 10457, AOPC 2017: Laser Components, Systems, and Applications; 1045712 (2017) https://doi.org/10.1117/12.2283465
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

A broadband spatial optical filtering system is presented in this paper, which is composed of a Volume Bragg Grating (VBG) and a blazed grating pair. The diffraction efficiency and filtering properties are calculated and simulated by using Fourier diffraction analysis and Coupled Wave Theory. A blazed grating pair and VBG structures are designed and optimized in our simulation. The diffraction efficiency of filtering system shows more than 77.2% during the wavelength period from 953nm to 1153nm, especially 84.1% at the center wavelength. The beam quality is described with near-field modulation (M) and contrast ratio (C). The M of filtering beam are 1.44, 1.49 and 1.55, respectively and the C of filtering beam are 10.1%, 10.2% and 10.5% , respectively and the beam intensity distribution is great improved. The cut-off frequencies of three filtering systems are 1.57mm^-1 , 2.06 mm^-1 and 2.38 mm^-1 , respectively from power spectral density (PSD) curve. It’s clear that the cut-off frequency of filtering system is closely related to the angular selectivity of VBG, and the value of cut-off frequency is decided by VBG’s Half Width at First Zero (HWFZ) and center wavelength.

Citation Download Citation

Guanjin Chen, Xiaojie Sun, Xiao Yuan, and Guiju Zhang "Broadband spatial optical filtering with a volume Bragg grating and a blazed grating pair", Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 1045712 (24 October 2017); https://doi.org/10.1117/12.2283465

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