Mr. Wang Hao Profile

Wang Hao

at Shanghai Institute of Optics & Fine Mechanics CAS

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Proceedings Article | 9 August 2021 Paper

Fabrication and analysis of broadband chirped volume Bragg grating

Jianwei Mo, Fanyu Kong, Yunxia Jin, Dongbing He, Jingyin Zhao, Wang Hao

Proceedings Volume 11912, 119120K (2021) https://doi.org/10.1117/12.2602458

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In this work, based on the double cylindrical wave holographic interference method, a broadband chirped volume Bragg grating (CVBG) in photo-thermo-refractive glass (PTR) has been fabricated and studied, which has a diffraction bandwidth of about 23.8 nm. The transmittance and diffraction efficiency (DE) of the prepared CVBG were measured. The results showed that the DE and refractive index modulation (RIM) of the CVBG samples increased first and then decreased with the increase of the heat treatment time. And the transmittance of all samples decreased, indicating that the losses (sum of absorption and scattering) of the samples increased. It was found that the absorption coefficients of all samples did not exceed 0.1cm-1 even after prolonged heating, and the scattering losses accounted for the main part losses of the CVBG. Then, the thermostatic duration of the sample was shorter during heat treatment at the first time, the starting point of the RIM of CVBG became higher, which is expected to obtain higher RIM and DE of the CVBG in the subsequent heat development process. Although increasing the dose of UV exposure can reduce the losses of the CVBG, it is not conducive to the improvement of the RIM and DE of the CVBG. Therefore, we have made restrictions on both the dose of UV exposure and the duration of heat treatment. Finally, based on the fundamental matrix (F-matrix) method, the influence of the key structural parameters of the CVBG on its diffraction characteristics was analyzed, and a guidance scheme for making high-efficiency CVBG was proposed.

Proceedings Article | 9 August 2021 Paper

High efficiency multiplexed volume Bragg gratings for angle deflection at 1064nm

Wang Hao, Fanyu Kong, Yunxia Jin, Dongbing He, Jingyin Zhao, Jianwei Mo

Proceedings Volume 11912, 119120I (2021) https://doi.org/10.1117/12.2602456

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The volume Bragg grating (VBG) recorded in the photo-thermo-refractive (PTR) glass has high diffraction efficiency (DE), excellent angle selectivity, multiplexed and flexible design, which is an ideal device to achieve the angle magnification of beam scanning. In this study, a 4-channel multiplexed VBGs with the average relative diffraction efficiency (RDE) greater than 96% at 1064 nm and the maximum discrete angle deflection of 12° was designed and fabricated. And the angle deviation of experiments and design schemes were controlled less than 0.3°. The laser damage of PTR glass and multiplexed VBGs were also tested at 1064 nm. Laser damage tests were performed with a beam diameter of 0.3 mm by "1-on-1" mode. It showed that the laser damage threshold of PTR glass and multiplexed VBGs were 44.33J/cm² and 30.15 J/cm² respectively.

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