Study on grating feedback characteristics of distributed feedback quantum cascade laser

Liu Ying; Jiang Tao; Yang Qi; Wang Xuemin; Zhan Zhiqiang; Zou Ruijiao; Luo Jiawen; Fan Long; Chen Fengwei; Wu Weidong

doi:10.11884/HPLPB202234.220131

Volume 34 Issue 11

Sep. 2022

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Liu Ying, Jiang Tao, Yang Qi, et al. Study on grating feedback characteristics of distributed feedback quantum cascade laser[J]. High Power Laser and Particle Beams, 2022, 34: 111005. doi: 10.11884/HPLPB202234.220131

Citation:

Liu Ying, Jiang Tao, Yang Qi, et al. Study on grating feedback characteristics of distributed feedback quantum cascade laser[J]. High Power Laser and Particle Beams, 2022, 34: 111005. doi: 10.11884/HPLPB202234.220131

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Study on grating feedback characteristics of distributed feedback quantum cascade laser

doi: 10.11884/HPLPB202234.220131

Key Laboratory of Plasma Physics, Laser Fusion Research Center, CAEP, Mianyang 621900, China

Received Date: 2022-04-28
Accepted Date: 2022-08-26
Rev Recd Date: 2022-06-27

Available Online: 2022-09-16

Publish Date: 2022-09-20

Abstract

Abstract

The grating feedback characteristics of distributed feedback (DFB) quantum cascade lasers with TM mode were simulated by difference time domain method. Comparative analysis was mainly focused on the optical properties of lateral coupled grating and ridge waveguide grating. The causes of differences, the effects of side wall angle on reflection spectrum and loss of grating were also investigated. The results show that the main factor influencing the Bragg wavelength is the effective refractive index, the optical limiting factor is the reason for the great difference of coupling coefficient between the two grating structures, the specular loss is minimum when the side wall angle of the grating is 90°. The relationship between grating period, duty cycle, etching depth and the coupling coefficient shows that the parameters not only affect the relative dielectric constant of grating, but also affects the light limiting factor, thus affecting the coupling coefficient; the coupling coefficient is proportional to the etching depth, and the variation of the coupling coefficient with duty cycle is smaller. Theoretical research on grating optical feedback characteristics is beneficial to improve the understanding of DFB quantum cascade lasers and promote the improvement and development of laser performances.
- quantum cascade laser,
- Bragg grating,
- distributed feedback,
- coupling coefficient,
- TM mode

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References(22)

References

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