Optimal Design and Analysis of Wide-Band Near-Infrared Hybrid Dielectric Gratings with High Transmission Efficiency

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Abstract
Since surface relief transmission gratings have very strict requirements on operators and use environment, according to the semiconductor laser external cavity spectral beam combining system, this paper proposes a design scheme for a semiconductor laser array spectral beam combining system based on the grating-external cavity. The finite element approach was used to create a wideband, high-efficiency fill-in multilayer dielectric transmission grating structure for a high-power spectrum beam combining system. The incidence angle, ridge height, duty cycle, and sidewall inclination angle of the transmission grating were tuned and evaluated, and a link between the transmission grating’s diffraction efficiency and grating characteristics was discovered. The calculated design of the high-power fused silica transmission grating has a negative first-order peak diffraction efficiency of 99.5% in the 800 nm range. In the spectral region of 765–872 nm, the transmission grating’s diffraction effectiveness exceeds 92%. The filled ultra-high diffraction efficiency multilayer dielectric transmission grating design addresses the issue of resistance to high-power lasers under complicated operating settings. It is intended to maintain a high diffraction efficiency even after several cleaning cycles, and it is an ideal component for high-power spectrum beam combining systems.
Funding Information
  • Outstanding Scientific and Technological Talents Project of Jilin Province (20230508097RC, 62090051, 62090052, 62090054, 62121005, 61934003, 62227819, 61935009, 20210301016GX, 20230508097RC, 2022C01108)
  • National Natural Science Foundation of China (20230508097RC, 62090051, 62090052, 62090054, 62121005, 61934003, 62227819, 61935009, 20210301016GX, 20230508097RC, 2022C01108)
  • Science and Technology Development Project of Jilin Province (20230508097RC, 62090051, 62090052, 62090054, 62121005, 61934003, 62227819, 61935009, 20210301016GX, 20230508097RC, 2022C01108)
  • Dawn Talent Training Program of CIOMP (20230508097RC, 62090051, 62090052, 62090054, 62121005, 61934003, 62227819, 61935009, 20210301016GX, 20230508097RC, 2022C01108)
  • “Lingyan” Research Program of Zhejiang Province (20230508097RC, 62090051, 62090052, 62090054, 62121005, 61934003, 62227819, 61935009, 20210301016GX, 20230508097RC, 2022C01108)

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