Ms. Hualing Wu Profile

Hualing Wu

at Institute of Applied Electronics

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Proceedings Article | 13 December 2024 Paper

Study on high brightness fiber coupled diode laser through VBG (volume Bragg grating) beam combining

Lanping Zhang, Quanwei Jiang, Hualing Wu, Chengqian Wang, Songxin Gao, Guobin Fan

Proceedings Volume 13492, 134920Z (2024) https://doi.org/10.1117/12.3047785

KEYWORDS: Semiconductor lasers, Fiber coupled lasers, Fiber lasers, Diffraction gratings, Wave equations, Laser applications

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Brightness of single wavelength diode laser is limited to single chip and technology of beam space assembling. In order to improve the brightness of fiber coupled diode laser, two channels wavelength division multiplexing is employed to achieve power increased doubly but BPP (Beam Parameter Product) remained unchanged theoretically. According to Lang-Kobayashi rate equation and Lamb laser equation with external cavity feedback and coupled wave theory, method of spectral locking and Bragg diffraction has been established to support our optical and mechanical design. Laser operated at 976.5nm center wavelength is diffracting and 975.5nm center wavelength is transmitting through beam combing VBG, the spectrum of sub beam is locked to 0.3nm (FWHM), the combing spectrum is 976.5nm±1nm. The diffraction and transmitting efficiency are about 80%, 96% respectively. The power of beam combing can reached at about 800W, and the BPP is less than 15mm·mrad, which indicates that could be coupled to 200μm core diameter fiber, NA (Numerical Aperture) would be less than 0.15. The results could be benefit for high brightness pump source of fiber laser or direct LD (Laser Diode) applications.

Proceedings Article | 4 December 2020 Paper

Spectral beam combination of laser diode with fiber coupled output

Lanping Zhang, Hao Tan, Linhui Guo, Quanwei Jiang, Weichuan Du, Hualing Wu, Bo Fu, Songxin Gao

Proceedings Volume 11617, 116173R (2020) https://doi.org/10.1117/12.2585519

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We researched the external cavity spectral beam combination (SBC) of laser diode (LD) with pigtail output. Two laser diodes with pigtail output, center wavelength of 976nm, and about 45% of electric-to-optical (e-o) conversion efficiency was employed to achieve spectral beam combination. This method demonstrated the feasibility of closed loop SBC of LD with pigtail. The free running spectrum, single laser spectrum with locked wavelength, after combination spectrum were measured. It showed that the spectral width of free running and tunnel range of single laser locked is about 12nm, 6nm respectively. The feedback efficiency of external cavity is about 1.55% when the transmission of cavity output mirror is about 30%. The combination power of 1.63W was obtained, the o-o(optical-to-optical) transferable efficiency is about 25%. The deterioration factor beam quality is about 1.2×, meanwhile, the efficiency loss of SBC and the reason of deterioration of beam quality were analyzed due to the internal loss of external cavity, the transmission loss of grating. In this way, the space stitching, configuration of single chip can transfer to fiber arrangement and organization, due to flexibility and miniaturization of fiber, that will provide a novel thinking for SBC of LD in high power direct application.

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