Abstract
For high power diode laser, the multi-wavelength combining is an effective technology of improving the beam brightness. Based on the combing technology, the diode laser bar is described, with the different sample grating in every emitter ridge, which can have stability of the wavelength and the single longitudinal mode. Mathematics computing model based on the spilt-step fourier (SSF) method combining is built using MatLab. It simulated the multi-wavelength combining process of emitters. In simulation, the diode laser beam successively go through a focus lens and a diffraction grating, respectively. In result, the model accords with the law of the combining which is verified by existing report. The simulation solution satisfied the reported experiment.
Highlights
With high conversion efficiency and minimization, diode laser is widely used in scientific research and industrial application
The ways only change the shape of the diode laser and reduce the beam quality, while they could not meet the need of the better beam quality which is the same to that of a single emitter
We focus on the split-step fourier method [9]
Summary
With high conversion efficiency and minimization, diode laser is widely used in scientific research and industrial application. Several researches of SBC with diode laser bar or arrays have been reported in which the combining are gradually optimized to improve the output characteristic and power. We analyze the beam transmit characteristics and build the combining model in spectral beam combining of laser bar based on the angular spectrum method. The SBC model is built according to the split-step Fourier (SSF) angular spectrum method. In split-step Fourier angular spectrum method [8], z is the step size of beam transmission and the observation-plane field is the reverse Fourier transforms of the product of both the Fourier transforms of the source optical field and transfer function. Every emitter beam of diode laser bar is collimated by FAC and SAC and combined through the focus lens and grating. The path of beam is treated as the integral of split-step small beam path; Every small beam transmission is simulated applying on expression
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