We have designed a fiber coupling method based on the spatial beam combining of the Photonic Crystal (PC) Laser Diode (LD). The PC LD with a small fast-axis divergence angle makes it possible to reduce the requirements for the numerical aperture and the processing precision of the optical elements, increase the alignment tolerance of components, reduce the difficulty of shaping, and improve the product yield. In the module, there is no need for the collimation of the fast-axis and slow-axis beams, which can be simultaneously focused into the optical fiber through an aspheric cylindrical lens. The simulated results, obtained by the ray tracing method, have shown a coupling efficiency of around 91.4% when the PC LD is coupled into a fiber with a core diameter of 105 μm and the numerical aperture of 0.22. Then, we have performed the experiments, and the coupling efficiency of 71.5% has been achieved. By analyzing the deviation of the simulated and experimental coupling efficiency, we have proposed several solutions. Finally, according to the strategy of this beam shaping, we also list several promising arrangements, which further prove that the beam shaping method possesses broad application prospects.
A tilted wave (TW) laser based on the quasi-periodicity photonic crystal (QPC) structure is studied to improve the maximum power and wall-plug efficiency of laser diodes. In this work, we first use the longitudinal QPC structure instead of the thick passive waveguide compared with previously reported. In order to localize the first order mode, we designed and optimized the longitudinal QPC structure. The optical confinement factor (OCF) of the fundamental mode is only onesixth of the first order mode. In the experiment, a continuous wave power of 12.8 W at 980 nm is achieved with a peak power conversion efficiency of 57.2%. The laser emitted two nearly symmetric narrow vertical beams in far field pattern, which has a full width at half maximum (FWHM) of 7.6° each.
The semiconductor laser diode has the advantage of low cost, high efficiency, and compactness, but the beam divergence is too large to directly use. The phase-locked laser array is an efficient way to control the lateral lasing mode, which can help to achieve narrow farfield.. Though the lasing mode of phase-locked laser array can be an in-phase mode via Ywaveguide, integrated with phase shifter and external cavity, it still has a large side lobe in the farfiled. We demonstrated an on-chip phase and amplitude manipulation method to suppress the side-lobe in the farfield. The intensity of the sidelobes decrease from 0.307 to 0.109 and the integral energy of the main lobe increase from 52.5% to 60.5%
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