Compact beam shaping design based on polarization plane multiplexing of semiconductor lasers

Abstract

Fiber coupling is difficult due to the uneven beam parameter product between the vertical and horizontal axes of semiconductor lasers. A beam shaping technique based on the combination of the internal total reflection and polarization surface of a stepped prism is proposed to achieve filling the dark area of the beam and polarization merging, as well as enabling the polarization plane to be multiplexed and the utilization rate of the polarization plane to be increased. The proposed technology can couple three groups of stacked array semiconductor lasers into a single fiber, in which the center diameter is 200 µm, and the numerical aperture is 0.22. The simulation results indicated that the output power of 1099 W and optical-optical conversion productivity of 85.8% were achieved.

Simultaneous polarization and wavelength merging for efficient fiber coupling system using a designed one-mirror prism

“…The two parameters in equation (2) are, in order, the fiber aperture and the vertical aperture. To obtain high coupling efficiency the size and divergence of the spot after focusing need to be smaller than these two parameters respectively [16]. According to the literature [19], the diagonal BPP needs to satisfy the following equation, where f w and s w are the spot waist diameters in two directions, respectively.…”

“…It is shown that a novel shaping prism is proposed, based on which multiple laser stacks distributed around it can be polarized to achieve a combined beam, increasing the final output power and compressing the dead zone of the beam in the vertical direction through the stepped surface of the prism, and finally couples the beam into the target fiber, which has NA = 0.22 and D fiber = 200 μm. The designed prism structure contains multiple stepped surfaces, each with the same slope dimension of less than 1 mm, and the output power of the whole system is 1099 W with an efficiency of 85.8% [16]. It is shown that the beam shaping system is designed by simulation, which consists of 12 singletube lasers of the same wavelength, and the whole design couples the beams in the optical fibers through 12 mirrors and combines them with square polarizing combiner mirrors, and the optical fibers are characterized by an aperture of 105 μm and NA = 0.15 [17].…”

Development of Grating for the Optical Addressing of Sr+ Ions With Data Analysis Techniques

“…[16]. The FWHM is computed at 0.5 of the peaks; while the peak width is computed at 0.135, equivalent to 1/e 2 of the peaks [17]. The typical plots of peak position, peak width, FWHM and E-field along x-and y-axis are shown in Fig.…”