120W, NA_0.15 fiber coupled LD module with 125-µm clad/NA 0.22 fiber by spatial coupling method

Yuta Ishige; Eisaku Kaji; Etsuji Katayama; Yutaka Ohki; Gábor Gajdátsy; András Cserteg

doi:10.1117/12.2287307

19 February 2018 120W, NA_0.15 fiber coupled LD module with 125-μm clad/NA 0.22 fiber by spatial coupling method

Yuta Ishige, Eisaku Kaji, Etsuji Katayama, Yutaka Ohki, Gábor Gajdátsy, András Cserteg

Proceedings Volume 10514, High-Power Diode Laser Technology XVI; 105140M (2018) https://doi.org/10.1117/12.2287307
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

We have fabricated a fiber coupled semiconductor laser diode module by means of spatial beam combining of single emitter broad area semiconductor laser diode chips in the 9xx nm band. In the spatial beam multiplexing method, the numerical aperture of the output light from the optical fiber increases by increasing the number of laser diodes coupled into the fiber. To reduce it, we have tried the approach to improving assembly process technology. As a result, we could fabricate laser diode modules having a light output power of 120W or more and 95% power within NA of 0.15 or less from a single optical fiber with 125-μm cladding diameter. Furthermore, we have obtained that the laser diode module maintaining high coupling efficiency can be realized even around the fill factor of 0.95. This has been achieved by improving the optical alignment method regarding the fast axis stack pitch of the laser diodes in the laser diode module. Therefore, without using techniques such as polarization combining and wavelength combining, high output power was realized while keeping small numerical aperture. This contributes to a reduction in unit price per light output power of the pumping laser diode module.

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Yuta Ishige, Eisaku Kaji, Etsuji Katayama, Yutaka Ohki, Gábor Gajdátsy, and András Cserteg "120W, NA_0.15 fiber coupled LD module with 125-μm clad/NA 0.22 fiber by spatial coupling method", Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140M (19 February 2018); https://doi.org/10.1117/12.2287307

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