With the development of fiber lasers, the weight, power and brightness of fiber coupled semiconductor lasers are increasingly required. Low SWAP (low size and weight and power-efficient) laser diode has been a major focus of research. This paper mainly introduces the latest development of BWT low-SWaP products. In 2023, BWT introduces products with a power to mass ratio of 2.3W/g. By optimizing the optical path, increasing the power of the single chip, optimizing the structural design, and changing the material, BWT has introduced a higher brightness low-SWaP wavelength stabilized pumps. relying on a proprietary architecture of spatial and polarization multiplexing with multi-emitters.
With continuously increasing output power of fiber lasers, small volume, lightweight, high electro-optic efficiency fiber laser is needed. The weight of the semiconductor laser accounts for half of the weight of the entire fiber laser. Therefore lower weight high brightness high power diode laser pump source has become the inevitable trend of development. Lightweight need small volume, low density material. Copper and aluminum are commonly used shell materials. Copper has excellent heat dissipation which density is three times that of aluminum. Lightweight need to balance the contradiction between heat dissipation and weight. BWT designed a diode laser pump source which power ratio is 2.3W/g. The shell materials are mainly copper and aluminum. Using spatial beam combination, polarization beam combination, together with 3-dimensional space dense arrangement, lower weight diode was achieved.
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