High power wavelength-stabilized 976nm diode lasers attract more attention recently with the development of higher power, higher efficiency and higher brightness fiber lasers. The wide spectrum of a high-power diode laser without wavelength stabilization (about 5 nm), together with thermal shift at about 0.3 nm/°C, strongly limits the conversion efficiency benefits at 976 pumping. In this paper, we will report the development of kilowatt wavelength-stabilized CW and QCW diode lasers at BWT.
With certain emitter beam quality and BPP allowed by fiber, we have derived a spatial beam combination structure that approaches the BPP limit of the fiber. Using the spatial beam combination structure and polarization beam combination, BWT has achieved 1.1KW output from a fiber (one end coated) with NA 0.22 and core diameter of 200μm. The electro- optical efficiency is nearly 47%. Multiple emitters with wavelength of 976nm are packaged in a module with size of 600 ×350×80mm3.
With continuous increase in output power of fiber lasers, small volume, low weight, high electro-optic efficiency and high brightness diode laser pump source has become the trend of development. Using spatial beam combining and polarization beam combining methods, BWT has developed a compact pump laser achieving 600W level out of a fiber of 0.22 NA and 200 μm core diameter. At 12A, electro-optical efficiency is higher than 49%. Its brightness is higher than that of the commercially available 158W pump from BWT.
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