100-W 105-μm 0.15NA fiber coupled laser diode module

Abstract

We report on the development of a high brightness laser diode module capable of coupling over 100W of optical power into a 105 µm 0.15 NA fiber at 976 nm. This module, based on nLIGHT's Pearl TM product architecture, utilizes hard soldered single emitters packaged into a compact and passively-cooled package. In this system each diode is individually collimated in the fast and slow axes and free-space coupled into a single fiber. The high brightness module has an optical excitation under 0.13 NA, is virtually free of cladding modes, and has an electrical to optical efficiency greater than 40%. Additionally, this module is compatible with high power 7:1 fused fiber combiners, and initial experiments demonstrated 500W coupled into a 220 µm, 0.22 NA fiber. These modules address the need in the market for higher brightness diode lasers for pumping fiber lasers and direct material processing.

Alleviate photo darkening by single-mode RMO fiber design

“…Pump power at 100 W is delivered in a 105 µm 0.15 NA fiber at 976 nm. 13 This gives 5.5 kW available pump power in a 250 µm core diameter which in the present work is found to be more than sufficient in single side pumping. A 7.6 kW pump level is realized by 1018 nm fiber lasers in 210 µm pump cores applied to reach 6 kW single mode output power.…”

940-nm Broad Area Diode Lasers Optimized for High Pulse-Power Fiber Coupled Applications

“…Several emitters may be coupled into a single fiber to utilize the chips for high power applications in the multi-kilowatt range [2]- [4], [8]. As an example we consider a standard fiber with φ = 1 mm and NA = 0.22.…”

Investigation of collimating and focusing lenses’ impact on laser diode stack beam parameter product

“…The sketch of a typical multi-emitter module configuration that makes use of spatial multiplexing is shown in Fig. 1 [6].…”