101.3 kW industrial fiber laser emitting at wavelength range 1070 nm would be presented. To the best of our knowledge, this is the most powerful continuous-wave laser system ever developed all over the world for industrial applications. Other unique features of the laser include a record wall-plug power consumption efficiency 35.4% and an excellent beam quality, with BPP not exceeding 16 mm x mrad, when we used 300 um x 10 m feeding fiber, or near 25 mm x mrad, when fiber-to-fiber output coupler with 500 um x 50 m process fiber was used. Laser cabinet has compact dimensions, whereas a total weight doesn't exceed 3600 kg. Possible applications of such systems and further opportunities of power increase of fiber lasers would be discussed also.
We achieved a 0.2nm linewidth output at 1178nm with powers up to 6.4W in a linear 80m Bismuth-doped fiber cavity pumped by a 55W Yb fibre laser. The potential of frequency doubling of the non-polarized output at 1178nm in MgO doped periodically poled lithium niobate was demonstrated and resulted in 125mW average power at 589nm. The approach can be extended to a linearly-polarized large mode area format with under 0.1nm linewidth capable of scaling to Watts level in the 560-620nm range.
In this paper, we report the mode area scaling of a rare-earth doped step index fiber by using low numerical aperture. Numerical simulations show the possibility of achieving an effective area of ~700um 2 (including bend induced effective area reduction) at a bend diameter of 32cm from a 35μm core fiber with a numerical aperture of 0.038. An effective single mode operation is ensured following the criterion of the fundamental mode loss to be lower than 0.1dB/m while ensuring the higher order modes loss to be higher than 10dB/m at a wavelength of 1060nm. Our optimized modified chemical vapor deposition process in conjunction with solution doping process allows fabrication of an Yb-doped step index fiber having an ultra-low numerical aperture of ~0.038. Experimental results confirm a Gaussian output beam from a 35μm core fiber validating our simulation results. Fiber shows an excellent laser efficiency of ~81% and a M 2 less than 1.1. 2015 Optical Society of America OCIS codes: (060.2280) Fiber design and manufacturing; (140.3510) Fiber lasers.
Power scaling of high-power single-mode fiber lasers is limited primarily by three inter-dependent obstacles: Insufficient-pump-brightness, excess-heat-generation, and non-linearities in the fiber. In this paper, we review these challenges and describe a novel pumping approach which serves to overcome them. Article not available.
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