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Random distributed feedback (DFB) fiber lasers have attracted a great attention since first demonstration [1]. Despite big advance in practical laser systems, random DFB fiber laser spectral properties are far away to be understood or even numerically modelled. Up to date, only generation power could be calculated and optimized numerically [1,2] or analytically [3] within the power balance model....
All-normal dispersion fiber lasers mode-locked due to the effect of nonlinear polarization evolution (NPE) are simple and efficient tools for generation of pulses with different duration. These lasers feature reliable design and resistance to power damage, they can produce relatively high pulse energies without wave breaking and are able to operate in a variety of lasing regimes [1]. Besides generation...
Recently, temporal and statistical properties of quasi-CW fiber lasers have attracted a great attention. In particular, properties of Raman fiber laser (RFLs) have been studied both numerically and experimentally [1,2]. Experimental investigation is more challengeable, as the full generation optical bandwidth (typically hundreds of GHz for RFLs) is much bigger than real-time bandwidth of oscilloscopes...
Record-short pulses of 200 fs have been obtained from a power-scalable-Yb-fiber-CPA system that uses chirped-volume-Bragg-gratings for the stretcher and compressor. The power was scaled up to 50 W with a corresponding 33 W of compressed power.
The use of volume Bragg gratings (VBGs) recorded in photo-thermo-refractive (PTR) glass for laser beam control is described. These new optical elements provide extremely narrow spectral and angular selectivity and have a high level of resistance to high-power pulsed and continuous-wave laser radiation. These features of PTR volume gratings are used for transverse and longitudinal mode selection, passive...
Laser system power can be increased using volume Bragg gratings in PTR glass to combine multiple beams into a near-diffraction-limited beam. We present results of combining five fiber lasers and show achievability of multi-kW-level systems.
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