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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....
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...
An experimental demonstration of a Moire RBG recorded in PTR glass is described. Two shifted RBGs, having respectively central wavelengths at 1547.2 and 1547.4 nm, were holographically recorded in the same plate of PTR glass using expended beams from a He-Cd laser. Then, the sample was developed for 1 hour at 515 degC. After heat-treatment the sample was cut and polished to thickness equal to 6 mm...
We developed a compact, narrow-linewidth diode-pumped Yb:YAG laser with volume Bragg grating delivering stable TEM00-mode Q-switched pulses at 1030 nm with average output of 1 W at 10 kHz and linewidth of < 0.08 nm.
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...
Spectral narrowing of Ti:sapphire down to two longitudinal modes has been achieved in the 3 W pump power range and 200 mW output using a compact design. Further improvements leading to single mode operation are discussed.
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