We present an experiment in which intracavity optical power spectra of a Raman fiber laser are precisely measured both in the forward and in the backward propagation directions near the cavity mirrors. The statistical properties of the intracavity Stokes field are found to be very different before and after reflection on the cavity mirrors. The influence of both the dispersion and the spectral filtering actions of fiber Bragg grating mirrors are discussed.
We present a bi-directionally 793-nm diode-pumped Tm3+, Ho3+-codoped silica polarization maintaining double-clad all-fiber laser based on a single-oscillator architecture emitting 195 W at 2.09 µm in continuous wave mode of operation, with a beam quality near the diffraction limit (M2 = 1.08). The power scaling of the laser is only pump-power-limited in the range of the total available pump power (540 W).
We show, from experiments and numerical simulations, that dispersion of fiber Bragg grating (FBG) mirrors influences the formation of the optical power spectrum of Raman fiber lasers by shifting the cavity zero-dispersion wavelength inside the FBG reflectivity bandwidth. This results in a spectrum asymmetry, which is well described from a master equation including a third-order dispersion term.
A bidirectional 793 nm diode-pumped actively Q-switched Tm 3+ , Ho 3+-codoped silica polarization-maintaining (PM) double-clad (DC) fiber laser is reported. With this fiber laser, 55 W of average output power with 100 ns pulse width at 200 kHz repetition rate and 2.09 µm wavelength is obtained. The pump power injection with end-caps fusion-spliced on fiber tips provides good power stability (< 1.1%) and beam quality factors (M 2 < 1.7). The fiber laser output beam polarization factor is 97.5%. At 55 W, no thermal-induced damage is observed on any optical element, and power scaling of the laser is only pump-power-limited in the range of the total available pump power (180 W).
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