S. Jetschke, S. Hagemann, U. Ropke, G.S. v Langeweyde, K. Morl, H. Muller
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Investigation of fiber laser pulses by a fiber-Bragg-grating (FBG) spectrum analyzer
We prepared two fiber-Bragg-gratings (FBG)-arrays for the wavelength range 1074 - 1100 nm, both with a spectral width of 0.1 nm and a reflectivity of about 1% of the individual gratings so that pulses are investigated from an Yb fiber laser, Q-switched by an acousto-optical modulator with a repetition rate of 2.6 kHz. Using FBG-array the development of high spikes over some roundtrips in the fiber laser resonator was observed and spectrally analyzed.
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