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18 May 2011 Frequency doubling of picosecond pulses generated by a monolithic DFB tapered MOPA in a ppMgO:LN channel waveguide
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Abstract
In this work, we investigate experimentally second-harmonic generation (SHG) of pulsed near-infrared (NIR) diode laser radiation in a nonlinear crystal with a ridge waveguide structure. Pulses at 1064 nm with a pulse energy of 560 pJ, a peak power of 3.2 W and a pulse length of 138 ps are generated at a repetition rate of 10 MHz by a monolithic DFB (Distributed Feedback) tapered MOPA (Master Oscillator Power Amplifier). For frequency doubling, a periodically poled MgO-doped lithium niobate crystal with a ridge waveguide structure is used. During SHG, a dependence of the second-harmonic (SH) pulse duration on the NIR pulse energy as well as a distinctive influence of the waveguide structure on the beam quality is observed. A maximum SH peak power at 532 nm of 0.75 W and an opto-optical conversion efficiency of 24 % are achieved. Furthermore, an influence of the spectral distribution of the NIR laser radiation on the SHG conversion efficiency is observed.
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D. Jedrzejczyk, S. Riecke, R. Güther, K. Lauritsen, and K. Paschke "Frequency doubling of picosecond pulses generated by a monolithic DFB tapered MOPA in a ppMgO:LN channel waveguide", Proc. SPIE 8071, Nonlinear Optics and Applications V, 80710N (18 May 2011); https://doi.org/10.1117/12.886835
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