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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CD_P36

Influence of the acceptance bandwidth on frequency doubling of ps pulses in a ppMgO:LN ridge waveguide

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Abstract

Green laser light sources emitting picosecond (ps) pulses (τFWHM < 200 ps) at arbitrary repetition rates in the MHz range with a moderate pulse energy (E > 50 pJ) and a good beam quality (M2≈1) are desired for applications such as time-resolved fluorescence spectroscopy. Frequency doubling of gain-switched near-infrared (NIR) diode lasers in a nonlinear crystal enables the generation of suitable ps pulses in this spectral region [1]. However, even gain-switched distributed-feedback (DFB) lasers have relatively broad spectra [1], so the acceptance bandwidth of the second-harmonic generation (SHG) process has to be kept large. This limits the crystal length and the corresponding conversion efficiency [1]. Waveguide structures feature a much higher conversion efficiency than bulk crystals at an equal length and are therefore better suited for frequency doubling of spectrally broad radiation.

© 2011 Optical Society of America

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