Paper
20 February 2017 Picosecond pulsed micro-module emitting near 560 nm using a frequency doubled gain-switched DBR ridge waveguide semiconductor laser
André Kaltenbach, Julian Hofmann, Dirk Seidel, Kristian Lauritsen, Frank Bugge, Jörg Fricke, Katrin Paschke, Rainer Erdmann, Günther Tränkle
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Abstract
A miniaturized picosecond pulsed semiconductor laser source in the spectral range around 560nm is realized by integrating a frequency doubled distributed Bragg reflector ridge waveguide laser (DBR-RWL) into a micromodule. Such compact laser sources are suitable for mobile application, e.g. in microscopes. The picosecond optical pulses are generated by gain-switching which allows for arbitrary pulse repetition frequencies. For frequency conversion a periodically poled magnesium doped lithium niobate ridge waveguide crystal (PPLN) is used to provide high conversion efficiency with single-pass second harmonic generation (SHG). The coupling of the pulsed radiation into the PPLN crystal is realized by a GRIN-lens. Such types of lenses collect the divergent laser radiation and focus it into the crystal waveguide providing high coupling efficiency at a minimum of space compared to the usage of fast axis collimator(FAC)/slow axis collimator (SAC) lens combinations. The frequency doubled output pulses show a pulse width of about 60 ps FWHM and a spectral width around 0.06nm FWHM at a central wavelength of 557nm at 15‰. The pulse peak power could be determined to be more than 300mW at a repetition frequency of 40 MHz.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
André Kaltenbach, Julian Hofmann, Dirk Seidel, Kristian Lauritsen, Frank Bugge, Jörg Fricke, Katrin Paschke, Rainer Erdmann, and Günther Tränkle "Picosecond pulsed micro-module emitting near 560 nm using a frequency doubled gain-switched DBR ridge waveguide semiconductor laser", Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 1008808 (20 February 2017); https://doi.org/10.1117/12.2250145
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KEYWORDS
Picosecond phenomena

Waveguides

Semiconductor lasers

Waveguide lasers

Distributed Bragg reflectors

Nonlinear crystals

Frequency conversion

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