Generation of 3.5 W of diffraction-limited green light from SHG of a single tapered diode laser in a cascade of nonlinear crystals

Anders Kragh Hansen, Ole Bjarlin Jensen, Bernd Sumpf, Götz Erbert, Angelika Unterhuber, Wolfgang Drexler, Peter E. Andersen, Paul Michael Petersen

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Abstract

Many applications, e.g., within biomedicine stand to benefit greatly from the development of diode laser-based multi- Watt efficient compact green laser sources. The low power of existing diode lasers in the green area (about 100 mW) means that the most promising approach remains nonlinear frequency conversion of infrared tapered diode lasers. Here, we describe the generation of 3.5 W of diffraction-limited green light from SHG of a single tapered diode laser, itself yielding 10 W at 1063 nm. This SHG is performed in single pass through a cascade of two PPMgO:LN crystals with re-focusing and dispersion compensating optics between the two nonlinear crystals. In the low-power limit, such a cascade of two crystals has the theoretical potential for generation of four times as much power as a single crystal without adding significantly to the complexity of the system. The experimentally achieved power of 3.5 W corresponds to a power enhancement greater than 2 compared to SHG in each of the crystals individually and is the highest visible output power generated by frequency conversion of a single diode laser. Such laser sources provide the necessary pump power for biophotonics applications, such as optical coherence tomography or multimodal imaging devices, e.g., FTCARS-OCT, based on a strongly pumped ultrafast Ti:Sapphire laser.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages6
Volume8964
PublisherSPIE - International Society for Optical Engineering
Publication date2014
DOIs
Publication statusPublished - 2014
EventSPIE Photonics West : Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII - San Francisco, California, United States
Duration: 1 Feb 20146 Feb 2014

Conference

ConferenceSPIE Photonics West : Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII
CountryUnited States
CitySan Francisco, California
Period01/02/201406/02/2014
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume8964
ISSN0277-786X

Bibliographical note

Copyright 2014 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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