Fiber-Integrated Second Harmonic Generation Modules for Visible and Near-Visible Picosecond Pulse Generation

Fiber-Integrated Second Harmonic Generation Modules for Visible and Near-Visible Picosecond Pulse Generation
Title:
Fiber-Integrated Second Harmonic Generation Modules for Visible and Near-Visible Picosecond Pulse Generation
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SPIE Proceedings
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Publication Date:
27 February 2015
Citation:
Thomas Legg ; Andrew Robertson ; Robert Eckardt ; Timothy Runcorn ; Dora Hu, et al. " Fiber-integrated second harmonic generation modules for visible and near-visible picosecond pulse generation ", Proc. SPIE 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 93470B (February 27, 2015); doi:10.1117/12.2078726; http://dx.doi.org/10.1117/12.2078726
Abstract:
Second harmonic generation (SHG) is a ubiquitous technique for extending the spectral coverage of laser sources into regions that would otherwise be technologically challenging to access. SHG schemes typically rely on the use of bulk optical components, resulting in systems with large footprints requiring precise optical alignment. Integration of the SHG components into a single unit facilitates the implementation of compact, robust and turn-key sources, suitable for applications in biophotonic imaging, amongst others. We report on the development of fiber-coupled frequency doubling modules and their application to novel fiber integrated picosecond pulse sources in the visible and near-visible. The modules employ a simple, single-pass configuration using a periodically-poled lithium niobate (PPLN) crystal as the nonlinear conversion medium. They are readily adaptable for different fiber pump laser configurations and are configurable with either fiber-coupled or collimated free-space outputs. Two sources using the modules are presented, operating at 780 nm and 560 nm. The 780 nm source utilizes an erbium master oscillator power fiber amplifier (MOPFA) scheme. SHG was performed in a 35 mm long crystal, generating 3.5 W of 780 nm radiation with a pulse duration of 410 ps at 50 MHz and conversion efficiencies exceeding 20%. Results of this source being used for parametric wavelength conversion in photonic crystal fiber are discussed. The 560 nm source was based on SHG of a Raman amplified CW diode pumped by a pulsed ytterbium-fiber MOPFA. This source generated 450 mW of average power with conversion efficiencies greater than 20%.
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Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic 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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