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Proceedings Paper

Continuous-wave, multi-milliwatt, tunable difference-frequency generation across 4608-4694 nm in orientation-patterned GaP
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Paper Abstract

We report the generation of continuous-wave (cw) tunable mid-infrared (mid-IR) radiation across 4608-4694 nm with multi-tens of mW level output power using difference-frequency-generation (DFG) in the new nonlinear material, orientation-patterned gallium phosphide (OP-GaP). A 40-mm-long OP-GaP (Λ=85.1 μm) is used for DFG, pumped with a cw Tm-fiber laser and a home-built cw Yb-fiber-pumped MgO:PPLN-based optical parametric oscillator (OPO). By varying MgO:PPLN crystal temperature and simultaneously adjusting the phase-matching temperature in OP-GaP, with an input pump power of 34 W at 2010 nm and OPO idler power of >2.9 W across 3505-3557 nm, we achieved DFG tuning across 4608-4694 nm, providing >30 mW of output power across 96% of the full tuning range with 43 mW at 4608 nm. The output at 4608 nm exhibits high beam quality, with a passive power stability of 2.5% rms over 1.5 mins. The performance of the system at high pump powers, temperature acceptance bandwidth, DFG spectral characteristics, and spatial quality has been investigated.

Paper Details

Date Published: 14 May 2018
PDF: 6 pages
Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 1068410 (14 May 2018); doi: 10.1117/12.2306858
Show Author Affiliations
Kavita Devi, ICFO - Institut de Ciències Fotòniques (Spain)
Indian Institute of Technology (India)
A. Padhye, ICFO - Institut de Ciències Fotòniques (Spain)
P. G. Schunemann, BAE Systems, Inc. (United States)
M. Ebrahim-Zadeh, ICFO - Institut de Ciències Fotòniques (Spain)
Institució Catalana de Recerca i Estudis Avançats (Spain)

Published in SPIE Proceedings Vol. 10684:
Nonlinear Optics and its Applications 2018
Benjamin J. Eggleton; Neil G. R. Broderick; Anna C. Peacock, Editor(s)

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