Open AccessOptical parametric amplification in silicon nitride waveguides for coherent Raman imaging
Author(s) -
Niklas M. Lüpken,
Thomas Würthwein,
Klaus-J. Boller,
Carsten Fallnich
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.418052
Subject(s) - four wave mixing , optics , supercontinuum , narrowband , raman scattering , optoelectronics , waveguide , wavelength , materials science , raman amplification , nonlinear optics , signal (programming language) , laser , raman spectroscopy , physics , photonic crystal fiber , computer science , programming language
We present tunable waveguide-based optical parametric amplification by four-wave mixing (FWM) in silicon nitride waveguides, with the potential to be set up as an all-integrated device, for narrowband coherent anti-Stokes Raman scattering (CARS) imaging. Signal and idler pulses are generated via FWM with only 3 nJ pump pulse energy and stimulated by using only 4 mW of a continuous-wave seed source, resulting in a 35 dB enhancement of the idler spectral power density in comparison to spontaneous FWM. By using waveguides with different widths and tuning the wavelength of the signal wave seed, idler wavelengths covering the spectral region from 1.1 µm up to 1.6 µm can be generated. The versatility of the chip-based FWM light source is demonstrated by acquiring CARS images.