Open AccessHybrid high spectral resolution broadband mid-infrared SFG spectrometer development and demonstration
Author(s) -
Karolis Madeikis,
Robertas Kananavičius,
R. Danilevičius,
Audrius Zaukevičius,
Regimantas Januškevičius,
Andrejus Michailovaś
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.433617
Subject(s) - spectrometer , femtosecond , optics , narrowband , picosecond , broadband , materials science , laser , ultrashort pulse , supercontinuum , spectral resolution , sum frequency generation , spectroscopy , infrared , optoelectronics , nonlinear optics , optical fiber , physics , spectral line , photonic crystal fiber , quantum mechanics , astronomy
In this work, we present the development of a femtosecond tunable middle infrared (mid-IR) radiation source for the realization of a hybrid concept compact broadband high-resolution sum-frequency generation (SFG) spectroscopy system. For the realization of the new concept, we used a two-channel picosecond fiber laser as a seed for narrowband (∼1.5 cm -1 ) and broadband ultrafast radiation sources operating at 1 kHz repetition rate. In order to achieve >500 cm -1 bandwidth widely tunable microjoule level pulses in the mid-IR spectral region (2-10 µm), broadband femtosecond source optimization was performed. Numerical simulations with different nonlinear crystals and optical parametric amplification layouts at given fixed initial conditions paved a way to experimentally realize an optimal scheme for a femtosecond mid-IR channel. Fully operating SFG spectrometer setup was assembled and tested. The developed SFG spectrometer demonstrates a unique combination of parameters: excellent spectral resolution (<3 cm -1 ) similar to a narrowband scanning picosecond spectrometers and fast simultaneous acquisition of broadband spectra up to more than 850 cm -1 .