Open AccessLow-frequency multiplex CARS microscopy with a high-repetition near-infrared supercontinuum laser
Author(s) -
Yusuke Arashida,
Atsushi Taninaka,
Takehiko Ochiai,
Hiroyuki Mogi,
Shoji Yoshida,
Masamichi Yoshimura,
Osamu Takeuchi,
Hidemi Shigekawa
Publication year - 2021
Publication title -
applied physics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.911
H-Index - 94
eISSN - 1882-0786
pISSN - 1882-0778
DOI - 10.35848/1882-0786/ac39b1
Subject(s) - wavenumber , supercontinuum , optics , materials science , raman scattering , raman spectroscopy , laser , green laser , infrared , wavelength , optoelectronics , physics , photonic crystal fiber
We have developed a multiplex coherent anti-Stokes Raman scattering microscope effective for low-wavenumber measurement by combining a high-repetition supercontinuum light source of 1064 nm and a near-infrared high-sensitivity InGaAs diode array. This system could observe the low-wavenumber region down to 55 cm −1 with high sensitivity. In addition, using spectrum shaping and spectrum modulation techniques, we simultaneously realized a wide bandwidth (<1800 cm −1 ), high wavenumber resolution (9 cm −1 ), high efficiency, and increasing signal-to-noise ratio by reducing the effect of the background shape in the low-wavenumber region. Spatial variation of a sulfur crystal phase transition with metastable states was visualized.