Abstract
Fast and sensitive Raman spectroscopy measurements are imperative for a large number of applications in biomedical imaging, remote sensing and material characterization. Stimulated Raman spectroscopy offers a substantial improvement in the signal-to-noise ratio but is often limited to a discrete number of wavelengths. In this report, by introducing an electronically-tunable acousto-optical filter as a wavelength selector, a novel approach to a broadband stimulated Raman spectroscopy is demonstrated. The corresponding Raman shift covers the spectral range from 600 cm−1 to 4500 cm−1, sufficient for probing most vibrational Raman transitions. We validated the use of the new instrumentation to both coherent anti-Stokes scattering (CARS) and stimulated Raman scattering (SRS) spectroscopies.
Highlights
MethodsWas sent to an optical parametric amplifier (OPA, a heated 20-mm LiB3O5, LBO), and would be served as seed photons (at idler’s side)
Our AOTF allows its output to be separately controlled by different channels, making it possible to accommodate the SRGOLD scheme
We have demonstrated a simple and efficient approach to preparing laser sources suitable for coherent Raman spectroscopy
Summary
Was sent to an optical parametric amplifier (OPA, a heated 20-mm LiB3O5, LBO), and would be served as seed photons (at idler’s side). The underlying physical principle ensures the frequencies of the signal, idler and the pump to follow the relationship: ωsignal + ωidler = ωpump. Both the amplified signal and idler emissions were in a pulsed manner, and their pulse durations matched the 532 nm pump (i.e., the 1064 nm fundamental laser). The third part of 1064 nm pulses was combined with the output of the OPA (signal, or idler). The transmitted photons, including the pump, Stokes, and CARS components, were collected by another spherical lens. We employed the photodiode to receive 1064 nm emissions (stimulated Raman gain), and used the spectrometer to record the strength of the CARS signal. When recording CARS signal, the spectrometer was running in an accumulation mode so that the CARS signal could be completely recorded by the end of the sweeping procedure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
