Broadband Coherent Raman Scattering: Excitation Architectures and Operating Regimes.

Area of Science:

• Spectroscopy
• Chemical Imaging
• Biophysics

Background:

• Coherent Raman scattering (CRS) techniques, including coherent anti-Stokes Raman scattering (CARS), offer superior chemical specificity and signal intensity compared to spontaneous Raman scattering (SpRS).
• Broadband excitation in CRS enables multiplex detection across broad spectral regions, crucial for analyzing complex chemical and biological samples.

Purpose of the Study:

• To provide a structured overview of excitation architectures for broadband CRS.
• To organize the discussion around key design parameters influencing operating regimes.
• To present reviewed architectures as a complementary toolbox for application-driven spectroscopy.

Main Methods:

• Review of excitation architectures, from low-energy oscillators to energy-scalable platforms.
• Analysis of design parameters: spectral bandwidth, excitation intensity, and probe delay.
• Demonstration of an OPCPA-based implementation for assessing performance.

Main Results:

• Broadband CRS architectures provide significant signal advantages over SpRS.
• Key design parameters dictate accessible spectroscopic operating regimes.
• An OPCPA platform demonstrates single-shot stability and multiplex detection capabilities.

Conclusions:

• Broadband CRS architectures are essential for advanced chemical analysis.
• The reviewed architectures form a versatile toolbox for diverse spectroscopic applications.
• CRS techniques are well-suited for analyzing chemically reactive and biological systems.