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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

High-resolution broadband spectroscopy with a resonator-based phase modulator.

Naum K Berger¹

¹Department of Electrical Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel. chrberg@techunix.technion.ac.il

|July 12, 2013

Summary

This study introduces a novel method using ultrashort laser pulses and a phase modulator to dramatically enhance the spectral resolution of Fabry-Perot resonators, achieving 1 MHz resolution. This technique significantly boosts measurement capabilities for spectral analysis.

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Area of Science:

Optics
Spectroscopy
Interferometry

Background:

Fabry-Perot resonators are crucial for high-resolution spectroscopy.
Enhancing their spectral resolution and measurement range is an ongoing challenge.

Purpose of the Study:

To propose a method for significantly enhancing the spectral resolution of a Fabry-Perot resonator.
To increase the spectral range of measurements using scanning periodic spectra.

Main Methods:

Utilizing ultrashort laser pulses as the optical source.
Incorporating a dispersive element and a phase modulator into the Fabry-Perot resonator.
Employing waveguide arrays of Mach-Zehnder interferometers or discretely tunable interferometers for extended spectral range.

Main Results:

Achieved a finesse increase from 72 to 1900 and a spectral resolution of 1 MHz in numerical simulations.
Demonstrated measurement of sample transmission spectra across 33 free spectral ranges.
Showcased potential for a 10 THz spectral range with an equivalent finesse of 10^7 for 100 fs laser pulses.

Conclusions:

The proposed method offers a significant advancement in Fabry-Perot resonator performance.
This technique enables unprecedented spectral resolution and extended measurement ranges for various applications.
The findings pave the way for more precise spectroscopic analysis.