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Raman Spectroscopy Instrumentation: Overview

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

Raman Spectroscopy: Overview

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...

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Related Experiment Video

Updated: Jun 6, 2025

Implementation of a Coherent Anti-Stokes Raman Scattering CARS System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

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Single-shot single-beam coherent Raman scattering thermometry based on optically induced air lasing.

Xu Lu^1,2, Yewei Chen^1,3, Francesco Mazza⁴

¹State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.

Light, Science & Applications

|November 24, 2024

Summary

A new single-shot, single-beam coherent Raman scattering (SS-CRS) thermometry method uses air lasing for high-speed temperature measurements. This technique offers high signal-to-noise ratio and repeatability for dynamic combustion and plasma studies.

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Area of Science:

Physics
Optical diagnostics
Spectroscopy

Background:

Accurate, fast, and easy-to-implement thermometric techniques are crucial for studying dynamic combustion, transient reacting flows, and non-equilibrium plasmas.
Existing methods may face limitations in speed, accuracy, or complexity for these demanding applications.

Purpose of the Study:

To develop a novel single-shot, single-beam coherent Raman scattering (SS-CRS) thermometry technique.
To utilize air lasing as a probe for enhanced signal quality and measurement speed.

Main Methods:

Development of a single-shot, single-beam coherent Raman scattering (SS-CRS) system.
Integration of air lasing as a probe beam to enhance the signal-to-noise ratio.
Validation of the SS-CRS thermometry across various temperatures.

Main Results:

The air-lasing-assisted SS-CRS demonstrated a high signal-to-noise ratio, enabling single-shot measurements at a 1 kHz repetition rate.
The SS-CRS thermometry achieved a precision of less than 2.3%, with inaccuracy increasing at higher temperatures.
Unique characteristics of air lasing facilitated high measurement repeatability and a fast acquisition rate.

Conclusions:

The developed SS-CRS thermometry, powered by air lasing, provides a novel and effective approach for high-speed temperature measurements.
This technique holds significant potential for advanced diagnostics in transient reacting flows and plasmas.
The ease of implementation and high performance open new avenues for rapid thermometric analysis.