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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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: Overview01:20

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 the...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Multipass prism monochromator for coherent Raman spectroscopy.

T L Gausiran Ii, R H Taylor, J L Higdon

    Applied Optics
    |June 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel multipass prism monochromator effectively separates laser beams. This tunable device offers tunable resolution and high throughput, crucial for advanced coherent Raman spectroscopy applications.

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    Area of Science:

    • Optics and Spectroscopy
    • Laser Physics

    Background:

    • Laser beam separation is critical for many spectroscopic techniques.
    • Existing methods may lack tunability or sufficient resolution.
    • Coherent Raman spectroscopy requires precise wavelength control and high signal-to-noise ratios.

    Purpose of the Study:

    • To describe a novel multipass Brewster prism monochromator.
    • To evaluate its performance as an effective laser beam separator.
    • To assess its suitability for coherent Raman spectroscopy.

    Main Methods:

    • Utilizing a multipass configuration with a Brewster prism.
    • Characterizing resolution, throughput, and tunability.
    • Measuring the extinction coefficient at various detunings.

    Main Results:

    • Achieved a resolution of 4 cm⁻¹ with 63% throughput for fourteen passes.
    • Demonstrated trade-off between resolution and throughput with varying passes.
    • Reported a tunable device with an extinction coefficient of 2 x 10⁻⁸ at 200 cm⁻¹ detuning.

    Conclusions:

    • The multipass prism monochromator is an effective laser beam separator.
    • The device's tunable nature and performance metrics make it valuable for coherent Raman spectroscopy.
    • Offers a promising tool for enhancing spectroscopic investigations.