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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.
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Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

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

Continuously tunable optical filter for use in resonance Raman spectroscopy.

D W Collins, R E Cookingham, A Lewis

    Applied Optics
    |February 20, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new tunable optical filter improves laser spectroscopy by precisely removing unwanted light emissions. This filter enhances laser beam polarization for clearer resonance Raman and fluorescence spectroscopy results.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy

    Background:

    • Laser spectroscopy techniques like resonance Raman and fluorescence spectroscopy are crucial for chemical analysis.
    • Undesired light emissions can interfere with spectral measurements, reducing data quality.
    • Existing optical filters may lack tunability or sufficient precision for specific applications.

    Purpose of the Study:

    • To develop and describe a novel tunable optical filter.
    • To enable precise removal of unwanted emissions from laser beams.
    • To enhance the performance of resonance Raman and fluorescence spectroscopy.

    Main Methods:

    • Design of a tunable optical filter with a 1 nm bandpass.
    • Tunability range from 400 nm to 750 nm.
    • Implementation of two independent controls for frequency tuning.
    • Fixed input and output beam directions for operational stability.

    Main Results:

    • The filter effectively removes undesired emissions from laser beams.
    • Achieved a narrow bandpass of 1 nm for high spectral resolution.
    • Demonstrated tunability across a broad spectral range (400-750 nm).
    • Significantly improved the degree of polarization of dye laser beams.

    Conclusions:

    • The described tunable optical filter is a valuable tool for advanced spectroscopic applications.
    • It offers precise spectral filtering and enhanced laser beam quality.
    • The fixed beam path design simplifies integration into existing spectroscopic setups.