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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 the...

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Related Experiment Video

Updated: Jun 22, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

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Published on: January 14, 2020

Colored object recognition by digital holography and a hydrogen Raman shifter.

Percival Almoro, Wilson Garcia, Caesar Saloma

|June 24, 2009

Summary

This summary is machine-generated.

This study demonstrates multi-wavelength holography using a Raman shifter for advanced 3D imaging. The technique enables detailed, full-color object reconstruction and recognition through digital holography.

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Last Updated: Jun 22, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

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Published on: January 14, 2020

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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Area of Science:

Optics and Photonics
Holographic Imaging
Nonlinear Optics

Background:

Traditional holography often limited to single wavelengths.
Need for advanced imaging techniques capable of full-color reconstruction.
Pulsed laser systems offer high intensity and temporal coherence.

Purpose of the Study:

To demonstrate multi-wavelength holography using stimulated Raman scattering.
To achieve digital hologram recording of 2D colored objects.
To enable numerical reconstruction and recognition of colored objects.

Main Methods:

Utilizing a hydrogen (H2) Raman shifter pumped by an elliptically polarized 532 nm laser.
Recording digital holograms using Raman-shifted output lines at 630.4 nm (Red), 532 nm (Green), and 435.7 nm (Blue).
Numerical reconstruction via the convolution method and object recognition using multi-channel correlation.

Main Results:

Generation of temporally coherent, intense, polarized output lines across multiple wavelengths.
Successful digital hologram recording of two-dimensional colored objects.
Accurate colored object recognition achieved through correlation of R, G, B reconstructions.

Conclusions:

Multi-wavelength holography is feasible using Raman-shifted laser lines.
The developed method allows for full-color holographic reconstruction and object recognition.
This technique offers potential for advanced optical metrology and imaging applications.