Related Experiment Video
Updated: Apr 16, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Optical Absorption Microspectroscopy (μ-OAS) Based on Schwarzschild-Type Cassegrain Optics
Mathieu Chassé1, Gérald Lelong, Peter van Nijnatten
1Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Sorbonne Universités, Université Pierre et Marie Curie Paris 06, CNRS UMR 7590, IRD UMR 206, Muséum national d'Histoire naturelle, 4 Place Jussieu, F-75005 Paris, France.
Abstract:
A new experimental setup, combining a custom-designed Schwarzschild-type Cassegrain-based microscope and an ultraviolet-visible-near infrared (UV-Vis-NIR) spectrophotometer, has been developed, focusing the light beam down to 20 μm diameter. Optical absorption spectra (in the 300-2500 nm range) have been measured on micrometer-sized natural glass inclusions providing information on iron speciation in magmatic melts. The absence of contribution from the host crystal matrix provides a test of the efficiency of micro-focusing. A microthermometric stage has been adapted on the microscope for measuring optical absorption spectra up to 900 K with application to the thermochromism of minute natural spinel crystals (MgAl2O4:Fe(2+),Cr(3+)). This experimental setup provides an easy and fast way to follow the evolution of spectral properties and color of glasses or crystals with temperature as well as the possibility of measuring spatially resolved optical absorption spectra.
Related Concept Videos
Spectrophotometry: Introduction
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
UV–Vis Spectrometers
Molecular Spectroscopy: Absorption and Emission
Atomic Absorption Spectroscopy: Instrumentation
The atomizer used in AAS can be either a flame atomizer or an...
IR Spectrometers
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

