Optical absorption microspectroscopy (μ-OAS) based on schwarzschild-type cassegrain optics

Mathieu Chasse; Gérald Lelong; Peter van Nijnatten; Ivo Schoofs; Jürgen de Wolf; Laurence Galoisy; Georges Calas

doi:10.1366/14-07628

Optical absorption microspectroscopy (μ-OAS) based on schwarzschild-type cassegrain optics

Mathieu Chasse^*, Gérald Lelong, Peter van Nijnatten, Ivo Schoofs, Jürgen de Wolf, Laurence Galoisy, Georges Calas

^*Corresponding author for this work

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

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:Fe²⁺,Cr³⁺). 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.

Original language	English
Pages (from-to)	457-463
Number of pages	7
Journal	Applied Spectroscopy
Volume	69
Issue number	4
DOIs	https://doi.org/10.1366/14-07628
Publication status	Published - 2015
Externally published	Yes

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title = "Optical absorption microspectroscopy (μ-OAS) based on schwarzschild-type cassegrain optics",

abstract = "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:Fe2+,Cr3+). 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.",

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AU - Chasse, Mathieu

AU - Lelong, Gérald

AU - van Nijnatten, Peter

AU - Schoofs, Ivo

AU - de Wolf, Jürgen

AU - Galoisy, Laurence

AU - Calas, Georges

PY - 2015

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