Modular infrared microspectrometer with cryosampling capabilities

Fernando Romero-Borja; David L. Schmidt; Lowell T. Wood

doi:10.1364/AO.33.005133

Applied Optics
Vol. 33,
Issue 22,
pp. 5133-5136
(1994)
•https://doi.org/10.1364/AO.33.005133

Modular infrared microspectrometer with cryosampling capabilities

Fernando Romero-Borja, David L. Schmidt, and Lowell T. Wood

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Fernando Romero-Borja, David L. Schmidt, and Lowell T. Wood, "Modular infrared microspectrometer with cryosampling capabilities," Appl. Opt. 33, 5133-5136 (1994)

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Abstract

A modular infrared spectrometer with microsampling and cryosampling capabilities has been designed, constructed, and tested. The main design features and preliminary results are discussed, and some strengths of the final instrument, when used in the optical characterization of superconducting materials, are presented.

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Feature	Description
Light source	Tungsten–halogen lamp with CaF₂ lens.
Beam collimation	Uses a CaF₂ lens at the monochromator exit.
Light chopper	Chopper frequency is in the 1-kHz range. The signal from the sample is detected by lock-in amplification.
Beam polarization	The beam that illuminates the sample can be polarized with a high degree of polarization (≥ 95%) and high transmission of light through the use of a Glan–Thompson and a wire grid polarizer on a CaF₂ substrate as a way to cover the spectral range.
Sample illumination	On-axis illumination by focusing beam at the sample stage of a cryostat.
Signal collection	In the reflection mode, the reflected signal retraces its path back to a ZnS beam splitter and a reflecting microscopic objective. In the transmission mode, the signal goes through the sample and rear window of the cryostat before it is collected on axis and focused onto the detector by a Au-coated ellipsoidal mirror.
Signal detection	Signal is focused onto an Electro-Optical Systems liquid-N₂-cooled Si–InSb sandwich detector; after a prestage amplification it is fed to the lock-in amplifier for computerized spectral data collection.
Camera system	Pulnix color camera with objective and additional beam splitter. This optional feature permits the visual monitoring of the beam-spot geometry and location at the sample stage. It makes possible a preselection of the area on the sample to be scanned.
Cryosampling	Sampling at low temperatures uses either a continuous-flow cryostat or a Joule–Thompson refrigerator at the sample stage with CaF₂ windows, depending on the desired temperature range to cover.

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Applied Optics