Long-wave infrared absorption measurement of undoped germanium using photothermal common-path interferometry

Yu-Jen Lee; Avijit Das; Merlin L. Mah; Joseph J. Talghader

doi:10.1364/AO.390374

Long-wave infrared absorption measurement of undoped germanium using photothermal common-path interferometry

Yu-Jen Lee
, Avijit Das
, Merlin L. Mah
, Joseph J. Talghader

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Germanium is one of the most commonly used materials in the longwave infrared (λ∼8-12 μm), but ironically, its absorption coefficient is poorly known in this range. An infrared photothermal common-path interferometry system with a tunable quantum cascade pump laser is used to measure the absorption coefficient of >99.999% pure undoped germanium as a function of wavelengths between 9 and 11 μm, varying between about 0.15 and 0.45 cm-1 over this range.

Original language	English (US)
Pages (from-to)	3494-3497
Number of pages	4
Journal	Applied Optics
Volume	59
Issue number	11
DOIs	https://doi.org/10.1364/AO.390374
State	Published - Apr 10 2020

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© 2020 Optical Society of America.

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abstract = "Germanium is one of the most commonly used materials in the longwave infrared (λ∼8-12 μm), but ironically, its absorption coefficient is poorly known in this range. An infrared photothermal common-path interferometry system with a tunable quantum cascade pump laser is used to measure the absorption coefficient of >99.999\% pure undoped germanium as a function of wavelengths between 9 and 11 μm, varying between about 0.15 and 0.45 cm-1 over this range.",

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AU - Lee, Yu-Jen

AU - Das, Avijit

AU - Mah, Merlin L.

AU - Talghader, Joseph J.

PY - 2020/4/10

Y1 - 2020/4/10

N2 - Germanium is one of the most commonly used materials in the longwave infrared (λ∼8-12 μm), but ironically, its absorption coefficient is poorly known in this range. An infrared photothermal common-path interferometry system with a tunable quantum cascade pump laser is used to measure the absorption coefficient of >99.999% pure undoped germanium as a function of wavelengths between 9 and 11 μm, varying between about 0.15 and 0.45 cm-1 over this range.

AB - Germanium is one of the most commonly used materials in the longwave infrared (λ∼8-12 μm), but ironically, its absorption coefficient is poorly known in this range. An infrared photothermal common-path interferometry system with a tunable quantum cascade pump laser is used to measure the absorption coefficient of >99.999% pure undoped germanium as a function of wavelengths between 9 and 11 μm, varying between about 0.15 and 0.45 cm-1 over this range.

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UR - https://www.scopus.com/pages/publications/85083081522#tab=citedBy

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JO - Applied Optics

JF - Applied Optics

IS - 11

ER -

Long-wave infrared absorption measurement of undoped germanium using photothermal common-path interferometry

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