Tunable far-infrared spectroscopy

Evenson, K. M.; Jennings, D. A.; Petersen, F. R.

doi:10.1063/1.94845

Cited by 160 publications

(66 citation statements)

References 15 publications

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“…High resolution spectroscopy was first extended into the submillimeter spectral region by means of nonlinear harmonic generation 3 and the technique extended by the introduction of sensitive helium temperature detectors 19 and improved harmonic generator design. 20 Nonlinear techniques have also been used to generate difference frequencies between optical lasers [21][22][23] and to produce microwave sidebands on far infrared ͑FIR͒ laser sources. 24,25 Additionally, a number of solid state diode sources have been extended to higher frequency.…”

Section: B Current Spectroscopic Practice: the Source And Detector Pmentioning

confidence: 99%

A fast scan submillimeter spectroscopic technique

Petkie¹,

Goyette²,

Bettens³

et al. 1997

Review of Scientific Instruments

148

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A new fast scan submillimeter spectroscopic technique ͑FASSST͒ has been developed which uses a voltage tunable backward wave oscillator ͑BWO͒ as a primary source of radiation, but which uses fast scan (ϳ10 5 Doppler limited resolution elements/s͒ and optical calibration methods rather than the more traditional phase or frequency lock techniques. Among its attributes are ͑1͒ absolute frequency calibration to ϳ1/10 of a Doppler limited gaseous absorption linewidth (Ͻ0.1 MHz, 0.000 003 cm Ϫ1 ), ͑2͒ high sensitivity, and ͑3͒ the ability to measure many thousands of lines/s. Key elements which make this system possible include the excellent short term spectral purity of the broadly (ϳ100 GHz) tunable BWO; a very low noise, rapidly scannable high voltage power supply; fast data acquisition; and software capable of automated calibration and spectral line measurement. In addition to the unique spectroscopic power of the FASSST system, its implementation is simple enough that it has the prospect of impacting a wide range of scientific problems.

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Section: B Current Spectroscopic Practice: the Source And Detector Pmentioning

confidence: 99%

A fast scan submillimeter spectroscopic technique

Petkie¹,

Goyette²,

Bettens³

et al. 1997

Review of Scientific Instruments

148

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“…In 1980s, Evenson and coworkers succeeded in generating THz radiation as a beat frequency of two CO 2 lasers (Evenson et al 1984). They used a primitive point-contact diode, touching sharpened tungsten wire on a Ni or Co substrate.…”

Section: Fir Lasermentioning

confidence: 99%

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

Tanaka

Harada

Yamada

2011

Handbook of High‐resolution Spectroscopy

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This article reviews the recent progress of terahertz (THz) and submillimter‐wave (SMMW) spectroscopy in the frequency range of 10–300 cm −1 and its application to the study of weakly bound molecular complexes. The first section describes the light sources used for generating THz radiation, which includes the backward‐wave oscillators (BWO), the multipliers with the GaAs monolithic membrane diode (MOMED), and the supperlattice electronic devices (SLED), as well as the tunable far infrared (TuFIR) lasers. In the following section, we introduce extremely sensitive spectrometers developed for observing very weakly bound molecular complexes, such as the intra‐cavity OROTRON spectrometer and the millimeterwave‐Fourier transform microwave (MMW‐FTMW) double resonance spectrometer. We also review the traditional millimeter‐wave spectrometers, electric‐resonance optothermal spectrometers (EROS), and the tunable far‐infrared (TuFIR) laser spectrometers, which have also been applied successfully to study weakly bound molecular complexes. In the last section, the recent topics of the THz and millimeterwave spectroscopy of molecular complexes are reviewed in the four subsections; (i) Rare gas‐molecule complexes: Rg‐HX, Rg‐CO, and Rg‐HCN, (ii) dimers: (CO) 2 , CO‐N 2 , HCN‐H 2 , and (H 2 O) 2 , (iii) water complexes (H 2 O) n , with n up to 6, and (iv) ion and radical complexes: ArSH, ArH 2 O, H 2 OHO 2 , and ArH 3 + .

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“…In fact, although the need of a complex structure to enable population inversion in electronic band−gap, QCLs supply high output powers, even in C.W. operation, even close up to room temperature operation, at frequencies from 1 THz up, with tune−able laser narrow line [85][86].…”

Section: Sourcesmentioning

confidence: 99%

New frontiers for infrared

Corsi

2015

Opto-Electronics Review

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ÀbstractInfrared (IR) science and technology has been mainly dedicated to surveillance and security: since the 70’s specialized techniques have been emerging in thermal imaging for medical and cultural heritage diagnostics, building and aeronautics structures control, energy savings and remote sensing. Most of these applications were developed thanks to IR FPAs sensors with high numbers of pixels and, actually, working at room temperatures. Besides these technological achievements in sensors/ receivers, advanced developments of IR laser sources up to far IR bands have been achieved in the form QCL (quantum cascade laser), allowing wide band TLC and high sensitivity systems for security. recently new sensors and sources with improved performances are emerging in the very far IR region up to submillimeter wavelengths, the so called terahertz (THz) region.A survey of the historical growth and a forecast of the future developments in Devices and Systems for the new frontier of IR will be discussed, in particular for the key questions: “From where and when is IR coming?”, “Where is it now?” and “Where will it go and when?”. These questions will be treated for key systems (Military/Civil), key devices (Sensors/ Sources), and new strategic technologies (Nanotech/TeraHertz).

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Tunable far-infrared spectroscopy

Cited by 160 publications

References 15 publications

A fast scan submillimeter spectroscopic technique

A fast scan submillimeter spectroscopic technique

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

New frontiers for infrared

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