Generation of widely tunable Fourier-transform-limited terahertz pulses using narrowband near-infrared laser radiation

Liu, Jinjun; Schmutz, Hansjürg; Merkt, F.

doi:10.1016/j.jms.2009.02.022

Cited by 10 publications

(10 citation statements)

References 62 publications

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“…The excitation scheme is presented in Figure 1 The basic principle of THz generation is similar to that described in Ref. 16 and relies on difference-frequency mixing using two pulsed near-infrared (NIR) lasers, one of which is kept fixed in frequency while the other is tuned, resulting in tunable THz radiation. Narrowbandwidth NIR radiation is produced by two titanium-doped sapphire (Ti:Sa) ring lasers, the cw outputs of which are converted into pulses using two acousto-optical modulators (AOMs) and subsequently pulse-amplified in a bow-tie configuration 25 as shown in The THz spectrometer is depicted in Fig.…”

Section: A Excitation Sequence and Generation Of Thz Radiationmentioning

confidence: 99%

“…The intensities of Rydberg-Rydberg transitions decrease with increasing ∆n value 30 . This decrease is almost entirely compensated by the fact that the power of the THz radiation increases with increasing frequency 16 . The spectra were recorded for several pulse lengths between 10 ns and 400 ns, the latter pulse length resulting in an optimal resolution of ∼3 MHz over the entire THz frequency range.…”

Section: A Pulse Length and Resolutionmentioning

confidence: 99%

“…In this article, we present an extension of a pulsed, laser-based THz radiation source described in Ref. 16 and its integration into a vacuum-ultraviolet-THz (VUV-THz) doubleresonance spectrometer that can be used to study transitions between 0.9 to 14.3 THz with a resolution adjustable between 2.8 and 85 MHz. The source is based on difference-frequency mixing in the nonlinear crystal DAST 17,18 .…”

Section: Introductionmentioning

confidence: 99%

“…The same bow-tie is used for amplification of the two NIR lasers so that the frequency shifts and chirps occuring in the amplification process are identical for both. The amplified NIR pulses are directed into a vacuum chamber where difference-frequency generation takes place in a trans-4 -(dimethylamino)-N -methyl-4-stilbazolium tosylate (DAST) crystal (details on the crystal and the cut used for optimal generation of THz radiation are given in Ref 16…”

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confidence: 99%

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High-resolution laser spectroscopy between 0.9 and 14.3 THz in a supersonic beam: Rydberg-Rydberg transitions of atomic Xe at intermediate n values

Haase

Agner

Merkt

2013

The Journal of Chemical Physics

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A laser-based, pulsed, narrow-band source of submillimeter-wave radiation has been developed that is continuously tunable from 0.1 THz to 14.3 THz. The source is based on difference-frequency mixing in the nonlinear crystal trans-4(')-(dimethylamino)-N-methyl-4-stilbazolium tosylate. By varying the pulse length, the bandwidth of the submillimeter-wave radiation can be adjusted between 85 MHz and 2.8 MHz. This new radiation source has been integrated in a vacuum-ultraviolet-submillimeter-ware double-resonance spectrometer, with which low-frequency transitions of atoms and molecules in supersonic beams can be detected mass-selectively by photoionization and time-of-flight mass spectrometry. The properties of the radiation source and spectrometer are demonstrated in a study of 33f ← nd Rydberg-Rydberg transitions in Xe with n in the range 16-31. The frequency calibration of the submillimeter-wave radiation was performed with an accuracy of 2.8 MHz. The narrowest lines observed experimentally have a full-width at half-maximum of ∼3 MHz, which is sufficient to fully resolve the hyperfine structure of the Rydberg-Rydberg transitions of (129)Xe and (131)Xe. A total of 72 transitions were measured in the range between 0.937 THz and 14.245 THz and their frequencies are compared with frequencies calculated by multichannel quantum defect theory.

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Section: A Excitation Sequence and Generation Of Thz Radiationmentioning

confidence: 99%

Section: A Pulse Length and Resolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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High-resolution laser spectroscopy between 0.9 and 14.3 THz in a supersonic beam: Rydberg-Rydberg transitions of atomic Xe at intermediate n values

Haase

Agner

Merkt

2013

The Journal of Chemical Physics

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“…Recently, we developed a source of THz radiation [10,11], which is based on differencefrequency mixing of near-infrared (NIR) radiation in 4-N,N-dimethylamino-…”

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confidence: 99%

Vibrational spectra of chloroform, freon-11 and selected isotopomers in the terahertz region

Haase

Liu

Merkt

2010

Journal of Molecular Spectroscopy

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The fundamental bands of the CCl 3 asymmetric deformation modes of selected isotopomers of chloroform (CHCl 3 ) and freon-11 (CFCl 3 ) have been measured in a static cell at ambient temperature using a laser-based source of tunable radiation in the terahertz region of the electromagnetic spectrum.The analysis of the rotational contours of the bands enabled the derivation of the fundamental frequencies with an accuracy of better than 3 GHz.Keywords: THz spectroscopy, vibrational spectrum Spectroscopy in the terahertz (THz) region of the electromagnetic spectrum (0.1-10 THz) is challenging because the generation and detection of radiation in this region is difficult. Despite recent progress with radiation sources in the THz region, such as backward-wave oscillators (BWO) We report here a measurement of the absorption spectra of 12 CHCl 3 ,13 CHCl 3 , CDCl 3 and CFCl 3 with natural isotopic abundance of chlorine in the region of the ν 6 fundamental band. This mode is of e symmetry for the C 3v isotopomers but splits into two modes, ν 6 (a ′ ) and ν 9 (a ′′ ), in isotopomers of C s symmetry (we follow the usual convention for numbering the normal modes, see p. 25 of Ref.[20]).The experimental setup was identical to the one described in Ref.[11] and was placed under an N 2 -purged plexiglas cage to reduce water absorption.12 CHCl 3 , 13 CHCl 3 , 12 CDCl 3 and 12 CFCl 3 were supplied by Sigma-Aldrich (≥ 99.5% purity) and used without further purification. A one-meter-long absorption cell with white, ultra-high molecular weight (UHMW) polyethylene windows was filled with 120 mbar ( frequencies of the ν 6 (a ′ ) and ν 9 (a ′′ ) modes calculated ab initio also appear degenerate within the expected precision limit of the method used (see Table 1).

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Molecular crystals and thin films for photonics

Jazbinšek

Günter

2019

Handbook of Organic Materials for Electronic and Photonic Devices

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Generation of widely tunable Fourier-transform-limited terahertz pulses using narrowband near-infrared laser radiation

Cited by 10 publications

References 62 publications

High-resolution laser spectroscopy between 0.9 and 14.3 THz in a supersonic beam: Rydberg-Rydberg transitions of atomic Xe at intermediate n values

High-resolution laser spectroscopy between 0.9 and 14.3 THz in a supersonic beam: Rydberg-Rydberg transitions of atomic Xe at intermediate n values

Vibrational spectra of chloroform, freon-11 and selected isotopomers in the terahertz region

Molecular crystals and thin films for photonics

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