Detection of THz pulses by phase retardation in lithium tantalate

Jepsen, Peter Uhd; Winnewisser, C.; Schall, M.; Schyja, V.; Keiding, Søren Rud; Helm, H.

doi:10.1103/physreve.53.r3052

Cited by 132 publications

(52 citation statements)

References 12 publications

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“…First demonstrated for femtosecond electrical transients by Auston and Nuss, 30 the technique was simultaneously demonstrated for the detection of free-space transients by three independent groups. [31][32][33] Electro-optic generation uses the Pockels' effect, where an incident electric field (in this case, the terahertz transient) produces a birefringence in a crystal such as zinc telluride (ZnTe) or gallium phosphide (GaP), thus rotating the phase of the probe laser pulse. Measurement of the relative polarization of the pulse retrieves the magnitude and phase of the terahertz electric field.…”

Section: Techniquesmentioning

confidence: 99%

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

2015

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With the ongoing proliferation of terahertz time-domain instrumentation from semiconductor physics into applied spectroscopy over the past decade, measurements at terahertz frequencies (1 THz [ 10 12 Hz [ 33 cm À1) have attracted a sustained growing interest, in particular the investigation of hydrogen-bonding interactions in organic materials. More recently, the availability of Raman spectrometers that are readily able to measure in the equivalent spectral region very close to the elastic scattering background has also grown significantly. This development has led to renewed efforts in performing spectroscopy at the interface between dielectric relaxation phenomena and vibrational spectroscopy. In this review, we briefly outline the underlying technology, the physical phenomena governing the light-matter interaction at terahertz frequencies, recent examples of spectroscopic studies, and the current state of the art in assigning spectral features to vibrational modes based on computational techniques.

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Section: Techniquesmentioning

confidence: 99%

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

2015

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“…This change is measured in a conventional electro-optic detection setup, leading to an electronic signal proportional to the terahertz electric field. 8 With the above described setup, we performed two sets of measurements. In the first set, the terahertz electric field was measured in three different generation crystals with thicknesses of 0.5, 1, and 4 mm.…”

Section: Measurement Setupmentioning

confidence: 99%

Influence of pump wavelength and crystal length on the phase matching of optical rectification

et al. 2005

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We present measurements on terahertz generation by optical rectification, in which both the thickness of the generation crystal and the wavelength of the generating optical pulse are varied. The difference between the group velocity at optical frequencies and the phase velocity at terahertz frequencies affects the time trace and spectrum of the generated terahertz pulse. For the thickest crystal, we find that the phase mismatch gives rise to the generation of two pulses, separated by 4.5 ps. The physical origin of the observed features is clarified with a simple model that includes phase matching and absorption.

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“…Mourou and his colleagues were the first to employ the EO sampling technique to measure waveforms of electrical transients propagating along microwaves lines [31]. Then the technique was applied to sample freely-propagating THz pulses [32][33][34]. Among the different crystals tested for EO sampling of THz pulse (LiNbO 3 , LiTaO 3 , DAST…), zinc blende crystals like ZnTe and GaP attracted a great attention because of their isotropic behaviour and of the possibility of achieving ZnTe phase-matching between the incoming THz beam and the laser probe beam.…”

Section: State Of the Art In Thz Eo Sampling With Zinc-blende [111] Cmentioning

confidence: 99%

Second order nonlinear optical processes in [111] cubic crystals for terahertz optoelectronics

Gaborit¹,

Sanjuan²,

Coutaz³

2018

physics

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In this paper, we give an overview of emission and detection of terahertz electromagnetic pulses using, respectively, optical rectification and electro-optic effect in [111] zinc blende crystals. This crystal orientation allows us to generate and read any polarization state of the THz beam only by controlling the polarization state of the laser beam that excites or probes the emitting and receiving crystals. This technique is very useful for polarimetric terahertz spectroscopic studies.

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Detection of THz pulses by phase retardation in lithium tantalate

Cited by 132 publications

References 12 publications

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

Influence of pump wavelength and crystal length on the phase matching of optical rectification

Second order nonlinear optical processes in [111] cubic crystals for terahertz optoelectronics

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