Distortion of terahertz pulses in electro-optic sampling

Bakker, Huib J.; Cho, G. C.; Kurz, H.; Wu, Qi; Zhang, X.-C.

doi:10.1364/josab.15.001795

Cited by 165 publications

(89 citation statements)

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“…Note that in the limit of thin crystals ͉͑␣l g + i⌬k g l g ͉ Ӷ 1͒, expression (1) becomes E Trad ϳ T 2 l g . As can be found in the literature, [10][11][12] phase matching in the detection crystal leads to multiplication of the incident field with sin ͑ (1) we find that the detected terahertz electric field spectrum is proportional to…”

Section: Modelsupporting

confidence: 59%

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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Section: Modelsupporting

confidence: 59%

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

et al. 2005

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“…This arrangement does not block or modify most of the THz radiation. The probe laser wavelength can be continuously tuned to provide optimum phase matching between the optical and the THz pulse in the crystal [12]. Experiments are performed at a probe wavelength of 830 nm.…”

Section: Methodsmentioning

confidence: 99%

High-resolution THz spectrometer with kHz scan rates

Bartels¹,

Thoma²,

Janke³

et al. 2006

Opt. Express

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Abstract:We demonstrate a rapid scanning high-resolution THz spectrometer capable of acquiring THz field transients with 1 ns duration without mechanical delay line. The THz spectrometer is based on two 1-GHz Ti:sapphire femtosecond lasers which are linked with a fixed repetition rate difference in order to perform high-speed asynchronous optical sampling. One laser drives a high-efficiency large-area GaAs based THz emitter, the other laser is used for electro-optic detection of the emitted THz-field. At a scan rate of 9 kHz a time resolution of 230 fs is accomplished. High-resolution spectra from 50 GHz up to 3 THz are obtained and water absorption lines with a width of 11 GHz are observed. The use of femtosecond lasers with 1 GHz repetition rate is essential to obtain rapid scanning and high time-resolution at the same time.

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“…Adjusting the optical delay line allows the time-resolved sampling of the terahertz pulses. A more detailed description of the time-resolved sampling of ultra-short terahertz pulses is given in [6,7].…”

Section: Terahertz Imagingmentioning

confidence: 99%

Multi-sensor evaluation of a wooden panel painting using terahertz imaging and shearography

et al. 2009

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Cultural heritage objects are increasingly being investigated using advanced non-destructive optical measurement techniques. Holographic and speckle interferometry based instrumentation allow dimensional measurement of objects at the tens of nanometer scale. For the structural diagnostics of artwork, double-exposure techniques are often used to locate defects, delaminations, voids and other structural features. Shearography is a speckle interferometry configuration that uses a close-to-common-path shearing interferometer configuration to give a direct sensitivity to displacement gradient at the object surface. This configuration is particularly useful for measurements outside the optical laboratory, as the stability requirements are much reduced compared with holography techniques. Terahertz imaging is a new category of sensor, used to investigate materials using electromagnetic radiation in the 0.1 to 10 THz frequency range. At these frequencies many materials become semi-transparent, so bulk structural diagnostics can be performed. Typically terahertz imaging is performed using a scanning pixel, or multi-pixel, sensor. In this manuscript shearography is first used to identify areas of interest of possible structural anomalies in the artwork. These regions of interest are then studied in more detail using the terahertz imaging instrument. Together the two instruments provide an analysis of both the surface and bulk structural features. The approach is demonstrated experimentally using a wooden panel painting.

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Distortion of terahertz pulses in electro-optic sampling

Cited by 165 publications

References 0 publications

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

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

High-resolution THz spectrometer with kHz scan rates

Multi-sensor evaluation of a wooden panel painting using terahertz imaging and shearography

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