Electro-optic sampling near zero optical transmission point

Jiang, Zhiping; Sun, F. G.; Chen, Q.; Zhang, Xicheng

doi:10.1063/1.123495

Cited by 115 publications

(69 citation statements)

References 4 publications

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“…In a cubic material such as ZnTe and GaP (with no birefringence ideally) the former can be achieved by making use of a quarter wave plate and the latter by relying on the residual birefringence in the crystals (for instance, due to stress). However, in the shot noise limit both approaches yield a similar signalto-noise ratio (Jiang et al, 1999). (iii) One major advantage of the EO detection method is its time resolution, which is, in principle, limited only by the duration of the optical probe pulse.…”

Section: B Detectionmentioning

confidence: 99%

“…Such a relationship can be linearized around the constant phase ' 0 if ' 0 ) '. A phase shift of ' 0 ¼ =4 is introduced to obtain the greatest absolute modulation in the probe beam intensity for a given THz field strength (Wu and Zhang, 1995;Nahata, Auston, and Heinz, 1996), and a near-zero phase shift is introduced for measurements that benefit from a higher modulation depth of the probe beam (Jiang et al, 1999;Shan et al, 2000). In a cubic material such as ZnTe and GaP (with no birefringence ideally) the former can be achieved by making use of a quarter wave plate and the latter by relying on the residual birefringence in the crystals (for instance, due to stress).…”

Section: B Detectionmentioning

confidence: 99%

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Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy

et al. 2011

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Time-resolved, pulsed terahertz spectroscopy has developed into a powerful tool to study charge carrier dynamics in semiconductors and semiconductor structures over the past decades. Covering the energy range from a few to about 100 meV, terahertz radiation is sensitive to the response of charge quasiparticles, e.g., free carriers, polarons, and excitons. The distinct spectral signatures of these different quasiparticles in the THz range allow their discrimination and characterization using pulsed THz radiation. This frequency region is also well suited for the study of phonon resonances and intraband transitions in low-dimensional systems. Moreover, using a pump-probe scheme, it is possible to monitor the nonequilibrium time evolution of carriers and low-energy excitations with sub-ps time resolution. Being an all-optical technique, terahertz time-domain spectroscopy is contact-free and noninvasive and hence suited to probe the conductivity of, particularly, nanostructured materials that are difficult or impossible to access with other methods. The latest developments in the application of terahertz time-domain spectroscopy to bulk and nanostructured semiconductors are reviewed.

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Section: B Detectionmentioning

confidence: 99%

Section: B Detectionmentioning

confidence: 99%

Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy

et al. 2011

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“…However detection in the cross-polarizer geometry also contains a strong amplitude response that is typically much greater than the intensity response [24]. In this work the amplitude response is completely removed from the cross polarizer signal by using a fast scan and antenna modulation technique described in the Appendix.…”

Section: Measurement Of the Total Emission Of The Qcl In The Cross Pomentioning

confidence: 99%

Measuring the sampling coherence of a terahertz quantum cascade laser

Maysonnave¹,

Jukam²,

Ibrahim³

et al. 2012

Opt. Express

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Abstract:The emission of a quantum cascade laser can be synchronized to the repetition rate of a femtosecond laser through the use of coherent injection seeding. This synchronization defines a sampling coherence between the terahertz laser emission and the femtosecond laser which enables coherent field detection. In this letter the sampling coherence is measured in the time-domain through the use of coherent and incoherent detection. For large seed amplitudes the emission is synchronized, while for small seed amplitudes the emission is non-synchronized. For intermediate seed amplitudes the emission exhibits a partial sampling coherence that is time-dependent. 211-212 (1982). 4. A. Nahata, A. S. Weling, and T. F. Heinz, "A wideband coherent terahertz spectroscopy system using optical rectification and electro-optic sampling," Appl. Phys. Lett. 69(16), 2321-2323 (1996). 5. J. Dai, X. Xie, and X. C. Zhang, "Detection of broadband terahertz waves with a laser-induced plasma in gases," Phys. Rev. Lett. 97(10), 103903 (2006). 6. D. H. Auston and K. P. Cheung, "Coherent time-domain far-infrared spectroscopy," J. Opt. Soc. Am. B 2(4), 606-612 (1985). 7. C. A. Schmuttenmaer, "Exploring dynamics in the far-infrared with terahertz spectroscopy," Chem. Rev. 104(4), 1759-1780 (2004). ©2012 Optical Society of America 41(3),

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“…Although the EO effect onto the probe beam is then small, the balancing allows for strong noise reduction. To resolve the sign of the THz pulse in the single-diode scheme, 38 the / 4 plate was rotated to provide elliptical polarization. It has been shown 38 that in the sign-resolving single-diode configuration, the best signal-to-noise ratio is obtained with a small rotation of the / 4 plate, such that near-zero optical transmission is realized.…”

Section: -5mentioning

confidence: 99%

Terahertz radiation as a bunch diagnostic for laser-wakefield-accelerated electron bunches

et al. 2006

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Experimental results are reported from two measurement techniques ͑semiconductor switching and electro-optic sampling͒ that allow temporal characterization of electron bunches produced by a laser-driven plasma-based accelerator. As femtosecond electron bunches exit the plasma-vacuum interface, coherent transition radiation ͑at THz frequencies͒ is emitted. Measuring the properties of this radiation allows characterization of the electron bunches. Theoretical work on the emission mechanism is presented, including a model that calculates the THz wave form from a given bunch profile. It is found that the spectrum of the THz pulse is coherent up to the 200 m thick crystal ͑ZnTe͒ detection limit of 4 THz, which corresponds to the production of sub-50 fs ͑rms͒ electron bunch structure. The measurements demonstrate both the shot-to-shot stability of bunch parameters that are critical to THz emission ͑such as total charge and bunch length͒, as well as femtosecond synchronization among bunch, THz pulse, and laser beam.

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Electro-optic sampling near zero optical transmission point

Cited by 115 publications

References 4 publications

Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy

Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy

Measuring the sampling coherence of a terahertz quantum cascade laser

Terahertz radiation as a bunch diagnostic for laser-wakefield-accelerated electron bunches

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