Generation of high-power sub-single-cycle 500-fs electromagnetic pulses

You, D.; Jones, Robert M.; Bucksbaum, P. H.; Dykaar, D. R.

doi:10.1364/ol.18.000290

Cited by 390 publications

(250 citation statements)

References 19 publications

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“…The use of an amplified femtosecond laser system allows the same generation principle described earlier to be scaled up through enlarging the photoconductive antenna gap to a dimension on the order of 1 cm and increasing the bias voltage to several kV. In an early demonstration of this technique, You et al have achieved 0.8 µJ THz pulse energies at 10 Hz repetition rate using semi-insulating GaAs wafers with silver paint electrodes and pulsed bias voltages applied by a spark plug [30]. The maximum THz energies were achieved with an external bias field of 10.7 kV/cm and laser fluencies of 0.1 mJ/cm 2 .…”

Section: 4high Field Pulses Using Large Area Emittersmentioning

confidence: 99%

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Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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Ultrashort terahertz pulses derived from femtosecond table-top sources have become a valuable tool for time-resolved spectroscopy during the last two decades. Until recently, the pulse energies and field strengths of these pulses have been generally too low to allow for the use as pump pulses or the study of nonlinear effects in the terahertz range. In this review article we will describe methods of generation of intense single cycle terahertz pulses with emphasis on optical rectification using the tilted-pulse-front pumping technique. We will also discuss some applications of these intense pulses in the emerging field of nonlinear terahertz spectroscopy.

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Section: 4high Field Pulses Using Large Area Emittersmentioning

confidence: 99%

“…We will first discuss Tz pulse generation using photoconductive switches. Historically, this method was the first one to achieve single-cycle THz pulses with µJ-level pulse energies from an amplified femtosecond laser source [30]. An overview over broadband THz generation using gas plasmas will be given in Section 3.…”

Section: Introductionmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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show abstract

“…The upper plate contains a hole covered by a grid. After interaction with the THz half-cycle pulses, which are produced in a biased large-aperture GaAs antenna illuminated by 800 nm, 100 fs pulses from a regeneratively amplified Ti:sapphire laser system [12], the Rydberg population is probed by state-selective field ionization (SFI). To that end, a slow voltage ramp is applied to the lower capacitor plate.…”

Section: (C)mentioning

confidence: 99%

Transitions Driven by a Missing Frequency

Gürtler

Zande

2004

Phys. Rev. Lett.

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We demonstrate an intricate combination of strong and weak interactions of a broadband half-cycle pulse with Rydberg atoms. A transition, which is resonant with a frequency that was taken out of the frequency spectrum, can be enhanced. In the experiment, the broadband ultrashort terahertz half-cycle pulse propagates through water vapor, which absorbs on discrete lines in the spectrum, thus removing frequencies from the spectrum. The resulting pulse interacts with a rubidium Rydberg atom, which has a resonant transition with one of the missing frequencies. Under certain conditions, the transition probability is enhanced although the associated frequency was missing in the spectrum.

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“…With low repetition rate (10 -1000 Hz) ultrafast laser systems, far-IR pulses with energies as high as 1 µJ have been generated. 65 An external bias field is not strictly necessary for photoconductive generation of terahertz pulses, as real carriers generated by a visible laser pulse can be accelerated in the field of the depletion layer of the semiconductor. This surface field will accelerate the carriers perpendicular to the surface of the semiconductor and hence the terahertz oscillating dipole will be perpendicular to the surface.…”

Section: Terahertz-pulse Generation and Detectionmentioning

confidence: 99%

Ultrafast Laser Technology and Spectroscopy

Reid

Wynne

2000

Encyclopedia of Analytical Chemistry

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Ultrafast laser technology and spectroscopy involves the use of femtosecond (10 −15 s) laser and other (particle) sources to study the properties of matter. The extremely short pulse duration allows one to create, detect and study very short‐lived transient chemical reaction intermediates and transition states. Ultrafast lasers can also be used to produce laser pulses with enormous peak powers and power densities. This leads to applications such as laser machining and ablation, generation of electromagnetic radiation at unusual wavelengths (such as millimeter waves and X‐rays), and multiphoton imaging. The difficulty in applying femtosecond laser pulses is that the broad frequency spectrum can lead to temporal broadening of the pulse on propagation through the experimental set‐up. In this article, we describe the generation and amplification of femtosecond laser pulses and the various techniques that have been developed to characterize and manipulate the pulses.

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Generation of high-power sub-single-cycle 500-fs electromagnetic pulses

Cited by 390 publications

References 19 publications

Intense ultrashort terahertz pulses: generation and applications

Intense ultrashort terahertz pulses: generation and applications

Transitions Driven by a Missing Frequency

Ultrafast Laser Technology and Spectroscopy

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