A fast scalable switching technique for high-power CO2 laser radiation

Alcock, A. J.; Corkum, P. B.; James, D. J.

doi:10.1063/1.88336

Cited by 76 publications

(18 citation statements)

References 13 publications

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“…There exist a variety of techniques for terahertz pulse generation and delay based on the timing of optical pulses, including photoactivated semiconductor switches, 12,13 and terahertz generation via ultrafast pulses in nonlinear crystals. 14 When possible, terahertz pulse generation based on optical pulse timing is preferred because optical delay lines do not require diffraction compensation.…”

Section: Tests and Discussionmentioning

confidence: 99%

A diffraction-compensating –25ns free space terahertz delay line for coherent quantum control

Allen

Sherwin

Takahashi

et al. 2007

Review of Scientific Instruments

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Free space delay lines provide pulses of variable time spacing for optical experiments such as pump-probe spectroscopy and coherent quantum control, including spin and photon echo techniques. However, in the terahertz region of the spectrum, beam divergence due to diffraction limits the useful length of traditional free space delay lines. We present a novel double-folded variable delay line for light in the frequency range 0.24-1.2 THz, which incorporates a symmetric arrangement of lenses whose spacing can be adjusted to compensate for diffraction at each delay. Scalable for use in other wavelength regimes, the design relays an input Gaussian beam waist to the output with up to 25 ns ( approximately 8 m) total delay and is enclosed in a desiccated volume of <0.5 m3. The delay line can deliver two or three pulses with relative amplitudes controlled via variable spacing silicon etalon beam splitters. Profiles of a 0.24 THz beam show good agreement with calculations at long delays, with insertion loss per delay stage of approximately 3 dB.

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Section: Tests and Discussionmentioning

confidence: 99%

A diffraction-compensating –25ns free space terahertz delay line for coherent quantum control

Allen

Sherwin

Takahashi

et al. 2007

Review of Scientific Instruments

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“…Although the switch technique has been previously demonstrated, 3 we have extended its use to intracavity FEL output coupling. Not only have short FIR pulses been obtained but high peak powers arc generated by this method.…”

Section: T White and G Ramianmentioning

confidence: 99%

Far-infrared cavity dump coupling of the UC Santa Barbara free-electron laser

Kaminski

Spector

Félix

et al. 1990

Applied Physics Letters

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A Nd:YAG laser-induced semiconductor switch for far-infrared (FIR) radiation was mounted inside a free-electron laser (FEL) wiggler cavity to act as an intracavity output coupler. By timing the FEL to the Q-switched laser, the FIR switch could be turned on during the intracavity laser saturation period. In addition to demonstrating the generation of short, high peak power pulses, the cavity dump coupler (CDC) was used for the first time to image the intracavity mode structure of a FEL and to perform steady-state saturation spectroscopy studies in the FIR.

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“…16,17 The generation of the necessary pulses with a very long turn-on and a very rapid turn-off was, traditionally, quite difficult. The slow turn-on precluded the use of standard liquid crystal or acousto-optic pulse shaping technology, and instead a complex plasma shutter methodology was used, 18 involving nonlinear effects to truncate a long pulse with a synchronized femtosecond pulse. Nevertheless, despite the interest in switched wave packet alignment dynamics and the promises it offers, very few experimental demonstrations were performed.…”

Section: Introductionmentioning

confidence: 99%

Communication: Switched wave packets with spectrally truncated chirped pulses

Chatterley

Karamatskos

Schouder

et al. 2018

The Journal of Chemical Physics

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A new technique for obtaining switched wave packets using spectrally truncated chirped laser pulses is demonstrated experimentally and numerically by one-dimensional alignment of both linear and asymmetric top molecules. Using a simple long-pass transmission filter, a pulse with a slow turn-on and a rapid turn-off is produced. The degree of alignment, characterized by cos 2 θ 2D , rises along with the pulse intensity and reaches a maximum at the peak of the pulse. After truncation, cos 2 θ 2D drops sharply but exhibits pronounced half and full revivals. The experimental alignment dynamics trace agrees very well with a numerically calculated trace based on the solution of the time-dependent Schrödinger equation. However, the extended periods of field-free alignment of asymmetric tops following pulse truncation reported previously are not reproduced in our work. Published by AIP Publishing. https://doi

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A fast scalable switching technique for high-power CO2 laser radiation

Cited by 76 publications

References 13 publications

A diffraction-compensating –25ns free space terahertz delay line for coherent quantum control

A diffraction-compensating –25ns free space terahertz delay line for coherent quantum control

Far-infrared cavity dump coupling of the UC Santa Barbara free-electron laser

Communication: Switched wave packets with spectrally truncated chirped pulses

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