A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control.

A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control. Research Abstract Details 

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A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control. Abstract Text:

D G Allen,M S Sherwin,S Takahashi,G Ramian,L Persechini,D G Allen,M S Sherwin,S Takahashi,G Ramian,L Persechini,D G Allen,M S Sherwin,S Takahashi,G Ramian,L Persechini,

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.

A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control. Publishing Authors By Initials

DG Allen,MS Sherwin,S Takahashi,G Ramian,L Persechini,DG Allen,MS Sherwin,S Takahashi,G Ramian,L Persechini,DG Allen,MS Sherwin,S Takahashi,G Ramian,L Persechini,

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A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Review of scientific instruments

VOLUME: 78

Page Numbers: 113103

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ISSN: 0034-6748

DAY: 6

MONTH: Nov

YEAR: 2007

A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control. Information

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LANGUAGE: eng

NlmUniqueID: 405571

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Grant and Affiliation Information for A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control.

AFFILIATION: Department of Physics, University of California, Santa Barbara, California 93106, USA.

Country: United States

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MEDLINETA: Rev Sci Instrum

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