Dispersive optical delay line and use thereof for the compressio

Details Dispersive optical delay line and use thereof for the compressio Dispersive optical delay line and use thereof for the compressio

1994-05-18

1997-02-11

Dzierzynski, Paul M.

Optical: systems and elements

Diffraction

From grating

359615, 359831, 372 25, 372700, G02B 504

Patent

active

056026773

ABSTRACT:
A dispersive, optical delay line for frequency modulated light wave pulses, especially laser waves, comprises a first optical grating and a second optical grating that are parallel to each other, separated by a distance d and localized with a pitch a on the surface of a material that has an index N and is transparent to light waves. An incident wave .SIGMA. is diffracted at an angle .theta.' greater than the limit angle of refraction by transmission through the first and second optical gratings, the angle of emergence from the second grating being also equal to .theta.'. The values of the parameters N, .theta.', a and d are chosen so that a variation in delay time .DELTA.t.sub.R of the pulse through the line corresponds to a modulation bandwidth .DELTA.f of the pulse in a quasi-linear domain. Application to compression/expansion to obtain high-power or very short laser pulses.

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C. Shank, et al., "Compresion of Femtosecond Optical Pulses", Appl. Phys. Lett., vol. 40, No. 9, 1 May 1982, pp. 761-763.
IEEE Journal of Quantum Electronics. vol.QE-5, No. 9, Sep., 1969, pp. 454-458 "Optical Pulse Compression with Diffraction Gratings", E. B. Treacy.

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