Optical system for stretching, compressing and amplifying ultras

Details Optical system for stretching, compressing and amplifying ultras Optical system for stretching, compressing and amplifying ultras

1995-05-01

1996-11-05

Hellner, Mark

Optical: systems and elements

Optical amplifier

359346, 359184, 359238, H01S 300, H04B 1004, G02B 2600

Patent

active

055723551

ABSTRACT:
An apparatus for stretching or compressing an ultrashort pulse in time that is free of non-linear and spatial distortion (temporal or spatial frequency chirp) comprises a first diffraction grating G, a concave spherically curved mirror [CCM] with a radius of curvature R.sub.1, a convex spherically curved mirror [CXM] with a radius of curvature R.sub.2, and a flat reflector, [PM]. As a result of propagation of the ultrashort input pulse through this system, the output pulse is either stretched (or compressed) in time so that it now has a duration many times longer (or many times shorter) than its input pulse duration, is spatially uniform (i.e. has no spatial chirp,) and collimated. It can be separated from the input pulse by passage through a Faraday isolator. If the invention is to be configured as a stretcher, the stretched pulse can then be seeded into an amplifier stage, wherein it is amplified by many orders of magnitude, without placing the materials within the system at risk of damage due to self-focusing. Subsequently it is temporally compressed by a similar design or other designs known to those skilled in the art. It may also be recompressed by an identical optical design wherein the grating is repositioned relative to the concave mirror so as to recompress the pulse.

REFERENCES:
patent: 5166818 (1992-11-01), Chase et al.
patent: 5329398 (1994-07-01), Lai et al.
patent: 5416629 (1995-05-01), Huber
patent: 5453871 (1995-09-01), Kolner et al.
Quintic-phase-limited, spatially uniform expansion and recompression of ultrashort optical pulses--Optical Society of America/Optics Letters vol. 18, No. 19.

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