Aperiodic quasi-phasematching gratings for chirp adjustments and

Details Aperiodic quasi-phasematching gratings for chirp adjustments and Aperiodic quasi-phasematching gratings for chirp adjustments and

1997-03-26

1998-09-29

Lee, John D.

Optical: systems and elements

Optical frequency converter

Harmonic generator

359326, 359573, 359575, 385 37, 385122, G02F 137, G02B 518

Patent

active

058153071

ABSTRACT:
An apparatus and method for simultaneous chirp adjustment and frequency conversion of an ultra-short input optical pulse A.sub.1 characterized by a center angular frequency .omega..sub.1,0 in a non-linear optical material with a quasi-phasematching (QPM) grating exhibiting an aperiodic pattern of regions D.sub.j constituting a grating. Passing the ultra-short input optical pulse A.sub.1 through the grating gives rise to a chirp-adjusted and frequency-converted output optical pulse A.sub.2. In the preferred embodiment the non-linear optical material is a Second Harmonic Generator (SHG) such that the output optical pulse A.sub.2 generated from the input optical pulse A.sub.1 is a chirp-adjusted second harmonic of said ultra-short input optical pulse A.sub.1. In the general case the method and apparatus use a transfer function D(.OMEGA.) derived from the equation:

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