Use of aperiodic quasi-phase-matched gratings in ultrashort puls

Details Use of aperiodic quasi-phase-matched gratings in ultrashort puls Use of aperiodic quasi-phase-matched gratings in ultrashort puls

1997-04-25

1999-02-02

Hellner, Mark

Optical: systems and elements

Optical amplifier

359 25, 359102, H01S 300

Patent

active

058673040

ABSTRACT:
A chirped pulse amplification system employs chirped quasi-phase-matched (QPM) gratings as dispersive delay lines for stretching and/or compressing ultrashort pulses. QPM gratings with periods varying along the beam propagation direction produce simultaneous second-harmonic generation and, in general, both amplitude and phase modulation of this second harmonic output. The aperiodic QPM gratings are designed to provide stretching or compression of the output second harmonic pulse with respect to the fundamental-wavelength input pulse. The chirped QPM gratings are also used for simultaneous harmonic generation and compressing of the chirped output from a femtosecond laser oscillator. In general, the aperiodic QPM gratings can be used to efficiently produce arbitrarily shaped second-harmonic pulses.

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