US 12,272,919 B2
Generation of ultrashort laser pulses
Robert Herda, Munich (DE); and Axel Friedenauer, Hohenschaftlarn (DE)
Assigned to Toptica Photonics AG, Gräfelfing (DE)
Filed by Toptica Photonics AG, Gräfelfing (DE)
Filed on Sep. 30, 2019, as Appl. No. 16/588,284.
Prior Publication US 2021/0098960 A1, Apr. 1, 2021
Int. Cl. H01S 3/00 (2006.01); G02F 1/37 (2006.01); H01S 3/109 (2006.01)
CPC H01S 3/109 (2013.01) [G02F 1/37 (2013.01); H01S 3/0057 (2013.01); H01S 3/0092 (2013.01)] 15 Claims
OG exemplary drawing
 
1. Laser system for generating pulsed laser radiation, comprising:
a laser source generating pulsed laser radiation at a fundamental wavelength;
a first periodically poled nonlinear crystal section arranged in the beam path and having a poling period larger than or smaller than the poling period satisfying the quasi-phase-matching condition at the fundamental wavelength to spectrally broaden the laser radiation; and
a second periodically poled nonlinear crystal section arranged in the beam path downstream of the first section, wherein the second section is quasi-phase-matched at the fundamental wavelength to frequency-convert the laser radiation, further comprising an adjustable dispersive element arranged in the beam path upstream of the first periodically poled nonlinear crystal section to generate a negative pre-chirp of the laser radiation.