Detlef Nickel

High-repetition-rate regenerative thin-disk amplifier with 116 μJ pulse energy and 250 fs pulse duration

A thin-disk regenerative amplifier based on Yb-doped potassium yttrium tungstate is operated at 40 kHz with an output pulse energy of 116 microJ and a pulse duration of 250 fs. Dispersive stretching of the pulse during amplification instead of an external stretcher is used to avoid high peak intensities. The small amount of the laser active material in the amplifier inherent for the thin-disk laser design and a large beam radius in the Pockels cell reduce nonlinear effects further. Consequently the output pulses can be compressed to 250 fs using a pair of diffraction gratings.

Ultrafast thin-disk Yb:KY(WO 4 ) 2 regenerative amplifier with a 200-kHz repetition rate

We report an Yb:KYW thin-disk amplifier system that provides ultrashort pulses in the 10-microJ energy range at high repetition rates. The thin-disk concept uses large laser beam cross sections to avoid high peak intensities. Without using a traditional diffraction-grating stretcher, pulse energies of approximately 9 microJ with pulse durations of 280 fs at repetition rates of 200 kHz were generated.

200 kHz electro-optic switch for ultrafast laser systems

A method for obtaining very high electro-optic switching rates is demonstrated and employed for regenerative amplification of ultrashort pulses at high repetition rates. The intracavity polarization switch consists of a transverse-field BBO Pockels cell and a dielectric thin film polarizer. By multiple-shift usage of a single BBO crystal as Pockels cell, it is possible to keep thermal dissipation losses in the Pockels cell driver below 200 W. Using this intracavity polarization switch in an ultrafast thin-disk Yb:KYW regenerative amplifier, pulse energies of about 9 μJ with pulse durations of 280 fs at repetition rates of 200 kHz were generated.

CPA-free femtosecond thin disk Yb:KYW regenerative amplifier with high repetition rate

We report of an Yb:KYW thin disk amplifier system to provide ultra short pulses with high energies at high repetition rates. The thin disk concept uses large laser beam cross sections to avoid high peak intensities. Without using the chirped pulse amplification technique, pulse energies of about 100 μJ with pulse durations of 750 fs were generated at repetition rates of up to 45 kHz. Gires-Tournois interferometer mirrors are used in the amplifier resonator to avoid pulse stretching during amplification.

Femtosecond Thin Disk Yb:KYW Regenerative Amplifier with Astigmatism Compensation

Pulses with an energy of 116 µJ and 250 fs pulse duration at a repetition rate of 40 kHz are demonstrated. Special technique is applied to compensate the astigmatism of the laser crystal.

Ultrafast thin-disk Yb:KYW regenerative amplifier with a 200-kHz repetition rate

We report on an Yb:KYW thin-disk amplifier system to provide ultra-short pulses. Without using a diffraction grating stretcher, 5 μJ, 280 fs pulses were generated at repetition rates of 200 kHz.

Ultrafast Thin Disk Yb:KYW Regenerative Amplifier with 200 kHz Repetition Rate

We report of an Yb:KYW thin disk amplifier system to provide ultra short pulses. Without using a diffraction-grating stretcher, 5 µJ, 280 fs pulses were generated at repetition rates of 200 kHz.