femtosecond oscillators
Rainbows (Femtolasers): Chirped-mirror-dispersion-controlled, Kerr-lens-mode-locked Ti:sapphire oscillators producing few-cycle (~5 fs) NIR laser pulses with controlled carrier-envelope phase at repetition rates of 70-100 MHz and average power of 300-400mW.
Chirped-pulse oscillators (CPOs): Chirped-pulse Ti:sapphire and Yb:YAG oscillators for the generation of high-energy femtosecond laser pulses at reduced (few-MHz) repetition rate. Ti:sapphire CPOs: pulse duration ~50fs, pulse energy ~300 and 500 nJ @ 5 MHz repetition rate. Yb:YAG CPO: pulse duration ~800fs, pulse energy ~8 µJ @ 10 MHz repetition rate. Both master oscillators are being supplemented with a power amplifier for boosting the pulse energy by 1-2 orders of magnitude at the full repetition rate of the systems.
Enhancement cavities: Passive ring cavities for enhancing the energy of laser pulses emitted from femtosecond oscillators. Currently, the 200 fs pulses of a 78-MHz system are enhanced to up to 20 kW of average power inside the cavity and first coherent XUV generation experiments in this power regime are performed. Our next-generation enhancement cavities (in development) aim at pushing the average power of few-100-fs intracavity pulses towards the MW range on the one hand and at the enhancement of few-cycle pulses to the 10-kW level on the other hand.
contact: A. Apolonskiy
Chirped-pulse oscillators (CPOs): Chirped-pulse Ti:sapphire and Yb:YAG oscillators for the generation of high-energy femtosecond laser pulses at reduced (few-MHz) repetition rate. Ti:sapphire CPOs: pulse duration ~50fs, pulse energy ~300 and 500 nJ @ 5 MHz repetition rate. Yb:YAG CPO: pulse duration ~800fs, pulse energy ~8 µJ @ 10 MHz repetition rate. Both master oscillators are being supplemented with a power amplifier for boosting the pulse energy by 1-2 orders of magnitude at the full repetition rate of the systems.
Enhancement cavities: Passive ring cavities for enhancing the energy of laser pulses emitted from femtosecond oscillators. Currently, the 200 fs pulses of a 78-MHz system are enhanced to up to 20 kW of average power inside the cavity and first coherent XUV generation experiments in this power regime are performed. Our next-generation enhancement cavities (in development) aim at pushing the average power of few-100-fs intracavity pulses towards the MW range on the one hand and at the enhancement of few-cycle pulses to the 10-kW level on the other hand.
contact: A. Apolonskiy
References:
Power scaling of a high repetition rate enhancement cavity, I. Pupeza et al. Opt. Lett. 12, 2052 (2010)
Approaching the microjoule frontier with femtosecond laser oscillators, S. Naumov et al. New J. Phys. 7, 216 (2005)
High-dispersive mirrors for femtosecond lasers, V. Pervak et al., Opt. Express 16, 10220 (2008)
A frequency comb in the extreme ultraviolet, Ch. Gohle et al., Nature 436, 234 (2005)
High harmonic frequency comb for high resolution spectroscopy, A. Ozawa et al., Phys. Rev. Lett. 100, 253901 (2008)
Approaching the microjoule frontier with femtosecond laser oscillators, S. Naumov et al. New J. Phys. 7, 216 (2005)
High-dispersive mirrors for femtosecond lasers, V. Pervak et al., Opt. Express 16, 10220 (2008)
A frequency comb in the extreme ultraviolet, Ch. Gohle et al., Nature 436, 234 (2005)
High harmonic frequency comb for high resolution spectroscopy, A. Ozawa et al., Phys. Rev. Lett. 100, 253901 (2008)
Fig. 1. Seed-laser for the passive ring cavity resonator. (© ch)