A full start-to-end software (S2E) model of a laser system– including a mode-locked oscillator,
chirped pulse amplification shaper, and nonlinear upconversion– can help expand high power laser system designs routinely tackled with human-centered methodologies. S2E models can even enable reverse engineering of a laser system, allow for more streamlined exploration of parameter spaces for experimental setups, or train machine learning models for optimization and tuning of these systems. We present a generalized S2E model targeted at generating data of the photoinjector laser system at SLAC’s LCLS-II for training neural networks for optimization and, eventually, active tuning of the photoinjector.
Ultrafast thin-disk lasers are based on the mature thin-disk technology. This technique allows for highest pump powers due to very efficient cooling. Therefore, the thin-disk geometry offers exceptional scaling of laser performance in terms of average power. Over the last decade industrial lasers for cutting and welding applications were continuously improved. More than 12kW can be obtained by a single thin-disk in continuous wave mode. TRUMPF Scientific Lasers uses the same thin-disk components to develop and manufacture ultrafast amplifiers. The achieved output power is close to 2kW with record pulse energies >95 mJ.
Thomas Metzger, Christian Grebing, Clemens Herkommer, Sandro Klingebiel, Peter Krötz, Stephan Prinz, Sebastian Stark, Catherine Teisset, Christoph Wandt, Knut Michel
TRUMPF Scientific Lasers develops and provides customized ultrafast amplifiers based on thin-disk technology. Due to its efficient one-dimensional heat removal and the small longitudinal extension of the gain medium, the thin-disk geometry offers exceptional scaling performance both in terms of energy and average power. All systems are based on the industrialized TRUMPF thin-disk laser technology [1]. Regenerative amplifiers systems with multi-millijoule pulses, kilohertz repetition rates and picosecond pulse durations are currently available. Record pulse energies of 220 mJ at 1 kHz could be demonstrated originally developed for pumping optical parametric amplifiers [2-4]. In this contribution, we present different commercial ultrafast solutions based on regenerative amplifiers with up to 200 mJ of pulse energies and more than 1 kW of average power [3-5]. New developments with thin-disk based multipass amplifier cells led to multikilowatt average output powers [6-9]. First measures to scale the energy with multipass thin-disk amplifiers towards 1 J will be presented. In addition, concepts for nonlinear compression to reach pulse durations below 50 fs will be discussed.
Knut Michel, Christian Grebing, Clemens Herkommer, Sandro Klingebiel, Peter Krötz, Stephan Prinz, Marcel Schultze, Sebastian Stark, Catherine Teisset, Christoph Wandt, Thomas Metzger
TRUMPF Scientific Lasers provides ultrafast laser sources for the scientific community with high pulse energies and high average power. All systems are based on the industrialized TRUMPF thin-disk technology. Regenerative amplifiers systems with multi-millijoule pulses, kilohertz repetition rates and picosecond pulse durations are available. Record values of 220mJ at 1kHz could be demonstrated originally developed for pumping optical parametric amplifiers. A huge step will be to combine high energies, 1J per pulse, with average powers of several hundred watts to a kilowatt. Multipass amplifiers based on the thin-disk technology were successfully used to realize picosecond amplifiers with more than 2kW of average power. Nevertheless, the pulse energy was in the μJ or low mJ range. At TRUMPF Scientific Lasers these experiences will lead the way to set-up a system running at 1kHz repetition rate and a target pulse energy of 1J. Within the paper the roadmap to a Joule system will be presented as well as first results from a laboratory set-up.
We present results from our Ho:YLF regenerative amplifier (RA) producing up to 6.9 mJ at a repetition rate of 1 kHz and up to 12.9 mJ at a repetition rate of 10 Hz. At 1 kHz, we observe strongly bifurcating pulses, starting with certain round trip number, but the measurements identify a highly stable operation point that lies “hidden” beyond the instability region. This operation point allows the extraction of highly stable and high energetic output pulses. Suppression of bifurcation in our system is presented for repetition rates below 750 Hz and Ho:YLF crystal holder temperatures of 2.5 °C. We furthermore present a stability optimization routine for our Ho:YLF RA that was operated close to gain depletion at a repetition rate of 100 Hz. By varying the Ho:YLF crystal holder temperature the gain depletion level could be fine adjusted, resulting in a highly stable RA system with measured pulse fluctuations of only 0.35 %.
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