We report on the recording of the near and far field intensity beam profiles to train a convolutional neural network, which is aimed to online detect system aberrations of an ultrafast laser amplifier. We extend the state of the art by implementing a spiral phase plate to use the concept of phase diversity. It is found that the underlying optical field in amplitude and phase can be accurately revealed.
A thin-disk multipass amplifier in an industrial package provides pulse energy and power scaling up to an average power in the kW regime with 10 mJ compressed pulses or 40 mJ CPA free pulses. The flexibility of the slab (TRUMPF TruMicro 6000 based) seed laser, such as choice of repetition rate, pulse duration, bursts or pulse on demand is maintained. Due to its mechanical and thermal stability, different applications like surface structuring or generation of EUV or X-ray radiation can be addressed.
We demonstrate ultrafast high-power laser operation, both at multi-kW average power in ultrashort-pulsed operation over extended bursts with hundreds of MHz intra-burst repetition rate from a modified TruMicro 6020 industrial laser, as well as uninterrupted, quasi-CW operation at an average power beyond 1 kW obtained with a TEM00 multipass thin-disk laser booster amplifier. The pulse repetition rate can be varied from 50 MHz to beyond 1 GHz, with single-pulse energies well above 10 μJ and single-pulse peak powers far beyond 10 MW without a post-compressor. These systems are attractive, e.g., for high-throughput materials processing or for driving nonlinear processes.
The thin-disk multipass amplifier provides pulse energy and power scaling up to more than 100 mJ of pulse energy and average power in the kW regime with a system amplification factor in the range of 100. The flexibility of the seed laser, such as choice of repetition rate, pulse duration, bursts or pulse on demand is maintained. Due to its mechanical and thermal stability, different applications like glass cutting or high harmonic generation for EUV or X-ray radiation can be addressed even in a harsh industrial environment.
The disk laser is one of the most important laser concepts for today’s industrial laser market. Offering high brilliance at low cost, high optical efficiency and great application flexibility the disk laser paved the way for many industrial laser applications. Over the past years power and brightness increased and the disk laser turned out to be a very versatile laser source, not only for welding but also for cutting. Both, the quality and speed of cutting are superior to CO2-based lasers for a vast majority of metals, and, most important, in a broad thickness range. In addition, due to the insensitivity against back reflections the disk laser is well suited for cutting highly reflective metal such as brass or copper. These advantages facilitate versatile cutting machines and explain the high and growing demand for disk lasers for applications besides welding applications that can be observed today. From a today’s perspective the disk principle has not reached any fundamental limits regarding output power per disk or beam quality, and offers numerous advantages over other high power resonator concepts, especially over fiber lasers or direct diode lasers. This paper will give insight in the latest progress in kilowatt class cw disk laser technology at TRUMPF and will discuss recent power scaling results as well.
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