Abstract
In the following we report on the first series of OPCPA measurements which we conducted on two LBO stages in vacuum (cf. Fig. 3.9). The presented data have been taken together with Christoph Skrobol and have partially already been described in his thesis [1]. For the measurement campaign, the Tube served as the last pump amplifier and the pump compressor was still located in air.
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Notes
- 1.
For this OPCPA campaign an early version of the XPW scheme was used that delivered only \(\sim \)1 \(\upmu \)J compared to \(\sim \)4 \(\upmu \)J in the final version that was described in Sect. 4.2.
- 2.
For some crystals and spectral bands also the suppression of parasitic SHG can play a role. For LBO and signal wavelengths from 700 to 1400 nm, however, none of the two orientations has an advantage over the other [3].
- 3.
The amplification results from the second stage are less instructive as phase matching was not optimized in this measurement in contrast to the more extensive XPW-campaign.
- 4.
In the current setup, this misalignment is difficult to correct as it emerges only when the compressor chamber is evacuated, i.e. when the components are inaccessible for manual alignment. In a currently ongoing rebuild this issue is solved by a motorization of the critical components. For details about the influence of compressor misalignment on pulse front tilt, see also Sect. 6.3.
- 5.
For the phase mismatch, the results from Fig. 2.14b were used. The gain was assumed to be \(10^{3}\) in the first and 50 in the second stage. The crystal thickness was 4 mm in both stages.
- 6.
... a cumbersome process involving venting and re-evacuation of the vacuum chambers for each modification as well as the partial rebuild of the compressor setup due to different design angles of the chirped mirrors.
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Kessel, A. (2018). OPCPA Experiments with Two OPA Stages. In: Generation and Parametric Amplification of Few‐Cycle Light Pulses at Relativistic Intensities. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-92843-2_5
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