The new laser system is a 100-kHz OPCPA from Fastlite, pumped by a 225-W Yb:YAG thin-disk regenerative amplifier from Trumpf Scientific, based on an industrial micro-machining system. The high repetition rate and average power of the OPCPA output is envisaged to provide good signal-to-noise ratio in both photo-electron and optical (infrared) spectroscopy experiments. The system has several outputs, as detailed in the following (according to factory acceptance tests):
Mode
| Wavelength (nm)
| Pulse energy (uJ)
| Pulse duration (fs)
|
CEP-stable HHG
| 1750 ± 100
2800 ± 200
| ~150 50-100
| 50 65
|
Tunable IR spectroscopy
| 1430-1850 2330-3680
| 85-240* 27-135*
| 80-160* 100-180*
|
* depending on wavelength
There is also the possibility to generate picosecond tunable IR pulses.
The laser has arrived on site and, despite Covid-related restrictions, we are currently making steady progress with the installation, remotely assisted by Trumpf Scientific and Fastlite. We are also commissioning a new 100-kHz HHG beamline and developing secondary sources in the vis-NIR and MIR to facilitate future experiments in time-resolved XUV photo-electron spectroscopy and 2D-IR spectroscopy. Further details regarding the laser specifications and secondary sources will soon be available.
