Nanosecond Frontend

technical contact: Udo Eisenbarth

The nanosecond frontend allows generating laser pulses with durations between 700 ps and 10 ns with programmable pulse shapes. The first system component was implemented completely with fiber technology. A commercial system (Photline) consists of a continuous wave laser source, a fiber amplifier, an acoustooptic modulator as well as an intensity modulator, which is controlled by an arbitrary signal generator (Tektronix AWG510). The fiber system delivers pulse energies up to 10 nJ. A flash lamp pumped regenerative Nd:glass ring amplifier then leads to energies up to 20 mJ with a repetition rate of 0.5 Hz.

https://www.gsi.de/fileadmin/Plasmaphysik/Nanosek-Frontend/nsFE_092017.png
https://www.gsi.de/fileadmin/Plasmaphysik/Nanosek-Frontend/nsFE-FiberFrontend.jpg
https://www.gsi.de/fileadmin/_migrated/pics/nsfe_3.jpg
The ring regenerative amplifier.

Key parameters are:

Wavelength:

1053 nm (longitudinal single-mode operation)

Ouput energy:

20 mJ

Pulse duration:

0,7-10 ns (programmable)

Repetition rate:

ca. 0,5 Hz

Constrast ratio:

>40 dB

Minimum pulse rise time:

750 pS

Warm up time:

10 minutes

Energy stability:

2% (PtP) over 30 minutes