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Nanosecond Frontend
The nanosecond frontend allows generating laser pulses with durations between 700 ps and
20 ns with programmable pulse shapes. The major part of the system is fiber-based, employing
a commercial cw single-mode laser source (Koheras Basik), an acousto-optical modulator
generating pulse slices of 100 ns, a double-pass fiber amplifier and an intensity modulator
which is driven by a programmable waveform 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.
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Schematic overview of the PHELIX Nanosecond Frontend. The left part is completely
fiber-based while in the ring renerative amplifier the laser light is propagating in air.
The fiber-based part is set up in a 19 inch rack.
The ring regenerative amplifier.
Typical system parameters are:
| ● Wavelength: |
1053 nm (longitudinal single-mode operation) |
| ● Ouput energy: |
20 mJ |
| ● Pulse duration: |
0.7-20 ns (programmable) |
| ● Repetition rate: |
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 |
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