Research Equipment

Research Equipment

THz pumps – THz pump #1 and THz pump #2

The ELI ALPS THz pump#1 laser system provides 500 fs, 500 mJ laser pulses at 50 Hz repetition rate at 1030 nm central wavelength. The system consists of a synchronizable fibre oscillator, a fibre stretcher, a regenerative amplifier, several thin disk multipass amplifiers and a grating compressor.

The THz pump#2 laser system provides 92 fs, 4 mJ laser pulses at 1 kHz repetition rate at 781 nm. The system consists of a synchronizable fibre oscillator, an Öffner-stretcher, a regenerative amplifier, a multipass amplifier and a grating compressor. The oscillators of the lasers can be synchronized electronically resulting in a timing jitter of the output pulses close to 10 ps. The pulse energy of THz pump #1 can be continuously controlled and lowered to 15 mJ without changing any other beam parameter. The pulse duration of THz pump #2 can be tuned up to about 6 ps by adjusting the distance of the gratings in the compressor.
Table 1 shows the specifications of THz pump #1 and #2 laser systems.

Table 1. Measured output parameters of THz pump #1 and #2 laser systems.


Measured parameters of THz pump lasers.

 

 Fig.1.a) Results of pulse duration measurements with the Wizzler. The measured duration is 497.6 fs and the FTL is 493.4 fs.

 

Fig.1.b) Results of pulse duration measurements with the Wizzler. The measured duration is 92.8 fs and the FTL is 92.7 fs.

a)

b)

 Fig.2. Output spectra of THz pump #1, FWHM is 3.51 nm (a) and THz pump #2, FWHM is 13.3 nm (b).

 

a)

b)

Fig.3. Output energy stability curve of THz pump #1 (a) and THz pump #2 (b).

 

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