UV femtosecond amplifiers

UV femtosecond amplifiers are special KrF excimer gain modules, designed for the amplification of frequency converted pulses of typically <1 ps duration at 248.5 nm. Such seed pulses can be obtained by frequency doubling or tripling of visible or infrared pulses, respectively. The required seed pulse energy for optimum amplification ranges from 30 to 150 µJ.

LLG 50

The LLG 50 excimer amplifier was designed to amplify frequency converted pulses of ultrashort pulse lasers. In this way high brightness UV pulses can be generated. Depending on the available seed pulse energy at 248 nm, a two or three pass amplification geometry is realized. The LLG 50 is delivered together with a synchronization unit insuring long term temporal synchronism between the amplifier and the seed laser source.

Specifications

Wavelength            248 nm
Energy per pulse    50 mJ (bei > 50 µJ seed pulse energy @ 248 nm)
Jitter                       ± 3 ns (relative to trigger pulse)
Beam size               ~ 36 x 36 mm
Beam quality           2 x diffraction limited (for M2 = 1 at the input)

LLG 100

The LLG 100 amplifier is an extended version of the LLG 50. The output energy is doubled by using the interferometric multiplexing technique. According to this scheme, the linearly polarized input beam is divided into two orthogonally polarized components, which propagate through the amplifier in opposite directions along the same optical path. This insures phase locked recombination of the partial beams at the output.

Specifications

Wavelength            248 nm
Energy per pulse    100 mJ (bei > 50 µJ seed pulse energy @ 248 nm)
Jitter                       ± 3 ns (relative to trigger pulse)
Beam size               ~ 36 x 36 mm
Beam quality           3 x diffraction limited (for M2 = 1 at the input)

TwinAmp

The „TwinAmp“ is a special excimer amplifier having two discharge channels. This system architecture allows reaching a very high overall gain. Moreover, it also makes it possible to implement a spatial filter and a pulse compressor between the amplifier modules. The benefit is a shorter pulse duration and a better signal to noise ratio at the output. This model is particularly favorable for applications demanding extremely high focused intensities.

Specifications

Wavelength             248 nm
Energy per pulse     40 mJ (for > 50 µJ seed pulse energy @ 248 nm)
Jitter                        ± 32 ns (relative to trigger pulse)
Beam size                ~ 36 x 36 mm
Beam quality            1.5 x diffraction limited (for M2 = 1 at the input)
Pulse duration         < 300 fs (for <180 fs seed pulse)
ASE background      < 1010 in the far field
Beam size                25 x 25 mm
Beam quality            2 x diffraction limited (for M2=1 at the input)

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Laser-Laboratorium Göttingen e.V. (LLG)

Contact person

Head of the Department
Dr. Peter Simon
"Short Pulses / Nanostructures"

Tel.: +49(0)551/5035-21
FAX: +49(0)551/5035-99
peter.simon(at)llg-ev.de

Contact person for
Nano Structure Technology:

Dr. Jürgen Ihlemann
Tel.: +49(0)551/5035-44
FAX: +49(0)551/5035-99
juergen.ihlemann(at)llg-ev.de