Contact

Dr. Mathias Siebold
Scientist; PW-Laser PEnELOPE
Laser Particle Acceleration
m.sieboldAthzdr.de
Phone: +49 351 260 - 3049
Fax: +49 351 260 - 13049

Dr. Daniel Albach
Laser Particle Acceleration
d.albachAthzdr.de
Phone: +49 351 260 - 2831
Fax: +49 351 260 - 12831

Markus Löser
PhD student, project PW-Laser PEnELOPE
Laser Particle Acceleration
m.loeserAthzdr.de
Phone: +49 351 260 - 3006
Fax: +49 351 260 - 13006

Penelope_impressions

PENELOPE

sun focus If we focussed all the solar radiation coming on earth on a tiny spot as small as the tip of a pencil we would obtain intensities as high as 1022 Watts per cm2. However, with any optical lens one can only achieve the surface intensity (or temperature) of the thermal radiator itself which corresponds to 104 W/cm2 or 6000 K when focussing the sun. A laser can be focussed down almost to spot sizes as small as the wavelength of light (several micrometers). With a pulse duration of 100 fs and pulse energy of 100 J (similar to a potential energy when climbig one step of a staircase) a power of 1 Petawatt (1015 W) can be achieved. This would correspond to a power when we would burn the entire primary energy of our country (around 10 PJ) per year within 10 seconds. Our lasers do that only once a second and therefore the power consumption PENELOPE's pumping diode system is at the Kilowatt scale.
PEnELOPE system The PENELOPE system is a direct diode pumped laser with an overall pump power of 1.3 MW. An oscillator generates pulses of 60 fs, which are stretched by 200 ps/nm with a hard clip of 50 nm resulting in 4 ns (FWHM) pulses. Subsequent amplification in several stages (High-Gain Broadband Amplifier, HGBA I to III) increases the energy to the joule level. The two High-Energy Power Amplification stages (HEPA I and II) are designed to increase the energy to 200 J before final compression takes place. While the first amplification stages rely on an active-mirror approach, the last two amplifiers work in transmission with several He-gas cooled gain medium slabs. Both final two main amplifiers rely on 12 fully imaged, reflective extraction passes using spherical mirrors. Yb3+:CaF2 is used as gain medium throughout the laser in order to maintain the necessary pulse bandwidth for 150 fs pulses. Recent activation of HEPA I showed 12.6 J together with a spectral bandwidth supporting 150 fs pulses. Current work is dedicated to activate the cooling solution for HEPA I supporting a 1 Hz operation. Furthermore, the construction of HEPA II was initiated with the installation of its vacuum vessel.
Photographic view of the 10 J laser amplifier.
Photo of the 10 J laser amplifier HEPA I.

Contact

Dr. Mathias Siebold
Scientist; PW-Laser PEnELOPE
Laser Particle Acceleration
m.sieboldAthzdr.de
Phone: +49 351 260 - 3049
Fax: +49 351 260 - 13049

Dr. Daniel Albach
Laser Particle Acceleration
d.albachAthzdr.de
Phone: +49 351 260 - 2831
Fax: +49 351 260 - 12831

Markus Löser
PhD student, project PW-Laser PEnELOPE
Laser Particle Acceleration
m.loeserAthzdr.de
Phone: +49 351 260 - 3006
Fax: +49 351 260 - 13006