Generation of high power pulses with high repetition rate with subnanosecond pulse front for pumping different lasers

5^th International Conference and Exhibition on Lasers, Optics & Photonics

November 28-30, 2016 Atlanta, USA

Peter A Bokhan, P P Gugin, M A Lavrukhin and D M E Zakrevsky

A V Rzhanov Institute of Semiconductor Physics, Russia

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

The output characteristics of laser essentially depend on power supply pulse duration and its energy. This case is a very important switching characteristic of a device used for short and powerful pulse generation. The subnanosecond breakdown stage in the kivotron, novel switching device with counter-propagating electron beams based on the open discharge in helium, was experimentally studied. It was shown that the fast discharge stage arises when the discharge self-sustaining regime is ensured by the photoelectron emission from the cathodes due to resonant radiation emitted by fast helium atoms that have large Doppler shifts with respect to the line center. Since the excitation cross-section of a helium atom by another fast helium atom increases rapidly with the energy of the fast atom, the duration of the breakdown stage strongly depends on the working voltage in the range 2-10kV and weakly from 15 to 100 kV. The switching time less than 80ps was achieved when discharge circuit loaded to a resistance RLâ�¥50 �©. Decrease of RL down to 10 �© increases the switching time to about 100ps at 1.5-kA current with current density 120A/cm2. A minimum switching time that can be achieved via kivotron design optimization is estimated to be about 35ps. A kivotron has to be used for pumping of different laser, including copper vapor laser, semiconductor lasers, etc. It was demonstrated that in this case it is possible to improve essential laser output characteristics.

Biography :

Email: bokhan@isp.nsc.rutt