Investigation and Application of Ultrafast Photoresponse of YBa2Cu3O7-δ Microbridges, Excited by High Fluence Optical Pulses |
| A. Jukna
Department of Electrical and Computer Engineering and Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14627, USA and High Power Pulse Laboratory, Semiconductor Physics Institute, A. Goštauto 11, 01108 Vilnius, Lithuania |
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| Received: 22 08 2004; |
| Ultrafast photoresponse of dc-biased optically-thick YBa2Cu3O7-δ microbridges at T<Tc triggered with 100 fs optical pulses of high fluence was investigated by means of sampling oscilloscope and approach of a S-(1.5-4 GHz) & C-(4-7 GHz) frequency-band antenna radiation, excited by the photoresponse. A superposition of ultrafast- (photokinetic) and slow- (bolometric) components of the photoresponse caused a quadratic rise of Fourier amplitude of the radiation with a laser fluence increase. The maximum of the radiation amplitude was obtained at T=Tc-9.2 K and a repetition rate of the transmitting-antenna decreased from 180 to 20 MHz, when laser fluence was increased from 5 to 40 mJ cm-2/pulse. A method for optically-thick photoswitches triggering with high fluence optical pulses is demonstrated and discussed. |
| DOI: 10.12693/APhysPolA.107.230 PACS numbers:85.25.-j, 74.72.Bk, 74.78.Bz |