Modulation bandwidth and noise limit of photoconductive gates
dc.contributor.author | Whitaker, John F. | en_US |
dc.contributor.author | Hwang, J. R. | en_US |
dc.contributor.author | Cheng, H. J. | en_US |
dc.contributor.author | Rudd, James V. | en_US |
dc.date.accessioned | 2006-09-08T21:19:54Z | |
dc.date.available | 2006-09-08T21:19:54Z | |
dc.date.issued | 1996-07 | en_US |
dc.identifier.citation | Hwang, J. R.; Cheng, H. J.; Whitaker, J. F.; Rudd, J. V.; (1996). "Modulation bandwidth and noise limit of photoconductive gates." Optical and Quantum Electronics 28(7): 961-973. <http://hdl.handle.net/2027.42/43338> | en_US |
dc.identifier.issn | 0306-8919 | en_US |
dc.identifier.issn | 1572-817X | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/43338 | |
dc.description.abstract | The modulation bandwidth and noise limit of a photoconductive sampling gate are studied by reducing the parasitic capacitance and leakage current of the sampling circuit using an integrated junction field-effect transistor (JFET) source follower. The modulation bandwidth of the photoconductive sampling gate is limited by the external parasitic capacitance, and its efficiency is found to saturate at a laser gating power of about 1 mW. It is determined that the noise of the photoconductive sampling gate is dominated by the photovoltaic current due to the gating laser amplitude fluctuation. A minimum noise level of 4 nV Hz −1/2 has been measured, and an enhancement in signal-to-noise ratio by a factor of >45 has been achieved after the integration of the source follower with the photoconductive sampling gate. The JFET source follower serves to increase the modulation bandwidth of the photoconductive sampling gate by about 15 times and buffer the charge of the measured signal using its extremely high gate input impedance. The performance of the photoconductive sampling gate in regard to invasiveness and gating efficiency has been optimized, while a picosecond temporal resolution has been maintained and the signal-to-noise performance has been enhanced using a gating laser power as low as 10 μW. | en_US |
dc.format.extent | 821214 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Kluwer Academic Publishers; Chapman & Hall ; Springer Science+Business Media | en_US |
dc.subject.other | Characterization and Evaluation Materials | en_US |
dc.subject.other | Computer Communication Networks | en_US |
dc.subject.other | Applied Optics, Optoelectronics, Optical Devices | en_US |
dc.subject.other | Electronic and Computer Engineering | en_US |
dc.subject.other | Physics | en_US |
dc.title | Modulation bandwidth and noise limit of photoconductive gates | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Mechanical Engineering | en_US |
dc.subject.hlbsecondlevel | Electrictrical Engineering | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Center for Ultrafast Optical Science, University of Michigan, 48109-2099, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationum | Center for Ultrafast Optical Science, University of Michigan, 48109-2099, Ann Arbor, MI, USA; Picometrix Inc., P.O. Box 130243, 48113, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationum | Center for Ultrafast Optical Science, University of Michigan, 48109-2099, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationother | Picometrix Inc., P.O. Box 130243, 48113, MI, Ann Arbor, USA | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/43338/1/11082_2004_Article_BF00820161.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1007/BF00820161 | en_US |
dc.identifier.source | Optical and Quantum Electronics | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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