Detection of nanosecond-scale, high power THz pulses with a field effect transistor

  • We demonstrate detection and resolution of high power, 34 ns free electron laser pulses using a rectifying field effect transistor. The detector remains linear up to an input power of 11 ± 0.5 W at a pulse energy of 20 ± 1 μJ at 240 GHz. We compare its performance to a protected Schottky diode, finding a shorter intrinsic time constant. The damage threshold is estimated to be a few 100 W. The detector is, therefore, well-suited for characterizing high power THz pulses. We further demonstrate that the same detector can be used to detect low power continuous-wave THz signals with a post detection limited noise floor of 3.1 μW/math. Such ultrafast, high power detectors are important tools for hWe demonstrate detection and resolution of high power, 34 ns free electron laser pulses using a rectifying field effect transistor. The detector remains linear up to an input power of 11 ± 0.5 W at a pulse energy of 20 ± 1 μJ at 240 GHz. We compare its performance to a protected Schottky diode, finding a shorter intrinsic time constant. The damage threshold is estimated to be a few 100 W. The detector is, therefore, well-suited for characterizing high power THz pulses. We further demonstrate that the same detector can be used to detect low power continuous-wave THz signals with a post detection limited noise floor of 3.1 μW/math. Such ultrafast, high power detectors are important tools for high power and high energy THz facilities such as free electron lasers.show moreshow less

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Metadaten
Author:Sascha Preu, H. Lu, M. S. Sherwin, A. C. Gossard
URN:urn:nbn:de:bvb:29-opus-38281
Title of the journal / compilation:Review of Scientific Instruments 83.5 (2012): 07.11.2012 <http://rsi.aip.org/resource/1/rsinak/v83/i5/p053101_s1>
Document Type:Article
Language:English
Date of Publication (online):2012/11/08
Publishing Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Release Date:2012/11/08
Tag:Schottky diodes; field effect transistors; free electron lasers; optical pulse generation; terahertz wave spectra
SWD-Keyword:-
Original publication:Review of Scientific Instruments 83.5 (2012): 07.11.2012 <http://rsi.aip.org/resource/1/rsinak/v83/i5/p053101_s1>
Institutes:Naturwissenschaftliche Fakultät -ohne weitere Spezifikation-
Dewey Decimal Classification:500 Naturwissenschaften und Mathematik
PACS-Classification:41.60.Cr Free-electron lasers (see also 52.59.Rz Free-electron devices-in plasma physics)
42.60.-v Laser optical systems: design and operation
Collections:Allianzlizenzen 2012

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