A terahertz system using semi-large emitters: noise and performance characteristics
We have built a relatively simple, highly efficient, terahertz (THz) emission and detection system centred around a 15 fs Ti:sapphire laser. In the system, 200 mW of laser power is focused on a 120 microm diameter spot between two silverpaint electrodes on the surface of a semi-insulating GaAs cryst...
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| Veröffentlicht in: | Physics in medicine & biology 2002-11, Vol.47 (21), p.3699-3704 |
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| container_issue | 21 |
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| container_title | Physics in medicine & biology |
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| creator | Zhao, G Schouten, R N Valk, N van der Wenckebach, W Th Planken, P C M |
| description | We have built a relatively simple, highly efficient, terahertz (THz) emission and detection system centred around a 15 fs Ti:sapphire laser. In the system, 200 mW of laser power is focused on a 120 microm diameter spot between two silverpaint electrodes on the surface of a semi-insulating GaAs crystal, kept at a temperature near 300 K, biased with a 50 kHz, +/- 400 V square wave. Using rapid delay scanning and lock-in detection at 50 kHz, we obtain probe laser quantum-noise limited signals using a standard electro-optic detection scheme with a 1 mm thick (110) oriented ZnTe crystal. The maximum THz-induced differential signal that we observe is deltaP/P = 7 x 10(-3), corresponding to a THz peak amplitude of 95 V cm(-1). The THz average power was measured to be about 40 microW, to our knowledge the highest power reported so far generated with Ti:sapphire oscillators as a pump source. The system uses off-the-shelf electronics and requires no microfabrication techniques. |
| doi_str_mv | 10.1088/0031-9155/47/21/304 |
| format | Article |
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In the system, 200 mW of laser power is focused on a 120 microm diameter spot between two silverpaint electrodes on the surface of a semi-insulating GaAs crystal, kept at a temperature near 300 K, biased with a 50 kHz, +/- 400 V square wave. Using rapid delay scanning and lock-in detection at 50 kHz, we obtain probe laser quantum-noise limited signals using a standard electro-optic detection scheme with a 1 mm thick (110) oriented ZnTe crystal. The maximum THz-induced differential signal that we observe is deltaP/P = 7 x 10(-3), corresponding to a THz peak amplitude of 95 V cm(-1). The THz average power was measured to be about 40 microW, to our knowledge the highest power reported so far generated with Ti:sapphire oscillators as a pump source. 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In the system, 200 mW of laser power is focused on a 120 microm diameter spot between two silverpaint electrodes on the surface of a semi-insulating GaAs crystal, kept at a temperature near 300 K, biased with a 50 kHz, +/- 400 V square wave. Using rapid delay scanning and lock-in detection at 50 kHz, we obtain probe laser quantum-noise limited signals using a standard electro-optic detection scheme with a 1 mm thick (110) oriented ZnTe crystal. The maximum THz-induced differential signal that we observe is deltaP/P = 7 x 10(-3), corresponding to a THz peak amplitude of 95 V cm(-1). The THz average power was measured to be about 40 microW, to our knowledge the highest power reported so far generated with Ti:sapphire oscillators as a pump source. The system uses off-the-shelf electronics and requires no microfabrication techniques.</description><subject>Arsenicals - chemistry</subject><subject>Biological and medical sciences</subject><subject>Crystallization - methods</subject><subject>Crystallography - methods</subject><subject>Electromagnetic Phenomena - instrumentation</subject><subject>Equipment Design</subject><subject>Equipment Failure Analysis</subject><subject>Gallium - chemistry</subject><subject>Lasers</subject><subject>Materials Testing</subject><subject>Medical sciences</subject><subject>Microwaves</subject><subject>Optics and Photonics - instrumentation</subject><subject>Photic Stimulation - instrumentation</subject><subject>Photic Stimulation - methods</subject><subject>Quality Control</subject><subject>Semiconductors</subject><subject>Sensitivity and Specificity</subject><subject>Spectrum Analysis - instrumentation</subject><subject>Spectrum Analysis - methods</subject><subject>Stochastic Processes</subject><subject>Tellurium - chemistry</subject><subject>Transducers</subject><subject>Zinc Compounds - chemistry</subject><issn>0031-9155</issn><issn>1361-6560</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp90E1rFTEUBuAgFnut_gJBstGFML05-ZhJ3JXiR6HQRXUdMpkzbWS-zJm7qL--udxLu1BcJZDnPUlext6BOAdh7VYIBZUDY7a62UrYKqFfsA2oGqra1OIl2zyJU_aa6JcQAFbqV-wUpDbSmHrDbi_4ijncY17_cHqgFUe-ozTdccIxVUPId8jLbi2KPvNpToQ8TB1fMPdzHsMUkcf7kEMsItGaIr1hJ30YCN8e1zP28-uXH5ffq-ubb1eXF9dV1A7Wyhqp29oq10IoH2pMr23o24hgLILGTkHtnAXtJHat7fq2U4iqdlFa1bVBnbGPh7lLnn_vkFY_Joo4DGHCeUe-kSVvtCtQHWDMM1HG3i85jSE_eBB-36XfN-X3TXndeAm-dFlS74_jd-2I3XPmWF4BH44gUAxDn0sZiZ6dck7Kpinu08GleXk6_ceNfun6gs__xv975iMgjpeW</recordid><startdate>20021107</startdate><enddate>20021107</enddate><creator>Zhao, G</creator><creator>Schouten, R N</creator><creator>Valk, N van der</creator><creator>Wenckebach, W Th</creator><creator>Planken, P C M</creator><general>IOP Publishing</general><general>Institute of Physics</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20021107</creationdate><title>A terahertz system using semi-large emitters: noise and performance characteristics</title><author>Zhao, G ; Schouten, R N ; Valk, N van der ; Wenckebach, W Th ; Planken, P C M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c491t-8524b6839b1a10875f48afbce158e14ed3169981492edb8dfbd3ee369c283dba3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Arsenicals - chemistry</topic><topic>Biological and medical sciences</topic><topic>Crystallization - methods</topic><topic>Crystallography - methods</topic><topic>Electromagnetic Phenomena - instrumentation</topic><topic>Equipment Design</topic><topic>Equipment Failure Analysis</topic><topic>Gallium - chemistry</topic><topic>Lasers</topic><topic>Materials Testing</topic><topic>Medical sciences</topic><topic>Microwaves</topic><topic>Optics and Photonics - instrumentation</topic><topic>Photic Stimulation - instrumentation</topic><topic>Photic Stimulation - methods</topic><topic>Quality Control</topic><topic>Semiconductors</topic><topic>Sensitivity and Specificity</topic><topic>Spectrum Analysis - instrumentation</topic><topic>Spectrum Analysis - methods</topic><topic>Stochastic Processes</topic><topic>Tellurium - chemistry</topic><topic>Transducers</topic><topic>Zinc Compounds - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhao, G</creatorcontrib><creatorcontrib>Schouten, R N</creatorcontrib><creatorcontrib>Valk, N van der</creatorcontrib><creatorcontrib>Wenckebach, W Th</creatorcontrib><creatorcontrib>Planken, P C M</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Physics in medicine & biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhao, G</au><au>Schouten, R N</au><au>Valk, N van der</au><au>Wenckebach, W Th</au><au>Planken, P C M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A terahertz system using semi-large emitters: noise and performance characteristics</atitle><jtitle>Physics in medicine & biology</jtitle><addtitle>Phys Med Biol</addtitle><date>2002-11-07</date><risdate>2002</risdate><volume>47</volume><issue>21</issue><spage>3699</spage><epage>3704</epage><pages>3699-3704</pages><issn>0031-9155</issn><eissn>1361-6560</eissn><coden>PHMBA7</coden><abstract>We have built a relatively simple, highly efficient, terahertz (THz) emission and detection system centred around a 15 fs Ti:sapphire laser. In the system, 200 mW of laser power is focused on a 120 microm diameter spot between two silverpaint electrodes on the surface of a semi-insulating GaAs crystal, kept at a temperature near 300 K, biased with a 50 kHz, +/- 400 V square wave. Using rapid delay scanning and lock-in detection at 50 kHz, we obtain probe laser quantum-noise limited signals using a standard electro-optic detection scheme with a 1 mm thick (110) oriented ZnTe crystal. The maximum THz-induced differential signal that we observe is deltaP/P = 7 x 10(-3), corresponding to a THz peak amplitude of 95 V cm(-1). The THz average power was measured to be about 40 microW, to our knowledge the highest power reported so far generated with Ti:sapphire oscillators as a pump source. The system uses off-the-shelf electronics and requires no microfabrication techniques.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><pmid>12452556</pmid><doi>10.1088/0031-9155/47/21/304</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Arsenicals - chemistry Biological and medical sciences Crystallization - methods Crystallography - methods Electromagnetic Phenomena - instrumentation Equipment Design Equipment Failure Analysis Gallium - chemistry Lasers Materials Testing Medical sciences Microwaves Optics and Photonics - instrumentation Photic Stimulation - instrumentation Photic Stimulation - methods Quality Control Semiconductors Sensitivity and Specificity Spectrum Analysis - instrumentation Spectrum Analysis - methods Stochastic Processes Tellurium - chemistry Transducers Zinc Compounds - chemistry |
| title | A terahertz system using semi-large emitters: noise and performance characteristics |
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