Time-Domain Terahertz - Toptica

More documents

Recommendations

Info

Spectroscopy ExtensionBasic and complete VersionKey features· Available for 850 nm (GaAs) and1550 nm (InGaAs) technology· Basic version: 2 photomixers withlow-noise transimpedance amplifier· complete version with additionaloptomechanicsApplications· high-resolution spectroscopy· combustion analysis, semiconductorstudies, non-destructive testingThe Spectroscopy extension complements the laser packages and provides theessential equipment to start a frequency-domain terahertz experiment. employingthe latest GaAs or InGaAs photomixer technology, the Spectroscopy extension hastwo versions with different levels of integration. The basic version, conceived forresearchers who prefer to design their own terahertz beam path, features two fiberpigtailedphotomixers and a transimpedance amplifier. The second, or completeversion, additionally includes two positioning stages for the photomixers and twooff-axis parabolic mirrors to collimate and refocus the terahertz beam. The entiresystem is conveniently controlled from a standard laptop or Pc.AC Bias~DFB laser #1TXsample positionDFB laser #2RXLock-inDetectionStandard Package (green) withBasic (bright yellow) and CompleteSpectroscopy Extensions (yellow).Basic Spectroscopy ExtensionComplete Spectroscopy ExtensionSpecifications Spectroscopy Extension / Basic Spectroscopy Extension / CompletePhotomixersTransmitter and receiver module included(GaAs: 2x #eK-000685; InGaAs: #eK-000724 + #eK-000725)Lock-in amplifier Teracontrol, part of Standard Package 850 / TeraBeam 1550Transimpedance amplifierPdA-S, included2 xyz stages for photomixers -- Included2 off-axis parabolic mirrors -- IncludedManual delay stage -- IncludedMotorized delay stageno; please see Phase modulation extensionOptical rails -- IncludedComputer softwarecontrol program with GuI, includedorder informationTHz Spec Basic / 850 Spectroscopy extension, basic version, 850 nmTHz Spec Compl / 850Spectroscopy extension, complete version, 850 nmTHz Spec Basic / 1550 Spectroscopy extension, basic version, 1550 nmTHz Spec Compl / 1550Spectroscopy extension, complete version, 1550 nmnote: The Spectroscopy extension requires a set of seed lasers (e.g., the Standard Package SyST Thz STd / 850,or the TeraBeam 1550). It fits the Phase Modulation Extensions THz Phase Mod / 850 and THz Phase Mod / 1550.24 | www.toptica.com
Customized SolutionsInnovative Answers to “crazy” IdeasSolutions from the specialistsTerahertz science is a vibrant and exciting field of research. The number of applications isgrowing steadily, and so are the requirements on the utilized laser systems. Before long,a “Standard Package” may need to be modified if photomixers must be cooled to liquidheliumtemperatures or terahertz frequencies outside the lasers’ tuning range are desired.A “complete Spectroscopy extension” might even call for further completion if the beamis to be focused onto a microscopic sample.ToPTIcA’s product specialists have many years of hands-on experience with diodelasers, electronics and terahertz applications. They respond quickly and flexibly to yourrequirements.Tuning-range extensionsThe tuning range of the dFB lasers usually limits the frequency span of a cw terahertzspectrum. Adding a third diode laser greatly enhances the accessible frequency range.With carefully selected dFB laser wavelengths, ToPTIcA has pushed the bandwidth of a1550 nm TeraBeam + Spectroscopy extension to beyond 2 Thz.other “exotic” applications might require seed wavelengths other than 850 nm or 1550nm: for example, for research on novel photomixer materials, or for cryogenic experiments,where the temperature-induced change of the photomixers’ band-gap must be taken intoaccount. These systems may require a fully customized laser solution, but we at ToPTIcAlook forward to meeting the challenge!Megahertz resolution, focused beamsultimate spectral resolution is achieved by combining the dFB lasers of the StandardPackage with ToPTIcA’s patented iScan quadrature interferometer. The frequency ofeach laser is adjusted with an accuracy of 1 mhz. This translates directly into the resolutionof the terahertz signal, making the cw terahertz platforms well-suited for even the mostchallenging measurement tasks in low-pressure gas spectroscopy.If highest spatial (rather than spectral) resolution is required, ToPTIcA provides customizedoptics assemblies with a focused terahertz beam. dedicated mechanics include a slide barwith kinematic mounts, allowing the user to switch between transmission and reflectionmodemeasurements.Wavelength (nm)85785685585433 sec1.2 THz0 20 40 60 80 100 120 140Time (s)Precise linear frequency scanning.Key features· Flexible realization of customizeddesigns· Terahertz optics or 3-laser setupswith extended tuning range· Interferometric frequency controlwith single-mhz resolutionApplications· Precision spectroscopy(e.g., gas-sensing at low pressure)· Transmission/reflectionmeasurements with focusedterahertz beamSlide barCompact module for terahertzmeasurements in transmission (rightbeam path) and reflection mode (leftbeam path).Twin iScan for precise frequencycontrol.www.toptica.com | 25
Page 3 and 4: Terahertz WavesThe Final Frontier o
Page 5 and 6: Ceramic knife hidden behind blackde
Page 7 and 8: Frequency-Domain Terahertz Generati
Page 9 and 10: Pick one: cw or Pulsed Terahertz?Hi
Page 11 and 12: FemtoFiber pro NIRnear-Infrared Fem
Page 13 and 14: Photoconductive SwitchesFiber-coupl
Page 15 and 16: SpecificationsComponentsTeraFlashFe
Page 17 and 18: Standard PackageHigh PowerExtension
Page 19 and 20: Wide frequency tuning…The Standar
Page 21 and 22: Phase Modulation ExtensionTwin Fibe
Page 23: High power from InGaAs emittersInGa
Page 27 and 28: Take a Look InsideTerahertz radiati

Time-Domain Terahertz - Toptica

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?