Compact cw Terahertz Spectrometer Pumped at 1.5 Delta mm Wavelength

A compact and low-cost continuous wave terahertz spectrometer operating at an optical wavelength of 1.5 Delta *mm is presented. The spectrometer employs high power distributed feedback (DFB) laser diodes in integrated 'butterfly' packages. No further optical amplification of the beating si...

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Published inJournal of infrared, millimeter and terahertz waves Vol. 32; no. 2; pp. 225 - 232
Main Authors Stanze, Dennis, Deninger, Anselm, Roggenbuck, Axel, Schindler, Stephanie, Schlak, Michael, Sartorius, Bernd
Format Journal Article
LanguageEnglish
Published 01.02.2011
Subjects
Butterflies
Detectors
Feedback
Laser diodes
Noise levels
Spectrometers
Tuning
Wavelengths
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Summary:A compact and low-cost continuous wave terahertz spectrometer operating at an optical wavelength of 1.5 Delta *mm is presented. The spectrometer employs high power distributed feedback (DFB) laser diodes in integrated 'butterfly' packages. No further optical amplification of the beating signal is required. An integrated photodiode antenna with an output power of 5 Delta *mW at 500 GHz is used as efficient terahertz emitter. Employing low-temperature grown (LT-) InGaAs/InAlAs photoconductive receivers as coherent detectors, SNR values of the terahertz power up to 75 dB are attained at an integration time of 300 ms. Accurate characterization of the thermal tuning behavior of the DFBs and precise thermal control yield an absolute accuracy of 1 GHz and a resolution of better than 5 MHz, without any on-line monitoring of the optical frequency. Due to the high frequency resolution no delay line is needed to vary the terahertz phase.
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ISSN:1866-6892
DOI:10.1007/s10762-010-9751-8