Multi-channel homodyne detection of continuous-wave terahertz radiation

Gregory, I. S.; Tribe, W. R.; Evans, Michael J.; Drysdale, Timothy D.; Cumming, David R. S.; Missous, M.

doi:10.1063/1.1990249

Cited by 16 publications

(12 citation statements)

References 13 publications

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“…Hence, a system optimized for CW generation and detection over a wide frequency range will also work in pulsed mode, by replacing the dual-color laser source by a femtosecond laser source. As an intermediate state between the CW mode of operation and the broadband, pulsed mode of operation, the simultaneous generation and coherent detection of multiple THz frequencies was demonstrated using multimode laser diodes [59][60][61][62]101].…”

Section: Continuous-wave Thz Generation and Detectionmentioning

confidence: 99%

Terahertz spectroscopy and imaging – Modern techniques and applications

Jepsen

Cooke

Koch

2010

Laser & Photonics Reviews

1,746

977

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Over the past three decades a new spectroscopic technique with unique possibilities has emerged. Based on coherent and time-resolved detection of the electric field of ultrashort radiation bursts in the far-infrared, this technique has become known as terahertz time-domain spectroscopy (THz-TDS). In this review article the authors describe the technique in its various implementations for static and time-resolved spectroscopy, and illustrate the performance of the technique with recent examples from solid-state physics and physical chemistry as well as aqueous chemistry. Examples from other fields of research, where THz spectroscopic techniques have proven to be useful research tools, and the potential for industrial applications of THz spectroscopic and imaging techniques are discussed.

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Section: Continuous-wave Thz Generation and Detectionmentioning

confidence: 99%

Terahertz spectroscopy and imaging – Modern techniques and applications

Jepsen

Cooke

Koch

2010

Laser & Photonics Reviews

1,746

977

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show abstract

“…They showed that the use of a multimode diode laser in a continuous wave THz system enables the simultaneous generation and investigation of multiple THz frequencies. Gregory et al implemented the same idea with external cavity diode lasers in a homodyne detection setup for multichannel THz detection [86]. These multiple channels are the mixing frequencies of the different individual modes of the diodes.…”

Section: Broadband Thz Systemsmentioning

confidence: 99%

Semiconductor Diode Lasers for Terahertz Technology

Brenner

Friedrich

Hofmann

2011

J Infrared Milli Terahz Waves

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We discuss different concepts for generating terahertz (THz) radiation with semiconductor diode lasers. Photomixing enables the generation of continuous wave THz radiation by difference frequency generation of two lasers or of two-colour lasers. Pulsed THz radiation for time domain THz spectroscopy is generated with modelocked diode laser systems including amplification and chirp compression. Finally, we analyse the concept of quasi time domain spectroscopy based on broadband diode laser systems.

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“…THz frequencies are generated in the biased photoconductor due to the fluctuations in carrier density, which produces a signal via the heterodyne process [9]:…”

Section: Cw Thz Dfg From Photoconductive Emittersmentioning

confidence: 99%

Terahertz Sources

Miles¹,

Naftaly²

2009

Microwave Photonics

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The terahertz (THz) region of the electromagnetic spectrum is commonly defined as that lying at frequencies between 0.1 and10 THz. The frequently-heard expression 'the THz gap' refers to the fact that at these frequencies generation and detection of radiation becomes very difficult using either electronic or optical means. Nevertheless, with the growth of interest in THz research and applications and a great expansion of activities in this area, a large number and variety of sources have been developed and have become widely available. These include THz lasers, laser-activated emitters and electronic devices. Broadly speaking, in applications requiring a continuous-wave narrow-line signal at frequencies below 1 THz, electronic sources predominate. Examples include local oscillators for astronomical instruments and security scanners. On the other hand, lasers and laser-activated emitters are mainly used for broadband THz spectroscopy covering a bandwidth of several THz. This division of functions is likely to persist since electronic THz sources are, by their nature, singlefrequency devices, whereas laser-based sources are either inherently broadband or widely tuneable. Nevertheless, both types of THz emitting devices have found numerous applications, and will be described here. Terahertz Generation from Laser SourcesThe recent rapid expansion of the field of terahertz research and applications owes much of its existence to the development of suitable laser sources and methods of THz generation. These developments fall into two categories: direct emission from far-infrared lasers and optical down-conversion of near-infrared lasers. Owing to the flexibility of the systems and the broad tuning range, down-conversion greatly predominates as the technique of choice, and accounts for the vast majority of work in the THz field.

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Multi-channel homodyne detection of continuous-wave terahertz radiation

Cited by 16 publications

References 13 publications

Terahertz spectroscopy and imaging – Modern techniques and applications

Terahertz spectroscopy and imaging – Modern techniques and applications

Semiconductor Diode Lasers for Terahertz Technology

Terahertz Sources

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