Fourier-transform external cavity lasers

Breede, M.; Hoffmann, Stefan; Zimmermann, J.; Struckmeier, Jens; Hofmann, Martin R.; Kleine‐Ostmann, Thomas; Knobloch, P.; Koch, Martin; Meyn, Jan-Peter; Matus, Marcelo; Koch, S. W.; Moloney, Jerome V.

doi:10.1016/s0030-4018(02)01451-7

Cited by 48 publications

(20 citation statements)

References 17 publications

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“…Alternatively, photoconductive antennas can be driven by the emission of two independent single-color lasers [49][50][51][52] or a single two-color laser [53][54][55][56]. In this case, the photoconductive structures are referred to as photomixers and emit continuous-wave (cw) radiation with a frequency determined by the difference frequency between the laser lines.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the photoconductive structures are referred to as photomixers and emit continuous-wave (cw) radiation with a frequency determined by the difference frequency between the laser lines. THz radiation can be detected either by slow thermal detectors [53,57] or coherently, using a second photomixer [51,54,58]. Only the latter room-temperature scheme is fast enough for many practical applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Terahertz spectroscopy and imaging – Modern techniques and applications

Jepsen

Cooke

Koch

2010

Laser & Photonics Reviews

1,745

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz spectroscopy and imaging – Modern techniques and applications

Jepsen

Cooke

Koch

2010

Laser & Photonics Reviews

1,745

977

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show abstract

“…However, Matus et al have pointed out the importance of a high spectral purity of the two-colour emission for THz applications [13]. Our original Fourier transform external cavity concept [14] was rather robust but offered only a limited spectral purity because the two major frequency bands selected by the structured end mirror allowed multiple external cavity modes to oscillate. Recently, we have designed a new tunable twocolour laser concept which is shown in Fig.…”

Section: Two-colour Lasers For Photomixingmentioning

confidence: 99%

Semiconductor laser based THz generation and detection

Brenner

Hoffmann²,

Friedrich

et al. 2009

Phys. Status Solidi (c)

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We present different concepts for compact and cost effective THz technology based on semiconductor diode lasers. First, we discuss THz sources starting with modelocked diode lasers for time domain THz sampling, and two‐colour diode lasers for continuous wave THz generation. Then we show how THz radiation can be generated directly out of two‐colour diode lasers and discuss possible schemes for an optimisation of this effect towards application relevant power levels. Finally, we demonstrate that diode lasers can also serve as detectors for THz radiation. We couple the emission of a THz gas laser into the active region of a diode laser and demonstrate that this leads to a variation of the voltage over the p‐n‐junction which is almost proportional to the THz power coupled into the device. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…A different two color laser concept was independently developed by Pan et al [40,41] and our group [42,43]. The laser design is based on intracavity Fourier transformation (Fourier Transform External Cavity Laser, FTECAL).…”

Section: Two-color Lasersmentioning

confidence: 99%

“…The FTECAL was used to generate Terahertz radiation [44] and is widely used in our Terahertz related work. The basic idea of the laser cavity is now highlighted shortly and described in detail elsewhere [43].…”

Section: Two-color Lasersmentioning

confidence: 99%

Generation of Terahertz radiation with two color semiconductor lasers

Hoffmann

Hofmann²

2007

Laser & Photonics Reviews

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Abstract:We discuss and analyze concepts for the generation of tuneable continuous wave terahertz (THz) radiation with two color diode lasers. First, different geometries of two color lasers are reviewed. We show that the THz power of two color lasers in combination with external photomixers becomes sufficient for scanning THz imaging applications when optical amplification with a tapered amplifier is implemented. Then, the concept of direct emission of THz radiation out of a two-color semiconductor laser is reviewed and the potential of this concept with respect to THz bandwidth and achievable THz power is critically analyzed.Scheme of the FTECAL-laser cavity consisting of collimated laser diode, grating lens and mirror.

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Fourier-transform external cavity lasers

Cited by 48 publications

References 17 publications

Terahertz spectroscopy and imaging – Modern techniques and applications

Terahertz spectroscopy and imaging – Modern techniques and applications

Semiconductor laser based THz generation and detection

Generation of Terahertz radiation with two color semiconductor lasers

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