Terahertz Time-Domain Spectroscopy System Driven by a Monolithic Semiconductor Laser

Merghem, K.; Busch, Stefan; Lelarge, F.; Koch, Martin; Ramdane, A.; Balzer, Jan C.

doi:10.1007/s10762-017-0401-2

Cited by 26 publications

(16 citation statements)

References 19 publications

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“…This is usually smaller than in other approaches. Values up to 800 GHz as difference frequency were achieved (Moon et al, 2014) in contrast to 30 THz achieved with external cavity lasers (Hoffmann et al, 2006).…”

Section: Two-color Lasersmentioning

confidence: 77%

“…Another field of research was the change of the wavelength region of the pumping lasers to 1550 nm (Sartorius et al, 2012;Fice et al, 2010;Ryu et al, 2012;Rymanov et al, 2013;Göbel et al, 2013;Hisatake et al, 2014) or 1 µm (Kitahara et al, 2013;Tanabe et al, 2009) and 1.3 µm (Moon et al, 2014). The development of new photomixers based on telecommunication diode mixers shifted the focus to diode laser systems in the telecommunication range which makes industry components as laser sources easily accessible.…”

Section: Introductionmentioning

confidence: 99%

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Near Infrared Diode Laser THz Systems

Brenner

Gwaro

et al. 2018

Adv. Radio Sci.

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Abstract. The generation and detection of radiation in the THz frequency range can be achieved with many different electronic and photonic concepts. Among the many different photonic THz systems the most versatile are based on diode lasers. In this paper we describe and review the different concepts and optimization ideas for diode laser based THz systems in order to achieve the best performance for different types of THz setups.

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Section: Two-color Lasersmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Near Infrared Diode Laser THz Systems

Brenner

Gwaro

et al. 2018

Adv. Radio Sci.

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“…Although this laser is sold as a longitudinal multimode laser with no hint of mode locking capabilities, there was the conjecture from previous experiments that the broad emission spectrum with a full-width half-maximum exceeding 10 nm is a sign of four-wave mixing mode locking in this single section laser [25,26]. In this case, the laser emits linearly chirped pulses, which can be compressed by the anomalous dispersion of a standard single mode fiber (SMF) [24].…”

Section: Laser Systemmentioning

confidence: 99%

“…So far only one demonstration for THz TDS using a monolithic laser diode exists [24], wherein a research grade laser diode was used to drive a standard THz TDS system. The bandwidth was limited to 800 GHz with a peak dynamic range of 45 dB.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Time-Domain Spectroscopy Based on Commercially Available 1550 nm Fabry–Perot Laser Diode and ErAs:In(Al)GaAs Photoconductors

et al. 2019

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THz time-domain spectroscopy (TDS) is a promising tool for quality control purposes in industrial applications, but the high cost and the relatively large laser sources still make it difficult to use the full potential of the technology for a decent price. In this work, a THz TDS system, which uses a commercially available Fabry–Perot laser diode emitting at 1550 nm, is presented. By dispersion compensation, pulses with a duration of 544 fs were generated, resulting in THz radiation with a bandwidth of 1.4 THz and a peak dynamic range of 56 dB with state-of-the-art ErAs:In(Al)GaAs photoconducting antennas. These results are compared with those of a conventional and expensive fiber laser system with a 90 fs pulse duration.

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“…This condition is fulfilled by using a monolithic mode-locked laser diode (MLLD) in an approach we call ultra-high repetition rate terahertz time-domain spectroscopy (UHRR THz TDS). This approach has first been demonstrated by Merghem et al [ 19 ] and system-theoretically analyzed by the authors [ 20 ]. Besides its suitability for photonic beam steering, UHRR THz TDS has the advantage that the light source has the potential for monolithic integration, is electrically pumped, supplies an optical power of around 100 mW without amplification, and operates at 1550 nm telecom wavelengths [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Wideband Beam Steering Concept for Terahertz Time-Domain Spectroscopy: Theoretical Considerations

Kolpatzeck

Haring

et al. 2020

Sensors

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Photonic true time delay beam steering on the transmitter side of terahertz time-domain spectroscopy (THz TDS) systems requires many wideband variable optical delay elements and an array of coherently driven emitters operating over a huge bandwidth. We propose driving the THz TDS system with a monolithic mode-locked laser diode (MLLD). This allows us to use integrated optical ring resonators (ORRs) whose periodic group delay spectra are aligned with the spectrum of the MLLD as variable optical delay elements. We show by simulation that a tuning range equal to one round-trip time of the MLLD is sufficient for beam steering to any elevation angle and that the loss introduced by the ORR is less than 0.1 dB. We find that the free spectral ranges (FSRs) of the ORR and the MLLD need to be matched to 0.01 % so that the pulse is not significantly broadened by third-order dispersion. Furthermore, the MLLD needs to be frequency-stabilized to about 100 MHz to prevent significant phase errors in the terahertz signal. We compare different element distributions for the array and show that a distribution according to a Golomb ruler offers both reasonable directivity and no grating lobes from 50 GHz to 1 THz.

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Terahertz Time-Domain Spectroscopy System Driven by a Monolithic Semiconductor Laser

Cited by 26 publications

References 19 publications

Near Infrared Diode Laser THz Systems

Near Infrared Diode Laser THz Systems

Terahertz Time-Domain Spectroscopy Based on Commercially Available 1550 nm Fabry–Perot Laser Diode and ErAs:In(Al)GaAs Photoconductors

Wideband Beam Steering Concept for Terahertz Time-Domain Spectroscopy: Theoretical Considerations

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