Two-colour Fabry-Perot laser with terahertz primary mode spacing

Osborne, S.; O’Brien, Stephen; Buckley, Kevin; Fehse, R.; Patchell, J.; Kelly, Brian; O’Gorman, J.; O’Reilly, Eoin P.

doi:10.1049/el:20073358

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Monolithic and hybrid integration of dual-wavelength diode laser (DWL) sources increase compactness and the correlation between the lasing modes, so signals can be generated with reduced phase noise [5]. Amid the various reported configurations of DWLs, simultaneous emission of two longitudinal modes within the same cavity is particularly attractive because the beam path and polarization of the two modes are automatically matched, and the beating frequency is largely insensitive to temperature variations of the surroundings [5,6,7]. A second approach for generating THz pulses is to use ultrafast semiconductor mode locked laser diodes (SMLLDs) operating at THz repetition frequencies.…”

Section: Introductionmentioning

confidence: 99%

Photonic integrated circuits for terahertz source generation

Hou

Song

Hou

et al. 2020

IET Optoelectronics

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We introduce four kinds of terahertz photonics components based on photonic integrated circuits (PICs). A PICbased integrated optoelectronic synthesizer for THz communications is described, which can be tuned continuously over the range 0.254 THz to 2.723 THz using photomixing. A laterally-coupled dual-grating distributed feedback laser (DFB) diode integrated with an electroabsorption modulator is used to generate an 820 GHz beat signal. THz signal production is reported using a dual-wavelength DFB diode laser with a two-section phase-shifted sampled Bragg grating. Finally, a THz source at 640 GHz, based on a sampled grating distributed Bragg reflector semiconductor mode-locked laser diode, is reported offering superior reproducibility, controllability and a wider operation range than other reported mode-locked THz laser diodes. Each of these sources is a monolithic construction emitting light at 1.5 µm. The light can be amplified in an EDFA, delivered over silica optical fibre and used to generate THz radiation via a photodiode antenna or photoconductive antenna in a remote location.

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Section: Introductionmentioning

confidence: 99%

Photonic integrated circuits for terahertz source generation

Hou

Song

Hou

et al. 2020

IET Optoelectronics

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“…Furthermore, the two-frequency laser allows an inherent spatial overlap of two laser frequencies and stable beat frequencies due to the common-mode rejection effect which is attributed to the compensation of the same fluctuations in the laser frequencies at the beat frequency [22]. Some concepts for two-frequency semiconductor lasers have been developed [27-32, 34, 35], very recently also one within a completely integrated concept [36]. However, achieving stability and spectral purity of dual-mode emission in long external cavities is still one of the open questions.…”

Section: Introductionmentioning

confidence: 99%

Generation and spectroscopic application of tunable continuous-wave terahertz radiation using a dual-mode semiconductor laser

Park

Sydlo

Fischer

et al. 2008

Meas. Sci. Technol.

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We present a tunable continuous-wave terahertz radiation source based on photomixing of a tunable dual-mode semiconductor laser on a log-periodic antenna. The discontinuously tunable dual-mode emission of the laser is achieved by spectrally filtered feedback in a double-external-cavity configuration. Two different two-frequency lasing regimes have been identified: pure dual-mode and dual-mode-comb emission. We spectrally investigate the laser emission in these two regimes and study the consequences for the generation of terahertz radiation. Under pure dual-mode emission, we achieve higher power, higher coherence and good tunability of the THz radiation. We demonstrate by detecting absorption lines of water vapor and hydrochloric acid gas that our concept for a tunable continuous-wave terahertz radiation source offers attractive properties for spectroscopic applications.

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