Tunable continuous-wave terahertz generation/detection with compact 155 μm detuned dual-mode laser diode and InGaAs based photomixer

Kim, Namje; Han, Shihui; Ko, Hyunsung; Leem, Young Ahn; Ryu, Han-Cheol; Lee, Chul Wook; Lee, Donghun; Jeon, Min Yong; Noh, Sam Kyu; Park, Kyung Hyun

doi:10.1364/oe.19.015397

Cited by 62 publications

(21 citation statements)

References 20 publications

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“…Therefore, different groups have been working on compact two-color diode laser systems using monolithic approaches with Y-shaped waveguides or separate DFB sections, as well as external cavity schemes [287][288][289][290][291][292]. The first biomedical application of such diode laser based CW systems has been imaging of a human liver with metastasis [7].…”

Section: Diode Laser Systems Emitting Continuous Wave Terahertz Radiamentioning

confidence: 99%

Diode laser based light sources for biomedical applications

Müller

Marschall

Jensen

et al. 2012

Laser & Photonics Reviews

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Diode lasers are by far the most efficient lasers currently available. With the ever-continuing improvement in diode laser technology, this type of laser has become increasingly attractive for a wide range of biomedical applications. Compared to the characteristics of competing laser systems, diode lasers simultaneously offer tunability, high-power emission and compact size at fairly low cost. Therefore, diode lasers are increasingly preferred in important applications, such as photocoagulation, optical coherence tomography, diffuse optical imaging, fluorescence lifetime imaging, and terahertz imaging. This review provides an overview of the latest development of diode laser technology and systems and their use within selected biomedical applications. 670 nm external cavity diode laser for Raman spectroscopy built on a 13 × 4 mm 2 microbench (Copyright FBH/Schurian.com).

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Section: Diode Laser Systems Emitting Continuous Wave Terahertz Radiamentioning

confidence: 99%

Diode laser based light sources for biomedical applications

Müller

Marschall

Jensen

et al. 2012

Laser & Photonics Reviews

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“…In addition, cw THz systems are highly attractive even for low-resolution spectroscopy and sensing, to avoid the large footprint and costs of mode-locked photo-switching systems. Systems based on thermally tuned distributedfeedback (DFB) lasers [7,8,9] are therefore very attractive for low-cost and mobile THz spectroscopy, sensing and imaging. Outside a research laboratory, temperature robustness is often an issue.…”

Section: Introductionmentioning

confidence: 99%

On the thermal dependence of the generation of terahertz radiation by photomixing

Campbell

Ackemann

Fraser

et al. 2014

Semicond. Sci. Technol.

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Abstract. We study the temperature dependence of the generation of Terahertz (THz) waves by photomixing in GaAs based antennas, grown at low-temperatures. For excitation with 780 nm light, the generated photocurrent increases by 15%, if the temperature is increased from 18 • C to 60 • C, whereas the generated THz power increases by 28%. The results show that the operation of THz antennas is robust with respect to changes in the ambient temperature and thus support the possibility of robust, potentially mobile devices without the need for a careful temperature control of the antenna structure.

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“…Because of the same grating, the tuning range of the beat source was limited within from 0.1 THz to 0.57 THz. In 2011, the detuned DML operating at 1.55 μm was proposed to enlarge the tuning range [6]. The operating wavelengths of each DFB LD are detuned by 5 nm to increase the beat frequency tuning range.…”

Section: Introductionmentioning

confidence: 99%

A tunable continuous-wave terahertz generator based on 1.3-μm dual-mode laser diode and travelling-wave photodiode

et al. 2013

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We demonstrate the tunable continuous-wave (CW) terahertz generator based on the λ/4 phase-shifted 1.3 μm dualmode laser diode (DML) and travelling-wave photodiode (TWPD). The DML and TWPD operate as an optical beat source and terahertz photomixer, respectively. The laser diodes (LDs) operating at the 1.3 μm have more suitable characteristics as optical beat sources than the LDs operating at 1.55 μm because of their high efficiency and better thermal stability. The micro-heaters are integrated on top of each DFB LD for mode beat frequency tuning. The fabricated DML was continuously tuned from 230 GHz to 1485 GHz by increasing the temperature of each DFB section independently via integrated micro-heaters. The high-speed TWPD with an InGaAs absorber was designed and fabricated to efficiently generate the photomixing terahertz CW. A complementary log-periodic antenna was integrated with the TWPD to radiate the generated terahertz wave with minimum reflection in the wide frequency range. The terahertz characteristics of the tunable CW terahertz generator based on the DML and TWPD were measured in a fibercoupled, homodyne terahertz photomixing system. Our results of the tunable CW terahertz generator show the feasibility of a compact and highly efficient CW terahertz spectrometer and imager.

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Tunable continuous-wave terahertz generation/detection with compact 155 μm detuned dual-mode laser diode and InGaAs based photomixer

Cited by 62 publications

References 20 publications

Diode laser based light sources for biomedical applications

Diode laser based light sources for biomedical applications

On the thermal dependence of the generation of terahertz radiation by photomixing

A tunable continuous-wave terahertz generator based on 1.3-μm dual-mode laser diode and travelling-wave photodiode

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