Broadly tunable monolithic room-temperature terahertz quantum cascade laser sources

Jung

Applied Physics Letters

et al. 2015

Self Cite

We demonstrate a compact monolithic terahertz source continuously tunable from 1.9 THz to 3.9 THz with the maximum peak power output of 106 μW at 3.46 THz at room temperature. The source consists of an array of 10 electrically tunable quantum cascade lasers with intra-cavity terahertz difference-frequency generation. To increase fabrication yield and achieve high THz peak power output in our devices, a dual-section current pumping scheme is implemented using two electrically isolated grating sections to independently control gain for the two mid-IR pumps.

mentioning

confidence: 99%

Widely tunable terahertz source based on intra-cavity frequency mixing in quantum cascade laser arrays

Jung

Applied Physics Letters

et al. 2015

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J Infrared Milli Terahz Waves

“…Monolithic electrical tuning is more convenient for practical applications. Monolithic tuning range of 3.44 to 4.02 THz was achieved with a dual-section DFG QCL waveguide design [206], and was further expanded to 2.6 to 4.2 THz with a three-section DFG QCL waveguide design [207]. Very recently, by utilizing a low-loss buried-ridge waveguide design and highly dissipative epi-down mounting scheme, room temperature CW operation at 3.6 THz was demonstrated with a continuous power of 3 μW [208].…”

Section: Novel Qcl Sourcesmentioning

confidence: 99%

Terahertz Frequency Metrology for Spectroscopic Applications: a Review

Consolino

Bartalini

Natale

2017

We provide an overview on terahertz (THz) frequency metrology, starting from the nowadays available continuous wave THz sources, discussing their main features such as tunability, spectral purity, and frequency referencing to the primary frequency standards. A comparison on the achieved results in high-precision molecular spectroscopy is given and discussed, and finally, a special emphasis poses on the future developments of this upcoming field.

“…The top 100-nm-thick heavily doped InP layer and the In 0.53 Ga 0.47 As contact layer were removed in the gap between the two metal contacts to prevent current spreading between the DFB sections. 20,24 Figure 2(a, b) shows the schematic and a scanning electron microscope image of a 10 ridgewaveguide QCL array with two 1.2 mm-long DFB sections separated by a 300 µm gap per laser waveguide. The devices are cleaved to have facets at the end of the front and back DFB sections, making the total cavity length of the devices in the array of approximately 2.7 mm.…”

Section: -mentioning

confidence: 99%

Mid-infrared quantum cascade laser arrays with electrical switching of emission frequencies

et al. 2018

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We present a design of quantum cascade laser arrays made of ridge-waveguide devices in which the emission frequency can be electrically switched between several specified values. Our approach relies on fabricating multiple independently-biased distributed feedback grating sections along the laser ridge waveguides. Switchable single-mode lasing from the laser facet is achieved by balancing the injection pumping of the different grating sections. Our method provides a robust solution that can increase the tuning bandwidth of the quantum cascade laser arrays without increasing the size of the array emission aperture.