Swept away [quantum-well infrared photodetectors]

Liu, H.C.; Dudek, R.; Oogarah, T.; Grant, P. D.; Wasilewski, Z. R.; Schneider, Harald; Steinkogler, S.; Walther, M.; Koidl, P.

doi:10.1109/mcd.2003.1263454

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…To perform our experimental study the laser is mounted at the end of a 50 microstrip line and connected to it by short bonding wires. The modulation signal is supplied by a RF synthesizer (Anritsu MG3693B) through a Bias‐T (SHF Communication Technologies BT45 B) and the optical signal is detected with an ultrafast QWIP of 65 GHz band pass . The frequency response of the microstrip laser measured with this experimental set up is reported in Fig.…”

Section: Methodsmentioning

confidence: 99%

Injection locking of mid‐infrared quantum cascade laser at 14 GHz, by direct microwave modulation

St-Jean

Amanti

Bernard

et al. 2014

Laser & Photonics Reviews

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Compact laser sources operating in mid infrared spectral region with stable emission are important for applications in spectroscopy and wireless communication. Quantum cascade lasers (QCL) are unique semiconductor sources covering mid infrared frequency range. Based on intersubband transitions, the carrier lifetime of these sources is in the ps range. For this reason their frequency response to direct modulation is expected to overcome the limits of standard semiconductor lasers. In this work injection locking of the roundtrip frequency of a QCL emitting at 9 μm is reported. Inter modes laser frequency separation is stabilized and controlled by an external microwave source. Designing an optical waveguide embedded in a microstrip line a flat frequency response to direct modulation up to 14 GHz is presented. Injection locking over MHz frequency range at 13.7 GHz is demonstrated. Numerical solutions of injection locking theory are discussed and presented as tool to describe experimental results.

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Section: Methodsmentioning

confidence: 99%

Injection locking of mid‐infrared quantum cascade laser at 14 GHz, by direct microwave modulation

St-Jean

Amanti

Bernard

et al. 2014

Laser & Photonics Reviews

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“…With another f/4 ZnSe lens, the QCL MIR emission is then collected and in turn focused on a 80ϫ 80 m 2 liquid nitrogen cooled quantum well infrared photodetector ͑QWIP͒ with a responsivity of 50 A / mW for a bias of Ϫ3 V ͑dc current 250 A͒ at 8 m and an electrical bandwidth of 8 GHz. 12 The MIR modulation signal is amplified with an 18 GHz 25 dB preamplifier and recorded by an HP 8560A spectrum analyzer with 2.9 GHz bandwidth. A Vigo PCI-L-2TE-3 detector ͑bandwidthϽ 20 MHz͒ is also used for the MIR measurement.…”

mentioning

confidence: 99%

Optically induced fast wavelength modulation in a quantum cascade laser

Chen

Martini

Park

et al. 2010

Applied Physics Letters

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An optically induced fast wavelength shift is demonstrated in a standard middle infrared (MIR) quantum cascade laser (QCL) by illuminating the front facet with a femtosecond (fs) near infrared (NIR) laser, allowing fast optical frequency modulation (FM) for free space optical communication (FSOC) and FM spectroscopy. Using an etalon as a narrow band-pass wavelength filter, the wavelength modulation (WM) was clearly observed at frequencies up to 1.67 GHz. This approach can also be used for wavelength conversion and might be extended to QCLs operating in different wavelength regions.

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“…The uniform free carrier density in QWIPs is often described by its active wells' ground state 2D electron density, which is related to their doping density and Fermi energy. [ 13 ] These electrons are scattered in an emission-capture model to result in a 3D mobile carrier contribution above the wells' barriers. Since the Fermi energy affects both absorption quantum effi ciency and detectivity via 2D carrier density, we estimated that a relatively high doping density of ∼ 3 × 10 18 cm − 3 is a reasonable choice to balance these traits with high temperature operation.…”

Section: Doi: 101002/adma201103372mentioning

confidence: 99%