Sampled grating, distributed feedback quantum cascade lasers with broad tunability and continuous operation at room temperature

Slivken, S.; Bandyopadhyay, N.; Tsao, S.; Nida, Selamnesh; Bai, Y.; Lu, Quanyong; Razeghi, Manijeh

doi:10.1063/1.4732801

Cited by 71 publications

(48 citation statements)

References 14 publications

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“…Such lasers were recently published by Bidaux et al [26]. These lasers are Vernier tuners [27] with integrated heaters, allowing to shift the reflectivity of the gratings in the front and rear section. While these devices profit from extended tuning range and more uniform temperature distribution, the tuning stability of these lasers in iCW are constrained by the thermal transport properties in the device and might be limited to operation at frequencies of few hundreds Hz [28].…”

Section: Effects Of Ar Coatingsmentioning

confidence: 99%

Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis

et al. 2016

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Abstract:We report on the dynamic behavior of dual-wavelength distributed feedback (DFB) quantum cascade lasers (QCLs) in continuous wave and intermittent continuous wave operation. We investigate inherent etaloning effects based on spectrally resolved light-current-voltage (LIV) characterization and perform time-resolved spectral analysis of thermal chirping during long (>5 µs) current pulses. The theoretical aspects of the observed behavior are discussed using a combination of finite element method simulations and transfer matrix method calculations of dual-section DFB structures. Based on these results, we demonstrate how the internal etaloning can be minimized using anti-reflective (AR) coatings. Finally, the potential and benefits of these devices for high precision trace gas analysis are demonstrated using a laser absorption spectroscopic setup. Thereby, the atmospherically highly relevant compounds CO 2 (including its major isotopologues), CO and N 2 O are simultaneously determined with a precision of 0.16 ppm, 0.22 ppb and 0.26 ppb, respectively, using a 1-s integration time and an optical path-length of 36 m. This creates exciting new opportunities in the development of compact, multi-species trace gas analyzers.

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Section: Effects Of Ar Coatingsmentioning

confidence: 99%

Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis

et al. 2016

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“…This architecture is similar to that developed for electrical tuning of telecom lasers [7], and was demonstrated for the QCL in 2012 [8]. Over an order of magnitude, improvement in tuning was demonstrated compared to traditional single mode DFB QCLs.…”

Section: Introductionmentioning

confidence: 69%

Engineering Multi-Section Quantum Cascade Lasers for Broadband Tuning

Slivken

Razeghi

2016

Photonics

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Abstract:In an effort to overcome current limitations to electrical tuning of quantum cascade lasers, a strategy is proposed which combines heterogeneous quantum cascade laser gain engineering with sampled grating architectures. This approach seeks to not only widen the accessible spectral range for an individual emitter, but also compensate for functional non-uniformity of reflectivity and gain lineshapes. A trial laser with a dual wavelength core is presented which exhibits electroluminescence over a 750 cm´1 range and discrete single mode laser emission over a 700 cm´1 range. Electrical tuning over 180 cm´1 is demonstrated with a simple sampled grating design. A path forward to even wider tuning is also described using more sophisticated gain and grating design principles.

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“…6. Shown in Figure 2 reflectivity of one section of the DCG structure with 25 sampling periods (N s ¼ 25) and no net gain.…”

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confidence: 98%

“…5 Towards this end, our group applied sampled grating distributed feedback (SGDFB) technology to a standard laser core in order to demonstrate continuous wave (CW) electrically tunable SGDFB QCLs. 6 This initial attempt showed 50 cm À1 of continuous tuning was possible near k ¼ 4.8 lm with a single device and two control currents. With anti-reflective (AR) coating of the mirror facets, we also showed the ability to access a wide spectral range (361 cm À1 ) using a SGDFB laser array with a standard laser core.…”

mentioning

confidence: 99%

“…The laser wafer chosen is the same used for an earlier publication on ring lasers and has a peak pulsed Fabry-Perot emission wavelength of $4.8 lm. 6 Dual sampled gratings with periods of K 1 ¼ 670 and K 2 ¼ 920 nm, respectively, were patterned into a 300 nm GaInAs grating layer placed 100 nm above the laser core using e-beam lithography and plasma etching. For this experiment, the sampling periods Z 1 and Z 2 were chosen to be 132.2 and 128.3 lm, respectively, which gives an estimating step tuning of 12 cm À1 .…”

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confidence: 99%

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Extended electrical tuning of quantum cascade lasers with digital concatenated gratings

Slivken

Bandyopadhyay

Bai

et al. 2013

Applied Physics Letters

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In this report, the sampled grating distributed feedback laser architecture is modified with digital concatenated gratings to partially compensate for the wavelength dependence of optical gain in a standard high efficiency quantum cascade laser core. This allows equalization of laser threshold over a wide wavelength range and demonstration of wide electrical tuning. With only two control currents, a full tuning range of 500 nm (236 cm−1) has been demonstrated. Emission is single mode, with a side mode suppression of >20 dB.

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Sampled grating, distributed feedback quantum cascade lasers with broad tunability and continuous operation at room temperature

Cited by 71 publications

References 14 publications

Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis

Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis

Engineering Multi-Section Quantum Cascade Lasers for Broadband Tuning

Extended electrical tuning of quantum cascade lasers with digital concatenated gratings

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