Widely Tunable Monolithic Mid-Infrared Quantum Cascade Lasers Using Super-Structure Grating Reflectors

Guo, Dingkai; Li, Jiun-Yun; Cheng, Liwei; Chen, Xing; Worchesky, Terry; Choa, Fow-Sen

doi:10.3390/photonics3020025

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…Single distributed feedback (DFB) QCL has a very limited tuning range (less than 10 cm −1 ), which limits its usefulness for broadband spectroscopy. There are mainly three types of widely tunable QCLs being developed, that is, external cavity (EC) QCLs [4], an array of DFB-QCLs [5,6], and dual section sampled grating/slot waveguide QCLs [7][8][9]. Among them, EC-QCLs are widely used as reliable broadly tunable equipment.…”

Section: Introductionmentioning

confidence: 99%

Multi-wavelength sampled Bragg grating quantum cascade laser arrays

et al. 2018

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A multi-wavelength sampled Bragg grating (SBG) quantum cascade laser array operating between 7.32 and 7.85 μm is reported. The sampling grating structure, which can be analyzed as a conventional grating multiplied by a sampling function, is fabricated by holographic exposure combined with optical photolithography. The sampling grating period was varied from 8 to 32 μm, and different sampling order (−1st, −2nd, and −3rd order) modes were achieved. We propose that higher-order modes with optimized duty cycles can be used to take full advantage of the gain curve and improve the wavelength coverage of the SBG array, which will be beneficial to many applications.

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Section: Introductionmentioning

confidence: 99%

Multi-wavelength sampled Bragg grating quantum cascade laser arrays

et al. 2018

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“…Single mode power output has also been increased significantly, with over 5 W (1.25 W) tunable peak (continuous wave) output power demonstrated from single devices [10]. Even wider tuning is possible with more advanced grating designs, like the superstructure grating (SSG), with predicted tuning limited only by the gain bandwidth of the laser itself [11].…”

Section: Introductionmentioning

confidence: 99%

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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“…Optical spectroscopy also involves a relatively small system size, weight, and low cost because of the continuous improvements being made to laser and detector devices. In particular, tunable quantum cascade lasers (QCLs) that are based on mid-IR laser sources [2][3][4][5] have been developed to replace optical parametric oscillation sources or carbon dioxide lasers, and can be used in optical spectroscopy. In the past, Raman and photothermal techniques have been some of the most prevalent methods used in optical standoff detection.…”

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confidence: 99%