Quantum cascade laser master-oscillator power-amplifier with 15 W output power at 300 K

Menzel, S.; Diehl, Laurent; Pflügl, C.; Goyal, Anish K.; Wang, Christine; Sánchez, A.; Turner, G. W.; Capasso, Federico

doi:10.1364/oe.19.016229

Cited by 42 publications

(26 citation statements)

References 23 publications

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“…11 Gain guiding is difficult to implement for both ICLs and QCLs, however, because their multilayer active regions (and also the superlattice optical cladding layers of ICLs) cause extensive current spreading. Nevertheless, QCL-based tapered lasers 17,18 and master-oscillator power-amplifiers 19 have operated in lowduty-cycle pulsed mode with index guiding when a deep ridge was etched through the active core of the tapered section. No cw operation was reported and the average powers were quite low, presumably owing to the high threshold current densities.…”

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confidence: 99%

High-power, high-brightness continuous-wave interband cascade lasers with tapered ridges

Bewley

Kim

Canedy

et al. 2013

Applied Physics Letters

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We report tapered-ridge mid-infrared (λ = 3.75 μm) interband cascade lasers emitting up to 403 mW of continuous wave output power at T = 25 °C, with beam quality characterized by M2 = 2.3. One index-guided tapered structure consisted of a single 4-mm-long section with ridge width varying linearly from 5 μm to 63 μm. Another device that combined a narrow ridge of uniform width with a tapered section produced slightly lower maximum output power and brightness.

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confidence: 99%

High-power, high-brightness continuous-wave interband cascade lasers with tapered ridges

Bewley

Kim

Canedy

et al. 2013

Applied Physics Letters

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“…Even in this case, it will be necessary to reduce thermal effects even further. In this respect, recent progress made on the electro-optical efficiency of QCLs at 7 µm [21], and on the output power using a tapered amplifier region on the other hand [22], are very much welcome.…”

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confidence: 99%

Time-resolved spectral characterization of a pulsed external-cavity quantum cascade laser

et al. 2012

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Spectrally tunable narrow-linewidth mid-infrared sources are used in a variety of spectrometric optical systems for detection, identification, and/or quantification of chemical species. However, in the pulsed regime they often display a varying spectrum in time, either from shot-to-shot or during the pulse itself, with consequences on the measurement accuracy, resolution, and repeatability. This is, for instance, the case of pulsed quantum cascade lasers (QCL), mainly because of strong transient thermal effects in the optical waveguide. Unfortunately, little information has been published on this subject because mid-infrared time-resolved spectrometers are extremely scarce. In this paper, we explain how this can be circumvented by using time-gated frequency upconversion in a nonlinear crystal. We apply this principle to characterize a pulsed external cavity QCL (EC-QCL) at 7.8 µm, using AgGaS 2 as the nonlinear crystal and a Q-switched Nd:YAG laser as the pump source. The upconverted near infrared spectrum is conveniently analyzed with a high resolution lambdameter and an optical spectrum analyzer. We evidence frequency chirp at an average rate of -50 MHz/ns and mode hops spanning 15 GHz for the EC-QCL. These results are compared to published data.

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“…The tapered resonant cavity has been widely adopted in near-infrared diodes [5][6][7][8] and midinfrared QCLs [9][10][11][12][13]. The introduction of the tapered region may affect the propagation of the fundamental mode of the light field, threshold current and output power of laser devices.…”

Section: Basic Properties Of a Tapered Thz Qclmentioning

confidence: 99%

Power Amplification and Coherent Combination Techniques for Terahertz Quantum Cascade Lasers

Xie¹,

Li²,

Wang³

et al. 2017

Quantum Cascade Lasers

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Power amplification and coherent combination are important ways to improve the output power and beam quality of single-mode terahertz quantum cascade lasers (THz QCLs). Up to date, the tapered waveguide is the most convenient way to amplify the power of THz QCLs. The self-focusing effect in tapered THz QCLs induces nonmonotonic behaviours of the peak power and far-field beam divergence, which lead to the existence of optimal structural parameters. The surface and lateral grating techniques have also been employed in tapered THz QCLs to further improve the spectral purity. For coherent combinations, the progress of facet-emitting phase-locked arrays of THz QCLs is still limited due to both the lack of the understanding of dynamics of coupled QCLs and the difficulties in designing high-performance coupled waveguides. We will briefly review the developments of coherent arrays of THz QCLs and present a design of monolithic QCL arrays with common coupled cavity to achieve the optical mutual injection, which may provide a new way for coherent combination of THz QCLs.

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Quantum cascade laser master-oscillator power-amplifier with 15 W output power at 300 K

Cited by 42 publications

References 23 publications

High-power, high-brightness continuous-wave interband cascade lasers with tapered ridges

High-power, high-brightness continuous-wave interband cascade lasers with tapered ridges

Time-resolved spectral characterization of a pulsed external-cavity quantum cascade laser

Power Amplification and Coherent Combination Techniques for Terahertz Quantum Cascade Lasers

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