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Micromachines
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Quantum Cascade Laser: Physics, Technology and Applications
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Quantum Cascade Laser: Physics, Technology and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 4955

Special Issue Editor

Dr. Feihu Wang

E-Mail Website
Guest Editor
Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Interests: quantum cascade laser; laser physics; infrared and terahertz technology; ultrafast optics; V-III semiconductor

Special Issue Information

Dear Colleagues,

The quantum cascade laser (QCL) is a unipolar quantum device fully based on a semiconductor technology platform. Its invention was marked as one of the top photonic breakthroughs since the establishment of quantum mechanics theory and brought with it hope and expectations. Although QCL has undergone surprising development in physics, technology, and applications in the past 27 years, there are still some vital issues that have not found solutions, e.g., room temperature QCL with direct terahertz gain has yet to be realized; little progress has been achieved for years on the overall efficiency of QCL; many technological challenges in the long-wave infrared range still need to be overcome; the nature of pulse generation and the limiting factors for obtaining shorter pulse widths and higher peak power in QCL need to be further explored; the application of mid-infrared and terahertz waves is far below our expectation, etc. This junction is a good time for us to conclude our past achievements, present our recent outcomes, and discuss the future prospects of QCLs.

Accordingly, this Special Issue seeks to showcase research papers, communications, and review articles that focus on the theoretical and experimental progress of QCLs in physics, technology, and applications.

We look forward to receiving your submissions!

Dr. Feihu Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • quantum cascade lasers
  • laser dynamics
  • optical nonlinearity
  • mode-locking
  • high performance devices
  • infrared and terahertz technology
  • frequency comb
  • QCL applications

Published Papers (2 papers)

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Research

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10 pages, 2239 KiB  
Article
Correlation of Superlattice Cross-Plane Thermal Conductivity with Emission Wavelength in InAlAs/InGaAs Quantum Cascade Lasers
by Alejandro M. Villalobos Meza, Monas Shahzad, Dagan Hathaway, Hong Shu and Arkadiy Lyakh
Micromachines 2022, 13(11), 1934; https://doi.org/10.3390/mi13111934 - 9 Nov 2022
Cited by 1 | Viewed by 1464
Abstract
The low cross-plane thermal conductivity of quantum cascade lasers (QCLs) is a significant limitation in their Continuous-Wave (CW) performance. Structural parameters such as individual layer thicknesses and interface density vary for QCLs with different target emission wavelengths, and these design parameters are expected [...] Read more.
The low cross-plane thermal conductivity of quantum cascade lasers (QCLs) is a significant limitation in their Continuous-Wave (CW) performance. Structural parameters such as individual layer thicknesses and interface density vary for QCLs with different target emission wavelengths, and these design parameters are expected to influence the cross-plane thermal conductivity. Though previous works have used theoretical models and experimental data to quantify thermal conductivity, the correlation between target wavelength and thermal conductivity has yet to be reported for QCLs. In this work, we observe a general trend across a group of QCLs emitting from 3.7 to 8.7 µm: as the QCL design changes to reduce wavelength, the thermal conductivity decreases as well. Numerically, we measured an approximate 70% reduction in thermal conductivity, from 1.5 W/(m·K) for the 8.7 µm device, to 0.9 W/(m·K) for the 3.7 µm device. Analysis of these structures with the Diffuse Mismatch Model (DMM) for thermal boundary resistance (TBR) shows that the largest contribution of this effect is the impact of superlattice interface density on the thermal conductivity. The observed changes in conductivity result in significant changes in projected CW optical power and should be considered in laser design. Full article
(This article belongs to the Special Issue Quantum Cascade Laser: Physics, Technology and Applications)
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Review

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18 pages, 3237 KiB  
Review
Ultrafast Pulse Generation from Quantum Cascade Lasers
by Feihu Wang, Xiaoqiong Qi, Zhichao Chen, Manijeh Razeghi and Sukhdeep Dhillon
Micromachines 2022, 13(12), 2063; https://doi.org/10.3390/mi13122063 - 24 Nov 2022
Cited by 5 | Viewed by 2779
Abstract
Quantum cascade lasers (QCLs) have broken the spectral barriers of semiconductor lasers and enabled a range of applications in the mid-infrared (MIR) and terahertz (THz) regimes. However, until recently, generating ultrashort and intense pulses from QCLs has been difficult. This would be useful [...] Read more.
Quantum cascade lasers (QCLs) have broken the spectral barriers of semiconductor lasers and enabled a range of applications in the mid-infrared (MIR) and terahertz (THz) regimes. However, until recently, generating ultrashort and intense pulses from QCLs has been difficult. This would be useful to study ultrafast processes in MIR and THz using the targeted wavelength-by-design properties of QCLs. Since the first demonstration in 2009, mode-locking of QCLs has undergone considerable development in the past decade, which includes revealing the underlying mechanism of pulse formation, the development of an ultrafast THz detection technique, and the invention of novel pulse compression technology, etc. Here, we review the history and recent progress of ultrafast pulse generation from QCLs in both the THz and MIR regimes. Full article
(This article belongs to the Special Issue Quantum Cascade Laser: Physics, Technology and Applications)
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