Publications | CW quantum cascade lasers (QCL)

2026

I. La Penna, N. Akikusa, et al., “Electron-to-photon noise transfer in midinfrared semiconductor lasers,” Physical Review Applied, vol. 25, no. 4, 044006, April 2026.
S. Hayashi, et al., “Quantum cascade detectors based on dual-upper-state active regions with a broadband response,” Applied Physics Letters, vol. 128, no. 9, 093308, March 2026.
T. Dougakiuchi, et al., “Experimental investigation of low-frequency noise in quantum-cascade detectors,” Applied Physics Letters, vol. 128, Article ID: 10.1063/5.0299261, February 2026.

2025

J. Pelini, N. Akikusa, et al., “A cavity-enhanced MEMS-based photoacoustic sensor for ppt-level trace-gas detection,” Sensors and Actuators B: Chemical, vol. 430, 137313, May 2025.
Y. Kurosaka, et al., “Coherent synthesis of complex amplitude patterns using a photonic crystal surface-emitting laser,” Optics Express, vol. 33, no. 19, September 2025.
T. Gabbrielli, N. Akikusa, et al., “Shot-noise-limited emission from interband and quantum cascade lasers,” Optics Express, vol. 33, no. 17, pp. 35620-35634, August 2025.

2024

S. Hayashi, et al., “Millimeter-wave generation with a room-temperature nonlinear quantum cascade laser,” Journal of Vacuum Science & Technology B, vol. 42, no. 4, 040601, July 2024.
J. Pelini, N. Akikusa, et al., “High-performance cavity-enhanced photoacoustic trace-gas sensing,” Proceedings of SPIE, vol. 12895, 128950A, March 2024.
S. Hayashi, et al., “An external cavity nonlinear quantum cascade laser with high mid-infrared to terahertz conversion efficiency in the frequency of 1.2-4.5 THz tuning range,” Proceedings of SPIE, March 2024.
T. Gabbrielli, N. Akikusa, et al., “Intensity noise of mid-infrared semiconductor cascade lasers: exploring shot-noise-limited operation,” Proceedings of SPIE, vol. 12905, 129050N, March 2024.

2023

K. Fujita, et al., “Widely tunable room-temperature quantum-cascade laser sources in the sub-THz to THz frequency range,” IRMMW-THz, September 2023.
J. Popp, et al., “Self-consistent simulations of intracavity terahertz comb difference frequency generation by mid-infrared quantum cascade lasers,” Journal of Applied Physics, vol. 133, no. 23, 233103, June 2023.
T. Edamura, et al., “Development of Mid-IR quantum cascade devices and their applications,” Photonics Review, 230202, 2023

2022

K. Fujita, et al., “Broadly tunable lens-coupled nonlinear quantum cascade lasers in the sub-THz to THz frequency range,” Photonics Research, vol. 10, no. 3, pp. 703-710, March 2022.

2021

A. Nakanishi, et al., “Spectral imaging of pharmaceutical materials with a compact terahertz difference-frequency generation semiconductor source,” Analytical Methods, vol. 13, no. 46, pp. 5549-5554, December 2021.
A. Nakanishi, et al., “Polarization Imaging of Liquid Crystal Polymer Using Terahertz Difference-Frequency Generation Source,” Applied Sciences, vol. 11, no. 21, 10260, November 2021.
T. Dougakiuchi, et al., “Application of High-Speed Quantum Cascade Detectors for Mid-Infrared, Broadband, High-Resolution Spectroscopy,” Sensors, vol. 21, no. 17, 5706, August 2021.
L. Consolino, et al., “Direct Observation of Terahertz Frequency Comb Generation in Difference-Frequency Quantum Cascade Lasers,” Applied Sciences, vol. 11, no. 4, 1416, February 2021.
T. Dougakiuchi, et al., “Ultimate response time in mid-infrared high-speed low-noise quantum cascade detectors,” Applied Physics Letters, vol. 118, no. 4, 041101, January 2021.

2020

K. Fujita, et al., “Room temperature terahertz nonlinear quantum cascade lasers and their applications,” IRMMW-THz, pp. 329-330, November 2020.
A. Nakanishi, et al., “Detection of single human hairs with a terahertz nonlinear quantum cascade laser,” Applied Optics, vol. 59, no. 29, pp. 9169-9173, October 2020.
A. Kawai, et al., “Time-stretch infrared spectroscopy,” Communications Physics, vol. 3, no. 1, 152, August 2020.
A. Nakanishi, et al., “Temperature-Insensitive Imaging Properties of a Broadband Terahertz Nonlinear Quantum Cascade Laser,” Applied Sciences, vol. 10, no. 17, 5926, August 2020.
K. Fujita, et al., “Room-temperature terahertz quantum cascade lasers,” Photonics Spectra, vol. 54, no. 6, pp. 32-35, June 2020.
T. Koyama, et al., “A Compact Mid-Infrared Spectroscopy System for Healthcare Applications Based on a Wavelength-Swept, Pulsed Quantum Cascade Laser,” Sensors, vol. 20, no. 12, 3438, June 2020.
A. Nakanishi, et al., “Terahertz imaging with nonlinear quantum-cascade-laser source,” Proceedings of SPIE, vol. 11279, 1127915, March 2020.
T. Sato, et al., “Laser processing of polymeric materials by quantum cascade lasers,” Proceedings of SPIE, vol. 11267, 1126708, March 2020.

2019

T. Dougakiuchi and T.Edamura, “High-speed quantum cascade detector with frequency response of over 20 GHz,” Proc.of SPIE, vol.11197, 111970R-1, 2019.
K. Fujita, et al., ”Sub-terahertz and terahertz generation in long-wavelength quantum cascade lasers,” Nanophotonics 2019, Art no. 238, pp. 2235-2241, Nov. 2019.
M. Hitaka, et al., ”Stacked quantum cascade laser and detector structure for a monolithic mid- infrared sensing device,” Appl. Phys. Lett., vol. 115, no. 16, Oct. 2019.
A. Nakanishi, et al., ”Terahertz imaging with room-temperature terahertz difference-frequency quantum-cascade laser sources, ” Optics Express, vol. 27, issue 3, pp. 1884-1893, 2019.

2018

K. Futita, et al., ”Recent progress in terahertz difference-frequency quantum cascade laser sources,” Nanophotonics 2018, vol 7, no 11, pp 1795-1817, Sep. 2018.
T. Dougakiuchi et al., "Continuous multispectral imaging of surface phonon polaritons on silicon carbide with an external cavity quantum cascade laser," Appl. Phys. Exp., vol. 11, no 3, Feb. 2018, Art no. 032001.

2017

K. Fujita et al., ”Low-threshold room-temperature continuous-wave operation of a terahertz difference-frequency quantum cascade laser source.” Appl. Phys. Exp., vol. 10, no. 8 Jul. 2017. 082102.
I. Galli, N. Akikusa, et al., “Radiocarbon Measurements with Mid-Infrared SCAR Spectroscopy,” 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference, paper CH_3_1, June 2017.
K. Fujita, M. Yamanishi, and T. Edamura, “Recent Research Progress on Quantum Cascade Laser Materials and Structures,” レーザー研究, vol. 45, no. 12, p. 735, December 2017.

2016

K. Fujita et al., ”Ultra-broadband room-temperature terahertz quantum cascade laser sources based on difference frequency generation,” Opt. Express, vol. 24, no. 14, pp. 16357-16365, Jul. 2016.
T. Dougakiuchi et al., ”High photoresponse in room temperature quantum cascade detector based on coupled quantum well design,” Appl. Phys. Lett., vol. 109, no. 26, Dec. 2016, Art no. 261107.
I. Galli, N. Akikusa, et al., “Spectroscopic detection of radiocarbon dioxide at parts-per-quadrillion sensitivity,” Optica, vol. 3, no. 4, pp. 385-388, April 2016.
S. Borri, N. Akikusa, et al., “Tunable Microcavity-Stabilized Quantum Cascade Laser for Mid-IR High-Resolution Spectroscopy and Sensing,” Sensors, vol. 16, no. 2, 238, February 2016
M. Siciliani de Cumis, N. Akikusa, et al., “Microcavity-Stabilized Quantum Cascade Laser,” Laser & Photonics Reviews, vol. 10, no. 1, pp. 153-157, January 2016.
K. Fujita, et al., “Ultra-broadband room-temperature terahertz quantum cascade laser sources based on difference frequency generation,” Optics Express, vol. 24, no. 15, pp. 16357-16365, July 2016.

2015

K. Fujita et al., ”Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper- state active region,” Appl. Phys. Lett., vol. 106, no. 25, Jun. 2015, Art no. 251104.
K. Fujita, et al., “Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper-state active region,” Applied Physics Letters, vol. 106, no. 25, 251104, June 2015.
M. Yamanishi and T. Hirohata, “Manipulation of electrical flicker-noise and line narrowing in free-running quantum cascade-lasers,” Proceedings of SPIE, vol. 9370, 93702U, February 2015.

2014

T. Dougakiuchi et al., ”Broadband tuning of continuous wave quantum cascade lasers in long wavelength (> 10μm) range,” Opt. Express, vol. 22, no. 17, pp. 19930-19935, Aug. 2014.
M. Yamanishi et al., ”Electrical flicker-noise generated by filling and emptying of impurity states in injectors of quantum-cascade lasers,” J. Appl. Phys., vol. 116, no. 18, Nov. 2014, Art no. 183106.
K. Hashimura, et al., “Coagulation and ablation of biological soft tissue by quantum cascade laser with peak wavelength of 5.7 μm,” Journal of Innovative Optical Health Sciences, vol. 7, no. 3, 1450029, March 2014.
M. Yamanishi, et al., “Electrical flicker-noise generated by filling and emptying of impurity states in injectors of quantum-cascade lasers,” Journal of Applied Physics, vol. 116, no. 18, 183106, November 2014.

2013

K. Hashimura, et al., “Selective ablation of WHHLMI rabbit atherosclerotic plaque by quantum cascade laser in the 5.7 μm wavelength range for less-invasive laser angioplasty,” Proceedings of SPIE, vol. 8803, 88030H, June 2013.
K. Hashimura, et al., “Application of a Quantum Cascade Laser in the 5.7 μm Wavelength Range for Less-Invasive Laser Treatment of Atherosclerotic Plaque,” JSAP-OSA Joint Symposia 2013 Abstracts, paper 17a_D4_10, August 2013.
K. Hashimura, et al., “Thermal ablation of WHHLMI rabbit atherosclerotic plaque by quantum cascade laser in the 5.7 μm wavelength range,” Proceedings of SPIE, vol. 8565, 85654C, March 2013.
R. Blanchard, et al., “High-power low-divergence tapered quantum cascade lasers with plasmonic collimators,” Applied Physics Letters, vol. 102, no. 19, 191114, May 2013.

2012

K. Fujita et al., ”Indirectly pumped 3.7 THz InGaAs/InAlAs quantum-cascade lasers grown by metal-organic vapor-phase epitaxy,” Opt. Express, vol. 20, no. 18, pp. 20647-20658, Aug. 2012.
K. Fujita et al., ”Extremely temperature-insensitive continuous-wave quantum cascade lasers,” Appl. Phys. Lett., vol. 101, no. 18, Oct. 2012, Art no. 181111.
F. Cappelli, N. Akikusa, et al., “Subkilohertz linewidth room-temperature mid-infrared quantum cascade laser using a molecular sub-Doppler reference,” Optics Letters, vol. 37, no. 23, pp. 4811-4813, December 2012.
K. Hashimura, et al., “Irradiation Effects on Cholesteryl Ester and Porcine Thoracic Aorta of Quantum Cascade Laser in 5.7-μm Wavelength Range for Less-invasive Laser Angioplasty,” Advanced Biomedical Engineering, vol. 1, pp. 74-80, 2012.
M. Yamanishi, “Theory of intrinsic linewidth based on fluctuation-dissipation balance for thermal photons in THz quantum-cascade lasers,” Optics Express, vol. 20, no. 27, pp. 28465-28478, December 2012.
K. Fujita, et al., “Indirectly pumped 3.7 THz InGaAs/InAlAs quantum-cascade lasers grown by metal-organic vapor-phase epitaxy,” Optics Express, vol. 20, no. 18, pp. 20647-20658, August 2012.
K. Fujita, et al., “Super-linear performance of Dual-upper-state Quantum-Cascade Lasers,” Conference on Lasers and Electro-Optics 2012, paper JW2A.86, May 2012.

2011

K. Fujita et al., ”Extremely broad-gain (Δλ/λ0~0.4), temperature-insensitive (T0~510K) quantum cascade lasers,” Opt. Express, vol. 19, no. 3, pp. 2694-2701, Jan. 2011.
K. Fujita et al., ”High-performance quantum cascade lasers with wide electroluminescence (~600 cm-1), operating in continuous-wave above 100 oC,” Appl. Phys. Lett., vol. 98, no. 23, Jun. 2011, Art no. 231102.
T. Dougakiuchi et al., ”Broadband Tuning of External Cavity Dual-Upper-State Quantum-Cascade Lasers in Continuous Wave Operation,” Appl. Phys. Express, vol. 4, no. 10, Oct. 2011, Art no. 102101.
S. Bartalini, N. Akikusa, et al., “Measuring frequency noise and intrinsic linewidth of a room-temperature DFB quantum cascade laser,” Optics Express, vol. 19, no. 19, pp. 17996-18003, September 2011.
K. Fujita, et al., “High-performance quantum cascade lasers with wide electroluminescence (~600 cm⁻¹), operating in continuous-wave above 100 °C,” Applied Physics Letters, vol. 98, no. 23, 231102, June 2011.

2010

K. Fujita et al., ”High-Performance λ ~ 8.6 μm Quantum Cascade Lasers With Single Phonon- Continuum Depopulation Structures,” IEEE J. Quantum Electron., vol. 46, no. 5, pp. 683-688, May 2010.
K. Fujita et al., ”High-performance, homogeneous broad-gain quantum cascade lasers based on dual-upper-state design,” Appl. Phys. Lett., vol. 96, no. 24, Jun. 2010, Art no. 241107.
K. Fujita et al., ”Extremely high T0-values (~450 K) of long-wavelength (~15μm), low-threshold- current-density quantum-cascade lasers based on the indirect pump scheme,” Appl. Phys. Lett., vol. 97, no. 20, Nov. 2010, Art no. 201109.

2008

M. Yamanishi et al., ”Theory of the Intrinsic Linewidth of Quantum-Cascade Lasers: Hidden Reason for the Narrow Linewidth and Line-Broadening by Thermal Photons,” IEEE J. Quantum Electron., vol. 44, no. 1, pp. 12-29, Jan. 2008.
M. Yamanishi et al., ”Indirect pump scheme for quantum cascade lasers: dynamics of electron- transport and very high T0-Values,” Opt. Express, vol.16, no. 25, pp. 20748-20758, Dec. 2008.

2007

K. Fujita et al., ”Room temperature, continuous-wave operation of quantum cascade lasers with single phonon resonance-continuum depopulation structures grown by metal organic vapor-phase epitaxy,” Appl. Phys. Lett., vol. 91, no. 14, Oct. 2007, Art no. 141121.

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