Article
Optics
Josephine Nauschuetz, Hedwig Knoetig, Robert Weih, Julian Scheuermann, Johannes Koeth, Sven Hoefling, Benedikt Schwarz
Summary: This article presents GaSb-based interband cascade lasers (ICLs) operating at a center wavelength of 6.12 μm in continuous-wave mode up to a maximum temperature of 40 °C. The performance of the devices is improved by adjusting the Ga1-xInxSb layer thickness in the active region to reduce valence intersubband absorption. The optimization of the device design and electron injector rebalances the electron and hole concentrations, resulting in low threshold current densities and power consumption, making them suitable for mobile and compact sensing systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Yanjiao Guan, Ruixuan Sun, Ning Zhuo, Xiyu Lu, Jinchuan Zhang, Shenqiang Zhai, Junqi Liu, Shuman Liu, Lijun Wang, Fengqi Liu
Summary: We have successfully designed and fabricated a dual-wavelength switchable quantum cascade laser (QCL) by optimizing the design of a homogeneous active region and combining superposed distributed feedback gratings. Coaxial, single-mode emissions at two different wavelengths were achieved only through adjusting the bias voltage. The dual-wavelength QCL operates at room temperature and provides output powers of above 30 mW and 75 mW for single-mode emission at 7.61 μm and 7.06 μm, respectively. The simplified fabrication process and easy wavelength control make our designed dual-wavelength QCL very attractive for developing miniature multi-species gas sensing systems.
CHINESE OPTICS LETTERS
(2023)
Article
Optics
Weihang Cao, Zhengdong Dai, Run Fang, Zhongyu Wang, Yuchen Xue, Bo Xiao, Huiying Xu, Zhiping Cai
Summary: Continuous-wave deep red lasers at 696.6 and 698.6 nm were achieved in a Pr3+:YLF crystal pumped by an InGaN laser diode. A Lyot filter was used as a birefringent filter in the cavity to select the wavelengths, and the lasers achieved maximum output powers of 1.36 and 3.11 W, respectively. The output powers of these lasers are the highest reported so far, and this is the first demonstration of scaling the output power of the Pr3+:YLF laser to the watt level at around 696 nm. The experimental phenomena were also explained through theoretical analysis and simulation.
CHINESE OPTICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Qiangqiang Guo, Jinchuan Zhang, Chao Ning, Ning Zhuo, Shenqiang Zhai, Junqi Liu, Lijun Wang, Shuman Liu, Zhiwei Jia, Fengqi Liu
Summary: In this study, a selective electrical isolation scheme combined with surface passivation was designed to achieve continuous-wave operation of microcavity quantum cascade lasers. This design significantly reduces the injection current while ensuring low optical loss and a high quality factor for the whispering-gallery mode, thereby reducing thermal dissipation power. The applicability of this design to various whispering-gallery-mode resonators, especially large cavities, has great potential for the development of microcavity quantum cascade lasers as continuous-wave mid-infrared light sources for photonic integrated circuits and microcavity physics.
Article
Nanoscience & Nanotechnology
Shuaihao Ji, Shaoqun Liu, Xiuji Lin, Yingyi Song, Bo Xiao, Qichen Feng, Wensong Li, Huiying Xu, Zhiping Cai
Summary: The development of visible fiber lasers has expanded their applications in various fields. Green laser oscillation in Ho3+ active fibers has helped bridge the green gap, allowing for continuous tunable laser operation at the true-green wavelength. The achieved output power of up to 0.98 W at a center wavelength of 543.1 nm represents the highest power level demonstrated from a visible Ho3+-doped fiber laser to date.
Article
Optics
Liying Lin, Ying Xue, Jie Li, Wei Luo, Jie Huang, Kei May Lau
Summary: The study reports the experimental results of InP-based InAs QDash microdisk lasers grown on silicon, demonstrating their continuous-wave operation in the C and L bands, achieving the lowest threshold and highest operating temperature. Experimental results show that the dominant lasing wavelength of MDLs is influenced by the thickness and diameter of the MDLs.
Article
Physics, Multidisciplinary
Huan Wang, Jin-Chuan Zhang, Feng-Min Cheng, Zeng-Hui Gu, Ning Zhuo, Shen-Qiang Zhai, Feng-Qi Liu, Jun-Qi Liu, Shu-Man Liu, Zhan-Guo Wang
Summary: The study presents a modified InP-based quantum cascade laser with a broad gain spectrum, capable of high-power output and wide frequency coverage at a wavelength of 11.8 μm in CW mode. It demonstrates excellent performance at both 283K and 293K, making it suitable for applications such as gas detection.
Article
Multidisciplinary Sciences
Paolo Micheletti, Urban Senica, Andres Forrer, Sara Cibella, Guido Torrioli, Martin Frankie, Mattias Beck, Giacomo Scalari, J'rome Faist
Summary: Quantum cascade lasers (QCLs) offer an intriguing opportunity for generating on-chip optical dissipative Kerr solitons (DKS). Recent observations of DKS in mid-infrared ring QCLs have paved the way for achieving DKS at longer wavelengths. Terahertz ring QCLs with anomalous dispersion were realized using a waveguide planarization technology platform. A concentric coupled waveguide approach was implemented for dispersion compensation, while a passive broadband bullseye antenna improved power extraction and far field. The presence of solitons was confirmed through hysteric behavior, phase difference measurements, and intensity time profile reconstruction, which matched well with numerical simulations based on the Complex Ginzburg-Landau Equation (CGLE).
Article
Materials Science, Multidisciplinary
Tsung-Tse Lin, Li Wang, Ke Wang, Thomas Grange, Stefan Birner, Hideki Hirayama
Summary: A GaAs/AlGaAs-based terahertz quantum cascade laser with high peak power and average power is demonstrated. By increasing the electron density at the active region through high doping, high output power is achieved. The design optimization using variable quantum well and barrier height allows for the saturation of peak gain.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Quantum Science & Technology
Manish Kumar Mehta, Joseph Thomas Andrews, Pratima Sen
Summary: In this paper, a novel method is proposed to overcome the limitations of exciton and biexciton states only appearing at low temperatures, as well as the complexity of using lasers with different polarization states for CNOT operations. By utilizing ultrafast magnetic pulse CNOT gate operation in Mn-doped InSb quantum dots at room temperature, with only a circularly polarized laser pulse, the proposed method shows a significantly large fidelity calculation for CNOT gate.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Bin-Bin Zhao, Xing-Guang Wang, Cheng Wang
Summary: The study demonstrates that tilted optical feedback with a misaligned reflection mirror can trigger quantum cascade lasers to generate low-frequency oscillations, including irregular pulse oscillations and square wave oscillations. The oscillation period is in the microsecond range, generally decreasing with increasing tilt angle, and the duty cycle of the square waves is tunable through varying the tilt angle. It is also noted that weak feedback strength or low pump current results in rare occurrence of pulse oscillations.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Xiaoxu Yu, Hongwei Chu, Fangyuan Zha, Han Pan, Shengzhi Zhao, Dechun LI, Zhongben Pan
Summary: This letter reports a watt-level laser diode (LD)-pumped -2.3-micron Tm3+-doped laser, achieving a continuous wave output power of 1.89 watts, setting a new highest record.
Article
Physics, Applied
Wenxiang Huang, Shiyu Hu, Junjie Tu, Lifang Zhang, Kekai Tao, Peng Wang
Summary: In this work, a continuous-wave InAs-based interband cascade laser emitting at a wavelength of 4.58 μm is reported. The laser operates at high temperatures, with a maximum temperature of 64 degrees C achieved, which is 29 degrees C higher than previously reported values for similar lasers. At 20 degrees C, an output power of 20 mW was obtained using a 10-μm x 2-mm ridge waveguide device with one facet coated for high reflection and epilayer-down mounting.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Yunshan Zhang, Jingyu Zou, Wanxin Zheng, Kai Feng, Bin Xu, Zhenfang Yu
Summary: This study focuses on diode-pumped continuous-wave Pr-doped YLF laser and its frequency doubling to 320 nm, achieving a maximum output power of 3.44 W for the 640 nm fundamental wave and 1.01 W for the 320 nm ultraviolet radiation using an LBO crystal. The use of a type-I phase-matched LBO crystal as a frequency doubler is crucial in achieving high-power ultraviolet radiation.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
G. Marschick, M. David, E. Arigliani, N. Opacak, B. Schwarz, M. Giparakis, A. Delga, M. Lagree, T. Poletti, V. Trinite, A. Evirgen, B. Gerard, G. Ramer, R. Maulini, J. Butet, S. Blaser, A. M. Andrews, G. Strasser, B. Hinkov
Summary: Quantum cascade detectors (QCDs) operate at zero external bias with low dark-current, making them suitable for heterodyne detection in long-wave infrared (LWIR) free space optical communication systems. The study compares single and multi-period QCDs to optimize responsivity and noise behavior, revealing significant differences in room-temperature responsivities between the two types of devices.
