Article
Materials Science, Multidisciplinary
Wenxin Liu, Yuqian Zu, Yangxiao Wang, Zhonghan Zhang, Jie Liu, Liangbi Su
Summary: In this study, Tm:SrF2 SCF was successfully grown and its acousto-optically Q-switched properties were investigated. The results suggest that Tm:SrF2 SCF shows promising peak power performance, indicating its potential as a laser gain material.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Instruments & Instrumentation
Huawen Hu, Haizhou Huang, Wen Weng, Hui Zheng, Wenxiong Lin
Summary: This study presented a 2-mu m wavelength-switchable Tm/Ho composite laser with a compact hybrid cavity and changeable output couplers, demonstrating different laser outputs in various operating modes. The Tm laser and Ho laser achieved distinct power and pulse width characteristics, while the laser source showed advantages such as accessibility, multifunctionality, and miniaturization.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yagiz Morova, Mauro Tonelli, Alphan Sennaroglu
Summary: This study reports the first waveguide laser operation of Tm3+:BaY2F8 crystal near the wavelength of 2 μm. Two waveguides were fabricated using femtosecond laser inscription, and lasing experiments were performed in the waveguides. Results showed that Tm3+:BaY2F8 crystal holds significant potential in the development of compact, efficient, femtosecond laser written waveguide lasers near 2 μm.
Article
Optics
Patrick Forster, Clement Romano, Julian Schneider, Marc Eichhorn, Christelle Kieleck
Summary: A study on a Tm3+: Ho3+ co-doped free-space single-oscillator fiber laser is conducted, with a focus on the power scalability of emission wavelengths from 2.1 μm to 2.2 μm. The research demonstrates stable high-power laser operation with output powers above 10 W and record powers of 262 W and 77 W using volume Bragg gratings at 2.1 μm and 2.2 μm, respectively.
Article
Optics
Xuejian Dong, Bin Zhang, Xiaoli Sun, Yuechen Jia, Feng Chen
Summary: In this work, a tunable 1.8-mu m laser based on a Tm:YVO4 cladding waveguide fabricated using femtosecond laser direct writing was demonstrated. Efficient thulium laser operation was achieved in a compact package by adjusting and optimizing the pump and resonant conditions of the waveguide laser design. The study also investigated the lasing performance using output couplers with different reflectivity and showed the potential for compact and integrated mid-infrared laser sources.
Article
Biochemistry & Molecular Biology
Jingcheng Shang, Yizhou Liu, Shengzhi Zhao, Yuefeng Zhao, Yuzhi Song, Tao Li, Tianli Feng
Summary: The experimental study investigated the formation of various pulses in a thulium-holmium co-doped nonlinear polarization rotation mode-locking fiber oscillator. The oscillator can operate in noise-like and soliton mode-locking regimes simultaneously, delivering different types of pulses by adjusting wave plates. This research achieved high-power output and demonstrated the generation of high-order harmonic soliton pulses and noise-like pulses with proper fiber cavity design.
Article
Optics
Ajanta Barh, B. Ozgur Alaydin, Jonas Heidrich, Marco Gaulke, Matthias Golling, Christopher R. Phillips, Ursula Keller
Summary: Femtosecond lasers with high repetition rates are attractive for spectroscopic applications. However, current laser sources at long wavelengths face limitations in output power and repetition rates. This study presents a high-power ultrafast laser oscillator operating at multi-GHz repetition rates using a specific laser modelocked with an SESAM. The results open up possibilities for efficient spectroscopy above 2 μm.
Article
Optics
Anna Suzuki, Sascha Kalusniak, Hiroki Tanaka, Mario Bruetzam, Steffen Ganschow, Masaki Tokurakawa, Christian Kraenkel
Summary: This study reports on the growth, temperature-dependent spectroscopy, and laser experiments of Tm3+-doped YScO3 mixed sesquioxide crystals. Laser quality Tm3+:YScO3 crystals with different doping levels were successfully grown, and the structural disorder in the mixed crystals allows for broad and smooth spectral features even at cryogenic temperatures. Continuous wave laser operation in the 2.1μm range was achieved using these crystals, demonstrating their potential for efficient ultrafast pulse generation.
Article
Materials Science, Multidisciplinary
Yangxiao Wang, Jingjing Liu, Xiaoyue Feng, Zhonghan Zhang, Yunfei Wang, Zhen Zhang, Fengkai Ma, Jie Liu, Liangbi Su
Summary: Ho,Pr:CaF2 single crystals were grown by modified temperature gradient technique method (TGT). A systematic study on the fluorescence characteristics around 2.9 µm has been carried out on this kind of materials for the first time, to the best of our knowledge. After co-doping with Pr3+, the population inversion is much easier to realize and the ratio of populations between the upper and lower energy levels is highest among the reported materials, which shows the Ho,Pr co-doped CaF2 is a kind of promising materials. The continuous-wavelength (CW) laser operation has been achieved with the maximum output power of 154 mW on 1%Ho,0.1%Pr:CaF2 crystals. It's the first report about the CW laser output on Ho-doped CaF2 single crystals.
Article
Optics
Chuanyong Ren, Weiwei Huang, Hangbin Xie, Fei Wang, Deyuan Shen, Jun Wang, Heyuan Zhu, Dingyuan Tang
Summary: This paper reports on the power scaling and efficient operation of a Ho:Y2O3 ceramic laser at 2.1 μm, which is in-band pumped using a high-power and narrow-linewidth Tm fiber source. The results demonstrate the superior power scaling capability and high efficiency of the Ho:Y2O3 ceramic laser in the 2.1 μm wavelength range.
Article
Optics
Yongguang Zhao, Li Wang, Weidong Chen, Pavel Loiko, Xavier Mateos, Xiaodong Xu, Ying Liu, Deyuan Shen, Zhengping Wang, Xinguang Xu, Uwe Griebner, Valentin Petrov
Summary: This study successfully generates ultrashort-pulse Hermite- and Laguerre-Gaussian laser modes with a pulse duration of around 100 fs from a compact solid-state laser in combination with a simple single-cylindrical-lens converter, pushing the advancement of such femtosecond structured laser sources into the 2-mu m spectral region. The negligible beam astigmatism, broad optical spectra, and almost chirp-free pulses highlight the high reliability of this laser source.
PHOTONICS RESEARCH
(2021)
Article
Optics
Yanqiu Du, Baoquan Yao, Tongyu Dai, Xiaojie Chen, ChunYu Shang
Summary: A Tm,Ho:YVO4 laser with compact geometry was demonstrated and analyzed in this study, achieving a slope efficiency of 30.5% for continuous wave operation and 19.3% for passively Q-switched mode with a Cr:ZnS saturable absorber. The pulse energy was consistent at around 130 μJ regardless of pump power, and the pulse repetition rate varied linearly from 2.9 kHz to 6.8 kHz as pump power increased. The Q-switch efficiency reached up to 58% at maximum pump power.
Article
Optics
Qi Li, Peng Zhang, Yunlong Fan, Yuzhu Ning, Jia Wei, Shoufeng Tong
Summary: In this study, a 1.55 μm amplified modulated optical signal was used as a homemade pump to generate a 1.7 μm gain-switched and mode-locked hybrid laser signal through the nonlinear polarization rotation effect. The experimental results demonstrated the generation of gain-switched pulse sequences with different repetition rates by the modulated pump, and the hybrid pulse train obtained by filtering and modulating the mode-locked pulse train with the shape of the gain-switched pulse.
Article
Materials Science, Multidisciplinary
Yuantao Zhao, Yang Li, Shengzhi Zhao, Tao Li, Ping Hu, Jiajia Mao, Kejian Yang, Tianli Feng
Summary: In this paper, a diode pumped passive Q-switching Tm, Ho:GAGG laser with a graphene saturable absorber mirror is reported. It achieved high power and stable pulse output.
Article
Optics
Adrian Alles, Venkatesan Jambunathan, Sami Slimi, Josep M. Serres, Magdalena Aguilo, Francesc Diaz, Xavier Mateos, Martin Smrz, Tomas Mocek
Summary: We investigate the laser properties of a 5 at.% Tm:YLF crystal at cryogenic temperatures, emitting at 2 μm using a modular setup. Continuous-wave laser operation was achieved by pumping the crystal with a Volume Bragg Grating-stabilized laser diode operating at 793 nm. A maximum output power of 6.5 W was obtained at 80 K, with a slope efficiency of 66.0% relative to the absorbed power, and excellent beam quality.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Optics
Daniel M. Maclure, Jonathan J. D. McKendry, Mohamed Sufyan Islim, Enyuan Xie, Cheng Chen, Xiaobin Sun, Xudong Liang, Xiaohui Huang, Hanaa Abumarshoud, Johannes Herrnsdorf, Erdan Gu, Harald Haas, Martin D. Dawson
Summary: A wavelength division multiplexing demonstration using deep ultraviolet micro light-emitting diodes achieved high-speed data transmission rates.
PHOTONICS RESEARCH
(2022)
Review
Engineering, Electrical & Electronic
D. Jevtics, B. Guilhabert, A. Hurtado, M. D. Dawson, M. J. Strain
Summary: This review highlights the main methods for transferring single nanowire devices from their growth substrate to a target chip, and discusses the compatibility of these methods with standard lithographic techniques and electronic contacting. The transfer of single nanowires enables the realization of a range of chip-scale optoelectronic devices.
PROGRESS IN QUANTUM ELECTRONICS
(2022)
Article
Crystallography
Konstantin N. Gorbachenya, Anatol S. Yasukevich, Viktor E. Kisel, Kirill Lopukhin, Vladimir V. Balashov, Alexander Fedin, Miron N. Gerke, Elena A. Volkova, Vasiliy O. Yapaskurt, Nikolay N. Kuzmin, Dmitry A. Ksenofontov, Dmitry Korost, Nikolay Kuleshov
Summary: This paper investigates the synthesis, spectral-luminescent properties, and energy level calculations of Er3+:Y2O3 optical ceramics. It also studies the composition and structure of the ceramics using various techniques.
Article
Instruments & Instrumentation
K. N. Gorbachenya, A. S. Yasukevich, N. A. Tolstik, V. E. Kisel, A. A. Tarachenko, V. Homan, L. K. Pavlovskiy, V. A. Orlovich, E. A. Volkova, V. O. Yapaskurt, N. Kuleshov
Summary: This article reports the investigation results of the spectroscopic properties of Er3+, Yb3+:YGdSiO5 (YGSO) crystals. The measured spectra include polarized absorption and luminescence spectra, and the lifetimes of energy levels were determined. The stimulated emission and gain cross-section spectra for Er3+ ions in YGSO were also calculated.
DEVICES AND METHODS OF MEASUREMENTS
(2022)
Article
Instruments & Instrumentation
V. E. Kisel
Summary: This article presents the latest results of Tm:KYW laser performance with a polycrystalline Cr:ZnSe as the saturable absorber for 2 mu m spectral region. The experiments show that Tm:KYW crystals have promising applications in surgery and rangefinding, and can be used to investigate the damage threshold of saturable absorbers and nonlinear crystals near 2 mu m wavelength.
DEVICES AND METHODS OF MEASUREMENTS
(2022)
Article
Optics
Navid Bani Hassan, Fahimeh Dehkhoda, Enyuan Xie, Johannes Herrnsdorf, Michael J. Strain, Robert Henderson, Martin D. Dawson
Summary: Researchers have developed a chip-scale projector system based on micro-LED pixels, capable of high frame rate projection of binary patterns, with gray-scale resolution and pulse mode capability.
PHOTONICS RESEARCH
(2022)
Article
Optics
Natan Monvoisin, Elizabeth Hemsley, Lucas Laplanche, Guilhem Almuneau, Stephane Calvez, Antoine Monmayrant
Summary: This paper reports on a hyperspectral imaging microscopy system that uses spectrally-shaped illumination to enhance in-situ inspection of the lateral III-V-semiconductor oxidation (AlOx) process in Vertical-Cavity Surface-Emitting Laser (VCSEL) manufacturing. The implemented illumination source, based on a digital micromirror device (DMD), allows for arbitrarily tailoring the emission spectrum to detect minute surface reflectance contrasts on VCSEL or AlOx-based photonic structures. This technique offers improved inspection of oxide aperture shapes and dimensions with high optical resolution and can be extended to real-time monitoring of oxidation or other semiconductor processes.
Article
Biochemical Research Methods
Natalie Bruce, Francesca Farrell, Enyuan Xie, Mark G. Scullion, Anne-Marie Haughey, Erdan Gu, Martin D. Dawson, Nicolas Laurand
Summary: A fluorescence sensor capable of spatially multiplexed measurements using smartphone detection is introduced. Bioconjugated quantum dots are employed as the fluorescent label and excited by a blue-emitting microLED. The one-dimensional GaN microLED array is butt-coupled to one edge of a glass slide to utilize total internal reflection fluorescence (TIRF) principles. Bioassays on the glass waveguide's top surface are excited, and the resulting fluorescence is detected using a smartphone. The red, green, and blue channels of the digital image are used to spectrally separate the excitation light from the fluorescence for analysis. Proof-of-principle experiments using a biotin-functionalized glass slide demonstrate the detection of streptavidin conjugated quantum dots down to a concentration of 8 nM.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Optics
Graeme E. Johnstone, Johannes Herrnsdorf, Martin D. Dawson, Michael J. Strain
Summary: Challenging imaging applications that require ultra-short exposure times or imaging in photon-starved environments often have extremely low numbers of photons per pixel (<1 photon per pixel). To improve the image quality in such photon-sparse images, post-processing techniques, such as Bayesian retrodiction and bilateral filtering, can be used to estimate the number of photons detected and improve the spatial distributions in single-photon imaging applications. In this study, we demonstrate that at high frame rates (>1 MHz) and low incident photon flux (<1 photon per pixel), image post-processing techniques can provide better grayscale information and spatial fidelity of reconstructed images compared to simple frame averaging, with up to a 3-fold improvement in SSIM.
Article
Chemistry, Physical
Lijun Zhang, Karl Ridier, Oleksandr Ye. Horniichuk, Steïphane Calvez, Lionel Salmon, Gaïbor Molnar, Azzedine Bousseksou
Summary: The formation of hybrid light-matter states, which allows control of quantum-mechanical states and manipulation of molecular materials, has been observed in switchable strong light-matter coupling involving bistable spin-crossover molecules. The thermally induced switching between low-spin and high-spin states of these molecules enables fine control of the light-matter hybridization strength, offering the possibility of reversible switching between ultrastrong- and weak-coupling regimes within a single photonic structure. This work demonstrates the potential of spin-crossover molecular compounds in the development of tunable polaritonic devices and polaritonic chemistry.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Eleni Margariti, Gemma Quinn, Dimitars Jevtics, Benoit Guilhabert, Martin D. Dawson, Michael J. Strain
Summary: A continuous, single shot roller transfer printing process is introduced for large-scale hybrid integration of semiconductor devices. It demonstrates transfer of a 320 x 240 pixel micro-LED array, with sub-micron relative position accuracy, representing over 75,000 individual devices in one shot. The transfer printing process maintains array geometry, with pixel spatial location error less than 1 & mu;m deviation from the as-designed layout. An automated sub-micron precision metrology system using simple optical microscopy is developed to assess device populations and yield.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Benoit Guilhabert, Sean P. Bommer, Nils K. Wessling, Dimitars Jevtics, Jack A. Smith, Zhongyi Xia, Saptarsi Ghosh, Menno Kappers, Ian M. Watson, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Transfer printing technology has been widely used for integrating planar membrane devices on photonic and electronic circuits. This work introduces an advanced transfer print system that allows printing of optical devices in non-planar geometries and enables in-situ optical monitoring. The system demonstrates the printing of micro-resonators coupled to on-chip waveguides, inverted device printing, and the assembly of micro-cavities with semiconductor micro-lenses and nanowire lasers. Non-standard substrates such as optical chip facets and single-mode fibre ends are also successfully printed. The in-situ optical coupling through the transfer printing system enables real-time active alignment of the printed devices.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jonathan J. D. McKendry, Enyuan Xie, Jordan Hill, Hichem Zimi, Johannes Herrnsdorf, Erdan Gu, Robert K. Henderson, Martin D. Dawson
Summary: This article reports a deep ultraviolet AlGaN micro-LED array driven by electronic drivers implemented in CMOS technology. The integrated device allows independent control of each micro-LED and has potential applications in various fields.
IEEE PHOTONICS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Jordan Hill, Cheng Chen, Enyuan Xie, Jonathan J. D. Mckendry, Johannes Herrnsdorf, Erdan Gu, Harald Haas, Martin D. Dawson
Summary: We systematically investigate the performance of UV-C LEDs for optical wireless communication, focusing on the device size dependence. Smaller devices exhibit lower optical power but faster modulation speed. The study finds that a 60 μm diameter LED transmitter achieves the highest average SNR and SE, with a data transmission rate of up to 5.53 Gbps.
IEEE PHOTONICS JOURNAL
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Jack A. Smith, Zhibo Li, Saprtarsi Ghosh, Henry Francis, Gabriele Navickaite, Loyd J. McKnight, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Silicon nitride (Si3N4) is a high-performance material platform for visible wavelength photonic integrated circuits, especially for heterogeneous/hybrid integration of complementary materials. This work characterizes the performance of Si3N4 from LIGENTEC as a base for hybrid integration.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
