Article
Optics
Yujie Xiong, Shixiang Wang, Zhixiang Chen, Xiaoli Sun, Hongliang Liu, Yuechen Jia, Feng Chen
Summary: Waveguide lasers with compact packages have gained significant interest in recent years due to the development of integrated photonics and demand for miniaturized photonic devices. This study utilizes femtosecond laser direct writing (FsLDW) technology to fabricate cladding waveguides in Tm:YLF crystal. A low-threshold waveguide laser at 1877 nm is achieved using a Ti:sapphire laser pump at 779 nm. In addition, a pulsed Q-switched Tm:YLF waveguide laser is demonstrated by employing a Bi2Se3-based saturable absorber (SA) element. The experimental results highlight the potential of Tm:YLF and FsLDW in constructing compact mid-infrared lasers.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Ruixuan Yi, Xutao Zhang, Fanlu Zhang, Linpeng Gu, Qiao Zhang, Liang Fang, Jianlin Zhao, Lan Fu, Hark Hoe Tan, Chennupati Jagadish, Xuetao Gan
Summary: This article reports a simple and facile integration strategy of a laser source in passive photonic integrated circuits using semiconductor nanowires embedded in waveguides. The method is applicable to other PIC platforms and promises CMOS compatibility.
Article
Engineering, Electrical & Electronic
Pawel Strzebonski, Kent Choquette
Summary: In this study, we analyzed the supermodes of 2-element photonic crystal vertical cavity surface emitting laser arrays using 2-dimensional complex refractive index waveguide modeling. The complex modal effective indices were then used to calculate the complex coupling coefficient between the laser array elements. We provided an analysis of the effects of array design parameters and presented example designs for 850 nm arrays.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Zhongliang Qiao, Xiang Li, Jia XuBrian Sia, WanJun Wang, Hong Wang, Lin Li, Zaijin Li, Zhibin Zhao, Guojun Liu, Hao Chen, Yi Qu, Xin Gao, Baoxue Bo, Chongyang Liu
Summary: This study utilizes double quantum wells passively mode locked lasers to achieve subpicosecond pulse generation, finding that operational parameters have significant effects on the mode-locking characteristics of the laser, especially temperature causing an increase in pulse width. This has important implications for improving the performance of the laser.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Philipp Taeschler, Andres Forrer, Mathieu Bertrand, Filippos Kapsalidis, Mattias Beck, Jerome Faist
Summary: In recent years, there has been significant interest in optical frequency combs with frequency modulated output. This study demonstrates an asynchronous optical sampling technique that operates directly in the time domain. By using a mid-infrared quantum cascade laser frequency comb, they were able to measure both the instantaneous intensity and optical frequency of the comb. The results show a quasi-constant intensity output and a close to linear frequency chirp, consistent with phase-resolved spectral measurements. In contrast to previous works, stable phase-locking is achieved with positive intracavity dispersion, leading to an inversion of the observed frequency modulation.
LASER & PHOTONICS REVIEWS
(2023)
Review
Optics
Zhiyun Ye, Molin Su, Jianing Li, Cainian Jing, Shubo Xu, Liqiang Liu, Guocheng Ren, Xiaolin Wang
Summary: This review discusses the main factors of the formation mechanism of laser fabricated nano-materials, focusing on precision microstructures, mechanical properties, biocompatibility, and research status. It also discusses the trend of development of laser nano-technology and how to utilize the nano-materials to expand the applications of light alloys.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Tsan-Wen Lu, Jing-Ting Wang, Yu-Cheng Lin, Po-Tsung Lee
Summary: We propose and study the hybrid integration of a 1D photonic crystal nanobeam (NB) laser on a SiNx waveguide, which can achieve over 50% directional coupling to the specific waveguide output facet while maintaining a sufficient quality factor for low-threshold lasing. Using the transfer printing technique, we successfully demonstrated the proposed hybrid integration with optimized parameters, showing significant planar laser emission from the SiNx waveguide facet in experiments with a low lasing threshold of 180 mu W. This hybrid integration with compact size, unidirectional coupling, and low lasing threshold can provide a helpful reference for designing PhC NB lasers coupled with SiNx waveguides in silicon-based photonic integrated circuits.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Sara Pizzurro, Shu Jun, Mauro Tonelli, Luca Carra, Giuliano Piccinno, Antonio Agnesi, Federico Pirzio
Summary: The Yb-doped LiLuF4 single-crystal fiber grown by the micro-pulling-down method was tested in a high-power pumped amplifier setup. The results demonstrate the high optical quality and promising performance of this new material technology at very high pump power.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Qinwen Duan, Lingling Yang, Yuan He, Longlong Chen, Jie Li, Lili Miao, Chujun Zhao
Summary: The stable Q-switched Er-doped fluoride fiber laser was demonstrated with the few-layered Ta2NiS5 in the mid-infrared spectral range, showing great potential for broadband optoelectronic devices. Ta2NiS5 exhibited saturable absorption behavior and could deliver stable Q-switched pulses with specific parameters, paving the way for its application as a saturable absorber in mid-infrared regions.
IEEE PHOTONICS JOURNAL
(2021)
Article
Multidisciplinary Sciences
Ang Li, Yeshaiahu Fainman
Summary: In this study, an ultra-compact single-shot spectrometer on silicon platform is presented for sparse spectrum reconstruction. It consists of 32 stratified waveguide filters with diverse transmission spectra for sampling the unknown spectrum of the input signal. The fabricated spectrometer demonstrates broad operating bandwidth and narrowband peaks that can be clearly resolved. Compact spectrometers with simple design can enable various applications in optical spectral bands.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Zhengda Sun, Feifei Wang, Haiping Xia, Hongkun Nie, Kejian Yang, Ruihua Wang, Jingliang He, Baitao Zhang
Summary: This study investigated the absorption and fluorescence spectra of Er3+ and Pr3+ co-doped LiYF4 crystals, showing that Pr3+ co-doping effectively enhances the mid-infrared transition of Er3+. Using Judd-Ofelt theory, the stimulated emission cross section was calculated and a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was successfully realized for the first time. This laser showed promising potential for 2.7 μm laser generation.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
YongLing Hui, Qi Liu, Xing Hu, Zhanda Zhu, Hong Lei, Qiang Li
Summary: High efficient pulse output was achieved experimentally from a large size rectangular core crystalline waveguide actively Q-switched laser. The design using a continuous diode laser as an end pump resulted in high output pulse energy, optical-optical efficiency, and good beam quality, which can be applied for various types of crystalline waveguide lasers.
Article
Optics
Sara Pizzurro, Federico Pirzio, Shu Jun, Alberto Di Lieto, Giuliano Piccinno, Mauro Tonelli, Antonio Agnesi
Summary: This study demonstrates a solid-state laser oscillator based on a Yb-doped birefringent single crystal fiber, achieving high output power and good beam quality. By optimizing the resonator layout, researchers obtained a maximum output power of 10.4 W in a simple resonator and up to 25 W in an improved resonator configuration. The thermal lensing effect, laser intrinsic slope efficiency, and losses were characterized in both resonator setups.
OPTICS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
He Pan, Wen-Hui Shi, Zi-Xuan Zhang, Liao-Lin Zhang, Chun-Xiao Liu
Summary: The three spectroscopic parameters of Dy:LPS were calculated using the Judd-Ofelt theory, and a planar waveguide was fabricated on Dy:LPS by proton implantation. The dark-mode spectrum was obtained using the prism coupling method, and the refractive index profile of the waveguide structure was reconstructed using RCM. The mode profile of the waveguide was investigated using the end-face coupling technique. The study suggests that Dy:LPS crystal and its waveguide structure have potential applications in integrated optics, especially in the fabrication of solid-state waveguide lasers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Applied
Fangyuan Liu, Tuyu Yin, Yu Liu, Iqbal Naeem, Dan Guo, Libin Cui, Tianrui Zhai
Summary: In this work, multiple-beam colloidal quantum dot lasers are achieved in a double waveguide-grating (W-G-W) microcavity using interference lithography. The low-threshold multiple-beam laser output with emission peaks at 664.6 and 645.2 nm is realized under optical pumping. The presence of quasi-propagation modes provides a method for designing compact laser sources.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Stefan Pueschel, Sascha Kalusniak, Christian Kraenkel, Hiroki Tanaka
Summary: By revisiting the spectroscopic characterization of ytterbium-doped LiYF4 (Yb:YLF), it was found that the emission cross sections and radiative lifetimes are temperature-dependent, which can be used for laser cooling application design. Fit equations for important transition peak values as a function of temperature were provided, while the necessary crystal purity for achieving laser cooling was also emphasized based on the spectroscopic data.
Article
Optics
Sascha Kalusniak, Elena Castellano-Hernandez, Hasan Yalcinoglu, Hiroki Tanaka, Christian Kraenkel
Summary: This paper reviews the latest developments in Tb3+-based solid-state lasers, summarizes the spectroscopic properties, and provides valuable guidelines and recommendations for improving performance through the choice of host materials.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Optics
R. Moncorge, Y. Guyot, C. Kraenkel, K. Lebbou, A. Yoshikawa
Summary: The study focused on the absorption and emission properties of Tm3+-doped sesquioxides Y2O3, Lu2O3, and Sc2O3 at different wavelengths. It was discovered that only 75% of the Tm3+ ions were involved in the absorption and emission spectra, leading to calculations of cross sections for important excited-state transitions.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Ji Eun Bae, Thomas Calmano, Christian Kraenkel, Fabian Rotermund
Summary: This study demonstrates the dynamic single- and dual-channel graphene Q-switching of a Yb:YAG waveguide by controlling the power-splitting ratio, enabling the selective excitation of individual channels and controlled splitting ratios of output powers. The beam-splitter-type waveguide laser developed in this study has potential advantages in various applications such as optical communication, metrology, and sensing.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Stefan Pueschel, Felix Mauerhoff, Christian Kraenkel, Hiroki Tanaka
Summary: This article reports the first example, to the best of our knowledge, of solid-state laser cooling in ytterbium-doped CaF2 and SrF2 crystals by anti-Stokes fluorescence. The crystals were grown in a fluorine-rich atmosphere using the Czochralski method to prevent the formation of divalent ytterbium ions. Experimental results and model calculations using temperature-dependent spectroscopic data suggest that these crystals have cooling efficiencies higher than 3% at room temperature and can be cooled to temperatures as low as 150 K when excited at around 1030 nm.
Review
Materials Science, Multidisciplinary
Christian Kraenkel, Anastasia Uvarova, Christo Guguschev, Sascha Kalusniak, Lena Huelshoff, Hiroki Tanaka, Detlef Klimm
Summary: Mixed sesquioxides are excellent host materials for rare-earth doped laser gain media, with reduced melting temperatures for easier fabrication and high optical quality. Due to their inhomogeneously broadened gain spectra caused by intrinsic disorder, mixed sesquioxides show great potential for the generation and amplification of ultrashort pulses.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Physics, Applied
Moritz Badtke, Hiroki Tanaka, Sascha Kalusniak, Maxim Demesh, Nikolay Kuleshov, Christian Kraenkel
Summary: We present a study on the generation of few-ns pulses in the red and orange spectral range using a passively Q-switched Pr3+:YLF laser. By optimizing the resonator design and the initial transmission of the Co:MgAl2O4 saturable absorber, peak powers exceeding 1.1 kW were achieved at wavelengths of 640 nm and 607 nm, with pulse durations of 2.4 ns and 5.3 ns, respectively. These are the shortest pulse durations among any Q-switched Pr3+ lasers, making this system a potential candidate for efficient frequency doubling into the ultraviolet range.
APPLIED PHYSICS EXPRESS
(2022)
Review
Engineering, Electrical & Electronic
Hiroki Tanaka, Sascha Kalusniak, Moritz Badtke, Maxim Demesh, Nikolai Kuleshov, Fumihiko Kannari, Christian Krankel
Summary: This article reviews the current state of continuous wave and pulsed visible solid-state lasers and amplifiers based on Pr3+ and Tb3+ as the active ion. It discusses the spectroscopic properties of these ions, suitable host materials, and the prospects for power scaling. Visible solid-state lasers have wide-ranging applications, but they are still in an early stage of development.
PROGRESS IN QUANTUM ELECTRONICS
(2022)
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
Optics
Stefan Pueschel, Felix Mauerhoff, Christian Kraenkel, Hiroki Tanaka
Summary: This study compares the cooling performance of Yb3+-doped LiYF4 crystals with Yb:KYF crystals grown in our institute using laser cooling by anti-Stokes fluorescence. Yb:KYF exhibits better cooling performance at temperatures below 200K. Further improvement is possible for Yb:KYF crystals through optimizing the growth process and using purer raw materials.
Article
Optics
Moritz Badtke, Sascha Kalusniak, Hiroki Tanaka, Christian Kraenkel
Summary: We investigated the dependence of visible laser performance of Tb3+:LiLuF3 on the ultraviolet pumping wavelength and presented the first UV-laser-diode-pumped Tb3+-based laser. We found that thermal effects occur at moderate pump power for UV pump wavelengths with strong excited-state absorption, but disappear for wavelengths with weak absorption. Pumping with a UV laser diode emitting at 378.5 nm enables continuous wave laser operation in a 3mm short Tb3+(28 at.%):LLF crystal, achieving slope efficiencies of 36% at 542/544 nm and 17% at 587 nm, with a minimum laser threshold as low as 4 mW.
Proceedings Paper
Engineering, Electrical & Electronic
Anna Suzuki, Christian Kraenkel, Masaki Tokurakawa
Summary: This paper presents a combined gain media Kerr-lens mode-locked laser based on Tm-doped sesquioxide materials, achieving pulses as short as 60 fs with an average output power of 52 mW at 2.1um.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Stefan Pueschel, Sascha Kalusniak, Christian Krankel, Hiroki Tanaka
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Anna Suzuki, Christian Kraenkel, Masaki Tokurakawa
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Anastasia Uvarova, Sascha Kalusniak, Christo Guguschev, Christian Kraenkel
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Materials Science, Multidisciplinary
Yanbin Wang, Xinyou Huang, Ziqiu Cheng, Penghui Chen, Yuyang Chen, Junhao Ye, Haohong Chen, Zhenzhen Zhou, Denis Yu Kosyanov, Jiang Li
Summary: Uniform Al2O3-Ce:LuAG composite phosphor ceramics (CPCs) with excellent luminescent properties and thermal stability have been successfully synthesized in this study, showing great potential for application in solid-state laser lighting.
Article
Materials Science, Multidisciplinary
Syed Muhammad Ali Zaidi, Mazhar Ali Kalyar, Zulfiqar Ali Raza, Aayesha Shoukat, Rubaila Waseem, Muhammad Aslam
Summary: Polyvinyl alcohol (PVA) nanocomposite strips embedded with graphene nanosheets and copper-ferrite nanoparticles were synthesized using solution casting technique. Laser pulse irradiations were then applied to modify the structural, optical, and electrical properties of the strips, showing potential for optoelectronic devices.
Article
Materials Science, Multidisciplinary
Yunru Chen, Jialing Wu, Jiajia Wang, Shihui Ma, Hongwei Yu
Summary: This paper investigates the angular non-critical phase-matching second-harmonic-generation properties of Ba3(ZnB5O10)PO4 crystal and explores its potential applications in the output spectral regions.
Article
Materials Science, Multidisciplinary
Qun Jing, Menglin Zhu, Lu Li, Xu Ji, Haiming Duan, Henglei Chen, Ming-Hsien Lee
Summary: The paper introduces two new nonlinear optical materials, MZnPO4 (M = Rb, Cs), synthesized by cation substitution. These materials exhibit a honeycomb-like structure and show mild SHG responses with short absorption edges. The thermal properties, IR spectra, and theoretical calculations of the materials are also discussed.
Article
Materials Science, Multidisciplinary
Camila Ianhez-Pereira, Akhil Kuriakose, Ariano De Giovanni Rodrigues, Ana Luiza Costa Silva, Ottavia Jedrkiewicz, Monica Bollani, Marcio Peron Franco de Godoy
Summary: This study aims to evaluate the crystalline changes induced by ultrafast laser micromachining on manganese oxide thin films using micro-Raman spectroscopy. The results show that laser-writing is effective in locally modifying low-crystallinity films and increasing crystallite sizes, highlighting an interesting approach to evaluate laser-induced structural modifications on metal oxide thin films.
Article
Materials Science, Multidisciplinary
Kamal Bansal, Neeraj Kumar Mishra, Ibrahim Abdullahi, Param Jeet Singh, Mohit Tyagi, Sukhpal Singh
Summary: A novel Sm3+ activated oxyfluoride glass was synthesized and its structure and properties were analyzed. The glass showed potential applications in lasers, optical temperature sensing, and high-energy scintillators.
Article
Materials Science, Multidisciplinary
Xingjian Wang, Zhixu Wu, Jiawei Zhu, Yubin Kang, Mengqiang Cai, Yong Xia, Hui Deng
Summary: Antimony sulfide (Sb2S3) has been investigated as a promising material for visible light photodetectors due to its non-toxicity, stability, and high absorption coefficient. In this study, we systematically explored the impact of key parameters on the performance of Sb2S3 devices using simulation and successfully fabricated self-powered photodetectors with high responsivity and specific detectivity. Furthermore, we demonstrated the application of the Sb2S3 detector in a scanning imaging system, showcasing its potential for developing new types of visible light detectors and imaging systems.
Article
Materials Science, Multidisciplinary
O. I. Sallam, R. M. Ahmed
Summary: The 20NaF-60P2O5-20Na2O fluorophosphate glass systems doped with 3 wt% of CoO and NiO were investigated for their optical parameters before and after gamma irradiation. The presence of defects within the glass network and the addition of transition metals were found to affect the properties of the composites. After irradiation, a red shift was observed in the dissipation factor spectrum. The energy lost at the surface of the composites was larger than the energy lost within the constituent materials. All investigated composites showed insulating behavior and exhibited increased nonlinear optical parameters after irradiation, with the CoO-doped composite showing the highest values.
Article
Materials Science, Multidisciplinary
Fahimeh Ahmadi, Zeinab Ebrahimpour, Asghar Asgari, Bao Van
Summary: In this study, Er3+-doped sulfophosphate glasses containing titanium nanoparticles (TiO2 NPs) and different concentrations of silver nanoparticles (AgNPs) were synthesized. The impact of AgNPs on the physical and structural characteristics, optical absorption and emission features, and photocatalytic activity of the glasses were investigated. The results showed that the addition of AgNPs enhanced the emission intensity of the glasses, with the system containing 0.04 mol% of AgNPs exhibiting optimal performance. Furthermore, the presence of AgNPs and TiO2 NPs in the glass matrix positively affected the photocatalytic performance.
Article
Materials Science, Multidisciplinary
Zhuang Li, Rongfei Huang, Wei Yuan, Shaoqiang Zheng, Wenlu Liao, Huiying Xu, Zhiping Cai
Summary: This study reports the first realization of an 868 nm Pr:YLF laser pumped by an InGaN blue laser diode. The laser achieved a maximum power of 641 mW with stable output and good beam quality. The experimental results were in agreement with theoretical simulations.
Article
Materials Science, Multidisciplinary
Bhishma Karki, Youssef Trabelsi, Amrindra Pal, Sofyan A. Taya, Ram Bharos Yadav
Summary: This study proposes an SF11 Prism- Ag- ZnO nanowires-CeO2-Sensing layer-based surface plasmon resonance sensor for measuring dopamine concentration in human blood. The sensor demonstrates high sensitivity and detection accuracy, and holds significant importance for early diagnosis of neurological diseases.
Article
Materials Science, Multidisciplinary
M. Taoufiq, A. Soussi, A. Elfanaoui, A. Ait Hssi, S. Baoubih, A. Ihlal, K. Bouabid
Summary: In this study, the effect of copper doping within ZnS on glass substrates was investigated through experimental and theoretical approaches. Pure ZnS and Cu-doped ZnS films with varying copper concentrations were deposited on glass substrates using the SILAR technique. The structural, morphological, and optical properties of the films were characterized, and the theoretical FP-LAPW method based on density functional theory was employed to study the properties of copper-doped ZnS.