Article
Optics
Kenta Takahashi, Natsuho Nashimoto, Ayaka Koganei, Hiroya Katsuragawa, Yasushi Fujimoto, Osamu Ishii, Masaaki Yamazaki
Summary: We demonstrated a primary yellow fiber laser using Dy3+-doped waterproof fluoro-aluminate glass (Dy3+:WPFG) in the fiber core, excited by a blue LD at 450 nm. The Dy3+:WPFG fiber laser achieved a maximum output power of 23.8 mW with a slope efficiency of 40.5%. The key technology is a newly developed single-mode, double-clad-structured fiber made from Dy3+:WPFG, and the V-number was evaluated to be 2.36 (< 2.405 single-mode condition). This yellow fiber laser can be applied to medical treatment, laser processing, and display technology with further power enhancement.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Jinhai Zou, Tianran Li, Yanbo Dou, Jin Li, Nan Chen, Yikun Bu, Zhengqian Luo
Summary: The research team successfully demonstrated watt-level high-power yellow laser generation using Dy3+-doped ZBLAN fiber. They found that the reflectivity of the output coupler and the length of the gain fiber have significant impacts on the performance of the yellow laser, achieving a maximum efficiency of 33.6% and a maximum output power of 1.12 W. The study shows the potential of yellow Dy3+-doped ZBLAN fiber lasers in ophthalmology, astronomical exploration, and high-resolution spectroscopy applications.
PHOTONICS RESEARCH
(2021)
Article
Optics
Bo Xiao, Chenyao Shen, Shuaihao Ji, Zhongyu Wang, Zhengdong Dai, Weihang Cao, Yuchen Xue, Huiying Xu, Zhiping Cai
Summary: In this study, a fiber laser operating at 1015 nm was realized for the first time, confirming a new mechanism where 1D2 can be the upper energy level. The broad emission spectra of Pr3+-doped fibers were also utilized as new spectral sources.
Article
Chemistry, Multidisciplinary
Shoujun Ding, Chuancheng Zhang, Hao Ren, Miaomiao Wang, Xianshan Huang, Yong Zou, Xubing Tang, Wenpeng Liu, Qingli Zhang
Summary: In this study, two compositions of mixed garnet crystals doped with Dy-3+ and Tb3+ ions were successfully grown using the Czochralski method. The structures, thermal properties, absorption properties, and emission characteristics of the crystals were thoroughly examined, and a mechanism for energy transfer between Dy3+ and Tb3+ ions was elucidated. The results indicate that these mixed garnet crystals have potential applications in all solid-state yellow laser technology.
Article
Optics
Wei Yuan, Run Fang, Huiying Xu, Zhiping Cai
Summary: We demonstrated a near-infrared laser at 1195.8 nm in a Ho3+ (0.5 at. %):YLF crystal for the first time, with the upper energy level of 5I6, and a 640 nm red laser was used as pump source. A maximum output power of 201 mW, with a slope efficiency of 8.9%, was achieved at the absorbed pump power of 3.16 W in the c polarization. The fluctuations of output power were within 8%, the FWHM of spectrum was approximately 0.75 nm, and the beam quality M2x and M2y factors were measured to be 1.51 and 1.68, respectively.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
D. C. Silva, A. S. Lima, J. H. L. Silva, M. V. S. Rezende, D. Sampaio, J. Ballato, R. S. Silva
Summary: This study investigated the effect of Dy concentration on the persistent luminescence properties of Eu doped barium aluminate laser-sintered ceramics. It was found that samples with higher Dy concentration exhibited a Dy-rich phase at the grain boundary, and there was a clear dependence of persistent luminescence intensity and decay time on Dy concentration.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Shoujun Ding, Hongyuan Li, Hao Ren, Ye Tong, Wenpeng Liu, Qingli Zhang
Summary: This study successfully synthesized a high-quality Dy:GSAG crystal with excellent optical properties, making it a potential candidate for an all-solid-state yellow laser at 582 nm. The crystal exhibited ultra-broad absorption and emission bands, high absorption and emission cross-sections, and a fluorescence quantum efficiency much higher than that of Dy:YAG crystals. Additionally, evident yellow and white light emissions were observed directly in the crystal under specific laser excitations.
Article
Optics
Shoujun Ding, Hongyuan Li, Qingli Zhang, Wenpeng Liu
Summary: With the successful growth of high-quality Dy:YAG and Dy,Tb:YAG crystals using the Czochralski method, their potential as competitors for all solid state yellow lasers is highlighted. Co-doping Tb3+ into Dy:YAG crystal improves its emission crosssection, while the high thermal conductivity of Dy:YAG suggests its suitability for high-power laser operation. Both Dy:YAG and Dy,Tb:YAG show promise in accelerating the population depletion on the lower laser level of Dy3+, making them excellent candidates for yellow laser applications.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Yuxia Zhang, Rong Wang, Youshi Zhou, Shuxuan Cao, Dazhi Lu, Honghao Xu, Wenjuan Han, Junhai Liu
Summary: This study reports on the development of a continuous-wave yellow laser using Dy3+, Tb3+:LuLiF4 crystal, with a maximum output power of 220 mW. By using a single-emitter blue laser diode as the pump source, a passively Q-switched yellow laser is generated using Cr:YAG as the saturable absorber, achieving a pulse width of less than 582 ns, a repetition rate of 5.8 kHz, and a pulse energy and peak power of 4.5 μJ and 7.7 W, respectively.
OPTICS COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Sk Mahamuda, Farooq Syed, Ch B. Annapurna Devi, K. Swapna, M. V. V. K. S. Prasad, M. Venkateswarlu, A. S. Rao
Summary: Dy3+ ions doped phosphate glasses were prepared and characterized using various spectroscopic techniques, revealing intense emission bands in blue and yellow regions under 387 nm excitation. Concentration quenching was observed for phosphate glass with 1 mol% of Dy3+ ions, indicating potential dipole-dipole interactions between Dy3+ ions. The spectroscopic features were also used to evaluate the suitability of the glasses for yellow laser applications through stimulated emission cross-sections, branching ratios, quantum efficiencies, and CIE-color coordinates.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Crystallography
Chao Niu, Yan Jiang, Ya Wen, Lu Zhao, Xinyu Chen, Chunting Wu, Tongyu Dai
Summary: In this study, a Tm:YAP laser with an output wavelength of 1989 nm was utilized as the pump source for a Q-switched Ho:YAP laser, resulting in a high power and high efficiency pulse laser output. The obtained Ho:YAP laser had an average power of 18.02 W with a pulse width of 104.2 ns at a repetition frequency of 10 kHz, with a slope efficiency of 70.11% and an optical-optical conversion efficiency of 43.03%.
Article
Optics
Xiuji Lin, Qichen Feng, Yao Zhu, Shuaihao Ji, Bo Xiao, Huiying Xu, Wensong Li, Zhiping Cai
Summary: A novel wavelength-switchable visible continuous-wave Pr3+：YLF laser was developed, achieving high output powers and slope efficiencies, including dual-wavelength and triple-wavelength laser operations, as well as the demonstration of first-order vortex lasers.
OPTO-ELECTRONIC ADVANCES
(2021)
Article
Optics
M. Z. Amin, S. D. Jackson, M. R. Majewski
Summary: In this study, the F-4(9/2) to H-6(13/2) lasing transition of dysprosium (Dy3+)-doped ZBLAN fiber for yellow laser emission was experimentally and theoretically analyzed. The experimental results showed a lower slope efficiency than the Stokes limit, which was attributed to background loss of the fiber and excited-state absorption of the yellow light. A numerical model was developed to understand and analyze the potential improvements of the fiber laser system, with suggestions for reducing ESA in future Dy3+-doped yellow laser systems through cascade lasing or co-doping with suitable rare earth ion desensitizer.
Article
Crystallography
Xiaoting Chen, Yisheng Huang, Feifei Yuan, Lizhen Zhang, Zhoubin Lin
Summary: A Dy:CNGS crystal with excellent optical properties was successfully synthesized in this study, showing potential as a solid-state yellow laser material. The crystal exhibited relatively high absorption and emission cross-sections, making it suitable for commercial InGaN laser diode pumping after spectral analysis and Judd-Ofelt theory calculations.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Optics
Run Fang, Zhiping Cai, Huiying Xu
Summary: The first report of a CW laser with a wavelength of 729nm in a Pr3+:YLF crystal is presented. By utilizing an InGaN laser diode for tuning, a wide tuning range is achieved, and a high-power output at 729.46nm is demonstrated. The output power fluctuation is stable, and the beam quality is good at this wavelength.
Article
Ophthalmology
Tetsuya Ogawa, Kinga Yo, Hiroki Okamoto, Daisuke Inukai, Syunpei Yamanaka, Rui Sano, Yasushi Fujimoto, Makoto Ito, Yukihiko Oshima, Toyonori Tsuzuki, Ryuzo Ueda, Yasuhiro Takahashi, Hirohiko Kakizaki
Summary: This study illustrates the efficacy of chemotherapy and chemoradiotherapy in treating advanced HPV-related lacrimal sac squamous cell carcinoma, avoiding radical surgery. Molecular biological indicators, such as p16 and RNA status, were used for diagnosis and treatment decision-making. The approach of neoadjuvant chemotherapy followed by definitive chemoradiotherapy provides a promising alternative for advanced cases of p16-positive lacrimal sac carcinoma.
SEMINARS IN OPHTHALMOLOGY
(2022)
Article
Otorhinolaryngology
Naoki Nishio, Yuriko Okazaki, Akihisa Wada, Hidenori Tsuzuki, Miki Kambe, Yasushi Fujimoto, Michihiko Sone
Summary: Bilateral squamous cell carcinoma of the external auditory canal is extremely rare. This case report describes a 74-year-old patient with bilateral locally advanced SCC of the EAC, the management and treatment history. The patient underwent surgery and proton therapy but unfortunately died due to disease recurrence. Clinicians should be aware of the possibility of bilateral SCC of the EAC and carefully manage each ear during follow-up.
ACTA OTO-LARYNGOLOGICA CASE REPORTS
(2022)
Article
Otorhinolaryngology
Sayaka Yokoi, Naoki Nishio, Takashi Maruo, Mariko Hiramatsu, Nobuaki Mukoyama, Hidenori Tsuzuki, Akihisa Wada, Naoki Atsuta, Daisuke Ito, Takashi Tsuboi, Gen Sobue, Masahisa Katsuno, Yasushi Fujimoto, Michihiko Sone
Summary: This study retrospectively analyzed the clinical and surgical data of 26 patients with ALS who underwent laryngeal closure surgery. The results showed that laryngeal closure surgery can safely maintain swallowing function and reduce the risk of chronic aspiration in patients with ALS.
Article
Ophthalmology
Kinga Yo, Kunihiro Nishimura, Yasuhiro Takahashi, Hiroki Yokota, Naoyuki Hatayama, Tetsuro Hoshino, Munekazu Naito, Tetsuya Ogawa, Yasushi Fujimoto
Summary: This study compared the decompressive effect of three different procedures (medial, balanced, inferomedial) on the optic nerve canal using 3D printed models. The results showed that all three procedures significantly reduced retrobulbar pressure, with inferomedial decompression achieving the greatest reduction.
GRAEFES ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY
(2022)
Article
Otorhinolaryngology
Yuka Kawade, Yasue Uchida, Saiko Sugiura, Hirokazu Suzuki, Mariko Shimono, Erina Ito, Anna Yoshihara, Izumi Kondo, Takashi Sakurai, Naoki Saji, Tsutomu Nakashima, Emiko Shimizu, Yasushi Fujimoto, Hiromi Ueda
Summary: The study aimed to evaluate the relationship between hearing ability and cognitive domains and determine the changes after introducing a hearing aid for 6 months. Pure tone audiometry and monosyllabic word discrimination score were used to assess hearing ability, and the Mini-Mental State Examination (MMSE) was used to evaluate cognitive domains. The results indicated a significant association between hearing ability and cognitive domains in individuals with impaired cognitive functions, suggesting a potential relationship between cognitive domains, hearing ability, and auditory compensation.
AURIS NASUS LARYNX
(2023)
Article
Oncology
Shunji Takahashi, Nobuhiko Oridate, Kaoru Tanaka, Yasushi Shimizu, Yasushi Fujimoto, Koji Matsumoto, Tomoya Yokota, Tomoko Yamazaki, Masanobu Takahashi, Tsutomu Ueda, Nobuhiro Hanai, Hironori Yamaguchi, Hiroki Hara, Tomokazu Yoshizaki, Ryuji Yasumatsu, Masahiro Nakayama, Kiyoto Shiga, Takashi Fujii, Kenji Mitsugi, Kenichi Takahashi, Nijiro Nohata, Burak Gumuscu, Ramona F. Swaby, Makato Tahara
Summary: The study reports the efficacy of pembrolizumab in Japanese patients with R/M HNSCC, suggesting it as a first-line treatment option. Treatment-related adverse events occurred at a relatively high rate, but the overall safety profile was acceptable.
INTERNATIONAL JOURNAL OF CLINICAL ONCOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Shunpei Yamanaka, Susumu Suzuki, Hideaki Ito, Karnan Sivasundaram, Ichiro Hanamura, Ikuko Okubo, Kazuhiro Yoshikawa, Shoya Ono, Taishi Takahara, Akira Satou, Toyonori Tsuzuki, Ryuzo Ueda, Tetsuya Ogawa, Yasushi Fujimoto
Summary: This study successfully established three mucoepidermoid carcinoma cell lines and characterized their cytogenetic and biochemical features. These cell lines can be used to investigate the disease progression mechanisms and develop novel therapeutics for mucoepidermoid carcinoma.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Mechanics
Seiya Kosako, Mariko Hiramatsu, Yasushi Fujimoto, Yoshiyuki Tsuji
Summary: This study examines the impact of downstream flow in the voice prosthesis during shunt vocalization on the esophageal wall in order to identify the key factors influencing sound generation in the esophagus. Simulations of the trachea and esophagus were performed to measure flow through the voice prosthesis and calculate pressure distribution in the esophageal section. The results demonstrate that temporal variations in pressure downstream of the voice prosthesis and its impingement on the esophageal wall are the primary sources of sound generation within the esophageal section, with the frequency of the generated sound being dependent on the oscillations of the valve.
Article
Oncology
Takashi Maruo, Yasushi Fujimoto, Sayaka Yokoi, Mayu Shigeyama, Naoki Nishio, Mariko Hiramatsu, Michihiko Sone
Summary: Endoscopic cricopharyngeal myotomy (ECPM) is a safe and minimally invasive technique used to treat patients with difficulty in opening their esophageal inlet. A new method using a curved rigid laryngoscope was described for ECPM in patients with dysphagia due to pharyngeal residue. The procedure showed good outcomes in eliminating residue and shortening mealtimes.
MOLECULAR AND CLINICAL ONCOLOGY
(2023)
Article
Optics
Yuya Koyama, Yuki Matsui, Yasushi Fujimoto
Summary: We demonstrated a pulse laser with a fundamental repetition rate of 1 GHz using Yb-Mg-doped silica glass fiber. The laser cavity consisted of a 102-mm-long YbMgSGF as the laser medium and a semiconductor saturable-absorber mirror as a mode-locker. The laser output power reached 5.93 mW with a slope efficiency of 3.6% and a lasing threshold power of 5.3 mW.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
William R. Kerridge-Johns, A. Srinivasa Rao, Yasushi Fujimoto, Takashige Omatsu
Summary: A compact vortex source with red, orange, and dual wavelength emission is presented, using a standard microscope slide as an interferometric output coupler. High quality first order vortex modes are achieved in this setup. The device demonstrates broad emission bands in the orange, red, and near-infrared regions, with potential for green and cyan emission. It is a low-cost, compact, and accessible device for visible vortex applications.
Article
Medicine, Research & Experimental
Miki Kambe, Kazunobu Hashikawa, Keisuke Takanari, Shunjiro Yagi, Kazuhiro Toriyama, Katsumi Ebisawa, Naoki Nishio, Takashi Maruo, Nobuaki Mukoyama, Yasushi Fujimoto, Masazumi Fujii, Kiyoshi Saito, Masakatsu Takahashi, Yuzuru Kamei
Summary: This study reports the experience and long-term outcome of lateral skull base reconstruction with a free omental flap, with a special focus on facial nerve recovery. The study includes 16 patients who underwent the procedure, and the main outcome measures were postoperative complications and facial nerve recovery. The use of a free omental flap is a reliable method for lateral skull base reconstruction, particularly when facial nerve reconstruction is required.
NAGOYA JOURNAL OF MEDICAL SCIENCE
(2023)
Article
Medicine, General & Internal
Tessei Kuruma, Tetsuya Ogawa, Mariko Arimoto, Kinga Yo, Yasushi Fujimoto
Summary: Primary and metastatic malignancies in the sinuses are rare and diverse in histology. The role of fine-needle aspiration cytology (FNAC) and its cytomorphologic characteristics in these tumors have not been specifically addressed. Here, we present two cases of suspected malignant maxillary sinus tumors in elderly patients, aged 85 and 90, who underwent FNAC after unsuccessful tissue biopsies. The diagnoses of squamous cell carcinoma (SCC) and adenocarcinoma were made using FNAC, with the latter case showing identifiable individual cells using the cell block method.
CUREUS JOURNAL OF MEDICAL SCIENCE
(2023)
Article
Oncology
Toshifumi Tomioka, Takeshi Beppu, Tetsuro Onitsuka, Yasushi Fujimoto, Kazuyoshi Kawabata, Kazuto Matsuura, Takashi Fujii, Ryuichi Hayashi, Takahiro Asakage
Summary: The metastatic rate of Levels IIB and V was low in patients classified as cN0. Omitting Level V dissection may be an option in surgical strategies aimed at maintaining arm abduction function. The recovery of arm abduction function post-surgery is related to the arm abduction test score at 1 month post-operatively.
JAPANESE JOURNAL OF CLINICAL ONCOLOGY
(2023)
Meeting Abstract
Oncology
Abdelmoneim A. Mohamed, Ibrahim R. Eissa, Nobuaki Mukoyama, Mohamed Abdelmoneim, Yoshinori Naoe, Shigeru Matsumura, Itzel Bustosvillalobos, Toru Ichinose, Noriyuki Miyajima, Daishi Morimoto, Maki Tanaka, Yasushi Fujimoto, Michihiko Sone, Yasuhiro Kodera, Hideki Kasuya
