Article
Polymer Science
Pen Yiao Ang, Marko Cehovski, Frederike Lompa, Christian Haenisch, Dinara Samigullina, Sebastian Reineke, Wolfgang Kowalsky, Hans-Hermann Johannes
Summary: Organic thin-film lasers are considered potential light sources with advantages such as low cost, high performance, and color tunability. This study tested the feasibility of using organic dye-doped PMMA as an organic dye laser and found the best sample design model.
Article
Optics
Arindam Sarkar, Roopa Venkataraj, Akshay R. Krishna, B. Anugop, V. P. N. Nampoori, M. Kailasnath
Summary: This report introduces a novel method to achieve random lasing in the diffusion regime, demonstrating a cylindrical microstructure cavity made of a silica polymer combination to overcome the issue of directionality in conventional random lasers. The study also showcases a random laser mediated by metal nanowire in a cladded microstructure for the first time, observing the lowering of threshold and spectral shift with nanowire concentration. Additionally, the directional laser emission with a narrow spectral line was achieved in experiments, characterizing the lasing modes in terms of emission wavelength, lasing threshold, and temporal evolution.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Nideesh Padiyakkuth, Rodolphe Antoine, Nandakumar Kalarikkal
Summary: The development of novel polymer nanofiber-based photonic devices has led to improved optical materials, extremely appealing for random lasers. Electrospun polymer fibers have been proposed as convenient materials for random lasers, offering a versatile and low-cost strategy for developing new scattering materials. In this study, electrospun PVDF polymer mats doped with R6G dye were utilized to observe the transition from amplified spontaneous emission to lasing with coherent feedback by increasing the gain concentration.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Bingrong Shi, Yanli Shen, Haoran Ma, Hao Lv, Shuaiyi Zhang, Xia Wang
Summary: Photoluminescence is a new research hotspot in the field of nano-materials and nano-structures. It is widely used in medical imaging, biosensors, integrated devices, etc. due to its excellent optical performance and good stability. This study focuses on the design and fabrication of dye-doped multilayer systems using a convenient spin-coating method. The effects of sandwich-like film and Au nanoparticles on the lasing characteristics were studied. The results show that both the sandwich-like film and Au nanoparticles can enhance the lasing intensity.
Article
Materials Science, Multidisciplinary
Fabio S. De Vicente, Leandro X. Moreno, Marcus V. A. Prado, Luis M. G. Abegao, Leandro A. Melo, Jose J. Rodrigues Jr, Marcio A. R. C. Alencar
Summary: Mesoporous silica SBA-15 with a hexagonal pore structure and high surface area is suitable for filling with luminescent chromophores for optical and photonic applications. Experiments show that SBA-15 infiltrated with RB can generate tunable random laser emissions, indicating the potential for developing solid-state random lasers.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Optics
Hong Chen, Shaohua Gao, Fei Gao, Jianzhong Zhang, Lijun Qiao, Tao Wang, Mingjiang Zhang
Summary: Random lasing was successfully generated in a short erbium-doped fiber with the lowest threshold power of 15.2 mW and maximum optical conversion efficiency of 16% observed at 11m EDF length. The output spectral characteristics showed random spectral peaks with high OSNR and narrowed linewidth of 300 Hz, indicating potential for development of narrow linewidth ERFL.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Tatevik M. Sarukhanyan, Hermine Gharagulyan, Mushegh S. Rafayelyan, Sergey S. Golik, Ashot H. Gevorgyan, Roman B. Alaverdyan
Summary: This paper investigates the lasing possibilities of a dye-doped polymer layer embedded in a wedge-shaped CLC, showing that multimode laser generation is possible due to the observation of multiple defect modes. Simulations based on a wide range of CLC thickness demonstrate both periodic and continuous generation of defect modes along specific spectral lines. The robust spectral behavior of induced defect modes is unique and has not been observed in similar CLC-based structures.
Article
Optics
Ali Bavali, Ali Rahmatpanahi, Zahra Niknam
Summary: The angular dependence of diffusive random laser emission is evaluated by exciting a highly concentrated solution. Dimerization at high concentrations leads to random fluctuation of the dielectric constant and provides multiple scattering events and enhanced backscattering. Förster resonance energy transfer and anisotropic inner filter effect have a significant impact on the unique spectral features of RL emission.
Article
Polymer Science
Konrad Cyprych, Lech Sznitko
Summary: This study investigates the random lasing phenomenon in a dye-doped polymeric double-phase system and explores how relative concentrations of polymers can influence lasing parameters. The influence of phase separation-induced disorder on supporting RL, the ability to switch between waveguiding and quasi-waveguiding regimes, and the fabrication of efficient materials for RL using a simple phase separation technique are highlighted. The technique offers a fast, cheap, and easy way to tailor lasing properties in the laser material fabrication process.
Article
Optics
Yaoxing Bian, Hanyi Xue, Zhaona Wang
Summary: A programmable random laser was designed to dynamically regulate random lasing pulses through introducing an external waveguide structure with random scattering feedback, achieving liquid and solid film random lasers separately. By switching the adhesion/separation state between the gain and the destroyed waveguide structure, various pulse time series of random lasing can be flexibly realized. The Feinam coding system is further realized for encryption and information transmission by combining programmable random pulses, expanding the application prospects of random lasers in various fields.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Kamila Lupinska, Martyna Durko-Maciag, Chantal Andraud, Yann Bretonniere, Piotr Hanczyc, Piotr Fita, Piotr Szulim, Jaroslaw Mysliwiec, Lech Sznitko
Summary: The 2,4,6-OMe-TCF dye with aggregation-induced emission (AIE) phenomenon is studied for laser light generation. Strong light amplification is possible only for concentrated solutions near saturation level, indicating the essential role of aggregation in enhancing light emission. Additionally, powdered form of the dye also exhibits lasing, but with a red-shifted gain profile. The dye can be used both in liquid solution and as dopant for polymeric matrices, making it suitable for soft and elastic materials in printed optoelectronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Antonino Madonia, Gianluca Minervini, Angela Terracina, Ashim Pramanik, Vincenzo Martorana, Alice Sciortino, Carlo M. Carbonaro, Chiara Olla, Teresa Sibillano, Cinzia Giannini, Elisabetta Fanizza, Maria L. Curri, Annamaria Panniello, Fabrizio Messina, Marinella Striccoli
Summary: Carbon dots with high efficiency red emission have been synthesized by solvothermal method using Neutral Red as a precursor. The obtained nanoparticles exhibit intense luminescence in the red region, comparable to the starting dye, and are capable of emitting light in the solid-state.
Article
Materials Science, Multidisciplinary
Atiqah Nabieha Azmi, Wan Maryam Wan Ahmad Kamil, Haslan Abu Hassan, Wan Zakiah Wan Ismail, Otto L. Muskens
Summary: A novel method of doping Aluminum (Al) into zinc oxide (ZnO) nanorods by a simple chemical dip process is evaluated in terms of its performance in random lasing. The ZnO nanorods were synthesized using chemical bath deposition (CBD) method at 96 degrees C for 3 h. The nanorods were then dipped in a fixed doping solution concentration, and the dip time was varied between 0 s and 80 s. Doping ZnO nanorods in aluminum nitrate nonahydrate solution for 40 s contributes to random lasing with the lowest threshold value of 12.48 mJ/cm2 and a spectral width of 2.12 nm.
Article
Chemistry, Multidisciplinary
Fengfeng Yao, Yanbo Pei, Chunfeng Hou, Xiudong Sun
Summary: This study investigates the dependence of random lasing properties on the gain volume in dye doped nematic liquid crystals. By changing the distance between the focal point and the sample, the transition process from Fabry-Perot like mode to random mode was observed, suggesting underlying mechanisms. These observed pump volume dependent lasing properties could be used to manipulate the mode and threshold of random lasers.
Article
Optics
Wenyu Du, Xiaojuan Zhang, Chao Li, Zhigang Cao, Siqi Li, Liang Lu, Sheng Cheng, Jiajun Ma, Junxi Zhang, Benli Yu, Zhijia Hu
Summary: Experimental results show that the average polarization degree is up to 0.88 before the thermal treatment. The polarization degree remains high and increases to 0.99 after annealing, which indicates that random lasers with stable and high polarization degree have been realized.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Physics, Applied
Taisuke Eto, Masanori Takabayashi, Atsushi Okamoto, Masatoshi Bunsen, Takashi Okamoto
JAPANESE JOURNAL OF APPLIED PHYSICS
(2016)
Article
Optics
Masanori Takabayashi, Taisuke Eto, Takashi Okamoto
Article
Optics
Masanori Takabayashi, Atsushi Okamoto, Taisuke Eto, Takashi Okamoto
Article
Biochemical Research Methods
Takashi Okamoto, Tatsuya Kumagawa, Masafumi Motoda, Takanori Igarashi, Keisuke Nakao
JOURNAL OF BIOMEDICAL OPTICS
(2013)
Article
Optics
Takashi Okamoto, Shuhei Fujita
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2008)
Article
Optics
Takashi Okamoto, Shiro Adachi
Article
Chemistry, Multidisciplinary
Takashi Okamoto, Masaki Mori
APPLIED SCIENCES-BASEL
(2019)
Article
Optics
Takashi Okamoto, Keigo Imamura, Kouki Kajisa
Summary: This study presents a design scheme for achieving laser emission with a specified spectral shape by utilizing the structure of disordered gain media. The use of a scattering medium with a checkerboard structure allows for random lasing. Structural optimization through a direct binary search method enables the concentration of emitted light at a single wavelength or within a specific wavelength range. The impact of pump rate and manufacturing errors on the optimized spectrum of laser emission is also examined.
OPTICS COMMUNICATIONS
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Yoshinao Nagashima, Yuko Ohsugi, Makiko Hiraishi, Yoshifumi Niki, Akira Fuji, Masataka Majima, Takashi Okamoto
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Takashi Okamoto, Masaki Mori, Tatsuma Haruno
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)
(2017)
Proceedings Paper
Optics
Taisuke Eto, Masanori Takabayashi, Atsushi Okamoto, Masatoshi Bunsen, Takashi Okamoto
2015 20TH MICROOPTICS CONFERENCE (MOC)
(2015)
Proceedings Paper
Optics
Yoshinao Nagashima, Yuko Ohsugi, Yoshifumi Niki, Kouji Maeda, Takashi Okamoto
BIOPHOTONICS JAPAN 2015
(2015)
Article
Optics
Masanori Takabayashi, Atsushi Okamoto, Taisuke Eto, Takashi Okamoto
Article
Optics
T Okamoto, A Fukuyama
