This paper presents the results of experimental studies on Q-switched flash-lamp pumped Nd:YAG and Er:glass lasers with resonators formed by volume Bragg gratings. This novel design results in single-frequency mode operation with millijoules pulse energy. The mode selection is performed only by volume Bragg gratings that dramatically simplifies laser design.
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http://dx.doi.org/10.1364/oe.16.009199 | DOI Listing |
Light Sci Appl
January 2025
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Institute of Nanoscience and Applications, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China.
Colloidal quantum dots (CQDs) are attractive gain media due to their wavelength-tunability and low optical gain threshold. Consequently, CQD lasers, especially the surface-emitting ones, are promising candidates for display, sensing and communication. However, it remains challenging to achieve a low-threshold surface-emitting CQD laser array with high stability and integration density.
View Article and Find Full Text PDFJ Phys Chem B
December 2024
Department of Teacher Education, NTNU─Norwegian University of Science and Technology, Trondheim NO-7491, Norway.
Lattice models are a central idea in statistical thermodynamics, as they allow for the introduction of a configurational entropy by counting the multiplicity of placing indistinguishable particles on a lattice. In this work we use a lattice model to show that the configurational entropy needs to be merged with the molecular translational entropy in order to have a consistent model. This is achieved by replacing the volume of a lattice site with a quantum volume (i.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK, LS2 9JT.
Nanophotonics
September 2024
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, China.
Two-dimensional (2D) layered materials without centrosymmetry, such as GaSe, have emerged as promising novel optical materials due to large second-order nonlinear susceptibilities. However, their nonlinear responses are severely limited by the short interaction between the 2D materials and light, which should be improved by coupling them with photonic structures with strong field confinement. Here, we theoretically design photonic crystal circular Bragg gratings (CBG) based on hole gratings with a quality factor as high as = 8 × 10, a mode volume as small as = 1.
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