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Narrow-line InGaN/GaN green laser diode with high-order distributed-feedback surface grating
摘要： We demonstrate narrow-line green laser emission at 513.85 nm with a linewidth of 31 pm and side-mode suppression ratio of 36.9 dB, operating under continuous-wave injection at room temperature. A high-order (40th) distributed-feedback surface grating fabricated on multimode InGaN-based green laser diodes via a focused ion beam produces resolution-limited, single-mode lasing with an optical power of 14 mW, lasing threshold of 7.27 kA cm?2, and maximum slope efficiency of 0.32 W A?1. Our realization of narrow-line green laser diodes opens a pathway toward efficient optical communications, sensing, and atomic clocks.
关键词： InGaN/GaN,green laser diode,distributed-feedback,narrow-line,surface grating
更新于2025-11-28 14:23:57
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Process studies on copper laser beam welding over gap by using disc laser at green wavelength
摘要： The increasing demand for the substitution of the internal combustion engine vehicles to the battery electric vehicles requires beside battery cells high performance power electronic devices such as power control units (PCU). However, a combined requirement of high junction temperature stability and a large joint area of the interconnection on the PCU is a challenge for the conventional joining method such as soldering and wire bonding process. The Laser Impulse Metal Bonding (LIMBO) process enables a high temperature stable weld joint and large joint area. During the LIMBO process only minimized thermal stress is induced into the underlying substrate by a spatial separation between both joining partners in an overlap configuration with a gap. Hence, an energetic separation between the melting and joining phase is given. In this paper, the LIMBO process is firstly investigated with the disc laser at wavelength λ = 515 nm. Due to the enhanced absorptivity of the laser beam at this wavelength on copper material, the process duration of the LIMBO process is about the half compared to the LIMBO process with wavelength λ = 1064 nm.
关键词： Shadow projection,Green laser beam,Heat conduction welding mode,Laser beam micro joining,LIMBO
更新于2025-09-23 15:19:57
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A Fast Analysis Method for Blue-Green Laser Transmission through the Sea Surface
摘要： The fast estimation of blue-green laser transmission characteristics through the fluctuating sea surface, such as refraction angles and transmittance, is very important to correct operating parameters, detection depth and anti-detection warning in airborne Light Detection and Ranging (LiDAR) applications. However, the geometry of the sea surface is changed by complex environment factors, such as wind and wave, which significantly affect the rapid acquisition of the blue-green laser transmission characteristics. To address this problem, a fast analysis method is provided to rapidly compute the blue-green laser transmittance and refraction angles through the fluctuating sea surface driven by different wind directions and speeds. In the method, a three-dimensional wave model driven by the wind was built to describe the wave spatial distribution varying with time. Using the wave model, the propagation path of the scanning laser footprint was analyzed using the proposed meshing method, thus the transmittance and refraction angles of the optical path can be fast obtained by using parallel computing. The simulation results imply that the proposed method can reduce the time consumption by 70% compared with the traditional analytical method with sequential computing. This paper provides some statistical laws of refraction angles and transmittance through the fluctuating sea surface under different wind conditions, which may serve as a basic for fast computation of airborne LiDAR transmission characteristics in complex environments.
关键词： blue-green laser,sea surface,refraction angles,wave model,transmission characteristics,transmittance,airborne LiDAR
更新于2025-09-23 15:19:57
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Green-laser-doped selective emitters with separate BBr3 diffusion processes for high-efficiency n-type silicon solar cells
摘要： Laser-doped boron selective emitters are an ideal candidate for enabling less emitter recombination, lower contact resistance and better blue response of efficient n-type silicon solar cells. However, the low boron concentration of the borosilicate glasses formed during boron diffusion processes and the implementation of ultraviolet lasers have hindered the commercialization of laser-doped boron selective emitters. In this contribution, separate BBr3 diffusion processes for green-laser-doped selective emitters are demonstrated. Laser doping processes were conducted between (1) borosilicate glass deposition and boron driving in and (2) post-oxidation, achieving the optimized laser doped selective emitter with the Rsheet,pt/Rsheet,ptt of 95.0 Ω/□/54.3 Ω/□, accompanying with the pt profile of Nmax < 1.4? 1019 cm(cid:0) 3. By comparison to the homogeneous emitter with sheet resistance of 88.9 Ω/□, J0e, total of 45.3 fA/cm2 and ρc, metal of 2.9 mΩ/cm2, the employment of the optimum laser doped selective emitter has resulted in the J0e, total of 31.1 fA/cm2 and the ρc, metal of 1.0 mΩ/cm2. Finally, the improvement of simulated VOC (699.6 mV), FF (81.38%) and efficiency (23.13%) were obtained by using the optimized laser doped SEs, compared with the simulated VOC (694.5 mV), FF (81.14%) and efficiency (22.89%) of the reference. Separate BBr3 diffusion processes for green-laser-doped selective emitters demonstrate the employment of industrial green laser and boron diffusion furnace, instead of expensive ultraviolet laser and other complex boron resources, indicating a promising potential for industrial feasibility.
关键词： Driving in,Separate BBr3 diffusion,N-type silicon solar cells,Post-oxidation,Green-laser-doping,Selective emitter
更新于2025-09-19 17:13:59
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Compact CW Nd:YVO4/PPMgLN green laser
摘要： A compact and reliable linear-beam Nd:YVO4/PPMgLN green laser pumped by an edge-emitting laser diode array (24 separate emitters with an overall length of 480 μm and a gross power of 45 W at 807.1 nm) is achieved. The independent 24-edge-emitting array can achieve poor spatial coherence and e?ectively reduce laser speckle e?ect. In the air-cooled (water-cooled) condition, the maximum output power is 8.64 W (11.10 W), the optical-optical conversion e?ciency is 24 % (25 %), and the power variation is less than 3 % (2 %) for 1 h (3 h).
关键词： Nd:YVO4 laser,Green laser,PPMgLN
更新于2025-09-16 10:30:52
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260?W of average green beam generation by intracavity frequency-doubled acousto-optic Q-Switched Nd:YAG laser
摘要： We developed an intracavity frequency-doubled acousto-optic Q-switched Nd:YAG laser generating * 260 W of average green power using two identical diode-pumped gain modules with ?vefold pumping symmetry in a simple two mirror linear cavity con?guration. The corresponding optical to optical conversion ef?ciency was estimated to be * 16.8%. At maximum output power, individual green pulse duration (FWHM) was measured to be * 73 ns with a pulse repetition rate of 18 kHz. The output average green power was highly stable with measured ?uctuation in average green power ± 0.83 W over 5 h of continuous operation. The jitter in pulse delay time and pulse to pulse amplitude ?uctuation was measured to be within ± 4.25 ns and ± 5%, respectively. The maximum beam drift recorded at 5 m distance away from the laser system was * 14 micron corresponding to beam pointing stability of ± 2.8 micro-rad.
关键词： Acousto-optic Q-switching,Intracavity frequency conversion,Diode-pumped solid-state lasers,High-power green laser
更新于2025-09-11 14:15:04
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Fabrication of Chlorophyll-Incorporated Nanogels for Potential Applications in Photothermal Cancer Therapy
摘要： Nanogels have been widely used in biomedical applications, such as carriers for hyperthermia cancer treatment, drug delivery, and imaging. Owing to the enhanced permeability and retention effect, nanogels have shown a great potential in cancer therapy. In this study, sodium copper chlorophyllin (SCC), a low cytotoxicity and biodegradable photothermal agent, was copolymerized with a nanogel of N-[3-(dimethylamino)propyl]methacrylamide. The nanogels could produce heat under exposure to a green laser with a 532 nm wavelength. The positively charged nature of the nanogels enhanced the endocytosis of the nanogels. The cell mortality was greatly enhanced with the treatment of the SCC-containing nanogels and green light illumination. Our results suggest the potential of SCC-containing nanogels in photothermal cancer therapy.
关键词： sodium copper chlorophyllin,photothermal therapy,nanogels,cancer therapy,green laser
更新于2025-09-10 09:29:36