A5008435581- Solid State Laser Technologies
- Laser Material Processing Techniques
- Advanced Fiber Laser Technologies
- Tunneling and Rock Mechanics
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Photorefractive and Nonlinear Optics
- Advanced Surface Polishing Techniques
- Structural Response to Dynamic Loads
- Crystal Structures and Properties
- Geoscience and Mining Technology
- Advanced Machining and Optimization Techniques
- Luminescence Properties of Advanced Materials
- Computational Geometry and Mesh Generation
- Drilling and Well Engineering
- Cultural Heritage Materials Analysis
- Diamond and Carbon-based Materials Research
- Advanced machining processes and optimization
- Phase-change materials and chalcogenides
- Image Processing and 3D Reconstruction
- Optimization and Packing Problems
- Advanced Manufacturing and Logistics Optimization
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Photonic Crystal and Fiber Optics
China Academy of Engineering Physics
2019-2024
Laser Research Institute
2018-2019
Hanyang University
2010
The two-dimensional cutting problem requires maximising the sum of profits small rectangular pieces, each which has its own profit and size, obtained from a large plate. In this paper, best-first branch-and-bound algorithm is proposed for unconstrained problem, no limit on number pieces cut. Each piece can have or use area instead profit. extends concept dominated patterns to remove efficiently. Our also duplicate reduce search space. existing upper bound revised new bounding strategy that...
We report an efficient mid-infrared extracavity optical parametric oscillator (OPO) based on the nonlinear crystal BaGa4Se7 pumped by a diode-side-pumped Q-switched Nd:Y3Al5O12 (Nd:YAG) laser. The maximum pulse energy of 1.03 mJ at 4.25 μm is obtained with repetition rate 10 Hz and width 12.6 ns when pump was 13.5 mJ, corresponding to optical-to-optical conversion efficiency 7.6% from 1.064 μm. idler wave slope 12%. To best our knowledge, it highest reported for compact OPO driven Nd:YAG
A high power and efficiency mid-infrared optical parametric oscillator based on a BaGa4Se7 crystal is demonstrated in this paper. It was pumped by 500 Hz Q-switched Nd:YAG laser at room temperature. Without cooling, up to 0.76 W output 4.43 μm generated with respect the incident pump (1064 nm) of 5.52 W, corresponding an optical-to-optical conversion 13.7%. The slope as 18.7%. pulse width signal wave 5.2 ns 13.7 ns. To best our knowledge, date highest achieved 4–5 from 1064 nm BGSe OPO...
Fiber lasers show several advantages over other types of lasers. They are efficient, compact, and rugged since they require few bulk components virtually unaffected by the surrounding environment. Mode-locked mid-infrared (mid-IR) essential for a wide variety applications. The promising applications mode-locked fiber at wavelengths near 3 m include combs generation (metrology), spectroscopic sensors, infrared countermeasures, laser surgery, high-efficient pump sources longer-wavelength...
A multi-wavelength mid-IR laser consisting of 3.05 μm, 4.25 and 5.47 μm BaGa 4 Se 7 (BGSe)optical parametric oscillators (OPOs) switched by DKDP electro-optic switches with one 10 Hz/7.6 ns pumping wave is demonstrated. Maximum energies at are 1.35 mJ, 1.03 0.56 respectively, corresponding to optical-to-optical conversion efficiencies 9.4%, 7.6%, 4.2%. To the best our knowledge, this study first generation three wavelength lasers using switches. Furthermore, provides a viable solution for...
The sealed neutron tube shell dissection process utilizing the traditional lathe turning method suffers from low efficiency and high cost due to frequency of replacement diamond knife. In this study, a hybrid is introduced by combining continuous-wave (CW) laser for efficient tangential groove production with an ultra-short pulse delamination scanning removal. method, high-power CW firstly employed make tapered on shell's surface, then femtosecond used micromachine in order obtain cutting...
The process of casing the wellbore in oil and gas drilling consumes a significant amount time economic resources. High-energy laser rock fracturing, as an efficient cost-effective new approach, holds potential to create glass-like by irradiating rocks alternative traditional casing. mechanism behind vitrification using irradiation, key factor achieving glassified casings, remains be studied. This paper, based on experiments involving scanning sandstone with line laser, investigates numerical...
A theoretical model for the effect of optical path difference on coherent polarization beam combination ultrashort laser pulses is established, and effects spectral width efficiency are studied. The corresponding control index put forward, this research has certain guiding significance design system pulses.
A high power, high-repetition picosecond amplifier with an all-fiber picoseconds seed source, Nd:YVO<sub>4</sub> and Nd:YAG gain medium was designed experimentally studied. For a injected seeder laser repetition rate of 1 MHz average power 2.34 W, 55 W output obtained by the two-stage solid-state amplification, measured pulse width 9.2 ps, wavelength 1064.5 nm. The characteristics different repetitive modes were studied, 18.4 in (1 × 4) burst mode. Since spectrum fiber light is much larger...
A ultrashort pulse Nd:YAG rod gain medium regenerative amplifier side-pumped by laser diode array was studied. The SESAM mode locking fiber seed pulses with 10ps duration 1nJ single energy 50 MHz repetition-rate and the wavelength of 1064 nm, amplified to 1 mJ at kHz our amplifier, corresponding a peak power 0.1 GW, maximum amplification about 3.3×10<sup>6</sup> . And when repetition rate changed 10 kHz, an average 6 W obtained, 2×10<sup>6</sup> period doubling experimentally
Laser rock breaking technology has shown the advantages of fast speed, simple operation and cost saving, great application prospects in hot dry (HDR) geothermal development. However, secondary effect makes it difficult for laser to continuously drill. In this paper, a new drilling method removal by strip rotary scanning is proposed through experiments simulation studies. experiment, minimum specific energy (SE) 8.95 J/mm 3 , when defocus amount -120 mm moving speed 10 mm/s. It concluded that...