A5070908133- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Optical Systems and Laser Technology
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Laser-Matter Interactions and Applications
- Luminescence Properties of Advanced Materials
- Optical and Acousto-Optic Technologies
- Microwave Dielectric Ceramics Synthesis
- Near-Field Optical Microscopy
- Optical Polarization and Ellipsometry
- Ferroelectric and Piezoelectric Materials
- Nonlinear Optical Materials Studies
- Optical Coatings and Gratings
- Silicon Nanostructures and Photoluminescence
- Solid-state spectroscopy and crystallography
- Acoustic Wave Resonator Technologies
- Atmospheric chemistry and aerosols
- Vehicle emissions and performance
- Ocular and Laser Science Research
- Atmospheric and Environmental Gas Dynamics
- Photonic Crystal and Fiber Optics
Wenzhou University
2011-2024
Chinese Academy of Sciences
2009
Fujian Institute of Research on the Structure of Matter
2007
In this work, we demonstrate a watt-level laser producing high-order, petal-shaped output modes with tunable topological charge, by using an axicon-based divergent annular pump beam. The charge of the beam could be varied in range 34–72 adjusting position Nd:YVO4 crystal relative to focal plane highest order petal-mode generated from system had 72 and power 1.3 W. up 2.1 W 34 was achieved at absorbed 5.8 were observed robust under scaling on propagation, same spatial profiles being...
A diode-pumped solid-state laser with watts-level five switchable wavelengths spanning green to red is first experimentally demonstrated. The selective wave-mixing mechanism was introduced for multiple visible wavelength output. are generated by of the fundamental wave, first-Stokes and second-Stokes wave in a Nd:YVO4 self-Raman laser. β-barium borate crystal critical phase-matching angle cut used conversion, angle-tuning method achieve fast switching. diffusion bonded YVO4/Nd:YVO4/YVO4...
An efficient intracavity KTA optical parametric oscillator (OPO) driven by diode-end-pumped acousto-optical Q-switched Nd:YVO(4) laser is demonstrated. The mode mismatch between fundamental cavity and OPO caused the thermal lens effect in crystal as pump power increased was studied. To lessen mismatch, a lens-like mirror made of plane BK7 glass induced idler absorption introduced into cavity. Under diode 20 W, maximum 1535nm light output 3.6 W achieved at pulse repetition rate 60 kHz,...
A diode side-pumped acousto-optic Q-switched Nd:YAP laser operating at 1.3414 microm has been reported. The stabilities of resonators and the influence temperature cooling water on output power have experimentally investigated. average powers pulse widths with different couplers repetition rates also measured analyzed. Under rate 5 kHz, a maximum 47.5 W was obtained an optical-optical conversion efficiency 8.6% slope 20.2%. peak width were 48.8 kW 195 ns FWHM. beam quality factors M(2)...
Laser induced strange blue luminescence in several Raman crystals has been investigated. The at about 473 nm the characteristic of no orientation and only produced crystal where fundament laser oscillated. experimental results show that must result from fundamental around 1.0 µm rather than Stokes-shifting. spectrum detected is similar for different crystals. This obviously inconsistent with traditional theories, which maybe a brand-new theory.
Laser induced strange blue luminescence in several Raman crystals has been investigated. The at about 473 nm the characteristic of no orientation and only produced crystal where fundament laser oscillated. experimental results show that must result from fundamental around 1.0 µm rather than Stokes-shifting. spectrum detected is similar for different crystals. This obviously inconsistent with traditional theories, which maybe a brand-new theory.
LuAl 3 (BO ) 4 crystal at
A solid immersion Fresnel zone plate (SIFZP) is designed and its near-field imaging characteristics are analyzed using the vector angular spectrum method. Results show that SIFZP can generate a high intensity subwavelength focus.
报道了基于半导体激光端面抽运的a切Nd：GdVO4晶体级联自拉曼激光的输出特性。利用Nd：GdVO4晶体的优异激光特性和较强的拉曼增益，结合使用针对级联拉曼设计的宽带高反腔镜，在声光Q开光调制下，成功实现了基于882 cm-1频移的1 309 nm波长二阶斯托克斯激光输出。在10 W入射抽运功率和50 kHz重复频率下，获得了平均输出功率1.48 W，脉冲宽度5.3 ns的1 nm激光输出，对应的二阶斯托克斯激光阈值和光光转换效率分别为5.9 W和14.8%。结果表明：以Nd：GdVO4作为自拉曼晶体，通过级联拉曼可实现高效二阶斯托克斯激光输出，对丰富固体激光波长具有重要价值。
采用非临界相位匹配切割，尺寸5 mm×5 mm×20 mm的KTA作为非线性光学晶体，进行了基于半导体激光端面抽运Nd：YLF/KTA的内腔式连续光学参量振荡激光研究，获得了中红外3.5 μm波段的连续激光输出。为了提高连续光参量振荡腔内信号光的功率密度，降低激光输出阈值，采用对信号光高反射的单谐振腔结构进行激光实验。在8.35 W的抽运功率下，分别获得了335 mW和110 mW 的3440 nm和1505 nm的激光输出，对应的总转换效率达到了5.6%。该实验研究表明半导体激光端面抽运的内腔式KTA连续光学参量振荡也能获得高效的中红外激光输出。
报道了基于KTA晶体671 cm−1和234 cm−1频移的LD端面抽运被动调Q级联拉曼激光器。采用Nd:YAG/Cr 4+:YAG复合晶体产生被动调Q的脉冲基频激光来驱动KTA晶体，研究了不同入射抽运功率下级联拉曼激光的输出功率、光谱和脉冲特性。随着抽运功率的增加，输出激光波长从以671 cm−1频移级联拉曼的1178 nm单波长过渡到与1212 nm同时输出的双波长。在10.05 W的入射抽运功率下，获得了280 mW平均输出功率，6.2%转化效率的双波长激光。对应的脉冲宽度和重复频率分别为1.2 ns和10.3 kHz，单脉冲能量和峰值功率分别为27.2 μJ和22.7 kW。结果表明：基于KTA两个相当增益强度的频移，结合腔镜镀膜控制可以获得丰富的斯托克斯激光波长。
Thermal lens effects in the LD end-pump fundamental and self-Raman crystal laser have been studied. The experiment of pump beam waist position affect on resonator stability was carried out. results show that sensitive to for solid-state laser. focal length formulas were given out, which both far-field half-angle active medium considered.
To obtain stable laser outputs,bigger turning ranges and higher transfer efficiencies by a simple compact resonance cavity,a V-type Optical Parametric Oscillator(OPO) pumped 1 064nm Nd∶YVO4 is designed,and broadband wavelength-tunable,continuous-wave(CW) mid-infrared sources are obtained.The crystal 808nm semiconductor to generate as the fundamental frequency light,and cavity used control spots change grating period temperature of PPMgLN 2 249 3 706nm tunable idler output.With an 808-nm pump...