The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Yonghang Shen - One of the best experts on this subject based on the ideXlab platform.
-
high energy mid infrared laser Pulse Output from a baga4se7 crystal based optical parametric oscillator
Optics Letters, 2020Co-Authors: Yongchang Zhang, Zhuang Li, Bo Wu, Yonghang ShenAbstract:We report a high energy, narrow spectral linewidth mid-infrared laser Pulse Output from a Nd:Y3Al5O12 laser-pumped BaGa4Se7 (BGSe) crystal-based optical parametric oscillator (OPO). Output Pulse energy of 21.5 mJ was obtained at 3816 nm, with spectral width of 12 nm and Pulse width of 11.4 ns, corresponding to peak power as high as 1.89 MW. A BGSe crystal with aperture size of 10mm×10mm and length of 16 mm was applied as the nonlinear crystal in a pump fed back OPO for achieving such high Pulse energy Output from the simple oscillator scheme.
-
High energy mid-infrared laser Pulse Output from a BaGa 4 Se 7 crystal-based optical parametric oscillator
Optics Letters, 2020Co-Authors: Yongchang Zhang, Zhuang Li, Bo Wu, Yonghang ShenAbstract:We report a high energy, narrow spectral linewidth mid-infrared laser Pulse Output from a Nd:Y3Al5O12 laser-pumped BaGa4Se7 (BGSe) crystal-based optical parametric oscillator (OPO). Output Pulse energy of 21.5 mJ was obtained at 3816 nm, with spectral width of 12 nm and Pulse width of 11.4 ns, corresponding to peak power as high as 1.89 MW. A BGSe crystal with aperture size of 10mm×10mm and length of 16 mm was applied as the nonlinear crystal in a pump fed back OPO for achieving such high Pulse energy Output from the simple oscillator scheme.
-
Multi-wavelength mode-locked Er/Yb Co-doped fiber laser with square nano-second Pulse Output
Laser Physics, 2011Co-Authors: W. Ye, Jianli Wang, Ting Chen, Yonghang ShenAbstract:We report a multi-wavelength mode-locked Er/Yb codoped fiber laser with square nano-second Pulse Output, which is constructed with a “figure-of-eight” cavity structure. A section of polarization-maintaining Er/Yb co-doped double clad fiber was used as the gain medium and pumped by a fiber pigtailed multimode laser diode working at 975 nm via a multimode fiber combiner. Several megahertz repetition rate Output Pulses with peak power up to 9.2 W and Pulse duration around several nanoseconds were obtained.
-
linearly polarized q switched Pulse yb fiber laser with average Output power over 10 w
Laser Physics Letters, 2009Co-Authors: Yidong Wang, Dingzhong Yang, Peipei Jiang, Yonghang ShenAbstract:We report an acousto-optic (AO) Q-switched fiber laser with linearly polarized short Pulse Output. The fiber laser was set up by applying a piece of large mode area polarization maintaining Yb fiber of 1 meter length as the gain medium and a free-space AO Q-switch as the modulating element. The fiber laser was pumped by a fiber pigtailed laser diode working at 976 nm. By suitably adjusting the distance between the AO Q-switch and the cavity mirror, stable Q-switched short Pulse laser Output was achieved with Output power up to 10 W and repetition rate between 20 kHz and 50 kHz. The shortest Pulse duration of 33 ns was achieved at repetition rate of 20 kHz when the Output power reached about 10 W.
Yong Feng Lu - One of the best experts on this subject based on the ideXlab platform.
-
all fiber passively mode locked thulium doped fiber ring laser using optically deposited graphene saturable absorbers
Applied Physics Letters, 2013Co-Authors: Qingqing Wang, Yong Feng Lu, Tong Chen, Botao Zhang, Mingshan Li, Kevin P ChenAbstract:An all-fiber passively mode-locked thulium-doped fiber ring oscillator is constructed using optically deposited few layer graphene micro-sheets as the saturable absorber (SA). The mode-lock operation was achieved by 130-mW pump power at 1.5-μm. The fiber oscillator produces 2.1-ps soliton Pulse Output with 80-pJ per Pulse energy. The 3-dB bandwidth of the laser Output was measured as 2.2-nm. The RF signal-to-noise ratio of 50-dB and sub 20-Hz 3-dB bandwidth of the laser Output confirms the stable laser operation with low time jittering. This paper shows that graphene can be an effective saturable absorber for the development of mid-IR fiber mode-locked laser.
-
LASER SURFACE CLEANING IN AIR - MECHANISMS AND APPLICATIONS
Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers, 1994Co-Authors: Yong Feng Lu, Masaki Takai, Yoshinobu Aoyagi, Mikio Takai, Shigetou Namba, Yoshinobu Aoyagi, Susumu NambaAbstract:Surface contaminations are removed by laser irradiation with Pulse Output and short wavelength in ambient air. It is a dry cleaning process to remove surface contaminations without using ultrasonic cleaning requiring carbon fluorochloride and other organic solvents. The mechanisms of laser cleaning may include laser photodecomposition, laser ablation and surface vibration due to the impact of the laser Pulse. Examples of cleaning metal surfaces and magnetic head sliders show that this cleaning process could be widely used in various industrial applications. [References: 41]
-
Laser cleaning - a new surface cleaning method without pollutions
Materials Research Society Symposium - Proceedings, 1994Co-Authors: Yong Feng Lu, Yoshinobu AoyagiAbstract:Surface contaminations are removed by laser irradiation with Pulse Output and short wavelength from various substrate such as magnetic head slide, glass and metals. Laser cleaning is a new dry process to remove surface organic contaminations without using ultrasonic cleaning in organic solvents. This provides a new dry process to clean different substrate surfaces and can take the place of conventional wet cleaning processes such as ultrasonic cleaning with CFC and other organic solvents. The mechanisms of laser cleaning may include laser photodecomposition, laser ablation and surface vibration due to the impact of laser Pulse. It is found that short wavelength and short Pulse duration are necessary for effective cleaning. It is also found that an appropriate energy density is critical to achieve effective cleaning without causing surface oxidation and secondary contamination.
Yidong Wang - One of the best experts on this subject based on the ideXlab platform.
-
linearly polarized q switched Pulse yb fiber laser with average Output power over 10 w
Laser Physics Letters, 2009Co-Authors: Yidong Wang, Dingzhong Yang, Peipei Jiang, Yonghang ShenAbstract:We report an acousto-optic (AO) Q-switched fiber laser with linearly polarized short Pulse Output. The fiber laser was set up by applying a piece of large mode area polarization maintaining Yb fiber of 1 meter length as the gain medium and a free-space AO Q-switch as the modulating element. The fiber laser was pumped by a fiber pigtailed laser diode working at 976 nm. By suitably adjusting the distance between the AO Q-switch and the cavity mirror, stable Q-switched short Pulse laser Output was achieved with Output power up to 10 W and repetition rate between 20 kHz and 50 kHz. The shortest Pulse duration of 33 ns was achieved at repetition rate of 20 kHz when the Output power reached about 10 W.
Xiaobo Zhang - One of the best experts on this subject based on the ideXlab platform.
-
339 j high energy ti sapphire chirped Pulse amplifier for 10 pw laser facility
Optics Letters, 2018Co-Authors: Wenqi Li, Lianghong Yu, Cheng Wang, Lu Xu, Min Xu, Yin Hang, Yi Xu, Jianye Wang, Pei Huang, Xiaobo ZhangAbstract:We report on the laser Pulse Output of 339 J centered at 800 nm from a chirped-Pulse amplification (CPA) Ti:sapphire laser system at the Shanghai Superintense Ultrafast Laser Facility. The experimental results demonstrated that the parasitic lasing as well as the transverse amplified spontaneous emission of the homemade 235-mm-diameter Ti:sapphire final amplifier were suppressed successfully via the temporal dual-Pulse pumped scheme and the index-matching liquid cladding technique. The maximum pump-to-signal conversion efficiency of 32.1% was measured for the final amplifier. With a compressor transmission efficiency of 64% and a compressed Pulse duration of 21 fs obtained for the sample light at a lower energy level, this laser system could potentially generate a compressed laser Pulse with a peak power of 10.3 PW. The experimental results represent significant progress with respect to the CPA laser.
Kai Chen - One of the best experts on this subject based on the ideXlab platform.
-
A Study on Fault Diagnosis of Redundant SINS with Pulse Output
Proceedings of the 2nd International Conference on Advances in Mechanical Engineering and Industrial Informatics (AMEII 2016), 2016Co-Authors: Yinan Wang, Kaikai Dong, Kai ChenAbstract:The missile-based redundant SINS (strap-down inertial navigation system) Output the measurement data by using Pulse quantization. Pulse quantization can disorganize the errors in the original measurement signal, cause an instantaneous drift of 50 degree/hour, and thus brings about great difficulty to the process of fault diagnosis. Focusing on the problem that the Pulse quantization results in difficulty to the fault diagnosis of the redundant SINS, this paper proposes a method that using a low pass filter reduces the quantization noise. Based on GLT (generalized likelihood test) method, one of the methods used for fault diagnosis of the redundant SINS and combined with a low pass filter, this paper studies the effects before and after the fault diagnosis comparatively and draws a conclusion that a low pass filter is helpful for improving the effect of quantitative fault diagnosis. The result of the simulation experiment shows that the effect of the fault diagnosis after improving is close to that before using Pulse quantization, and that the effect can detect the order of 5 degree / hour accurately.
-
Acousto-Optic Q-Switched Pulse Fiber Laser with the Peak Power of 9kW
Advanced Materials Research, 2013Co-Authors: Ji Wang, Kai Chen, Guo-zheng WangAbstract:An acousto-optic Q-switched Pulse fiber laser was presented, and the Output power of 20.3W was obtained by using the one-stage Ytterbium-doped double-cladding fiber amplification. The repetition frequency of the Pulse fiber laser was tunable in the range of 20-60kHz. We obtained the Pulse Output with Pulse width of 113ns, peak power of 9kW and the average power of 20.3W, when the repetition frequency was 20kHz. We also measured Pulse width at different repetition rate and analyzed Pulse waveform.
-
Acousto-optic Q-switched Pulse fiber laser with the peak power of 17.33kW
2012 International Conference on Optoelectronics and Microelectronics, 2012Co-Authors: Ji Wang, Guo-zheng Wang, Wenjing Li, Kai ChenAbstract:An acousto-optic Q-switched Pulse fiber laser was presented, and the Output power of 20.1W was obtained by using the one-stage Ytterbium-doped double-cladding fiber amplification The repetition frequency of the Pulse fiber laser was tunable in the range of 20-80 kHz. By adjusting the rise time of the acousto-optic modulator, we obtained the Pulse Output with Pulse width of 58ns and peak power of 17.33kW, when the repetition frequency was 20kHz. The change of Pulse width along with rise time of the modulator was measured. The effect of modulation signal duty ratio on Output Pulse properties was analyzed.
