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CAS IR Grid
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长春光学精密机械与物... [4]
西安光学精密机械研究... [3]
武汉岩土力学研究所 [2]
金属研究所 [1]
半导体研究所 [1]
上海光学精密机械研究... [1]
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Numerical investigation of the effects of fracturing fluid parameters on hydraulic fracture propagation in jointed rock mass based on peridynamics
期刊论文
OAI收割
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS, 2022, 卷号: 135, 页码: 38-51
作者:
Qin, Mingqi
;
Yang, Diansen
;
Chen, Weizhong
  |  
收藏
  |  
浏览/下载:30/0
  |  
提交时间:2022/04/11
Peridynamics
Fractured rock mass
Fracturing fluid viscosity
Pumping rate
流量对水力压裂破裂压力和增压率的影响研究
期刊论文
OAI收割
岩土力学, 2020, 卷号: 41, 期号: 7, 页码: 2411
作者:
邵长跃
;
潘鹏志
;
赵德才
;
姚天波
;
苗书婷
  |  
收藏
  |  
浏览/下载:26/0
  |  
提交时间:2021/05/25
hydraulic fracturing
pumping rate
pressurization rate
breakdown pressure
low permeability hard and brittle rock
水力压裂
流量
增压率
破裂压力
低渗透硬脆岩石
High peak power mid-infrared 2.8 μm pulsed fiber laser
期刊论文
OAI收割
Guangzi Xuebao/Acta Photonica Sinica, 2016, 卷号: 45, 期号: 11
作者:
Shen, Yan-Long
;
Wang, Yi-Shan
;
Chen, Hong-Wei
;
Huang, Ke
;
Tao, Meng-Meng
收藏
  |  
浏览/下载:16/0
  |  
提交时间:2016/12/23
Choppers (circuits)
Erbium
Fiber lasers
Fibers
Infrared devices
Optical pumping
Pulse repetition rate
Pumping (laser)
Q switched lasers
Q switching
Two side liquid-cooled and passively Q-switched disk oscillator with nanosheets in flowing CCl4
期刊论文
OAI收割
applied physics b-lasers and optics, 2016, 卷号: 122, 期号: 9
作者:
Nie, Rongzhi
;
She, Jiangbo
;
Li, Dongdong
;
Li, Fuli
;
Peng, Bo
收藏
  |  
浏览/下载:20/0
  |  
提交时间:2016/10/14
Absorption refrigeration
Coolants
Energy efficiency
Graphene
Laser beams
Laser mirrors
Mirrors
Molybdenum compounds
Nanosheets
Optical pumping
Pulse repetition rate
Q switched lasers
Saturable absorbers
High-peak-power sub-nanosecond intracavity KTiOPO4 optical parametric oscillator pumped by a dual-loss modulated laser with acousto-optic modulator and single-walled carbon nanotube
期刊论文
OAI收割
applied physics express, 2016, 卷号: 9, 期号: 8
作者:
Qiao, Junpeng
;
Zhao, Shengzhi
;
Yang, Kejian
;
Zhao, Jia
收藏
  |  
浏览/下载:23/0
  |  
提交时间:2016/10/14
Carbon nanotubes
Light modulators
Locks (fasteners)
Nanotubes
Optical parametric oscillators
Optical pumping
Optically pumped lasers
Photomasks
Pulse repetition rate
Pumping (laser)
Q switched lasers
Saturable absorbers
Single
walled carbon nanotubes (SWCN)
Yarn
Passively mode-locked Nd:YVO4 laser using a single-walled carbon nanotube saturable absorber pumped by880nm laser diode
期刊论文
OAI收割
japanese journal of applied physics, Japanese Journal of Applied Physics, 2011, 2011, 卷号: 50, 50, 期号: 12, 页码: 122703, 122703
作者:
  |  
收藏
  |  
浏览/下载:27/0
  |  
提交时间:2012/06/14
Conversion efficiency
Neodymium
Pulse repetition rate
Pumping(laser)
Single-walled carbon nanotubes(SWCN)
Conversion Efficiency
Neodymium
Pulse Repetition Rate
Pumping(Laser)
Single-walled Carbon Nanotubes(Swcn)
Experiments of second harmonic generation output in pulsed TEA CO 2 laser (EI CONFERENCE)
会议论文
OAI收割
High-Power Lasers and Applications V, October 18, 2010 - October 19, 2010, Beijing, China
作者:
Li D.
收藏
  |  
浏览/下载:57/0
  |  
提交时间:2013/03/25
It is always the hot subject to realize the output of high-power laser in the range of 3-5m wavelength. This rang of wave band has greatly important applications in military because it located in the atmosphere window. Generally there are two ways to obtain this range of laser wavelength. One way is through optical parameter oscillation (OPO) from shorter laser wavelength and the other is through second harmonic generation (SHG) from longer laser wavelength. Firstly
the comparison between tow nonlinear crystals ZnGeP2 and AgGaSe2 is conducted for their nonlinear coefficient and damaging threshold in theory. The theoretical results show that the crystal AgGaSe 2 is more suitable for the SHG of pulsed TEA CO2 laser. When using pulsed TEA CO2 laser with wavelength of 9.3m to pumping AgGaSe2 SHG crystal
the wavelength of 4.65m is obtained. In the condition of repetition rate 100Hz
the upmost output power of single pulse is up to level of 1W
which corresponding efficiency of SHG is about 6%. The experimental results show that the polarization of laser beam has greatly influence on the SHG output of the crystal. Under the radiation of 3MW/cm 2 from fundamental wave and the right position for maximal SHG output in the crystal
when polarization of laser beam rotates 4.5
the SHG output of energy decrease about 30%. The research of this paper will make a foundation for further development of mid-infrared laser. 2010 Copyright SPIE - The International Society for Optical Engineering.
The spectral feature analysis of semiconductor thin disk laser (EI CONFERENCE)
会议论文
OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者:
Li J.
;
Wang L.-J.
;
Wang L.-J.
;
Ning Y.-Q.
;
Li J.
收藏
  |  
浏览/下载:26/0
  |  
提交时间:2013/03/25
The semiconductor thin disk laser is a new type of semiconductor laser. This work gives the basic operation function of semiconductor disk laser
and analyses the heat effect by the experimentally measured photoluminescence spectrum of the laser chip at different pump power and different temperature. We can see that: with increasing pump power
the thermal effects of the gain material becomes seriously and causes the saturation of carrier lifetime
so the electron-hole pair created in the absorbtion layer have no enough time to rate to one of the wells
and the non-radiative recombination happens in the barrier. When the thermal effects becomes stronger
the chip will not lasing. This phenomenon is from the smaller energy offset between barrier and quantum well. We optimize the original structure design and experimental technology. A non-absorbing AlGaAs layer who is transparent to the pumping and laser wavelength is added to confine the carriers in the quantum wells. At the same time a DBR with double reflecting band is induced to improve the absorbing efficiency of the pumping light. The single QW is replaced by the three narrow QWs
This three QWs structure can add the quantum state of QW
increase the recombination probability of carriers in the QWs and reduce the heat effect. The chemical etch equipment is also improved to control the surface unevenness to be within 50 nm.
LD-Pumped all-solid-stated green laser with high polarization rate and high conversion efficiency (EI CONFERENCE)
会议论文
OAI收割
Optoelectronic Materials and Devices for Optical Communications, November 7, 2005 - November 10, 2005, Shanghai, China
Hao E.-J.
;
Tan H.-M.
;
Yan C.-L.
;
Qian L.-S.
收藏
  |  
浏览/下载:24/0
  |  
提交时间:2013/03/25
A high-power-output and high polarization rate Nd:YVO4/ KTP green laser has been presented. By analyzing the factors which affect the conversion efficiency and polarization rate
we used a short folded-cavity resonator
the maximum output power of 320 mW is obtained at 532 nm with the LD pumping power of 1 W
the optical-to-optical conversion efficiency is 32% and the polarization rate is 550:1.
Study on LD-pumped Nd:YAG laser cutter (EI CONFERENCE)
会议论文
OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者:
Zhang G.
;
Zhang G.
;
Zhang G.
;
Zhang J.
;
Zhang J.
收藏
  |  
浏览/下载:25/0
  |  
提交时间:2013/03/25
The theory of laser cutter and the technology neck is analyzed. We can conclude that it is almost impossible to deal with the waste thick silicon wafers which are yielded in producing silicon wafers by conventional eroding or diamond cutting
when the cutting velocity equals 100mm/min
while it is also unperfected with ecumenical laser cutter without good beam quality or precise laseroptics system. It is represented that high average power and high repetition rate laser with good beam quality and precise laseroptics system are pivotal to obtain excellent cutting effect such as thick groove depth
double-layer 0.75mm thick silicon wafer can be penetrated.. The cross section is fine and the groove is narrow
rapid cutting speed
the cutting quality meets the expecting demand.
fine kerf section without considering the effect of technique. Considering laser medium thermal lens effect and thermal focal length changing with pumping power
using plano-convex high reflectivity mirror as the back cavity mirror to compensate the heat lens influence
a /4 waveplate to compensate heat -induced birefraction
utilize the Nd:YAG self- aperture effect
more than 50 W average power 1.064 um IR output is obtained with beam quality factor (M2) equals 3.19. Through the LD-Pumped Nd:YAG laser cutter we developed with short focus length negative spherical aberration focusing lens
double axis linear step motor positioning system
suitable beam expander multiplying factor
appropriate diameter of exit beam aperture
proper repetition rate
when the cutting velocity equals 400mm/min
0.75mm thick silicon wafer can be penetrated