Parametric Study of a Helical TEA CO2 Laser

1973 ◽  
Vol 51 (16) ◽  
pp. 1705-1708 ◽  
Author(s):  
A. Girard ◽  
H. Pépin ◽  
J. G. Vallée
Keyword(s):  
Laser Pulse ◽  
Parametric Study ◽  
Pulse Shape ◽  
Peak Power ◽  
Output Pulse ◽  
Tea Co2 Laser ◽  
Gas Composition ◽  
Output Pulse Energy ◽  
Power Pulse ◽  
Energy Peak

We present results of a parametric study of a helical TEA CO2 laser. The output pulse energy, peak power, pulse shape, and beam divergence have been studied as functions of the capacitance, charging voltage, and gas composition. At 50 kV, with a capacitor of 0.01 μF for each element, we have obtained 3.5 MW output in a 100 ns laser pulse. This study will be of interest to those wishing to use such a device.

Study on Laser Welding of Phone Nuts

2013 ◽  
Vol 815 ◽  
pp. 778-781
Author(s):  
Xiao Hong Wu
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Laser Pulse ◽  
Laser Welding ◽  
Pulse Energy ◽  
Pulse Width ◽  
Peak Power ◽  
Laser Pulse Energy ◽  
304 Stainless Steel ◽  
Power Pulse

Used YAG pulse laser to weld 304 stainless steel nuts, studied about the parameters such as peak power, pulse width, defocus distance impacting on the performance of the joints welded by laser. The studies showed that the tensile strength and torque of the nuts increased as the peak power and the pulse width increased.Burn through in welding easy occur when laser pulse energy is too big, pulse width is too wide or defocus distance is too low.

scholarly journals Tunable, high peak power terahertz radiation from optical rectification of a short modulated laser pulse

2006 ◽  
Vol 14 (15) ◽  
pp. 6813 ◽  
Author(s):  
Daniel F. Gordon ◽  
Antonio Ting ◽  
Ilya Alexeev ◽  
Richard Fischer ◽  
Phillip Sprangle ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Terahertz Radiation ◽  
Peak Power ◽  
High Peak ◽  
Optical Rectification ◽  
High Peak Power

Parametric Analysis of Laser Beam Percussion Drilling for Thin Titanium Alloy Sheet Using Yb: Yag Fiber Laser

2021 ◽  
pp. 1-24
Author(s):  
Mohit Singh ◽  
Sanjay Mishra ◽  
Vinod Yadava ◽  
J. Ramkumar
Keyword(s):  
Laser Beam ◽  
Fiber Laser ◽  
Pulse Width ◽  
Peak Power ◽  
Laser Pulses ◽  
Pulse Frequency ◽  
Alloy Sheet ◽  
Power Pulse ◽  
The Individual ◽  
Percussion Drilling

Laser beam percussion drilling (LBPD) can create high density holes in aerospace materials with the repeated application of laser pulses at a single spot. In this study, one-parameter-at-a-time approach has been used to investigate the individual effect of peak power, pulse width and pulse frequency on geometrical accuracy and metallurgical distortion during LBPD of 0.85[Formula: see text]mm thick Ti–6Al–4V sheet using 200[Formula: see text]W Yb:YAG fiber laser. It has been found that the output parameters behave differently at the higher and lower values of a particular input process. The increase of pulse width from 1 to 1.50[Formula: see text]ms increases hole taper by 20% whereas the same corresponding change from 1.50 to 2.00[Formula: see text]ms reduces the taper by 20%. The increase of pulse frequency from 10 to 50[Formula: see text]Hz reduces hole circularity by 40% but the same proportionate change from 50 to 90[Formula: see text]Hz reduces circularity by 79%. Increase of peak power from 1.70 to 2.0[Formula: see text]kW increases hole taper by 8% but the corresponding increase from 2 to 2.30[Formula: see text]kW is 143%.

Influence of laser pulse shape on surface temperature of Si-target

2010 ◽  
Vol 22 (8) ◽  
pp. 1843-1846
Author(s):  
王世俊 Wang Shijun ◽  
王英龙 Wang Yinglong ◽  
丁学成 Ding Xuecheng ◽  
梁伟华 Liang Weihua ◽  
邓泽超 Deng Zechao ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Surface Temperature ◽  
Pulse Shape ◽  
Laser Pulse Shape

scholarly journals Drop deformation by laser-pulse impact

2016 ◽  
Vol 794 ◽  
pp. 676-699 ◽  
Author(s):  
Hanneke Gelderblom ◽  
Henri Lhuissier ◽  
Alexander L. Klein ◽  
Wilco Bouwhuis ◽  
Detlef Lohse ◽  
...  
Keyword(s):  
Surface Tension ◽  
Laser Pulse ◽  
Time Scale ◽  
Pulse Shape ◽  
Thin Sheet ◽  
Boundary Integral ◽  
Drop Deformation ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Energy Partition

A free falling, absorbing liquid drop hit by a nanosecond laser pulse experiences a strong recoil pressure kick. As a consequence, the drop propels forward and deforms into a thin sheet which eventually fragments. We study how the drop deformation depends on the pulse shape and drop properties. We first derive the velocity field inside the drop on the time scale of the pressure pulse, when the drop is still spherical. This yields the kinetic energy partition inside the drop, which precisely measures the deformation rate with respect to the propulsion rate, before surface tension comes into play. On the time scale where surface tension is important, the drop has evolved into a thin sheet. Its expansion dynamics is described with a slender-slope model, which uses the impulsive energy partition as an initial condition. Completed with boundary integral simulations, this two-stage model explains the entire drop dynamics and its dependence on the pulse shape: for a given propulsion, a tightly focused pulse results in a thin curved sheet which maximizes the lateral expansion, while a uniform illumination yields a smaller expansion but a flat symmetric sheet, in good agreement with experimental observations.

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