scholarly journals Short (~ ns) single pulse FIR (70-500 µm) multi-kW Raman conversion, of a short pulse (~ 25ns) broadband CO2 Laser

1994 ◽  
Vol 04 (C4) ◽  
pp. C4-747-C4-749
Author(s):  
S. MARCHETTI ◽  
S. BARTALINI ◽  
R. SIMILI ◽  
M. MARTINELLI
Keyword(s):  
Co2 Laser ◽  
Short Pulse ◽  
Single Pulse ◽  
Raman Conversion

scholarly journals Toward little heat-affected area of fused silica materials using short pulse and high power CO2 laser

2019 ◽  
Vol 12 ◽  
pp. 1363-1371 ◽  
Author(s):  
Linjie Zhao ◽  
Jian Cheng ◽  
Mingjun Chen ◽  
Xiaodong Yuan ◽  
Wei Liao ◽  
...  
Keyword(s):  
Co2 Laser ◽  
High Power ◽  
Short Pulse ◽  
Fused Silica ◽  
Affected Area ◽  
Silica Materials

Surface melting of Al–Cu–Mg alloy using a short-pulse, planar waveguide CO2 laser for corrosion resistance improvement

2003 ◽  
Vol 15 (4) ◽  
pp. 233-239 ◽  
Author(s):  
M. G. Tsagkarakis ◽  
F. J. Villarreal ◽  
H. J. Baker ◽  
D. R. Hall ◽  
S. W. Williams
Keyword(s):  
Corrosion Resistance ◽  
Co2 Laser ◽  
Planar Waveguide ◽  
Short Pulse ◽  
Surface Melting ◽  
Mg Alloy ◽  
Resistance Improvement

Dual Pump Femtosecond Laser Induced Plasma

2008 ◽  
Author(s):  
Meg Mahat ◽  
Tae Y. Choi ◽  
Nasrasadani Seifolah ◽  
Arup Neogi
Keyword(s):  
Emission Intensity ◽  
Short Pulse ◽  
Single Pulse ◽  
Atomic Emission ◽  
Dielectric Materials ◽  
Pulse Excitation ◽  
Time Resolved ◽  
Breakdown Spectroscopy ◽  
Short Pulse Laser ◽  
Ultra Short Pulse

Laser-induced breakdown spectroscopy (LIBS) can provide a noncontact way of inspecting a specimen including distinct signature of atomic composition of the sample. Ultra-short pulse laser enables characterization of any materials by utilizing the multiphoton process, which is a dominant carrier generation mechanism for dielectric materials. Additionally, femtosecond LIBS yields low background and better defined atomic lines than the nanosecond LIBS. We have performed a time-resolved emission intensity measurement for an iron oxide (Fe3O4, magnetite). The emission intensity has the peak value at 100 ps time delay, signifying that the succeeding pump beam is interacting with the plasma generated in the vicinity of the sample by the preceding beam. The dual pulses significantly enhance the atomic emission as compared to single pulse excitation and enables ultrafast time-resolved spectroscopy.

scholarly journals Flexible Hollow Light Guide for Higher Peak Short Pulse CO2 Laser

1987 ◽  
Vol 8 (3) ◽  
pp. 179-180
Author(s):  
Yuichi HASHISHIN ◽  
Uichi KUBO
Keyword(s):  
Co2 Laser ◽  
Light Guide ◽  
Short Pulse

scholarly journals A Method to Produce Short Pulse on a VHF-Plasma Excitation Slab-Type CO2 Laser.

2001 ◽  
Vol 29 (4) ◽  
pp. 251-255 ◽  
Author(s):  
Akira MORI ◽  
Yoshinobu HASHINISHI ◽  
Kaoru SUZUKI ◽  
Junji NAKATA
Keyword(s):  
Co2 Laser ◽  
Short Pulse ◽  
Plasma Excitation

Disynaptic Inhibition of Omnipause Neurons Following Electrical Stimulation of the Superior Colliculus in Alert Cats

2001 ◽  
Vol 85 (6) ◽  
pp. 2639-2642 ◽  
Author(s):  
Kaoru Yoshida ◽  
Yoshiki Iwamoto ◽  
Sohei Chimoto ◽  
Hiroshi Shimazu
Keyword(s):  
Superior Colliculus ◽  
Short Pulse ◽  
Single Pulse ◽  
Synaptic Organization ◽  
Postsynaptic Potentials ◽  
Disynaptic Inhibition ◽  
Alert Cats ◽  
Omnipause Neurons ◽  
Pulse Stimulation ◽  
Stimulation Of

We investigated the synaptic organization responsible for the inhibition of omnipause neurons (OPNs) following stimulation of the superior colliculus (SC) in alert cats. Stimulation electrodes were implanted bilaterally in the rostral and caudal SC where a short-pulse train induced small and large saccades, respectively. Effects of single-pulse stimulation on OPNs were examined with intracellular and extracellular recordings. In contrast to monosynaptic excitatory postsynaptic potentials, which were induced by rostral SC stimulation, inhibitory postsynaptic potentials were induced with disynaptic latencies (1.3–1.9 ms) from both the rostral and caudal SC in most OPNs. Analysis of a larger extracellular sample complemented intracellular observations. Monosynaptic activation of OPNs was elicited more frequently from rostral sites than from caudal sites, whereas spike suppression with disynaptic latencies was induced by caudal as well as rostral stimulation with similar frequencies. The results imply that disynaptic inhibition is produced by activation of SC cells that are distributed over wide regions related to saccades of different sizes. We suggest that signals from these neurons initiate a saccadic pause of OPNs through single inhibitory interneurons.

scholarly journals Step-Pulse Modulation of Gain-Switched Semiconductor Pulsed Laser

2019 ◽  
Vol 9 (3) ◽  
pp. 602 ◽  
Author(s):  
Bin Li ◽  
Changyan Sun ◽  
Yun Ling ◽  
Heng Zhou ◽  
Kun Qiu
Keyword(s):  
Semiconductor Laser ◽  
Peak Power ◽  
Short Pulse ◽  
Extinction Ratio ◽  
Pulse Signal ◽  
Single Pulse ◽  
Single Mode ◽  
Output Pulse ◽  
Time Domain Reflectometry ◽  
Pulse Modulation

To improve the peak power and extinction ratio and produce ultra-short pulses, a novel approach is presented in this paper offers a highly effective modulated method for a gain-switched semiconductor laser by using step-pulse signal modulation. For the purpose of single pulse output, then the effects on the output from the gain-switched semiconductor laser are studied by simulating single mode rate equation when changing the amplitude and width of the modulated signal. The results show that the proposed method can effectively accelerate the accumulation speed of the population inversion and we can acquire the output pulse with higher peak power and shorter width. Compared with the traditional rectangular wave modulation, this method is advantageous to obtain a high gain switching effect by increasing the second modulation current and reduce the pulse width to saturation at the best working point. It can be incorporated as a practical and cost-effective approach for many fields which need high extinction ratio short pulse, such as the optical time domain reflectometry.

scholarly journals Short-pulse CO2 laser systems for plasma investigation at the IPPLM

1985 ◽  
Author(s):  
J. BADZIAK ◽  
M. BORZEGKI ◽  
A. CHOJNACKA ◽  
Z. DZWIGALSKI ◽  
R. JAROCKI ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Short Pulse ◽  
Laser Systems ◽  
Plasma Investigation

Longitudinally excited short-pulse CO2 laser with large discharge tube without preionization

2022 ◽  
Vol 148 ◽  
pp. 107745
Author(s):  
Kazuyuki Uno ◽  
Shohei Watarai ◽  
Yasushi Kodama ◽  
Kazuyuki Yoneya ◽  
Takahisa Jitsuno
Keyword(s):  
Co2 Laser ◽  
Discharge Tube ◽  
Short Pulse ◽  
Large Discharge
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