Kinematics of multiphoton ionization in a steady laser beam

1984 ◽  
Vol 29 (4) ◽  
pp. 2245-2247 ◽  
Author(s):  
Marvin H. Mittleman
Keyword(s):  
Laser Beam ◽  
Multiphoton Ionization

Multiphoton ionization in atomic gases with depletion of neutral atoms

1970 ◽  
Vol 48 (12) ◽  
pp. 1445-1447 ◽  
Author(s):  
S. L. Chin ◽  
N. R. Isenor
Keyword(s):  
Experimental Data ◽  
Laser Beam ◽  
Multiphoton Ionization ◽  
Expected Value ◽  
Atomic Gases ◽  
Neutral Atoms

An expression for the number of ions formed by multiphoton ionization of atoms at the focus of a Q-switched laser beam is derived assuming a rate given by existing perturbation treatments. Depletion of neutral atoms has the effect of indicating a lower than expected value for the number of photons absorbed. It is concluded that discrepancies between existing experimental data and perturbation results could be accounted for by such depletion.

Laser beam waist determination by means of multiphoton ionization

1975 ◽  
Vol 46 (3) ◽  
pp. 332-333 ◽  
Author(s):  
E. H. A. Granneman ◽  
M. J. van der Wiel
Keyword(s):  
Laser Beam ◽  
Multiphoton Ionization ◽  
Beam Waist

scholarly journals Surface related laser induced white emission of Cr:YAG ceramic

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Chaika ◽  
R. Tomala ◽  
W. Strek
Keyword(s):  
Laser Beam ◽  
White Light ◽  
Light Emission ◽  
Multiphoton Ionization ◽  
White Light Emission ◽  
Photon Absorption ◽  
Outer Side ◽  
Two Photon Absorption ◽  
Ceramic Pellet ◽  
Intervalence Charge Transfer

AbstractIn this work we report the white light emission in transparent Cr:YAG ceramic pellet upon irradiation with focused beam of CW infrared laser diode. It was found that this phenomenon is specifically related to interaction of laser beam with a surface of the pellet. The white light was emitted outside an irradiated spot at the surface of the pellet and did not penetrate inside the pellet. Moreover, the red emission related to two-photon absorption along the laser beam penetrating the Cr3+:YAG pellet was observed. Interaction of the laser beam with the surface of the pellet leads to an efficient white light emission from an outer side of the pellet. The resulting white light emission did not entry back the pellet. Multiphoton ionization leading to intervalence charge transfer followed by light emission was proposed as the mechanism of experimentally observed white light emission.

Two-photon excitation microscopy in cellular biophysics

1995 ◽  
Vol 53 ◽  
pp. 62-63
Author(s):  
David W. Piston ◽  
Brian D. Bennett ◽  
Robert G. Summers
Keyword(s):  
Confocal Microscopy ◽  
Laser Beam ◽  
Duty Cycle ◽  
Excited Electronic State ◽  
Input Power ◽  
Two Photon ◽  
Simultaneous Absorption ◽  
Photon Excitation ◽  
Very High ◽  
Two Photon Excitation

Two-photon excitation microscopy (TPEM) provides attractive advantages over confocal microscopy for three-dimensionally resolved fluorescence imaging and photochemistry. Two-photon excitation arises from the simultaneous absorption of two photons in a single quantitized event whose probability is proportional to the square of the instantaneous intensity. For example, two red photons can cause the transition to an excited electronic state normally reached by absorption in the ultraviolet. In practice, two-photon excitation is made possible by the very high local instantaneous intensity provided by a combination of diffraction-limited focusing of a single laser beam in the microscope and the temporal concentration of 100 femtosecond pulses generated by a mode-locked laser. Resultant peak excitation intensities are 106 times greater than the CW intensities used in confocal microscopy, but the pulse duty cycle of 10-5 maintains the average input power on the order of 10 mW, only slightly greater than the power normally used in confocal microscopy.

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