Two laser wavelength Thomson Scattering for high electron
... temperature and –density measurements. Most of the TS systems are realized with pulsed, high power Nd:YAG lasers as light source with a wavelength at λ=1064 nm, together with interference filter polychromators for spectral analysis of the scattered light in the near infrared region (typically betwee ...
... temperature and –density measurements. Most of the TS systems are realized with pulsed, high power Nd:YAG lasers as light source with a wavelength at λ=1064 nm, together with interference filter polychromators for spectral analysis of the scattered light in the near infrared region (typically betwee ...
The excitation mechanism excitation mechanism
... with the gas molecules and transfer energy to them. Thus, the gas molecules are raised to excited state. Higher voltage is required to start the electrical discharge in the tube than to keep the discharge. Thus, a preliminary high voltage pulse is applied for initial discharge, and then the voltage ...
... with the gas molecules and transfer energy to them. Thus, the gas molecules are raised to excited state. Higher voltage is required to start the electrical discharge in the tube than to keep the discharge. Thus, a preliminary high voltage pulse is applied for initial discharge, and then the voltage ...
Some quantum properties of light
... Real laser: pumping process typically something like E3 Pump State ...
... Real laser: pumping process typically something like E3 Pump State ...
Document
... lasers contain an amplifying medium, located in a cavity between two mirrors, that can increase the intensity of light beam passing through it. This increased intensity will give additional energy into the beam itself. ...
... lasers contain an amplifying medium, located in a cavity between two mirrors, that can increase the intensity of light beam passing through it. This increased intensity will give additional energy into the beam itself. ...
Laser pumping
Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier. The pump power must be higher than the lasing threshold of the laser.The pump energy is usually provided in the form of light or electric current, but more exotic sources have been used, such as chemical or nuclear reactions.