Mode-locking observation of a CO2 laser by intracavity plasma injection

1980 ◽  
Vol 58 (6) ◽  
pp. 840-844 ◽  
Author(s):  
P. K. John ◽  
M. Dembinski
Keyword(s):  
Refractive Index ◽  
Shock Tube ◽  
Plasma Density ◽  
Co2 Laser ◽  
Mode Locking ◽  
Time Dependent ◽  
Electromagnetic Shock ◽  
Plasma Injection ◽  
Phase Perturbation ◽  
Underdense Plasma

A TEA CO2 laser was simultaneously Q-switched and mode-locked when an underdense plasma was injected into the cavity. The plasma was produced in an electromagnetic shock tube. Plasma density and temperature were Ne ~ 1017 cm−3 and Te ~ 2 eV, respectively. Phase perturbation of the cavity due to the time dependent plasma refractive index could account for the observed mode-locking.

scholarly journals Demonstration of laser pulse amplification by stimulated Brillouin scattering

2014 ◽  
Vol 2 ◽  
Author(s):  
E. Guillaume ◽  
K. Humphrey ◽  
H. Nakamura ◽  
R. M. G. M. Trines ◽  
R. Heathcote ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Plasma Density ◽  
Brillouin Scattering ◽  
Laser System ◽  
Laser Pulses ◽  
Seed Pulse ◽  
Central Wavelength ◽  
Demonstration Experiment ◽  
Stimulated Brillouin ◽  
Underdense Plasma

Abstract The energy transfer by stimulated Brillouin backscatter from a long pump pulse (15 ps) to a short seed pulse (1 ps) has been investigated in a proof-of-principle demonstration experiment. The two pulses were both amplified in different beamlines of a Nd:glass laser system, had a central wavelength of 1054 nm and a spectral bandwidth of 2 nm, and crossed each other in an underdense plasma in a counter-propagating geometry, off-set by $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}10^\circ $ . It is shown that the energy transfer and the wavelength of the generated Brillouin peak depend on the plasma density, the intensity of the laser pulses, and the competition between two-plasmon decay and stimulated Raman scatter instabilities. The highest obtained energy transfer from pump to probe pulse is 2.5%, at a plasma density of $0.17 n_{cr}$ , and this energy transfer increases significantly with plasma density. Therefore, our results suggest that much higher efficiencies can be obtained when higher densities (above $0.25 n_{cr}$ ) are used.

Injection mode-locking of a 200 joule TEA-CO2 laser

1978 ◽  
Vol 26 (2) ◽  
pp. 256-260 ◽  
Author(s):  
P.-A. Bélanger ◽  
R. Tremblay ◽  
P. Lapierre
Keyword(s):  
Co2 Laser ◽  
Mode Locking ◽  
Tea Co2 Laser ◽  
Injection Mode

Optical excitation waves in a molecular crystal

1964 ◽  
Vol 282 (1390) ◽  
pp. 433-445 ◽  
Keyword(s):  
Refractive Index ◽  
Quantum Theory ◽  
Excited States ◽  
Molecular Crystal ◽  
Optical Excitation ◽  
Time Dependent ◽  
Hartree Approximation ◽  
Quasi Particle ◽  
Quantum Theory Of Radiation ◽  
Classical Picture

We have used the quantum theory of radiation, within the time-dependent Hartree approximation, to study exciton states of a van der Waals molecular crystal. The radiation variables are eliminated to give a semi-classical picture of molecular dipoles interacting through a retarded potential, and the solutions of the Hartree equations are closely connected with the quasi-particle excited states in Agranovich’s theory. In the Lorentz-Lorenz approximation the crystal has excited states which correspond to both longitudinal and transverse exciton weaves, and the refractive index behaves classically. The paper concludes with a brief discussion of metallic reflexion by dye crystals.

Reflected wave reverse flow in an electromagnetic shock tube

AIAA Journal ◽  
1970 ◽  
Vol 8 (5) ◽  
pp. 947-948
Author(s):  
DAVID S. SCOTT ◽  
THOMAS P. ANDERSON
Keyword(s):  
Shock Tube ◽  
Reverse Flow ◽  
Reflected Wave ◽  
Electromagnetic Shock
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