scholarly journals White-light generation control with crossing beams of femtosecond laser pulses

2016 ◽  
Vol 24 (1) ◽  
pp. 282 ◽  
Author(s):  
A. A. Kolomenskii ◽  
J. Strohaber ◽  
N. Kaya ◽  
G. Kaya ◽  
A. V. Sokolov ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
White Light ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
White Light Generation ◽  
Light Generation ◽  
Generation Control

Experimental study of the effects of femtosecond laser power on the induced-plasma geometry, supercontinuum white light generation and conical emission in air

2020 ◽  
Vol 34 (14) ◽  
pp. 2050152
Author(s):  
A. I. Sanny ◽  
W. M. Edmund Loh
Keyword(s):  
Femtosecond Laser ◽  
White Light ◽  
Laser Power ◽  
Forward Direction ◽  
Geometrical Shape ◽  
Laser Induced Plasma ◽  
Plasma Filament ◽  
White Light Generation ◽  
Conical Emission ◽  
Light Generation

This paper presents the experimental investigation of the changes in the geometrical shape of femtosecond laser-induced plasma in air under different laser power, and its effects on supercontinuum white light generation and conical emission. When a femtosecond laser is focused into a tiny spot in air, optical breakdown of air molecules occurs and this leads to the generation of plasma filament whose geometrical size and shape depend on laser power. This process is then followed by two light-emitting processes, namely supercontinuum white light generation and conical emission, both of which scatter light that reveals the characteristics of the plasma filament. Our experiment shows that the laser-induced plasma becomes thinner and longer at high average laser power but appears thick and round at lower laser power. At higher laser power, conical emission which scatters laser light in the forward direction dominates the scattering process while at lower laser power, it is the scattering of supercontinuum white light in all directions that plays a bigger role. The intricate rainbow-like pattern formed on a white screen located far away in the forward direction reveals sophisticated nonlinear optical processes that take place in conical emission which slowly diminishes as the laser power is gradually reduced.

Blue light generation in photonic crystal f ibers with 1-\mm m femtosecond laser pulses

2011 ◽  
Vol 9 (7) ◽  
pp. 071901-71903 ◽  
Author(s):  
张心贲 Xinben Zhang ◽  
戴能利 Nengli Dai ◽  
彭景刚 Jinggang Peng ◽  
李进延 Jinyan Li
Keyword(s):  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Blue Light ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Light Generation

scholarly journals Self-induced birefringence of white-light continuum generated by interaction of focused femtosecond laser pulses with fused silica

2020 ◽  
Vol 8 ◽  
Author(s):  
J. Qian ◽  
G. D. Wang ◽  
K. Y. Lou ◽  
D. Y. Shen ◽  
Q. Fu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Time Evolution ◽  
White Light ◽  
Laser Energy ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Time Resolved ◽  
White Light Continuum ◽  
Anisotropic Structures

White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed materials. By using two orthogonal polarizers, a self-induced birefringence of continuum is observed when focusing femtosecond laser pulses into bulk fused silica. That is, the generated white-light continuum is synchronously modulated anisotropically while propagating in fused silica. Time-resolved detection confirms that self-induced birefringence of continuum shows a growth and saturation feature with time evolution. By adjusting laser energy, the transmitted intensity of continuum modulated by self-induced birefringence also varies correspondingly. Morphology analysis with time evolution indicates that it is the focused femtosecond laser pulses that induce anisotropic microstructures in bulk fused silica, and the anisotropic structures at the same time modulate the generated continuum.

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