Generation of an air laser at extended distances by femtosecond laser filamentation with telescope optics.
Opt Express
; 22(3): 3151-6, 2014 Feb 10.
Article
in En
| MEDLINE
| ID: mdl-24663606
ABSTRACT
We present the generation of self-induced-white-light-seeded lasing action of nitrogen molecules in air by a Tisapphire femtosecond laser (800 nm, 5.5 mJ) and demonstrate that such lasing action is strongly influenced by external focusing conditions. It is found that the self-seeded lasing signal of N(2)(+) at ~391 nm decreases dramatically by orders of magnitude and ultimately disappears when the focal length of an external lens increases from 0.5 m to 1 m. By using a telescope, it is shown that such limitation can be overcome and the 391 nm lasing can be controlled to occur at remotely designated distance, providing a possibility for practical applications in standoff spectroscopy.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Opt Express
Journal subject:
OFTALMOLOGIA
Year:
2014
Document type:
Article