optical breakdown

 LASERS AND LASERS EXPERIMENTS


                         Optical Breakdown in air with q-switch Nd:YAG laser
12 MW laser beam focalised in air, produce an spark in air at the focus of the lens.


The Optical Breakdown in air can also be initiated by intense light, i.e. by electromagnetic waves with frequencies of hundreds of terahertz. The high optical intensities required can be reached in pulses as generated  in a Q-switched laser (with nanosecond durations) or in a mode-locked laser . The intensity required for optical breakdown depends on the pulse duration. For example, for 1-ps pulses an optical
intensity of 2.1012× 1013W/cm2 is required.

The effect is a strong local ionization of the medium, where the plasma reaches densities beyond the critical value (between 1020 and 1022 electrons/cm³). Once
 the plasma critical density is achieved energy is very efficiently absorbed from the light pulse, and the local plasma temperature increases dramatically.
An explosive Coulombian expansion follows, and forms
a very powerful and damaging shockwave through the material that develops on ns timescale


http://www.youtube.com/watch?v=wuIXJI2M9oQ
http://www.youtube.com/watch?v=4r1TapmLMrs
http://www.youtube.com/watch?v=R2vihnyUbjI



          

     

  



Claquage diélectrique de l'air avec une lentille de 270 mm de focale en doublage de fréquene à 532 nm!



une application pour les bougies des moteurs thermiques



Puis avec un miroir parabolique de 300 mm de focal à 532nm  puissance instatanée de 12 MW en 10 ns


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