RE: SL Lasers

Carrigan, Ken ( (no email) )
Mon, 27 Mar 2000 09:39:12 -0500

In response below:
A 'quasi' feedback system was used to find the resonance of the
flask, and surprisingly the optimum resonance gave a distorted
sinewave on the oscope. Very strange since the sinewave going
into both transducers is pure and identical. Must have something
to do with phasing I guess. Anyway, the amplitude of the signal
has to be JUST right to obtain sonoluminescence and give this
distorted waveform. Applying more energy to the ultrasonic
signal will shrink the bubble to destruction and vanish it totally.
This is why it is so darn hard to get the bubble to 'luminesce'
cause it is hard to 'tweak' the sig gen level right at the bubble
stability point and no further or poof.. the bubble vanishes and
have to start over.

v/r Ken Carrigan

>The question I propose, is if one were to use a
>constructive feedback system to feed the bubble with
>the appropriate ultrasonic wave, would it tend towards
>the resonance, and reach an equilibrium that would
>keep the bubble alive, or would it only further its
>destruction?
>
>There's no way to guarantee that my ideas are sound,
>let alone adequate for any review; it's just that this
>idea kind of struck me, and since there was no one
>else I knew who would really be interested let alone
>educated in such an area, I thought those with and for
>KeelyNet may.

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