[Laser] simple laser modulator

[email protected] [email protected]
Mon, 16 Sep 2002 14:22:52 +0300


Hi all ! Have anyone done or thought modulator like this ? It just came to my mind some day...



                (focal point, modulation)

           .   ()  .         .  () . 
       .       ()     .  .      ()    .  
LASER>� . . . .().......*........()....... (focal point, to transmit optics)
       .       ()     . ^   .    ()    .  
           .   ()  .    I      . () .
                        I
                        I
                        I
                 (Piezo or speaker)

Litlle explanation, if you didn't realise yet ;)

Idea is to have needle just at focus point, or some else "beam cutter". If using loudspeaker, you can easily set it to 50% light troughput by biasing ls.
By focusing beam, only litlle movement is needed to obtain 100 % modulation,
so propably high frequency bandwidth might be possible. If using very light (eg. litlle mass) needle, it should also improve bw.

Well, comments, guys !

73, Marko
OH6JSC