help! mechanical shutter

Reply Mon 28 Aug, 2006 07:53 am
hi friends,

my professor has given few days time to setup and run an expt.(z scan) in optics as part of my project. a part of it involves making a mechanical shutter to limit the pusled output of a laser(from 10 pulses to 2).
i'll be glad if someone can present a creative idea of making a simple mechanical shutter.

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Reply Mon 28 Aug, 2006 12:34 pm
rotating disk with hole(s) in
rotating disk with segment(s) removed
rotating thing with mirror stuck on it

(Unwanted CD, lid of tin can, etc)

Toy type DC motor
variable resistance or variable voltage power supply
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Marco Lazzeri
Reply Tue 29 Aug, 2006 11:41 pm
thats a good idea contrex, thankyou.
but unfortunately,the rotation must be quick and yet slow enough so that the hole reappears only after 1sec : the output should be only 2pulses per sec.this, consequently calls for a large disk and that won't fit snugly in the little space in front of the yag laser.dats why my query was specific to a mechanical 'shutter'.
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Reply Wed 30 Aug, 2006 02:44 pm
Use a solenoid controlled by a 555 timer.
Attach a shutter of opaque material to the throw of the solenoid to block the path of the beam when it is activated.
You can set the 555 timer circuit to perform as you desire so the shutter can be opened and closed in whatever duty cycle is required.
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Reply Wed 30 Aug, 2006 02:49 pm
Of course a Kerr cell would be neat, but kind of hard to rig up quick, and not exactly mechanical. The power supplies are kind of hairy as well. Although I believe modern ones don't need 20 kV square waves to blank them.
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Marco Lazzeri
Reply Fri 1 Sep, 2006 07:08 am
thanks guys
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