Type mechanical with electronic control. Can also be controlled by a micro controller.
Open time 1.5 second, .3 second over the beam waist.
Cost $ 30 excluding the power supply.
Operational voltage 3.3, 5 and 12 volts.
Laser intensity upto 10 W.
There might be many ways to make a mechanical shutter; I used eclipsing technique in which a shutter moves over and across an aperture through which the beam passes. To move the shutter I used an electric motor and a gear box. This method is relatively hard because of the motor timing (build all the electronics is not easy). While working on this I got couple of ideas of achieving the same goal in 1/10 of the work and time: A 6 inches audio speaker with/without a micro controller can be converted in to a shutter (I will use this method if I plan to make a shutter for He-Ne) OR simply an electromagnet with a cantilever can be used as a shutter. The advantages of such a systems are, easy to make and similar in speed to commercially available systems.
Step 1: Components
The components used:
Glade automatic air spray: Air spray uses a motor and gearbox to mechanically operate the spray bottle, which i used to move shutter.
Thorlab Cage System Removable Filter Holders CFH1: To make shutter holder and shutter.
Two 3 inches cage assembly rods: To install the shutter holder on the skin of air spray.
Black aluminum foil: To make the shutter.
2 3-pole on/off switch
1 Push on/off button
2 CD4013 4013 IC CMOS DUAL D FLIP FLOP IC
1 Resistor 100K Ohm
2 Resistor 10K Ohm
1 Resistor 100 Ohm trimmer (pot)
1 Resistor 1.5k Ohm
3 Resistor 240 Ohm
1 1N4148 diode
1 0.1uF 50V Ceramic Capacitor
1 222uF Radial Electrolytic Capacitor
1 npn KD-7B C1815 Y transistor
2 14 pin DIP IC Socket Adaptor Solder Type
2 RED LED 3mm
1 Yellow LED 3mm
1 A-5032 Prototyping Board 300x400 mm
1 12V relay
1.5m red, black, green and yellow wires
1 6X8 cm aluminum box.
3 Banana connectors M&F (yellow (+12V), red (+5V) and orange (+3.3V))
1 Powe Jack M&F
I used 300W desktop computer power supply which i salvaged from an old computer.