Beam switch for small laser table

[housedeejay]

Hi ,I'm building a small laser table and i have a problem with a beam switch I want bo build him on stepper motor 1,8 degrees per step.

http://home.cogeco.ca/~rpaisley4/Stepper.html

I want bo build this driver ,but i want to change "clock"...NE 555 maybe is too slow for 1,8 degrees motor

Is anybody who can show me photos of beam switches ?


Sorry for my weak english
HouseDeeJay