Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Combining two DC voltages for laser locking

  1. Mar 16, 2017 #1
    I need to combine two DC voltages to scan and lock a laser. The scanning will be 0-100 V and the locking will be performed with a small correcting voltage, +/- 1 V. Both of these will be fed into a PZT driver. My advisor suggested using an opto isolator, however I am not sure how that would work unless there are opto isolators that exist with two LEDs and one detector. Also, I am unsure how that would work with the negative voltages. Any help would be really appreciated, as a chemist I only have a general physics knowledge of electronics.
     
  2. jcsd
  3. Mar 16, 2017 #2

    berkeman

    User Avatar

    Staff: Mentor

    Welcome to the PF.

    Can you post more about the setup? What is the source of the 0-100V? What is the source of the +/- 1V? What is the input impedance of the PZT driver?

    If your 0-100V source can be offset by driving its negative terminal, that might be the easiest way to do this...Like when you offset the black terminal on the power supply below (don't connect it directly to Earth Ground):

    https://images-na.ssl-images-amazon.com/images/I/514hEOQXZAL._SX342_.jpg
    514hEOQXZAL._SX342_.jpg
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Combining two DC voltages for laser locking
Loading...