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I Decreasing Laser power

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  1. Jun 2, 2017 #1
    Hi, So I am working with measurements using a laser. What I have noticed is that the power of the laser decreases from the time we start the laser until maybe an hour later.

    Today I noticed it has decreased 10%, from yesterday, which I think sounds like a lot.
    Does the laser have to warm up and become stable Before operation? The laser is a laser diode.
     
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  3. Jun 2, 2017 #2

    f95toli

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    How is the temperature of the diode controlled? I.e,. are you using a "proper" driver or are you just driving it with a normal current source?
    Laser diodes are sensitive to temperature which is why "proper" drive electronics includes a temperature controller.
     
  4. Jun 2, 2017 #3
    Ok I see, that makes sense. I forgot about the temperature sensitivity. As far as I can see it only have a power source and pulse generator. No, there is no 'proper' driver. How would a temperature controller look like? What would it consist of?
     
  5. Jun 2, 2017 #4

    f95toli

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    Commerical versions look like this

    https://www.thorlabs.com/navigation.cfm?guide_id=2107

    However, these will only work if your diode is an a mount which can be used with a temperature controller.

    (btw, I am not an expert in this area; but I do use laser diodes from time to time)
     
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