[Laser] Wicked Lasers Fusion (125mW 532nm) Modulation

[Charles Pooley]

Art <KY1K[at]verizon.net> wrote:
   
It's all about the temperature of the IR diode that drive the optical 
doubler crystal. If you attach a temperature sensor to the IR laser, 
you will find that the output peaks when the temperature of that 
diode reaches a certain temperature. That's because the output 
frequency of the IR laser diode varies with temperature.
  ---------------------------------------
   
  The LD junction temp can be sensed by periodically turning the LD
 current down to a small reading current, say 1/10 of threshold, or 10 mA
 or so, then measuring the forward voltage.  This works well for LEDs and
 though I haven't tried it for lasers, I would think that it would for
 lasers.
   
  Do you know the risetime of the doubler crystal?  Is it as quick as
 the exciter LD (which should be < 1 ns)?
   
  Then, after measuring or calculating the thermal mass of the
 junction, a modulating scheme which maintains a constant junction temp should
 be possible.
   
      Charles Pooley            KD6HKU
    ckpooley[at]sbcglobal.net
    microlaunchers[dot]com    (for some reason reply bounced with URL in it)