dirktheeng wrote:Do you mean "I assume it does have a rc filter on that circuit" in the second sentance? If so, that makes sense from what we have talked about before. My power supply lets you switch to use a pot or the PWM but not both at the same time. The only way it could do that effectively is to use an rc ciruit. That said, the on/off is definately a digital gate signal.
dirktheeng wrote:A PWM signal control like that makes the laser SLOWER to respond than it already is unless you have some kind of feedback method and a very fast PID controller.
lasersafe1 wrote:Where in the world are you reading this or learning this? I personally think you are way off base. Just as you can control the power of a radio broadcast, you can instantly change the RF power to a laser tube. All within one wave of the RF frequency.
synrad page 3-7 wrote:Firestar lasers cannot be controlled by analog or current signals
lasersafe1 wrote:Call me Dream Smasher. While you might spin a chopping wheel at a high rate, momentum will prevent you from changing that rate at any significant rate. Also, just for fun, calculate the wheel diameter that would be required to have a slit opening edge give you a 100us rise time. I think you'll be surprised.
i'm playing around with the idea of making them from 72,000 rpm hard drives
r691175002 wrote:http://www.synrad.com/Manuals/v40_v3.1.pdf
Look at page 3-6 and you will see that rf lasers are only on or off. There is no grayscale on the synrad firestar lasers. In fact, the recommend PWM frequency is only 5KHz.synrad page 3-7 wrote:Firestar lasers cannot be controlled by analog or current signals
lasersafe1 wrote:There are no acousto optic or electro optic devices for 10.6um.
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