bdring wrote:My power supply is analog or TTL PWM on the "input". I assume it does have a PWM on that circuit. The TTL enable is definitely a digital (on or off) circuit.
r691175002 wrote:The main differentiator here is the speed of the pulses vs the rise time of the laser. Naturally if you are pulsing faster than the rise time the pulses will blend together. I would argue that we are already pulsing faster than the rise time on our chinese tubes so technically we are already grayscale engraving anyways.
r691175002 wrote:My point is that grayscale and dithering are really the same thing.
Consider: All higher end lasers (such as the synrad firestarters) use exclusively digital control. Using a grayscale control program, a 128 gray would be produced by pulsing with a 50% duty cycle. This is identical to the behavior one would see with dithering.
Regardless of what kind of grays you feed into any controller at some point in the process that grey is becomming a series of pulses.
The main differentiator here is the speed of the pulses vs the rise time of the laser.
lasersafe1 wrote:Yes. 1.064um (1064nm) is common, but I thought we were talking about C02, which is 10.6um (10640nm). Exactly 10 times higher and will not transmit through 1um optics. Choppers are an on_off_on_off process. Useless for engraving. The fastest shutters in the business are Uniblitz, but they won't handle power.
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