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cc cv laser driver

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quadzillatech:
Hi all,im building a 2 watt laser engraver for my cnc mill,its a 450nm laser diode,max voltage is  4.8v and it needs 1400ma ,im planing on using one 317 as a voltage regulator feeding a 2nd 317 as a current regulator,any reason why it shouldnt work,also as the 317 ref voltage is 1.25v i assume the first 317 will have to output 6.25v to the 2nd 317,im i right in thinking that?,also it can handle 1800ma puled,i againe assume it means pwn the power to it,if so any idea what frequency it should be,the diode is a nichia m-140,thanks in advance Paul m3-vuv.

unitedatoms:
You can test the voltages, currents regulation in LTSpice, replace laser diode with resistor. So the calculations will prove correct for constant output. However the constant work mode will overheat the laser.

May be in engraving it is more advantageous to create impacts by peak power rather than average power.

It looks that people use high pulsing frequencies, higher than LM317 will handle.
For PWM you may want to go several kHz with energy say of 0.1 milliJoules of output energy per pulse. Say 10KHz will average at 1W. Also the PWM needs to be constant width, due to energy per pulse, and frequency to be fixed or variable.

So practical engraving circuit turns complicated quickly.

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