Is the laser diode driver circuit correct?

Question

Electronics

I'm building a laser engraver. A 1000mW laser module came from China, but it does not have a TTL input. Accordingly, it is impossible to flash the laser. You have to make your own driver. I plugged a transistor into a popular circuit. Please describe the shortcomings and unworthiness of this scheme, and will it work at all?

Answer 1

it has no TTL input

I will surprise you, but there is no TTL input in lasers. When they talk about this very input, they mean the control board, not the laser.

you can't flash the laser

Why? Make a PWM controller and "shim" to your health.

Please describe the shortcomings and unworthiness of this scheme, and will it work at all?

Purely theoretically, the circuit should work; in practice, you need to know the parameters of the laser. In general, the scheme is bullshit. You need a PWM current regulator, not a field valve with an air gate

Answer 2

if irf in this state opens / closes (breaking google parameters) then it will work.

Answer 3

1.25 V will drop across R1. A minimum of 2 V should fall on the LM317. How much the LED will remain and whether there will be anything on the exhaust is a task for the entrant. evgeniy_lm is 145% right.
PS Is there an output of a control photodiode for closing the OOS in terms of power?