Just bought one of these

https://www.amazon.co.uk/1-3KHZ-Volt...6541965&sr=8-5

- looks simple conversion. But I'd hope for PWM control or TTL as its more accurate for shading etc. But.. saying that - I might buy another laser just for etching as I bought the 30w mainly for cutting hopefully it can achieve that. Apparently u get better focus and accuracy at lower power with diodes