an electronic device with a purple light on top of it

It is a 440nm blue semiconductor laser with adjustable power supply, the output power can be adjusted from 0~ 4000mW by adjusting the current. There are three modes to choose from CW, TTL modulation and analog modulation. The Power stability is 0.04%. Let's check it now. https://www.civillaser.com/index.php?main_page=product_info&products_id=387