4W Industry Laser 445nm/447nm/450nm 4000mW Blue Laser Dot Module Diode NDB7A75 w/ TTL0-20kHz & Fan Cooling & Long Time Working: Amazon.com: Industrial & Scientific
445 nm Blue Laser Diode MDL-F-445 — HJ Optronics, Inc.
450nm 2500mW Blue Laser Diode Module Line High Power Laser Focus Adjustable
Blue Laser Modules | Compact Blue Laser Module Solutions