AK390HT Laser Hardening HeadPower rating 20KW; Laser hardening by rectangular beam spot; Parabolic optics system. Adapts direct water-cooled parabolic copper mirror to support high power with a long lifespan. Dual water circuits design to prolong lifespan of head. A variety of fiber interfaces like QBH, QD (LLK-D) or LLK-B. With a special integrated mirror to conduct rectangular beam spot for hardening. Different integrated mirrors in size for option to achieve a variety of beam spot size.