High power Green laser in Seal family series includes 20W narrow pulse width green laser and 30W narrow pulse width green laser. The laser of this series has excellent beam quality (M2 < 1.2) and perfect spot characteristics (cirularity is greater than 90%). The whole machine adopts an integrated structure design, which combines the optical and external driving circuit, making the product series have strong anti-interference ability. Optimize and upgrade the fully sealed structure to effectively prevent the entry of external dust. At the same time, the isolation of external water molecules makes the whole machine have a strong anti-moisture characteristics, making the Seal series adapt to more harsh industrial environments. In addition, the service life can be greatly prolonged by introducing a self-cleaning system for intracavity. The laser of Seal-532-20/30S has very short pulse width (<10ns@90KHZ) and excellent pulse stability (<3% RMS@90KHZ) at medium and high repetition frequencies. The repetition frequency range has been extended (30KHZ~300KHZ), and the efficiency has been greatly improved.