To generate a pure 532nm green laser, there is a BG39 filter in the front of the lasers to block off the infrared (1064nm and 808nm) part. The residual infrared part is less than 0.1%.

Transmisttance T and Internal Transmittance Ti @ d = 1mm
T @ 532nm: >87%;               Ti @ 532nm: 96%
T @ 808nm: <0.002%           Ti @ 808nm: <0.002%
T @ 1064nm: <0.01%           Ti @ 1064nm: <0.01%