During their jury trial, the court was told the pair took turns pointing the laser at the police Eagle helicopter about 11pm on May 7, 2011, while they were at an 18th birthday party in Auckland's Mt Albert.
Crown prosecutor Asishna Prasad said at the time their actions had put the three-man crew in danger.
"The crew of a helicopter can't afford to be distracted when they are airborne because their ability to carry out their duties is compromised. They would have been unable to identify hazards in that airborn environment," she said.
One crew member, Sergeant Al Grant, told the court the laser had impaired his vision.
"For a few seconds it filled the cockpit of the aircraft with a strong green light."
The crew pinpointed the house where the laser came from and police on the ground arrested the pair.
