GL-303 Dimensions and Controls. Return to Contents 2. The lid of the GL-303 is hinged to swing back. Open the lid and carefully place the desired filters into their holders. Do not touch the windows of the crystal cell or any of the optics.
Fingerprints can distort the laser beam and adversely affect performance.
Always use appropriate laser safety goggles when operating the frequency doubler. Avoid direct exposure to the beam. Although the GL-303 is a highly sophisticated frequency doubler, it is extremely easy and safe to use. The frequency doubler consists of an optically non-linear crystal mounted in a precisely adjustable angle tuner. For efficient operation, the angle tuner must be adjusted to maximize the output power at each wavelength.