According to one embodiment of the present invention, a programmable light
source comprises one or more semiconductor lasers, a wavelength
conversion device, and a laser controller. The controller is programmed
to operate the semiconductor laser using a modulated feedback control
signal. The wavelength control signal is adjusted based on the results of
a comparison of a detected intensity signal with a feedback signal to
align the lasing wavelength with the conversion efficiency peak of the
wavelength conversion device. Laser controllers and projections systems
operating according to the control concepts of the present invention are
also provided.