Patent ID: 6078601
Filing Date: 2000-06-20
Classification: H01S

Abstract:
A method for controlling the operation of a type of laser which provides a digital light output signal in response to receiving a digital electrical input signal which consists of low magnitude portions and high magnitude portions, comprising:adding a time varying signal to said low magnitude portions of said digital electrical input signal;causing a representative ratio of said digital light output signal to be received by a light sensitive component;providing a first electrical monitoring signal from said light sensitive component which is representative of an average value of said digital light output signal over time, said light sensitive component having a frequency response such that said time varying signal portion of said representative ratio of said digital light output signal passes and is represented by said first electrical monitoring signal and the changes of said representative ratio between said high magnitude portions and said low magnitude portions do not pass and are not represented by said first electrical monitoring signal;averaging said first electrical monitoring signal over time to provide a second electrical monitoring signal;multiplying said first electrical monitoring signal by said time varying signal to provide a third electrical monitoring signal;averaging said third electrical monitoring signal over time to provide a fourth electrical monitoring signal; andcontrolling the magnitude of said low magnitude portions of said digital electrical input signal and the differential magnitude between said low magnitude portions and said high magnitude portions of said digital electrical input signal as a function of said second electrical monitoring signal and said fourth electrical monitoring signal.