Patent ID: 9680280
Date: 2017-06-13
CPC Classifications: H01S

Claim:
1. A high power fiber amplifier system comprising: a passively mode locked oscillator generating optical pulses at a repetition rate; a diode pumped fiber amplifier disposed downstream from said oscillator and arranged to receive at least a portion of said optical pulses from said oscillator; and a controller operatively coupled to at least said passively mode locked oscillator, said controller comprising an element for monitoring a repetition rate of said passively mode locked oscillator, said element comprising a photodetector to receive and convert a fraction of the optical power of said optical pulses from said passively mode locked oscillator into electrical signals representative of said repetition rate, said controller capable of determining said repetition rate from said electrical signals and calculating a required down counter divide ratio needed to obtain a desired lower repetition rate, and wherein said controller is arranged to dynamically control a gain of said fiber amplifier or to control the amplitude of a seed pulse so as to maintain a desired output pulse energy from said high power amplifier system.