Patent ID: 7551652

Claim:
A laser source, comprising: a first Q-switched fiber laser having a first polarization dependent active fiber chain configured to generate a first sequence of laser pulses at a frequency ω 1 ; a second Q-switched fiber laser having a second polarization dependent active fiber chain configured to generate a second sequence of laser pulses at a frequency ω 2 , wherein the first and second fiber chains are fixed to a mounting structure; and a shared modulator comprising a piezoelectric transducer (PZT) that selectively applies radial stress to both said first and second polarization dependent active fiber chains simultaneously to induce birefringence and switch the cavity Q-factors to store energy in the active fiber chain and then release the energy in the first and second sequences of temporally overlapping laser pulses, said shared modulator further comprises a calibration mechanism that adjusts an initial position of the PZT so that said first and second laser pulses overlap temporally, said calibration mechanism comprises a structure above the PZT in a fixed space relation to the mounting structure and first and second adjust screws through the structure and contacting the PZT to adjust its initial position.