Multiplying the repetition rate of passive mode-locked femtosecond lasers by an intracavity flat surface with low reflectivity.
By inserting a low-reflectivity flat surface inside the oscillator cavity, we demonstrate a flexible and phase-insensitive method for multiplying the repetition rate of a femtosecond passive mode-locked solid-state laser. Without mode matching and feedback control, we successfully multiplied the repetition rate of a passively mode-locked Cr:forsterite laser from 124 MHz to 1.24 GHz. High-repetition-rate femtosecond optical pulses with average power of >100 mW can be obtained with the demonstrated method.
Liu
Tzu-Ming
TM
Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 10617, Taiwan.
Kärtner
Franz X
FX
Fujimoto
James G
JG
Sun
Chi-Kuang
CK