Multiplying the repetition rate of passive mode-locked femtosecond lasers by an intracavity flat surface with low reflectivity |
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Authors: | Liu Tzu-Ming Kärtner Franz X Fujimoto James G Sun Chi-Kuang |
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Institution: | Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 10617, Taiwan. |
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Abstract: | 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. |
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