| Summary: | 碩士 === 國立清華大學 === 物理系 === 104 === We designed constructed and analyzed a dual-stage fiber amplifier to amplify noise-like pulses (NLP) from a dispersion-mapped fiber laser. The dual-stage amplifier system was composed of a 10-μm-core Yb-doped fiber as pre-amplifier and a 30-μm-core Yb-doped fiber as the main amplifier. We achieved an amplified NLP of the highest output average power of 14.7 W with a repetition rate of 15 MHz, and the pulse energy of 0.98 μJ.
NLP exhibits a very smooth and broadband spectrum, a double-scale autocorrelation trace with a sub-picosecond peak riding and a wide sub-nanosecond pedestal. Light sources generating pulse with such narrow autocorrelation and broadband spectra, capable of propagating without distortion over a long distance. After the pre-amplifier, the pedestal duration increased slightly when the pump power increased, while the spike duration decreased dramatically. After the main amplifier, the trend of the pedestal and the spike duration is very similar to the pre-amplifier. The numerical result of the pedestal duration based on the nonlinear Schrodinger equation (NLSE) also changed slightly and the spike duration decreased when the pump power increased, which had the same tendency as the experimental results.
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