| During these years, supercontinuum has been developed to be a very importantbranch of spectroscopy, pulse compression, tunable femtosecond laser source andoptical frequency comb. Femtosecond laser technologies play an important role due totheir short pulse, high peak power and broad spectrum. In the meantime, PhotonicCrystal Fiber (PCF) has many incomparable characteristics such as endlesssingle-mode transmission, controllable dispersion and designable nonlinear featureowing to its unique waveguide structure and flexible manufacture method. As a result,supercontinuum generation of femtosecond laser in PCF has attracted much attention.However, the scaling of power generation from single-core PCF is limited by its size.The emerging of multi-core PCF provides a new and reliable solution to achievehigher power. The main contents of this article include:1. An amplification system with a2m long domestic large-mode PCF isdemonstrated based on PCF mode-locking laser. Its slope efficiency achieves49.8%.This is the first time to realize the amplification of femtosecond laser by domesticfiber.2. Different supercontinuum light sources are set up based on PCF mode-lockinglaser. We experimentally study the spectra and mode generated in nine PCFs underdifferent pump power. The diameters of nine PCFs are similar, from110μm to190μm.As the diameter of PCF turns larger, there will be high-order mode and broadspectrum with isolated bands.3. Three supercontinuum sources under different output power are obtained fromthree seven-core PCFs, which indicate that the PCF with higher air-filling fraction, thespectrum broadens wider. The M2value is measured by using an optical bandpassfilter centered1040nm (~8nm bandwidth), which shows that the PCF with lowerair-filling fraction, the difference between M2and unity becomes much smaller. Theresults denote that there should be an optimization multicore PCF structure to balancethe supercontinuum width and beam quality. |
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