Abstract
For the shortcomings of current schemes to generate laser supercontinuum spectra,an acousto-optic Q-switched nanosecond all fiber laser is established.The laser shows its central wavelength at 1 064.3nm,repetition rate of 20kHz and a pulse duration of 250ns.After primary amplification,the output power is 13.02 W.When the amplified pulse is launched into a self-made high power Mode Field Adaptor(MFA),the signal light output can be 10.7 W and the coupling efficiency is up to 82.2%.After the MFA is spliced with a piece of Photonic Crystal Fiber(PCF),the output supercontinuum spectrum with an average output power of 5.43Wcan be obtained at a wavelength range from 900nm to 1 700nm.As the Acoustic Optical Modulator(AOM)in the experiment has a wider pulse duration,which leads to a lower peak value of pump light and a lower nonlinear effect,so that the supercontinuum spectra do not include the visual part.It suggests that the AOM with narrower pulse duration should be used to generate high peak power to widen the spectral bandwidth and flatten the supercontinuum spectra.
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