Ultraviolet-enhanced Supercontinuum Generation With A Fiber Laser Operating In Dissipative Soliton Resonance Region

Supersontinuum(SC)source known as the white light laser,has the advantages of ultra-broad spectral coverage,high brightness,good spatial coherence.Consequently,it would be applied in numerous applications such as optical coherence tomography,spectroscopy,optical frequency measurement,biomedicine and so on.To obtain a Supercontinuum source with blue-enhanced even ultraviolet-enhanced spectrum and high spectral power density of visible region is one research topic in this field.Supercontinuum generation with a fiber laser operating in dissipative soliton resonance region is studied theoretically and experimentally in this thesis.The main contents of this dissertation are presented as follows:1.A scheme of ultraviolet-enhanced supercontinuum generation in a seven-core photonic crystal fiber pumped by fiber laser operating in dissipative soliton resonance region was proposed for the first time.Combined with the numerical simulation,the effects of fiber structure and pulse parameters(pulse width,center wavelength and chirp)on supercontinuum generation were analyzed.The results showed that the proposed scheme is effective and can achieve ultraviolet-enhanced supercontinuum generation.2.Based on the figure-eight laser structure,by parameter optimization,a fiber laser operating in dissipative soliton resonance region was set up with peak power at 840 W.And then after a one-stage amplification by double-cladding fiber,a giant-chirped pulse laser with highest output power at 15 W,the peak power at 10 kW and the peak wavelength at 1045 nm was obtained.3.A simple and compact all-fiber ultraviolet-enhanced supercontinuum source in seven-core photonic crystal fiber pumped by fiber laser operating in dissipative soliton resonance region was demonstrated by using low-loss splicing technology.The supercontinuum with an average output power of 6.86 W,a spectral spanning from 350 nm to 2400 nm was obtained.Over 34% of the total SC power was located in the visible region.To the best of our knowledge,this was the first demonstration of wide-band supercontinuum generation with a fiber laser operating in dissipative soliton resonance region,and was also the widest supercontinuum generation with the highest efficiency of visible part obtained in seven-core PCF.