1?m Band-enhanced Supercontinuum Source

In this paper,1?m-band enhanced supercontinuum source is studied,which combines the high energy as pulsed laser and the wide spectrum,and has potential applications in the field of laser processing and imaging.The wide spectrum characteristics of this new type of light source can be used to increase the material's absorption of laser and change its properties during laser processing,which promotes the effective and rapid processing of the high-energy pulsed laser contained in the 1?m-band.In addition,in the field of imaging,the wide spectrum can realize hyperspectral imaging and obtain three-dimensional data of hypercube(including two spatial planar dimensions and one spectral dimension),while 1?m-band high-energy pulsed laser can realize laser lidar and obtain a spatial distance dimension.In this paper,two different schemes are designed to implement the 1 ?m-band enhanced supercontinuum source.The main results are as follows:1.A 1?m band enhanced supercontinuum source based on pulse waveform regulation is proposed and implemented.Arbitrary waveform generator is used to change the pulse laser waveform which contains a high amplitude narrow-pulse and a low amplitude wide-pulse.After being amplified,the pulse laser is input to the photonic crystal fiber.The high amplitude narrow-pulse broaden wide-spectrum through the strong nonlinearity,while the low amplitude wide-pulse directly output through the weak nonlinearity.So that,the system finally realizes the 1?m band enhanced supercontinuum source.This scheme allows flexible regulation of time-frequency characteristics,but the pulse energy of 1?m band is greatly limited.2.The 1?m band enhanced supercontinuum source based on the ytterbium-doped fiber amplifier is proposed and realized.The supercontinuum source with high flatness is input into the Yb-doped fiber amplifier,and the energy of 1?m band is increased by the gain of ytterbium ions.The maximum output power of the system is 112.5 W with a lightlight efficiency of 75%,and the spectrum is eventually expanded to cover 1,000nm-2200 nm.The 3-dB bandwidth of the spectrum is 8.6 nm with a spectrum energy ratio of 45.08%.The 30-dB bandwidth is 203 nm with a spectrum energy ratio of 98.77%.The 43-dB bandwidth is 1150 nm with a spectrum energy ratio of 99.88%.This scheme can achieve high energy of 1?m band.