A Supercontinuum Laser Source with Ultra-wide Bandwidth

Abstract

The invention provides an ultra-large bandwidth super-continuum spectrum laser source. The ultra-large bandwidth super-continuum spectrum laser source mainly comprises a pulse optical-fiber laser device, an optical fiber amplifier and a germanium oxide optical fiber, wherein the germanium oxide optical fiber is a step-index type optical fiber with a refractive structure, an optical fiber with a photonic crystal structure or a micro-structural optical fiber. The ultra-large bandwidth super-continuum spectrum laser source introduces positive waveguide dispersion through the germanium oxide optical fiber, can move zero dispersion points of the germanium oxide optical fiber from a 1.7-micron waveband to a nearby 1.5-micron waveband in the short waveguide direction, makes the zero dispersion points be close to the wave length of the pulse optical-fiber laser device and forms a group velocity dispersion curve of frequencies symmetrically distributed about the zero dispersion points. An output spectrum of the laser source can cover a middle-infrared waveband of visible light, the ultra-large bandwidth super-continuum spectrum laser source has the advantages of being of an all-fiber structure, low in cost, good in stability and the like and is easily popularized and used in the lots of fields of optical element performance testing, micro-imaging, biomedicines, broad-spectrum sensing, spectroscopy and the like in a wide-range mode.

Description

technical field [0001] The invention relates to the field of supercontinuum lasers, in particular to a supercontinuum laser light source with super wide bandwidth. Background technique [0002] Supercontinuum laser sources have important application prospects in environmental detection, biomedicine, free space optical communication, infrared spectroscopy, homeland security and other fields. Compared with traditional incoherent fluorescent light sources, spontaneous emission light sources of rare earth elements, and thermal light sources, supercontinuum laser light sources have many advantages such as high brightness, good spatial coherence, compact structure, and wider spectral width. At present, the supercontinuum laser light source based on quartz (silica) fiber has been widely studied, and the technology has become mature. However, when the wavelength is greater than 2.4 μm (corresponding to phonon energy 1000cm -1 ), the phonon resonance absorption loss of the quartz m...

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Problems solved by technology

According to public information, although the germanium oxide fiber is also an ideal large-bandwidth low-loss infrared transmission fiber, due to the lack of control of the nonlinear and dispersion effects of the germanium oxide fiber, there is currently no ultra-wide bandwidth supercontinuum laser based on the germanium oxide fiber. Research and Report on Light Sources

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