A supercontinuum light source based on a noise-like mode locked pulsed pump

A supercontinuum light source and mode-locked pulse technology, which is applied to lasers, phonon exciters, laser components, etc., can solve problems such as low output power, low amplification efficiency, and complex structure, and achieve high power and high amplification efficiency , Simple and compact structure

Inactive Publication Date: 2017-05-31
武汉长进光子技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream technology for generating supercontinuum is to amplify mode-locked ultrashort pulses or Q-switched pulses to obtain short pulses with sufficiently high peak power, and finally couple them into photonic crystal fibers to obtain broadband supercontinuum. If the pulse seeds are mode-locked Obtained, the output power is often low, the amplification efficiency is low, and multi-stage amplification is required, and the general passive mode-locked laser uses a saturable absorber, or polarization rotation mode-locking, etc., the structure is more complex and the cost is relatively high

Method used

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  • A supercontinuum light source based on a noise-like mode locked pulsed pump
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  • A supercontinuum light source based on a noise-like mode locked pulsed pump

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Embodiment 1

[0037] In this embodiment, an all-fiber ultra-broadband supercontinuum light source with simple structure and low cost is built. Its structure is as follows: figure 1 As shown, it includes three parts: noise-like mode-locked short pulse seed source, pulse amplification system and highly nonlinear photonic crystal fiber, among which,

[0038] The noise-like mode-locked short pulse seed source includes a broadband fiber mirror 1 , an ytterbium-doped fiber 2 , a first beam combiner (or wavelength division multiplexer) 3 , a first semiconductor laser 4 and a first fiber coupler 5 . The optical fiber reflector 1 is a broadband high reflectivity reflector near 1um, and its reflection bandwidth covers the emission wavelength range of the entire ytterbium-doped optical fiber 2. In this embodiment, a broadband reflector with a central wave of 1030-1080nm and a bandwidth of 5-200nm is used. The ytterbium-doped fiber 2 is a double-clad ytterbium-doped fiber or a single-clad ytterbium-dop...

Embodiment approach

[0042] As a preferred embodiment of the present invention, the selection of the high nonlinear photonic crystal fiber 13 and the selection mode of the pigtail of the isolator 12 and the high nonlinear photonic crystal fiber 13 welding parameters are as follows:

[0043]1. If the required supercontinuum contains more visible light components, that is, the supercontinuum can be extended below 500nm, and the proportion of visible light is greater than 10%. The required supercontinuum has a large width and flatness, and a photonic crystal fiber with a small core and a large duty cycle should be selected, that is, a photonic crystal fiber with a core less than 4 μm and a duty cycle greater than 40%, such as a core 2.5μm photonic crystal fiber with 80% duty cycle.

[0044] At this time, the photonic crystal fiber with a small core and a large duty ratio is selected because there is a large mode field mismatch with the tail fiber of the isolator 12, and the splice loss will be large....

Embodiment 2

[0052] In this embodiment, the single-cladding structure of the core pump is used to realize the output of mode-locked noise-like mode-locked pulses. The structural schematic diagram is the same as that of Embodiment 1, but different devices are used. like figure 1 As shown, the ytterbium-doped fiber 2 used in the seed stage is a single-clad 6 / 125 highly doped ytterbium-doped fiber, and the single-cladding ytterbium-doped fiber is paired with a single-clad ytterbium-doped fiber through a wavelength division multiplexer 3 using a single-mode LD4 with a wavelength of 976nm and a maximum power of 600mW. The optical fiber 2 is pumped, and the pigtail fiber of the broadband fiber mirror 1 is fused with the single-clad ytterbium-doped fiber 2. The use of a highly doped single-clad ytterbium-doped fiber can reduce the length of the single-clad ytterbium-doped fiber, and at the same time Try to cut the tail fiber of the broadband fiber optic mirror as short as possible to shorten the...

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Abstract

The invention relates to a supercontinuum light source based on a noise-like mode locked pulsed pump. The light source comprises a noise-like mode locked short pulse seed source for providing a stable short pulse; a pulse amplification system for amplifying the pulse power of the stable short pulse; and a highly nonlinear photonic crystal fiber for broadening the spectrum of the pulse after being subjected to pulse power amplification by the pulse amplification system to obtain a flat supercontinuum source covering the ultraviolet to mid-infrared. The light source of the invention is simple in structure, relative low in cost, relatively high in efficiency, and can amplify the light pulse into the flat super-continuum spectrum enough to generate high power just through one-grade amplification.

Description

technical field [0001] The invention relates to a laser light source, in particular to a supercontinuum light source based on noise-like mode-locked pulse pumping, which is used to generate broadband supercontinuum. Background technique [0002] The supercontinuum light source is a new type of laser light source with an ultra-wide spectral range. Compared with the traditional wide light source, the supercontinuum light source has obvious characteristics and advantages, such as: the supercontinuum light source has a very wide spectral range, and it is easy to It reaches more than two octaves; the coherence of the spectrum is very good; the brightness of the supercontinuum is very high, and it can have a high energy density; the supercontinuum light source can have good beam quality, and it can still Can keep divergence small, and so on. Therefore, supercontinuum light sources have very important applications in many fields, such as lidar, long-distance communication, medical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/108H01S3/08
CPCH01S3/06708H01S3/06716H01S3/0675H01S3/08H01S3/108
Inventor 李进延罗兴刘长波
Owner 武汉长进光子技术股份有限公司
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