CN112242640B - Supercontinuum light source based on high-power multimode laser and super multi-core high-nonlinearity optical fiber - Google Patents
Supercontinuum light source based on high-power multimode laser and super multi-core high-nonlinearity optical fiber Download PDFInfo
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- CN112242640B CN112242640B CN201910653228.3A CN201910653228A CN112242640B CN 112242640 B CN112242640 B CN 112242640B CN 201910653228 A CN201910653228 A CN 201910653228A CN 112242640 B CN112242640 B CN 112242640B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06741—Photonic crystal fibre, i.e. the fibre having a photonic bandgap
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094069—Multi-mode pumping
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Abstract
A super-continuum spectrum light source based on a high-power multi-mode laser and a super multi-core high-nonlinearity optical fiber comprises the high-power multi-mode laser and the super multi-core high-nonlinearity optical fiber. High-power multimode laser is introduced into the super-multicore high-nonlinearity fiber through a coupling technology, and super-continuum spectrum laser is generated. The invention breaks through the current situation that multimode laser is difficult to be used as a pumping light source to directly generate the super-continuum spectrum, and can realize the super-continuum spectrum laser with high power and wide waveband.
Description
Technical Field
The invention relates to the technical field of fiber laser, in particular to a supercontinuum light source based on a high-power multimode laser and a super multi-core high-nonlinearity fiber.
Background
The supercontinuum light source refers to a high-brightness broadband light source with extremely wide wavelength coverage range. Typically produced using high brightness single mode laser pumped highly nonlinear fibers. The single-mode laser pump source with high brightness is adopted because the high-nonlinearity fiber is usually small in core diameter, and the compact mode field of the high-nonlinearity fiber is easier to realize. Only a single-mode laser pump source can be successfully coupled into a high-nonlinearity fiber with a small core diameter.
However, many application scenarios require high power or large energy supercontinuum lasers, which must be pumped with high power or large energy lasers. For example, in the fields of remote hyperspectral radar detection and the like, high-power supercontinuum light sources with different working wave bands can be used for detecting different biological species, and the development of a biodiversity remote sensing detection technology is greatly promoted. Multimode lasers, which are much higher in power and energy than single-mode lasers, are often used as pump sources for the above scenarios. However, multimode laser light has poor beam quality, and thus is difficult to efficiently couple into a small-core high-nonlinearity fiber.
The chinese utility model patent with publication number "CN 202995205U" proposes to use a multi-core fiber to generate a high power super-continuum spectrum, which starts from the improvement of the damage threshold of the fiber by the multi-core structure, but does not solve the technical problem of generating the super-continuum spectrum laser by the high power multi-mode laser pump.
Disclosure of Invention
The invention provides a super-continuum spectrum light source based on a high-power multimode laser and a super-multicore high-nonlinearity optical fiber, and provides a novel light source for the fields of remote hyperspectral radar detection and the like.
The coupling efficiency can be ensured by the following relation between the diameter of the fiber core region and the cross section of the pump laser beam, as shown in formula (1):
NAfiber*Dfiber≈NA*D (1)
NA in the above formulafiberThe equivalent numerical aperture of the whole core area is expressed and can be similar to the numerical aperture of a single fiber instead. By greatly increasing the number of cores, the equivalent core diameter D of the optical fiber can be increasedfiber。
The numerical aperture of the output beam is generally defined by equation (2):
NA＝sinθ (2)
in the above equation, θ represents the half angle of divergence of the light beam.
The divergence half-angle of the output beam can be expressed as equation (3):
in the above formula M2For the beam quality of the output beam, λ is the pumpThe center wavelength of the laser, R, is the beam radius of the output beam.
When the central wavelength of the high-power multimode laser is 1064 nm, the equivalent core diameter of the multicore high-nonlinearity fiber is 100 μm, and the NA is 0.3, the beam quality of the pumping source can be deduced to be 45 by the above formulas (1), (2), and (3). In other words, for high power multimode lasers with such poor beam quality, supercontinuum laser light can still be generated by increasing the equivalent core diameter of the multicore photonic crystal fiber.
The invention adopts a multi-mode laser as a pumping source, and the power and the energy of the multi-mode laser are far larger than those of a single-mode laser. The super multi-core fiber structure is used for increasing the equivalent diameter of the photonic crystal fiber so that the photonic crystal fiber is matched with the large mode field of high-power multimode laser. The invention mainly utilizes the high inclusiveness of the super multi-core fiber to the quality of the pump laser beam, and directly generates the high-brightness, high-power and broadband super-continuum spectrum laser through the high-power multi-mode laser.
The invention discloses a supercontinuum light source based on a high-power multimode laser and a super multi-core high-nonlinearity fiber, which comprises: the high-power multi-mode laser and the super multi-core high-nonlinearity fiber are used for introducing output light of the high-power multi-mode laser into the super multi-core high-nonlinearity fiber through a coupling technology to generate super continuum spectrum laser.
Preferably, the high power multimode pump laser is continuous or pulsed.
Further, the high-power multimode pump laser is any one of a fiber laser, a solid laser, or a semiconductor laser.
Still further, the high power multimode pump laser may be polarization-maintaining or non-polarization-maintaining.
Furthermore, the M square factor of the high-power multimode pump laser is greater than or equal to 2, and the beam quality is not a single transverse mode.
Furthermore, the average output power of the high-power multi-mode laser is in the range of hundreds of watts to ten thousand watts.
Preferably, the number of cores of the super multicore high nonlinear optical fiber is greater than or equal to 30.
Further, the super multicore high nonlinear fiber is an air hole multicore photonic crystal fiber structure or an all solid-state multicore fiber structure.
Furthermore, the diameter of the core area of the super-multicore high-nonlinearity optical fiber is greater than or equal to 30 microns.
Further, the numerical aperture of most single cores of the super-multicore high-nonlinearity fiber is not more than 300% compared with the numerical aperture of the high-power multimode laser.
Furthermore, the diameter of each fiber core of the super-multicore high-nonlinearity fiber is about 3-6 microns.
Furthermore, the filling rate of the super-multicore high-nonlinearity fiber is 0.5-0.8.
Furthermore, the radial structure of the super-multicore high-nonlinearity fiber can be adjusted, and the zero dispersion point of the multicore high-nonlinearity fiber is matched with the wavelength of the pump laser by changing the refractive indexes of the core and the cladding.
Further, the multicore highly nonlinear fiber longitudinal uniformity may be adjustable, uniform or non-uniform.
Furthermore, the substrate material of the super-multicore high-nonlinearity optical fiber is selected according to different super-continuum spectrum working bands and is any one of quartz (working in visible light and near infrared bands), telluride, fluoride (working in middle infrared bands) and sulfide (working in far infrared bands).
Furthermore, the service length of the multicore high nonlinear optical fiber is meter-level to kilometer-level.
Preferably, the high-power multi-mode laser and the super multi-core high-nonlinearity fiber are coupled in a fusion welding mode or other space coupling modes.
Preferably, the light spot of the supercontinuum light source based on the high-power multimode laser and the super multi-core high-nonlinearity fiber is a non-single transverse mode, and the light intensity distribution at the far field is flat-top type or Gaussian-like type.
The invention has the following technical characteristics and advantages:
1. the pump laser is a high power multimode laser.
2. The high containment of the super-multicore high-nonlinearity fiber enables the fiber to be matched with high-power multimode laser with the beam quality of more than or equal to 2.
3. The output laser of the supercontinuum light source is multimode.
4. The output laser power and energy of the super-continuum spectrum light source are far higher than those of the prior art, and when the kilowatt-level continuous laser pumps the super-multicore high-nonlinearity fiber, the generated super-continuum spectrum laser power is at least hundreds of watts.
5. Compact structure and simple construction.
Drawings
Fig. 1 is a schematic structural diagram of a supercontinuum light source based on a high-power multimode laser and a super multicore high nonlinear optical fiber according to the present invention.
In the figure, 1-high power multimode laser; 2-super multicore high nonlinear optical fiber.
Fig. 2 is a schematic end view of a super-multicore all-solid-state optical fiber.
In the figure: 3-core of the super multi-core all solid state optical fiber.
FIG. 3 is a schematic end view of a multicore air hole type photonic crystal fiber.
In the figure: 4-fiber core of the multicore air hole type photonic crystal fiber; 5-super multicore air hole type photonic crystal fiber cladding air hole.
Detailed Description
The invention is further illustrated with reference to the following examples and figures, without thereby limiting the scope of the invention.
FIG. 1 is a schematic structural diagram of a supercontinuum light source based on a high-power multimode laser and a multicore high-nonlinearity fiber. The supercontinuum light source based on the high-power multi-mode laser and the super multi-core high nonlinear optical fiber comprises a high-power multi-mode laser 1 and a super multi-core high nonlinear optical fiber 2. The output light of the high-power multi-mode laser is introduced into a super multi-core high-nonlinearity fiber through a coupling technology to generate a super continuum spectrum. The super multi-core high nonlinear optical fiber is a super multi-core all-solid-state optical fiber, the end surface of which is shown in fig. 2, and the fiber core of which is shown in fig. 3; or a multicore air hole type photonic crystal fiber, the end face of which is shown in fig. 3, wherein 4 is the fiber core and 5 is the cladding air hole.
In one embodiment of the present invention, the high power multimode laser 1 is a continuous fiber laser with an average output power of kilowatt level, the center wavelength is 1.08 microns, the output tail fiber is a multimode double-clad fiber with a fiber core of 30 microns, an inner cladding of 600 microns and an outer cladding of 750 microns, and the light beam is finally output in a fiber laser cable. And finally, directly irradiating the output light beam of the pump laser into the super multi-core high nonlinear optical fiber 2 to generate the super continuum spectrum laser.
The super multi-core high nonlinear fiber 2 used in the present embodiment is a thirty-seven core photonic crystal fiber, the substrate material is quartz, the diameter of each core 4 is about 3 to 6 microns, and the filling rate is 0.5 to 0.8. The thirty-seven core photonic crystal fiber used in this example had a zero dispersion point located around 1 micron and the fiber was longitudinally uniform, about one hundred meters in length.
In another embodiment of the present invention, the high power multimode laser 1 has a center wavelength at 980 nm, a continuous optical semiconductor laser with a core of 300 μm, a numerical aperture of 0.22 and an average output power of up to kilowatt, and finally outputs in the form of a fiber laser cable. The pump source is directly injected into a super-multi-core high-nonlinearity optical fiber 2, the optical fiber is a one-hundred twenty-seven-core photonic crystal optical fiber, the base material of the optical fiber is quartz, the diameter of each fiber core is about 3-6 micrometers, the filling rate is 0.5-0.8, the zero dispersion point of the optical fiber is located near 1 micrometer, the optical fiber is longitudinally uniform, and the length of the optical fiber is about one-hundred meters.
The super-multicore high-nonlinearity fiber for kilowatt-level continuous laser pumping in the embodiment of the invention generates super-continuum spectrum laser power of at least hundred watts.
Claims (10)
1. A supercontinuum light source based on a high-power multimode laser and a super multi-core high-nonlinearity fiber comprises: high power multimode laser and high nonlinear optical fiber of super multicore, its characterized in that: the output light of the high-power multimode laser is introduced into a super-multicore high-nonlinearity fiber through a coupling technology to generate super-continuum spectrum laser, the number of fiber cores of the super-multicore high-nonlinearity fiber is more than or equal to 30, and the power of the super-continuum spectrum laser is at least hundred watt level.
2. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 1, wherein: the M square factor of the high-power multi-mode laser is greater than or equal to 2, and the beam quality of the high-power multi-mode laser is a non-single transverse mode.
3. The supercontinuum light source based on a high power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 2, characterized in that: the high-power multimode laser is any one of a fiber laser, a solid laser or a semiconductor laser.
4. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 1, wherein: the light spots of the supercontinuum light source based on the high-power multimode laser and the super multi-core high-nonlinearity fiber are in a non-single transverse mode, and the light intensity distribution at the far field is flat-top type or Gaussian-like type.
5. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 4, wherein: the super multi-core high nonlinear optical fiber is in an air hole type photonic crystal fiber structure or an all-solid-state type multi-core fiber structure.
6. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 5, wherein: the diameter of a fiber core area of the super-multicore high-nonlinearity fiber is larger than or equal to 30 microns.
7. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 5, wherein: the numerical aperture of most single cores of the super-multicore high-nonlinearity fiber is not more than 300% compared with the numerical aperture of the high-power multimode laser.
8. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 5, wherein: and the diameter of each fiber core of the super-multicore high-nonlinearity fiber is 3-6 microns.
9. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 5, wherein: the filling rate of the super-multicore high-nonlinearity optical fiber is 0.5-0.8.
10. The supercontinuum light source based on a high-power multimode laser and a multicore high nonlinear optical fiber as claimed in claim 5, wherein: the substrate material of the super-multicore high-nonlinearity fiber is any one of quartz, telluride, fluoride and sulfide.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102967981A (en) * | 2012-12-18 | 2013-03-13 | 中国人民解放军国防科学技术大学 | Super-continuous spectrum light source based on multicore photonic crystal fiber |
| JP2015114548A (en) * | 2013-12-12 | 2015-06-22 | 日本電信電話株式会社 | Optical multiplexer/demultiplexer and optical communication system |
| CN104749715A (en) * | 2013-12-30 | 2015-07-01 | 福州高意通讯有限公司 | Single-mode optical fiber coupling structure of multi-transverse mode laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102967981A (en) * | 2012-12-18 | 2013-03-13 | 中国人民解放军国防科学技术大学 | Super-continuous spectrum light source based on multicore photonic crystal fiber |
| JP2015114548A (en) * | 2013-12-12 | 2015-06-22 | 日本電信電話株式会社 | Optical multiplexer/demultiplexer and optical communication system |
| CN104749715A (en) * | 2013-12-30 | 2015-07-01 | 福州高意通讯有限公司 | Single-mode optical fiber coupling structure of multi-transverse mode laser |
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