CN110838670A - Dispersion-controlled all-fiber supercontinuum generation device and application - Google Patents
Dispersion-controlled all-fiber supercontinuum generation device and application Download PDFInfo
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- CN110838670A CN110838670A CN201911154951.3A CN201911154951A CN110838670A CN 110838670 A CN110838670 A CN 110838670A CN 201911154951 A CN201911154951 A CN 201911154951A CN 110838670 A CN110838670 A CN 110838670A
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- 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
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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
- H01S3/06716—Fibre compositions or doping with active elements
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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
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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Abstract
The invention discloses an all-fiber supercontinuum generation device based on dispersion control, which comprises: the device comprises an ultrashort pulse laser seed, a dispersion compensation optical fiber, an optical fiber diode pump source, an optical fiber type wavelength division multiplexer, a gain optical fiber, a tapered photonic crystal optical fiber and an optical fiber collimation output head. The invention provides a novel optical fiber compressed pulse and a method for generating a super-continuum spectrum, which can make a super-continuum spectrum generating device into a full-optical-fiber structure by utilizing the adjustable property of the dispersion of a photonic crystal optical fiber and extremely strong nonlinearity, greatly reduce the volume of the device and improve the stability of a system, and have wide application prospects in the fields of optical fiber optical combs, biological imaging, ultra-fast spectroscopy, atomic spectrum measurement and the like.
Description
Technical Field
The invention belongs to the technical field of ultrafast lasers, and particularly relates to a dispersion-controlled all-fiber supercontinuum generation device and application thereof.
Background
In the last two decades, fiber lasers have been greatly developed due to their characteristics of stability, easy integration, non-maintenance, etc. A series of research works have also been carried out relying on fiber lasers. Among them, supercontinuum generation has received increasing attention because of its application in bioscience, precision machining, medical imaging, and in particular, optical fiber optical combing.
The concept of optical frequency comb was proposed in the last 70 th century and in the 90 th century, with the development of mode-locked lasers, the research of optical frequency comb has made great progress. Professors Hansch and Hall in 2005 were awarded the nobel prize for their contribution in precision spectroscopy, including optical frequency combing. The optical frequency comb is defined as: the mode-locked laser is represented as a series of optical pulses in the time domain, each pulse is composed of a carrier and an envelope, and the carrier and the envelope generate certain offset due to different group velocities in the process of pulse propagation, and the offset is the carrier envelope phase. And on the corresponding frequency domain, the mode-locked laser consists of a series of comb teeth at equal intervals, the intervals of the comb teeth are repetition frequencies, and the offset of the whole comb teeth and zero frequency is carrier envelope phase-shift frequency. The frequency of any comb teeth of the mode-locked laser can be represented by superposition of the repetition frequency and the carrier envelope phase-shift frequency, and once the repetition frequency and the carrier envelope phase-shift frequency are stabilized, the stabilization of the whole comb teeth is realized, and a complete optical frequency comb is obtained. Generally, the repetition frequency can be directly measured, and the measurement of the carrier envelope phase shift frequency usually requires the use of f-2f self-reference technology, which utilizes the frequency multiplication of the low frequency part of the spectrum, and the generated high frequency component is then beat frequency with the similar frequency comb to generate the carrier envelope phase shift frequency, which requires at least obtaining a supercontinuum over one octave for the time domain spectrum.
The conventional optical fiber supercontinuum generation device is generally composed of 4 parts of a seed source, an amplifier, a compressor and a spectrum broadening, wherein the use of space elements is inevitable, which undoubtedly increases the volume and the instability of the system. Especially for pulse compression of 1 micron ytterbium doped fiber, is basically achieved using a space element. The reason is that the pulse compression process is actually a dispersion compensation process, and in a 1-micron waveband, the introduced common single-mode fiber and the introduced gain fiber are both positive dispersion and cannot be compensated with each other, so that in the 1-micron waveband, the dispersion in the cavity is usually compensated by using space devices such as a grating pair, a prism pair, a chirped mirror and the like.
Disclosure of Invention
Therefore, the present invention is directed to overcoming the drawbacks of the prior art and providing a dispersion-controlled all-fiber supercontinuum generation apparatus and application.
Before the technical solution of the present invention is explained, the terms used herein are defined as follows:
the term "ultrashort pulse laser seed" refers to: can generate femtosecond (10)-15s) pulsed mode-locked oscillator, including but not limited to all solid state mode-locked oscillator, fiber mode-locked oscillator, titanium-sapphire oscillator, and the like.
To achieve the above object, a first aspect of the present invention provides a dispersion-controlled all-fiber supercontinuum generating apparatus, comprising: the device comprises an ultrashort pulse laser seed, a dispersion compensation optical fiber, an optical fiber diode pump source, an optical fiber type wavelength division multiplexer, a gain optical fiber, a tapered photonic crystal optical fiber and an optical fiber collimation output head.
The apparatus according to the first aspect of the present invention, wherein the ultrashort pulse laser seed is a femtosecond fiber laser;
preferably, the mode locking mode adopts a nonlinear polarization selection mode locking mode;
more preferably, the central wavelength of the mode-locked laser is 900-1100 nm, preferably 950-1050 nm, and most preferably 1035 nm; and/or a bandwidth of 30 to 50nm, preferably 35 to 45nm, most preferably 40 nm.
The apparatus according to the first aspect of the present invention, wherein the dispersion compensating fiber provides negative dispersion at 1 μm for compensating positive dispersion of the entire system;
preferably, the dispersion compensating fibre is selected from one or more of: photonic crystal fibers, 3C fibers, chirped bragg fibers, preferably highly nonlinear photonic crystal fibers;
more preferably, the dispersion compensation fiber has a zero dispersion point of 700 to 900nm, preferably 750 to 850nm, and most preferably 800 nm.
The apparatus according to the first aspect of the present invention, wherein the fiber diode pump source is a semiconductor laser;
preferably, the pumping wavelength of the fiber diode pump source is 900-1000 nm, preferably 950-1000 nm, and most preferably 976 nmm; and/or
The maximum output power of the fiber diode pump source is 500-1000 mW, preferably 600-700 mW, and most preferably 680 mW.
The apparatus according to the first aspect of the present invention, wherein the optical fiber type wavelength division multiplexer has three ports, wherein a pass end is optically fused to the preceding stage seed, a reflection end is connected to the pump source, and the pass end and the reflection end are combined to a common end access amplifier;
preferably, the end-passing plating is carried out on an antireflection film of 1020-1080 nm; and/or the reflection end is plated with an antireflection film of 971-981 nm.
The device according to the first aspect of the present invention, wherein the cladding absorption of the gain fiber is 500-600 dB/m, preferably 500-550 dB/m, and most preferably 520 dB/m.
The device according to the first aspect of the present invention, wherein the tapered photonic crystal fiber is obtained by tapering a photonic crystal fiber, wherein the taper region has a length of 5 to 10cm, preferably 5 to 8cm, and most preferably 6 cm; and/or the core diameter is 1 to 5 μm, preferably 1 to 3 μm, and most preferably 2 μm.
The device according to the first aspect of the present invention, wherein the working distance of the fiber collimation output head is 300-800 mm, preferably 400-600 mm, and most preferably 500 mm; and/or
The output light spot diameter of the optical fiber collimation output head is 0.5-1 mm; preferably 0.8 to 1mm, most preferably 0.9 mm.
In a second aspect, the present invention provides a method for compressing pulses and generating a supercontinuum in an optical fiber, the method using the apparatus of the first aspect for compressing pulses and generating a supercontinuum.
A third aspect of the present invention provides the use of the dispersion-controlled all-fiber supercontinuum generating device of the first aspect in fiber optical combing, bioimaging, ultrafast spectroscopy and/or atomic spectroscopy.
To overcome the deficiencies of the prior art, the present inventors need to find optical fibers that can provide negative dispersion at 1 micron instead of these spatial devices. The inventors herein have chosen photonic crystal fibers. Photonic crystal fiber is a specially designed microstructured fiber. The cladding has a regularly arranged air hole structure. Photonic crystal fibers have many advantageous properties. Such as the characteristics of a single mode without cutoff, tunable dispersion, rich nonlinear effects and the like. The property of tunable dispersion of photonic crystal fibers is mainly utilized here: that is, when the core diameter of the photonic crystal is reduced, the zero dispersion point of the photonic crystal is blue-shifted correspondingly. If the photonic crystal fiber with the zero dispersion point less than 1 micron wavelength can be found, the negative dispersion can be provided at the position of 1 micron, the effect of compressing the pulse by using the fiber is realized, and the required ultrashort pulse is obtained.
The supercontinuum generation process uses a tapered photonic crystal fiber. The photonic crystal fiber has strong nonlinearity and definite dispersion zero point due to the special structure. The inventor can change the dispersion zero point thereof in a tapering manner so as to generate better spectrum expansion effect by matching with the light source in the experiment. In addition, the length of the high-nonlinearity fiber is greatly reduced by the tapered photonic crystal fiber, and the coherence of the output supercontinuum is also improved.
The invention aims to provide an all-fiber supercontinuum generating device with dispersion control, which realizes that an all-fiber structure generates high-coherence octave supercontinuum.
The embodiment of the invention is realized in such a way that the dispersion-controlled all-fiber supercontinuum generation device comprises: the system comprises an ultrashort pulse laser seed 1, a dispersion compensation fiber 2, a fiber diode pump source 3, a fiber type wavelength division multiplexer 4, a gain fiber 5, a tapered photonic crystal fiber 6 and a fiber collimation output head 7.
The ultra-short pulse laser seed has the output wavelength of about 1 micron, the pulse width of less than 100fs and the power of less than 500mW and is used for providing a seed source for generating a super-continuum spectrum;
a dispersion compensating fiber for compensating dispersion of the entire system;
the fiber diode pump source is used for providing pumping input required by fiber amplification;
the optical fiber type wavelength division multiplexer is used for coupling the pump light and the seed light into the amplifier;
a gain fiber for providing fiber amplified gain;
the taper photonic crystal fiber is tapered to improve nonlinearity, is used for broadening a spectrum and obtains super-continuum spectrum output;
and the optical fiber collimation output head is used for collimating and outputting the obtained supercontinuum.
Further, dispersion compensating fibers for compensating dispersion, including but not limited to photonic crystal fibers, other fibers such as 3C fibers, chirped bragg fibers may be used, and it is desirable to provide a certain amount of negative dispersion at 1 μm for compensating the positive dispersion of the entire system.
Further, the used fiber diode pump is a semiconductor laser with the wavelength of 976nm, the output is stabilized by coupling into the fiber, and the fiber Bragg grating is used for stabilizing the output wavelength.
Further, the wavelength division multiplexer is usually made by melting and tapering two optical fibers or by packaging an optical filter, and the seed light passing through the dispersion compensation fiber and the pump laser generated by the fiber diode are coupled into the amplifier for amplification by the wavelength division multiplexer.
Furthermore, the gain fiber provides gain required by amplification, the length required in the experiment is different according to the difference of doping concentration of the gain fiber, the seed light and the pump laser are injected into the gain fiber, the pump light is absorbed, and the seed light is amplified.
Furthermore, the core diameter of the photonic crystal fiber can be effectively reduced in the tapering process, the nonlinearity of the fiber is improved, new frequency components are continuously generated by the pulse injected into the tapered fiber under the action of the nonlinear effect, and the spectrum is widened.
Further, the collimation output head is composed of a group of lenses, and after the generated super-continuous spectrum passes through the collimation output head, originally diffused light is collimated and shaped to be output in a collimation mode according to the designed light spot size.
The invention discloses a full-optical-fiber-structure octave supercontinuum generation device based on dispersion control. The device is formed by mutually welding a section of photonic crystal fiber, a section of gain fiber and a section of tapered photonic crystal fiber, and a space light path is not arranged in the middle. The method comprises the steps of firstly enabling ultrashort pulses to be incident into a section of photonic crystal fiber to pre-compensate dispersion, then connecting the ultrashort pulses into a section of gain fiber amplifier to improve output pulse energy, and finally using a section of special tapered photonic crystal fiber to perform spectrum expansion to obtain supercontinuum output of more than one octave. The invention provides a novel optical fiber compressed pulse and a method for generating a super-continuum spectrum, which can make a super-continuum spectrum generating device into a full-optical-fiber structure by utilizing the adjustable property of the dispersion of a photonic crystal optical fiber and extremely strong nonlinearity, greatly reduce the volume of the device and improve the stability of a system, and have wide application prospects in the fields of optical fiber optical combs, biological imaging, ultra-fast spectroscopy, atomic spectrum measurement and the like.
The dispersion-controlled all-fiber supercontinuum generation apparatus of the present invention may have, but is not limited to, the following beneficial effects:
the invention provides a dispersion-controlled all-fiber supercontinuum generation device. The super-continuum spectrum generating device can be made into an all-fiber structure by utilizing the dispersion tunable property and rich nonlinearity of the photonic crystal fiber. Compared with the traditional optical fiber supercontinuum generation scheme, the all-optical fiber supercontinuum generation device based on dispersion control has the advantages of simple structure, stable performance, good coherence and the like.
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
fig. 1 is a schematic optical path diagram of an all-fiber supercontinuum generation apparatus with dispersion control according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a supercontinuum provided by an embodiment of the present invention.
Fig. 3 shows a schematic diagram of a detected carrier envelope phase shifted frequency signal provided by an embodiment of the present invention.
Description of reference numerals:
1. ultra-short pulse laser seed; 2. a dispersion compensating fiber; 3. a fiber diode pump source; 4. an optical fiber type wavelength division multiplexer; 5. a gain fiber; 6. tapering a photonic crystal fiber; 7. and the optical fiber collimation output head.
Detailed Description
The invention is further illustrated by the following specific examples, which, however, are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
This section generally describes the materials used in the testing of the present invention, as well as the testing methods. Although many materials and methods of operation are known in the art for the purpose of carrying out the invention, the invention is nevertheless described herein in as detail as possible. It will be apparent to those skilled in the art that the materials and methods of operation used in the present invention are well within the skill of the art, provided that they are not specifically illustrated.
The materials and instruments used in the following examples are as follows:
materials:
yb125 type ytterbium-doped gain fiber, available from Coractive corporation;
yb406 model ytterbium-doped gain fiber, available from Coractive corporation;
reflective gratings were purchased from lightsymth, inc;
the photonic crystal fiber is purchased from long flying optical fiber cable GmbH, and has the model number of SC-4.6-1000-46CB 0;
wavelength division multiplexer, model HPFWDM-1040/976-B-10-NE-SS, from Feibote opto-electronic technology, Inc.
Example 1
This embodiment is used to illustrate the structure of the dispersion-controlled all-fiber supercontinuum generating apparatus of the present invention.
As shown in fig. 1, the dispersion-controlled all-fiber supercontinuum generation apparatus according to the embodiment of the present invention mainly includes: the system comprises an ultrashort pulse laser seed 1, a dispersion compensation fiber 2, a fiber diode pump source 3, a fiber type wavelength division multiplexer 4, a gain fiber 5, a tapered photonic crystal fiber 6 and a fiber collimation output head 7.
In the embodiment of the present invention, the ultrashort pulse laser seed 1 is a femtosecond fiber laser, and a mode locking mode with nonlinear polarization selection is adopted, and the mode locking repetition frequency is 216 MHz. The oscillator gain fiber adopts Yb125 model ytterbium-doped gain fiber of Coractive company, and the length of the Yb125 model ytterbium-doped gain fiber is 12 cm; a pair of 1000-groove reflective gratings is used for carrying out dispersion compensation in the cavity, and the cavity is enabled to operate in a near-zero dispersion region by adjusting the distance between the reflective gratings. When the pumping power is 500mW, the oscillator can output 100mW of mode locking sequence. The central wavelength of the mode-locked laser is 1035nm, and the bandwidth is 40 nm.
The dispersion compensation fiber 2 is used for dispersion compensation in a system, in the embodiment, a high nonlinear photonic crystal fiber with a zero dispersion point of 800nm is adopted, the core diameter is 2.2 mu m, the cladding is 125 mu m, and the dispersion parameter D at 1030nm is 60 ps/nm.km;
the optical fiber diode pump source 3 is used for providing pumping input required by optical fiber amplification, in the embodiment, the pumping wavelength is stabilized at 976nm, the maximum output power is 680mW, the type of the output optical fiber is HI1060, and the numerical aperture is 0.22;
the optical fiber type wavelength division multiplexer 4 is used for coupling the pumping light and the seed light into the amplifier, the customized wavelength division multiplexer in the embodiment has three ports, wherein a 1020-1080nm antireflection film is plated through a pass end (pass) to be in optical fusion with the pre-stage seed light, a 971-981 nm antireflection film is plated through a reflection end (reflex) to be connected with a pumping source, and the two are combined and bundled to a common end (commom) to be coupled into the amplifier;
the gain fiber 5, used to provide fiber amplified gain, in this embodiment was a ytterbium-doped gain fiber of type Yb406 from corative corporation, with a cladding absorption of 520 dB/m. The length is 15 cm.
The tapered photonic crystal fiber 6 is used for broadening a spectrum to obtain a super-continuum output, and the tapered photonic crystal fiber in the embodiment is obtained by tapering a commercial photonic crystal fiber with a zero dispersion point near 1030 nm. Tapering the optical fiber: firstly, taking a section of photonic crystal fiber with the length of about 15cm, stripping a coating layer of 3 cm in the middle of the photonic crystal fiber, and inflating the photonic crystal fiber to protect the internal structure of the photonic crystal fiber from being damaged in the tapering process. After the preparation is finished, the photonic crystal fiber is placed on a clamp of an optical fiber tapering machine, the part with the coating layer removed is heated by oxyhydrogen flame, and meanwhile, the clamp moves towards two ends to draw the optical fiber. And stopping the tapering process after the optical fiber stretching length is observed to meet the calculation requirement. Wherein the length of the cone region is 6cm, the core diameter is 2 μm, and the length of the whole photonic crystal fiber is 15 cm;
and the optical fiber collimation output head 7 is used for collimating and outputting the obtained supercontinuum, in the embodiment, the working distance of the collimator is 500mm, the diameter of an output light spot is 0.9mm, and the tail fiber is HI 1060.
Test example 1
This test example is used to illustrate the performance of an all-fiber supercontinuum generating device of the invention.
In fig. 1, an ultrashort pulse laser seed 1 directly outputs a subpicosecond pulse with positive dispersion, a 2-meter photonic crystal fiber 2 is then fused for dispersion compensation, and then the ultrashort pulse laser seed is connected into an amplifier, a fiber diode pump 3 is adopted as an amplifier pump light, the pump wavelength is stabilized at 976nm, the maximum output power is 680mW, the pump light and the seed light are coupled into the amplifier through a wavelength division multiplexer 4, an ytterbium-doped gain fiber of 406 Yb model of coreactive company is adopted as an amplifier gain fiber 5, the length is 15cm, an ultrashort pulse of 80fs is directly output after amplification, and finally a fused biconical photonic crystal fiber 6 is used for broadening a spectrum, and after a supercontinuum exceeding one octave is obtained, the ultrashort pulse is output in a collimated mode through a collimation output head 7. According to the principle of dispersion compensation, the width and intensity of the supercontinuum can be adjusted by: 1. adjusting the dispersion of the ultrashort pulse laser seeds; 2. and adjusting the length of the tail fiber of the wavelength division multiplexer.
According to the embodiment of the present invention, the supercontinuum obtained by the supercontinuum generation device covers 500-1250nm, as shown in FIG. 2.
According to the embodiment of the invention, in order to verify the performance of the obtained supercontinuum, the inventor detects that the carrier envelope phase shift frequency signal is about 37dB, and as shown in FIG. 3, the obtained supercontinuum is proved to have good coherence.
Although the present invention has been described to a certain extent, it is apparent that appropriate changes in the respective conditions may be made without departing from the spirit and scope of the present invention. It is to be understood that the invention is not limited to the described embodiments, but is to be accorded the scope consistent with the claims, including equivalents of each element described.
Claims (10)
1. A dispersion managed, all-fiber supercontinuum generating device, comprising: the device comprises an ultrashort pulse laser seed, a dispersion compensation optical fiber, an optical fiber diode pump source, an optical fiber type wavelength division multiplexer, a gain optical fiber, a tapered photonic crystal optical fiber and an optical fiber collimation output head.
2. The apparatus of claim 1, wherein the ultrashort pulse laser seed is a femtosecond fiber laser;
preferably, the mode locking mode adopts a nonlinear polarization selection mode locking mode;
more preferably, the central wavelength of the mode-locked laser is 900-1100 nm, preferably 950-1050 nm, and most preferably 1035 nm; and/or a bandwidth of 30 to 50nm, preferably 35 to 45nm, most preferably 40 nm.
3. The apparatus according to claim 1 or 2, wherein the dispersion compensating fiber provides negative dispersion at 1 μm for compensating positive dispersion of the entire system;
preferably, the dispersion compensating fibre is selected from one or more of: photonic crystal fibers, 3C fibers, chirped bragg fibers, preferably highly nonlinear photonic crystal fibers;
more preferably, the dispersion compensation fiber has a zero dispersion point of 700 to 900nm, preferably 750 to 850nm, and most preferably 800 nm.
4. The apparatus of any one of claims 1 to 3, wherein the fiber diode pump source is a semiconductor laser;
preferably, the pumping wavelength of the fiber diode pump source is 900-1000 nm, preferably 950-1000 nm, and most preferably 976 nmm; and/or
The maximum output power of the fiber diode pump source is 500-1000 mW, preferably 600-700 mW, and most preferably 680 mW.
5. The apparatus of any one of claims 1 to 4, wherein the fiber-optic wavelength division multiplexer has three ports, wherein a pass end is optically fused to a pre-seed, a reflection end is connected to a pump source, and the pass end and the reflection end are combined into a common end access amplifier;
preferably, the end-passing plating is carried out on an antireflection film of 1020-1080 nm; and/or the reflection end is plated with an antireflection film of 971-981 nm.
6. The device according to any of claims 1 to 5, wherein the cladding absorption of the gain fiber is 500-600 dB/m, preferably 500-550 dB/m, most preferably 520 dB/m.
7. The device according to any one of claims 1 to 6, wherein the tapered photonic crystal fiber is obtained by tapering a photonic crystal fiber, wherein the taper region has a length of 5-10 cm, preferably 5-8 cm, most preferably 6 cm; and/or the core diameter is 1 to 5 μm, preferably 1 to 3 μm, and most preferably 2 μm.
8. The apparatus of any one of claims 1 to 7, wherein the working distance of the fiber collimating output head is 300-800 mm, preferably 400-600 mm, most preferably 500 mm; and/or
The output light spot diameter of the optical fiber collimation output head is 0.5-1 mm; preferably 0.8 to 1mm, most preferably 0.9 mm.
9. A method of optical fiber pulse compression and supercontinuum generation, characterized in that the method uses the device according to any one of claims 1 to 8 for pulse compression and supercontinuum generation.
10. Use of the dispersion-controlled all-fiber supercontinuum generation apparatus of any one of claims 1 to 8 in fiber optical combing, bioimaging, ultrafast spectroscopy and/or atomic spectroscopy.
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| CN111399306A (en) * | 2020-03-11 | 2020-07-10 | 北京大学深圳研究生院 | Ultrashort pulse sequence generating device with conical silicon-based waveguide |
| CN111987577A (en) * | 2020-06-05 | 2020-11-24 | 南京大学 | All-fiber laser with flexibly multiplied repetition frequency |
| CN112729773A (en) * | 2021-02-08 | 2021-04-30 | 北京明睿光谱科技有限公司 | Micro-nano optical fiber dispersion measurement method |
| CN114188811A (en) * | 2021-12-03 | 2022-03-15 | 武汉光迅电子技术有限公司 | Optical amplifier and control method thereof |
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| CN114188811A (en) * | 2021-12-03 | 2022-03-15 | 武汉光迅电子技术有限公司 | Optical amplifier and control method thereof |
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