CN218123953U - Femtosecond fiber laser - Google Patents
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- CN218123953U CN218123953U CN202222217638.3U CN202222217638U CN218123953U CN 218123953 U CN218123953 U CN 218123953U CN 202222217638 U CN202222217638 U CN 202222217638U CN 218123953 U CN218123953 U CN 218123953U
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Abstract
The utility model discloses a femto second fiber laser, include: the device comprises a seed source, a first transmission grating pair, an ytterbium-doped fiber amplifier, a pulse compression system and a frequency doubling filter system which are sequentially arranged, wherein the seed source outputs mode locking pulses to the first transmission grating pair; the first transmission grating pair comprises two transmission gratings, the distance between the two transmission gratings is adjustable, and positive chirp is introduced into the mode-locking pulse by the first transmission grating pair to obtain a mode-locking pulse with positive chirp; the ytterbium-doped fiber amplifier amplifies the mode locking pulse with positive chirp to obtain an amplified mode locking pulse; the pulse compression system compresses the amplified mode locking pulse to obtain a compressed mode locking pulse; and the frequency doubling filtering system performs frequency doubling filtering on the compressed mode locking pulse to output a femtosecond laser pulse. Through implementing the utility model discloses, can obtain different frequency multiplication efficiency through the interval of adjusting first transmission grating pair, and then realize the optimization of frequency multiplication efficiency.
Description
Technical Field
The utility model relates to a laser technical field, concretely relates to femto second fiber laser.
Background
The high-power 515nm green laser plays an important role in the practical application of material cutting, material processing, ultrashort pulse laser pumping source and the like; the frequency doubling effect is an important means for obtaining visible light wavelength pulse laser, and is defined as that when incident electromagnetic wave passes through a nonlinear optical medium, the electromagnetic wave with the frequency twice that of the original frequency is generated, which is a common and important second-order nonlinear optical effect. The femtosecond ytterbium-doped fiber laser has higher competitive power than the traditional solid-state laser in the aspects of cost, space compactness and stability when obtaining frequency doubling pulses near 515nm wave bands, is one of important research directions in recent years, and the femtosecond pulse high-power green laser obtained by the method gradually meets the commercial and industrial requirements. However, the current femtosecond fiber laser has the problems of complex structure for adjusting the frequency doubling efficiency and the frequency doubling efficiency to be improved.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a femto second fiber laser to there is the structure complicacy of adjusting frequency doubling efficiency and the problem that frequency doubling efficiency remains to be improved in the present femto second fiber laser of solving.
The utility model provides a technical scheme as follows:
the embodiment of the utility model provides a first aspect provides a femto second fiber laser, include: a seed source, a first transmission grating pair, an ytterbium-doped fiber amplifier, a pulse compression system and a frequency doubling filter system which are arranged in sequence, wherein,
the seed source outputs mode locking pulses to the first transmission grating pair;
the first transmission grating pair comprises two transmission gratings, the distance between the two transmission gratings is adjustable, and positive chirp is introduced to the mode locking pulse by the first transmission grating pair to obtain the mode locking pulse with the positive chirp;
the ytterbium-doped fiber amplifier amplifies the mode locking pulse with the positive chirp to obtain an amplified mode locking pulse;
the pulse compression system compresses the amplified mode locking pulse to obtain a compressed mode locking pulse;
and the frequency doubling filtering system performs frequency doubling filtering on the compressed mode locking pulse to output a femtosecond laser pulse.
The embodiment of the utility model provides a femto second fiber laser through setting up kind of source, first transmission grating right, mixing ytterbium fiber amplifier, pulse compression system and doubling of frequency filtering system, can realize introducing what of positive chirp volume through the interval regulation that adjusts first transmission grating right to the non-linear effect of regulation and control in the amplification process optic fibre obtains different doubling of frequency efficiency from spectrum compression effect and the pulse width change that phase modulation arouses, and then realizes the optimization of doubling of frequency efficiency.
With reference to the first aspect, in a second embodiment of the first aspect, the ytterbium-doped fiber amplifier includes: a collimator, a first optical fiber isolator, a semiconductor laser, a beam combiner, a first polarization-preserving ytterbium-doped optical fiber and a second optical fiber isolator which are arranged in sequence,
the collimator receives the mode-locked pulse with the positive chirp output by the first transmission grating pair, the collimator couples the mode-locked pulse with the positive chirp to the first fiber isolator, the first fiber isolator outputs the mode-locked pulse with the positive chirp to the beam combiner, the pump light generated by the semiconductor laser is output to the beam combiner, the beam combiner couples the mode-locked pulse with the positive chirp and the pump light to output the coupled mode-locked pulse, the coupled mode-locked pulse is amplified by the first polarization ytterbium-doped fiber to output the amplified mode-locked pulse, and the amplified mode-locked pulse is output to the pulse compression system by the second fiber isolator.
In this embodiment, the collimator, the first fiber isolator, the semiconductor laser, the beam combiner, the first polarization-maintaining ytterbium-doped fiber, and the second fiber isolator are disposed in the ytterbium-doped fiber amplifier, so that the mode-locked pulse with the positive chirp is amplified to obtain the amplified mode-locked pulse.
In combination with the first aspect, in a third embodiment of the first aspect, the pulse compression system includes: a second reflecting mirror, a second transmission grating pair and a first reflecting mirror which are arranged in sequence,
and the amplified mode locking pulse passes through the second transmission grating pair and then is reflected by the first reflector, and then passes through the second transmission grating pair again to obtain a compressed mode locking pulse, and the compressed mode locking pulse is reflected to the frequency doubling filtering system by the second reflector.
The embodiment can reduce the pulse width, improve the peak power of the pulse, adjust the space between the two transmission gratings, adjust the pulse width of the amplified mode-locked pulse, further adjust the frequency doubling efficiency and improve the precision of the optimized frequency doubling efficiency by arranging the second transmission grating pair in the pulse compression system to compress the amplified mode-locked pulse.
With reference to the first aspect, in a fourth embodiment of the first aspect, the frequency multiplication filtering system includes: third speculum, first one-half wave plate, concave lens, first convex lens, second convex lens, lithium niobate frequency doubling crystal, third convex lens and the filter that sets gradually, the corresponding optical axis of mode locking pulse reflection after the third speculum will compress is passed through first one-half wave plate matching, then passes through concave lens and first convex lens increase pulse width in proper order, focuses on the lithium niobate frequency doubling crystal through second convex lens and third convex lens again and carries out the frequency doubling, at last generates femto second laser pulse through the filter.
The embodiment of the utility model provides a through set gradually the third speculum in doubling of frequency filtering system, first one-half wave plate, concave lens, first convex lens, second convex lens, lithium niobate doubling of frequency crystal, third convex lens and filter plate, utilize concave lens and first convex lens increase facula, recycle second convex lens and third convex lens and focus on lithium niobate doubling of frequency crystal with the facula, can improve frequency doubling efficiency, utilize the unnecessary light of filter plate filtering, avoid disturbing.
With reference to the first aspect, the first embodiment of the first aspect, the second embodiment of the first aspect, the third embodiment of the first aspect, and the fourth embodiment of the first aspect, in a fifth embodiment of the first aspect, the wavelength band of the amplified mode-locked pulse includes 1010-1050nm.
With reference to the first aspect, the first embodiment of the first aspect, the second embodiment of the first aspect, the third embodiment of the first aspect, and the fourth embodiment of the first aspect, in a sixth embodiment of the first aspect, a wavelength band of the femtosecond laser pulses includes 500-530nm.
In a seventh embodiment of the first aspect, in combination with the second embodiment of the first aspect, the semiconductor laser generates pump light by unidirectional pumping with 1 976nm multimode fiber diode.
With reference to the first aspect, the first embodiment of the first aspect, the second embodiment of the first aspect, the third embodiment of the first aspect, and the fourth embodiment of the first aspect, in an eighth embodiment of the first aspect, the ruling density of the first transmission grating pairs is 1000 lines per millimeter.
The embodiment of the utility model provides a first transmission grating is to selecting the transmission grating that the groove density is 1000 lines per millimeter, can provide suitable negative dispersion for obtaining near 515 nm's femtosecond pulse laser.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a femtosecond fiber laser according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a femtosecond fiber laser according to another embodiment of the present invention;
fig. 3 is a flowchart of a femtosecond fiber laser regulation and control method according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a femto second fiber laser, as shown in figure 1, include: a seed source 1, a first transmission grating pair 2, an ytterbium-doped fiber amplifier 3, a pulse compression system 4 and a frequency doubling filter system 5 which are arranged in sequence, wherein,
the seed source 1 outputs mode-locked pulses to the first transmission grating pair 2. Specifically, the seed source is used for outputting mode locking pulses, and mode locking is a technology for generating laser pulses with a very short time in optics, and the length of the pulses is usually picoseconds or even femtoseconds.
The first transmission grating pair 2 includes two transmission gratings, which are optical elements that disperse the composite light. The distance between the two transmission gratings is adjustable, and the first transmission grating introduces positive chirp to the mode-locked pulse to obtain the mode-locked pulse with the positive chirp. Specifically, the first transmission grating pair includes two transmission gratings, and a pitch of the two transmission gratings is adjustable. Chirp is caused by dispersion, and is represented by no change in amplitude of frequency components of an optical signal, but a change in phase of each frequency. The first transmission grating pair provides negative dispersion, positive chirp is further introduced to the mode locking pulse, the pulse width of the mode locking pulse is reduced, the chirp quantity of the mode locking pulse with the positive chirp can be adjusted by adjusting the distance between the two transmission gratings, and the smaller the distance between the grating pairs is, the smaller the positive chirp quantity is introduced to the mode locking pulse.
The ytterbium-doped fiber amplifier 3 amplifies the mode-locked pulse with the positive chirp to obtain an amplified mode-locked pulse. Specifically, the ytterbium-doped fiber amplifier is an optical device capable of amplifying power of an optical signal, and is used for amplifying a mode-locked pulse with positive chirp.
And the pulse compression system 4 compresses the amplified mode locking pulse to obtain a compressed mode locking pulse. Specifically, the pulse compression system is used for compressing the amplified mode-locked pulse, so that the peak power of the amplified mode-locked pulse is improved, and the pulse width of the amplified mode-locked pulse is reduced.
And the frequency doubling filtering system 5 performs frequency doubling filtering on the compressed mode locking pulse to output a femtosecond laser pulse. Specifically, when an incident electromagnetic wave passes through the nonlinear optical medium, an electromagnetic wave with a frequency twice that of the original frequency is generated, in an embodiment, the nonlinear optical medium may be a periodically polarized lithium niobate frequency doubling crystal, and the compressed mode locking pulse is frequency-doubled by the periodically polarized lithium niobate frequency doubling crystal and then unwanted light is filtered out to obtain a femtosecond laser pulse.
The embodiment of the utility model provides a femto second fiber laser, through setting up seed source 1, first transmission grating to 2, mix ytterbium fiber amplifier 3, pulse compression system 4 and doubling filter system 5, can realize introducing what of positive chirp volume through adjusting the interval adjustment of first transmission grating to 2 to the regulation and control spectrum compression effect and the pulse width change that nonlinear effect in the amplification process optic fibre arouses from phase modulation obtain different doubling of frequency efficiency, and then optimize doubling of frequency efficiency according to the regulation and control result.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the ytterbium-doped fiber amplifier 3 includes: the optical fiber coupling device comprises a collimator 31, a first optical fiber isolator 32, a semiconductor laser 33, a beam combiner 34, a first polarization-preserving ytterbium-doped optical fiber 35 and a second optical fiber isolator 36 which are sequentially arranged, wherein the collimator 31 receives a mode locking pulse with positive chirp output by a first transmission grating pair 2, the collimator 31 couples the mode locking pulse with the positive chirp to the first optical fiber isolator 32, the first optical fiber isolator 32 outputs the mode locking pulse with the positive chirp to the beam combiner 34, pump light generated by the semiconductor laser 33 is output to the beam combiner 34, the beam combiner 34 couples the mode locking pulse with the positive chirp and the pump light and outputs the coupled mode locking pulse, the coupled mode locking pulse is amplified by the first polarization-preserving ytterbium-doped optical fiber 35 and outputs the amplified mode locking pulse, and the amplified mode locking pulse is output to a pulse compression system 4 by the second optical fiber isolator 36.
Specifically, the optical fiber isolator can be used to avoid the decrease of the spectral purity of the light source due to the influence of the reflected backward light, the semiconductor laser 33 can be pumped by adopting a unidirectional pumping mode of 1 976nm multimode fiber diode, the amplified mode-locked pulse band comprises 1010-1050nm, for example, the amplified mode-locked pulse wavelength is 1030nm.
In this embodiment, the collimator 31, the first fiber isolator 32, the semiconductor laser 33, the beam combiner 34, the first polarization-maintaining ytterbium-doped fiber 35, and the second fiber isolator 36 are disposed in the ytterbium-doped fiber amplifier 3, so that the mode-locked pulse with positive chirp is amplified to obtain the amplified mode-locked pulse.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the pulse compression system 4 includes: the second reflector 41, the second transmission grating pair 42 and the first reflector 43 are sequentially arranged, the amplified mode locking pulse passes through the second transmission grating pair 42 and then is reflected by the first reflector 43, the amplified mode locking pulse passes through the second transmission grating pair 42 again to obtain a compressed mode locking pulse, and the compressed mode locking pulse is reflected to the frequency doubling filter system 5 by the second reflector.
Specifically, the second transmission grating pair 42 includes two transmission gratings, the second transmission grating pair 42 provides negative dispersion to the amplified mode-locked pulse to achieve compression, the distance between the two transmission gratings is adjustable to adjust the pulse width of the amplified mode-locked pulse, and the reflection angles of the first mirror 43 and the second mirror 41 can be set as required, for example, the reflection angles of the first mirror 43 and the second mirror 41 are set to be 0 °, 10 °, 20 °, 45 °, and the like. The reflector can change the propagation direction of light, thereby reducing the volume of the laser.
This embodiment is through setting up the mode locking pulse compression of second transmission grating pair 42 after to enlargeing in pulse compression system 4, can reduce pulse width, promotes the peak power of pulse, adjusts the pulse width that mode locking pulse after two transmission gratings's interval can also adjust the enlargeing, further adjusts frequency doubling efficiency, improves the precision of optimizing frequency doubling efficiency.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the frequency doubling filter system 5 includes: the third reflector 51 reflects the compressed mode locking pulse, then the mode locking pulse is matched with a corresponding optical axis through the first half wave plate 52, then the pulse width is increased through the concave lens 53 and the first convex lens 54 in sequence, and then the mode locking pulse is focused on the lithium niobate frequency doubling crystal 56 for frequency doubling through the second convex lens 55 and the third convex lens 57, and finally the femtosecond laser pulse is generated through the filter 58.
Specifically, the reflection angle of the third reflecting mirror 51 may be set as needed, for example, the reflection angle of the third reflecting mirror 51 is set to 0 °, 10 °, 20 °, 45 °, or the like. The light spot can be enlarged by increasing the pulse width using the concave lens 53 and the first convex lens 54; and then focusing the light spot on a lithium niobate frequency doubling crystal 56 by using a second convex lens 55 and a third convex lens 57, and doubling the frequency of the compressed mode locking pulse by using a frequency doubling effect. The unwanted light is filtered out by means of a filter 58. The wavelength band of the femtosecond laser pulses comprises 500-530nm, for example, the wavelength of the femtosecond laser pulses is 515nm.
The embodiment of the utility model provides a through set gradually third speculum 51 in doubling frequency filtering system 5, first one-half wave plate 52, concave lens 53, first convex lens 54, second convex lens 55, lithium niobate doubling of frequency crystal 56, third convex lens 57 and filter 58, utilize concave lens 53 and first convex lens 54 increase facula, recycle second convex lens 55 and third convex lens 57 and focus on lithium niobate doubling of frequency crystal 56 with the facula, can improve doubling of frequency efficiency, utilize the unnecessary light of filtering of filter 58, avoid disturbing.
As an optional implementation manner of the embodiment of the present invention, the groove density of the first transmission grating pair 2 is 1000 lines per millimeter. Specifically, denser reticle densities provide greater dispersion.
The embodiment of the utility model provides a first transmission grating is the transmission grating of 1000 lines per millimeter through selecting the groove density to 2, can provide suitable negative dispersion for obtaining near 515nm wavelength femtosecond pulse laser.
In one embodiment, as shown in fig. 2, the femtosecond fiber laser includes a seed source 1, a first transmission grating pair 2, a collimator 31, a first fiber isolator 32, a semiconductor laser 33, a beam combiner 34, a first polarization-preserving ytterbium-doped fiber 35, a second fiber isolator 36, a second mirror 41, a second transmission grating pair 42, a first mirror 43, a third mirror 51, a first quarter wave plate 52, a concave lens 53, a first convex lens 54, a second convex lens 55, a lithium niobate frequency doubling crystal 56, a third convex lens 57, and a filter 58, which are sequentially arranged.
The seed source 1 outputs a mode locking pulse to a first transmission grating pair 2, the first transmission grating pair 2 introduces positive chirp to the mode locking pulse, outputs the mode locking pulse with the positive chirp to a collimator 31, the collimator 31 couples the mode locking pulse with the positive chirp to a first optical fiber isolator 32, the first optical fiber isolator 32 outputs the mode locking pulse with the positive chirp to a beam combiner 34, pump light generated by a semiconductor laser 33 is output to the beam combiner 34, the beam combiner 34 couples the mode locking pulse with the positive chirp and the pump light to output the coupled mode locking pulse, the coupled mode locking pulse is amplified by a first polarization-maintaining ytterbium-doped optical fiber 35 to output the amplified mode locking pulse, the amplified mode locking pulse is output to a second transmission grating pair 42 by a second optical fiber isolator 36, the amplified mode locking pulse passes through the second transmission grating pair 42, then is reflected by a first reflector 43, then passes through the second transmission grating pair 42 to obtain a compressed mode locking pulse, the compressed mode locking pulse is reflected to a third reflector 51, the third reflector 51 compresses one of the mode locking pulse, the compressed mode locking pulse passes through a second reflector 51, the second reflector 53, and a third reflector 55, and a third reflector 54 sequentially pass through a second reflector, and a second reflector 55, and a convex lens, and a third reflector 54.
The embodiment of the utility model provides a femtosecond fiber laser regulation and control method is still provided, as shown in fig. 3, be applied to above-mentioned any embodiment femtosecond fiber laser, this method includes:
s101, receiving a mode locking pulse; specifically, an input mode-locked pulse is received, for example, a mode-locked pulse input by a seed source.
And S102, adjusting the positive chirp quantity of the mode-locked pulse by adjusting the distance of the first transmission grating pair to obtain the mode-locked pulse with different positive chirp quantities. Specifically, the positive chirp amount of the mode-locked pulse can be adjusted by adjusting the distance between the first transmission grating pair, so that the mode-locked pulses with different positive chirp amounts are obtained.
And S103, amplifying, compressing and frequency doubling the mode-locked pulses with different chirp amounts to obtain femtosecond laser pulses. Specifically, ytterbium-doped fiber amplifiers can be used for amplifying the mode-locked pulses with different chirp amounts; compressing the pulses can reduce pulse width and light spot, and a transmission grating pair can be used; frequency doubling of the pulses allows for the selection of nonlinear optical media.
The embodiment of the utility model provides a through adjusting the mode locking pulse that the interval that first transmission grating is right obtains different positive chirp volume, obtains the femtosecond laser pulse that has different frequency multiplication efficiency after enlarging, compressing and doubling of frequency with the mode locking pulse of different positive chirp volume, and then realizes the optimization of frequency multiplication efficiency.
Although exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions and alterations to these embodiments without departing from the spirit of the invention and the scope of protection defined by the appended claims, and such changes and alterations are intended to fall within the scope of protection defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (8)
1. A femtosecond fiber laser comprising: a seed source, a first transmission grating pair, an ytterbium-doped fiber amplifier, a pulse compression system and a frequency doubling filter system which are arranged in sequence, wherein,
the seed source outputs mode locking pulses to the first transmission grating pair;
the first transmission grating pair comprises two transmission gratings, the distance between the two transmission gratings is adjustable, and positive chirp is introduced to the mode locking pulse by the first transmission grating pair to obtain the mode locking pulse with the positive chirp;
the ytterbium-doped fiber amplifier amplifies the mode locking pulse with the positive chirp to obtain an amplified mode locking pulse;
the pulse compression system compresses the amplified mode locking pulse to obtain a compressed mode locking pulse;
and the frequency doubling filtering system performs frequency doubling filtering on the compressed mode locking pulse to output a femtosecond laser pulse.
2. The femtosecond fiber laser of claim 1, wherein the ytterbium-doped fiber amplifier comprises: a collimator, a first optical fiber isolator, a semiconductor laser, a beam combiner, a first polarization-preserving ytterbium-doped optical fiber and a second optical fiber isolator which are arranged in sequence,
the collimator receives the mode-locked pulse with the positive chirp output by the first transmission grating pair, the collimator couples the mode-locked pulse with the positive chirp to the first fiber isolator, the first fiber isolator outputs the mode-locked pulse with the positive chirp to the beam combiner, the pump light generated by the semiconductor laser is output to the beam combiner, the beam combiner couples the mode-locked pulse with the positive chirp and the pump light to output the coupled mode-locked pulse, the coupled mode-locked pulse is amplified by the first polarization ytterbium-doped fiber to output the amplified mode-locked pulse, and the amplified mode-locked pulse is output to the pulse compression system by the second fiber isolator.
3. The femtosecond fiber laser according to claim 1, wherein the pulse compression system comprises: a second reflecting mirror, a second transmission grating pair and a first reflecting mirror which are arranged in sequence,
and the amplified mode locking pulse passes through the second transmission grating pair, then is reflected by the first reflector, passes through the second transmission grating pair again to obtain a compressed mode locking pulse, and the compressed mode locking pulse is reflected to the frequency doubling filtering system by the second reflector.
4. The femtosecond fiber laser of claim 1 wherein the frequency doubling filter system comprises: a third reflector, a first half wave plate, a concave lens, a first convex lens, a second convex lens, a lithium niobate frequency doubling crystal, a third convex lens and a filter plate which are arranged in sequence,
and the third reflector reflects the compressed mode locking pulse, then the mode locking pulse is matched with a corresponding optical axis through the first half wave plate, then the mode locking pulse sequentially passes through the concave lens and the first convex lens to increase the pulse width, and is focused on the lithium niobate frequency doubling crystal through the second convex lens and the third convex lens to carry out frequency doubling, and finally the femtosecond laser pulse is generated through the filter.
5. A femtosecond fiber laser according to any one of claims 1 to 4, wherein a wavelength band of the amplified mode-locked pulse includes 1010-1050nm.
6. A femtosecond fiber laser according to any one of claims 1 to 4, wherein a wavelength band of the femtosecond laser pulses comprises 500-530nm.
7. The femtosecond fiber laser as claimed in claim 2, wherein the semiconductor laser generates the pump light by unidirectional pumping of 1 976nm multimode fiber diode.
8. The femtosecond fiber laser according to any one of claims 1 to 4, wherein a groove density of the first transmission grating pair is 1000 lines per millimeter.
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