CN105048266A - Laser diode (LD) pumping laser amplifier and laser amplification method - Google Patents
Laser diode (LD) pumping laser amplifier and laser amplification method Download PDFInfo
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Abstract
The invention relates to the technical field of laser amplification and compensation, and particularly discloses a laser diode (LD) pumping laser amplifier and a laser amplification method. The LD pumping laser amplifier disclosed by the invention comprises a first laser module, a first depolarization compensation rotor, a first image transfer lens, a second image transfer lens, a second depolarization compensation rotor and a second laser module, which are sequentially arranged along the laser transfer direction, wherein the first laser module and the second laser module comprise working materials which are the same in diameter, length and doping concentration, and have the same pumping mode; the first depolarization compensation rotor and the second depolarization compensation rotor are quartz rotors of 45 degrees; and the first image transfer lens and the second image transfer lens have the focuses which are overlapped with each other. The invention further provides a laser amplification method. According to the LD pumping laser amplifier and the laser amplification method provided by the invention, depolarization compensation is accurate; and adaptation to varying of the environment temperature in a large range can be realized.
Description
Technical field
The present invention relates to laser amplifier, compensation technique field, particularly a kind of LD pump laser amplifier and laser amplification method.
Background technology
Laser amplifier refers to the stimulated radiation principle utilizing light, carries out the device that injection laser energy (power) is amplified.By adopting laser amplifier, can when obtaining high laser energy or power and the beam quality (comprising pulsewidth, live width, polarization characteristic etc.) that kept.Therefore laser amplifier is the core component of high-energy (power) laser.
In existing patent, the patent for laser amplifier is a lot.Such as utility model patent CN201120237854.3, has set forth a kind of laser amplifier equipment and the laser system with this equipment.Wherein, described laser amplifier equipment comprises multiple laser amplifier group, each laser amplifier group comprises one or more laser amplifier, the laser amplifier cross arrangement of different group, also comprise the control chip be connected with all laser amplifiers, this control chip controls described each group of amplifier in different time sections work.Patent of invention CN201110136440.6 relates to a kind of device improving lamp pumping image intensifer operating frequency, makes laser enter multiple lamp pumping image intensifer successively to improve operating frequency by coordinating of rotating mirror and stationary mirror.This device simplifies mechanical device, and its single unit system little cost that takes up space is low.
LD pumping laser (semiconductor laser) is a kind of laser that conventional lights pumping laser develops, compare traditional lamp pumping laser, its optical mode is better, structure is smaller and more exquisite, there is the trend of alternative conventional lights pumping laser, but use at industrial circle as a kind of common lasers, low price, be the scope of being commonly employed as general mark.There is in view of LD pumping high-peak power, high stability, high light beam quality tune Q and mode-locked laser the plurality of advantages such as volume is little, lightweight, sound construction, life-span length, have in each fields such as industry, communication, military affairs, medical treatment and generally apply.
When adopting LD (LaserDiode) pumping, usually adopt the pump light of coupling absworption peak centre wavelength to carry out pumping, but in which, ignore the spectrum-power distribution properties of pump light.Such as typical 808.6nm absworption peak, the wavelength of centre wavelength near this spike is selected to carry out pumping, as shadow region in the middle of Fig. 1.Because LD exists the drift characteristic of the corresponding 1nm centre wavelength of 3 DEG C of water temperatures, and the absworption peak width of the crystalline materials such as Nd:YAG is less than 1nm usually, when temperature significantly changes, centre wavelength will depart from absworption peak, this can make the distribution of the pump energy of laser in crystal, energy storage changes, and causes laser amplifier job insecurity.
Summary of the invention
The present invention is intended to overcome in prior art, depolarization compensation inaccuracy, can not adapt to the technical problem of large temperature difference variation, provide a kind of depolarization compensation accurately, LD pump laser amplifier that ambient temperature wide variation is adapted to and laser amplification method can be realized.
For achieving the above object, the present invention is by the following technical solutions:
On the one hand, the invention provides a kind of LD pump laser amplifier, comprise the first laser module, the first depolarization compensation rotor, the first Image relaying lens, the second Image relaying lens, the second depolarization compensation rotor and the second laser module that are arranged in order along laser transfer direction; Described first laser module and the second laser module have the operation material of same diameter, length and doping content; Described first laser module and the second laser module have identical pump mode; Described first depolarization compensation rotor and the second depolarization compensation rotor are the quartzy rotor of 45 degree; First Image relaying lens and the second Image relaying lens have the focus overlapped, the centre position of described focus between the first Image relaying lens and the second Image relaying lens, described first laser module and the second laser module are about described focus center symmetry, described first depolarization compensation rotor and the second depolarization compensation rotor are about described focus center symmetry, and described first Image relaying lens and the second Image relaying lens are about described focus center symmetry.
In some embodiments, described first laser module and the second laser module are side pumping module.
Preferably, described side pumping module is for fold front's array circle distribution around crystal pumping by several semiconductors.
In some embodiments, the set of lenses that described first Image relaying lens and the second Image relaying lens are one piece of convex lens or are made up of multiple lens.
In some embodiments, described first Image relaying lens and the second Image relaying lens are spherical lens.
In some embodiments, described first laser module is identical with the doping ionic species of the second laser module.
In some embodiments, described first laser module is identical with pump power with the pumping configuration of the second laser module.
In some embodiments, pumping pulse width, the repetition rate of described first laser module and the second laser module are identical.
On the other hand, the invention provides a kind of laser amplification method based on above-mentioned LD pump laser amplifier, laser is tested, calculates, obtain default pump energy density profile; Control the power output of the first laser module and the second laser module, make the power output of the first laser module and the second laser module than the strength ratio equaling two spikes in described default pump energy density profile; Laser exports successively after the first laser module, the first depolarization compensation rotor, the first Image relaying lens, the second Image relaying lens, the second depolarization compensation rotor and the second laser module.
In some embodiments, to the first laser module and the second laser module loading current simultaneously, and open simultaneously or close.
In some embodiments, control the coolant water temperature of the first laser module and the second laser module, make the consistent wavelength of two spikes in the center operating wavelength of the center operating wavelength of the first laser module and the second laser module and described default pump energy density profile.
In some embodiments, control the loading current intensity of the first laser module and the second laser module, and then realize the control of the power output to the first laser module and the second laser module.
Beneficial effect of the present invention is: the module pair of the first laser module and the second laser module composition, can export specific power output, finally realize predetermined pump energy density profile, realizes the effective absorption coefficient distribution of flat-top thus.And the effective absorption coefficient of flat-top distribution will make when drift occurs wavelength, the distribution of pump energy density will keep stable, and then realize the adaptation of large temperature range.In addition, by the deflection system that the first depolarization compensation rotor and the second depolarization compensation rotor are formed, make the optical path difference of the first Image relaying lens and the second Image relaying lens, aberration symmetrical, compensate in existing depolarization compensation scheme, adopt one block of 90 degree of quartzy rotor to compensate, both sides light path is inconsistent, compensates coarse problem, Image relaying can be realized more accurately, better can compensate fevering sodium effect.
Accompanying drawing explanation
Fig. 1 is the absorption spectrum of Nd:YAG, and the typical coverage area schematic diagram of LD spectrum.
Fig. 2 is LD energy-spectral distribution curve figure that experiment test obtains.
Fig. 3 is the effective absorption spectrum schematic diagram calculated for LD energy-spectral distribution; Comprise Nd:YAG absorption spectrum and effective absorption spectrum.
Fig. 4 is by the effective absorption spectrum of flat-top of realization and default pump energy density profile schematic diagram; Comprise default pump energy density profile, Nd:YAG absorption spectrum, effectively absorption spectrum.
Fig. 5 is LD pump laser amplifier composition schematic diagram.
Fig. 6 is the Image relaying schematic diagram of LD pump laser amplifier.
Fig. 7 is laser output spectrum after LD pump laser amplifier of the present invention amplifies and compensates Overlay figure.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and be not construed as limiting the invention.
As shown in Figure 5 and Figure 6, the invention provides a kind of LD pump laser amplifier, comprise the first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the second laser module 2 be arranged in order along laser transfer direction.In Fig. 5, the direction of transfer of laser is from left to right; Certainly, if laser transfer direction is also feasible from right to left, as long as exchanged by the Reference numeral of each parts.Fig. 5 is only used to the composition that LD pump laser amplifier of the present invention is described, just one embodiment of the present of invention and a kind of Reference numeral mode, do not form limiting to the claimed invention.
Simultaneously, above-mentioned " being arranged in order " just expression first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the second laser module 2 receives the order of laser successively, characterizes the front and back position Rankine-Hugoniot relations of the first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the second laser module 2 with the pass order of this laser.Here the restriction to the first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the concrete locus of the second laser module 2 is not formed, also do not form the restriction of the particular location to each parts, mounting means, concrete installing space position, mounting means can realize the above-mentioned pass order of laser.Such as, direction setting is injected on a horizontal line in first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the center of the second laser module 2 and the light of laser, and such laser can transmit through the first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the second laser module 2 successively.
In LD pump laser amplifier provided by the invention, the first laser module 1 and the second laser module 2 have the operation material of same diameter, length and doping content.Above-mentioned operation material is for the operation material in LD pump laser amplifier, has following three features: 1. sharp-pointed fluorescent line; 2. strong absorption band that can be corresponding with LD luminescence spectrum; 3. for the quite high quantum efficiency of required fluorescent transition.Operation material conventional at present has Nd:YAG (neodymium-doped yttrium-aluminum garnet), Nd:YLF (lithium yttrium fluoride of Nd ion doped) and Nd:Glass (neodymium glass); Above-mentioned operation material is present in LD pump laser amplifier with the form of crystal (rod).Generally speaking, in the operation material in LD pump laser amplifier, all doping is had.In the present invention, in the operation material in the first laser module 1 and the second laser module 2, doping content is identical; Further, operation material is all present in the first laser module 1 and the second laser module 2 with the form of crystal bar, the operation material existed with the form of crystal bar, and its diameter, length (diameter and the length of crystal bar) are also identical.
In above-mentioned operation material, Nd:YAG crystal is one of solid laser medium invented the earliest, by the Nd of trivalent " mix in yttrium-aluminium-garnet; and alternative Y3+ ion obtains; belonging to cubic system; optically isotropism, is a kind of solid laser material the most frequently used at present, is also solid laser material the most ripe at present.The parameter of Nd:YAG crystal is particularly conducive to the generation of laser action: the first, and the absorption peak of active ions Nd3+ overlaps with GaAs diode emission standard spectrum, is very suitable for using LD pumping; The second, in Nd:YAG, the neodymium of trivalent substituted for the yttrium of trivalent, does not thus need compensation charge, and its cubic structure is also conducive to obtaining narrow fluorescent line, result in high-gain, Low threshold; Three, YAG matrix is very hard, mechanical strength is high, thermal conductivity good and have good optical quality.Except having superior spectroscopy and laser characteristic, also there is good Wuli-Shili-Renli system approach.Therefore, in specific embodiment hereafter, can Nd:YAG crystal bar be selected further to do concrete experiment and checking, no longer too much repeat at this.
In the present invention, the first laser module 1 and the second laser module 2 have identical pump mode, such as the end pumping mode of middle low power or for powerful profile pump mode.The simple pump beam of end pumping device mates with resonator mode well, and operation material is very abundant to Pumping light absorption; Thus valve value rate is low, and Slop efficiency is high.Profile pump refers to pump light pumped crystal rod from the side, and namely light is irradiated into crystal bar from the side.Generally for and obtain powerful Laser output, generally can adopt profile pump.
Further, in the present invention, the first depolarization compensation rotor 3 and the second depolarization compensation rotor 4 are the quartzy rotor of 45 degree.By the compensation of two quartzy rotors, the polarization state that can realize incident polarized light rotates.Deflection system is formed by the quartzy rotor of two pieces 45 degree, make the optical path difference of the first Image relaying lens 5 and the second Image relaying lens 6, aberration symmetrical, compensate in existing depolarization compensation scheme, when adopting one block of 90 degree of quartzy rotor to compensate, both sides light path is inconsistent, compensates coarse problem.Therefore the present invention can realize Image relaying more accurately, better compensates fevering sodium effect.
In the present invention, as shown in Figure 5 and Figure 6, first Image relaying lens 5 and the second Image relaying lens 6 have the focus overlapped, the centre position of this focus between the first Image relaying lens 5 and the second Image relaying lens 6, first laser module 1 and the second laser module 2 are about this focus center symmetry, first depolarization compensation rotor 3 and the second depolarization compensation rotor 4 are about described focus center symmetry, and the first Image relaying lens 5 and the second Image relaying lens 6 are about this focus center symmetry.As shown in Figure 5, the position that middle dash area intersects is above-mentioned focus, this focus is the common focus of the first Image relaying lens 5 and the second Image relaying lens 6, first laser module 1, first depolarization compensation rotor 3 and the first Image relaying lens 5 are positioned at the left side of this focus, and the second laser module 2, second depolarization compensation rotor 4 and the second Image relaying lens 6 are positioned at the right side of focus.As can be seen from accompanying drawing 5, identical module all about above-mentioned focus symmetrical (with the plane of accompanying drawing 5 for reference), reality i.e. Central Symmetry; Certainly, in fact consider the stereoscopic mechanism of each parts, then above-mentioned Central Symmetry is all right understanding of.
Concrete, the Image relaying schematic diagram of LD pump laser amplifier of the present invention as shown in Figure 6, F11 and F12 is the focus of the first Image relaying lens 5, F21 and F22 is the focus of the second Image relaying lens 6, wherein focal point F 12 and F22 are on a point, the focus in the centre position namely between the first Image relaying lens 5 and the second Image relaying lens 6 is the focus that the first Image relaying lens 5 and the second Image relaying lens 6 overlap, the namely coincidence focus of F12 and F22.In addition, in Fig. 6, F1 and F2 represents the first Image relaying lens in the present invention and the second Image relaying lens.
LD pump laser amplifier provided by the invention, can pass through the power stage of control first laser module 1 and the second laser module 2, make it meet default pump energy density profile, realizes the effective absorption coefficient distribution of flat-top thus.And then making when drift occurs system wavelength, the distribution of pump energy density can keep stable, realizes the adaptation of the temperature difference on a large scale.
In one embodiment of the present of invention, in order to obtain powerful Laser output, what the first laser module 1 and the second laser module 2 adopted is side pumping module.
Further, in one embodiment of the present of invention, side pumping module is for fold front's array circle distribution around crystal pumping by several semiconductors.Usually, in order to obtain powerful Laser output, the left pump light source of general employing semi-conductor array, because the light-emitting area of array is larger, laser is transmitted by side total reflection in operation material, make it be greater than the contour length of operation material by the effective length of gain media, thus obtain high-power output.
In some embodiments of the invention, the first Image relaying lens 5 and the second Image relaying lens 6 set of lenses that can be one piece of convex lens or be made up of multiple lens; Such as can form a set of lenses by 2 to 4 lens.In the present invention, the first Image relaying lens 5 and the second Image relaying lens 6, achieve fourier images propagation function, can being imaged onto the energy-distributing feature salt free ligands of the first laser module 1 in the second laser module 2, and form depolarization compensation thus.
Further, the first Image relaying lens 5 and the second Image relaying lens 6 can be spherical lenses, also can be non-spherical lenses, preferred spherical lens.
In one embodiment of the present of invention, the first laser module 1 is identical with the doping ionic species of the second laser module 2.According to above-mentioned, generally, the ion of doping is neodymium ion.
In one embodiment of the present of invention, the first laser module 1 is identical with pump power with the pumping configuration of the second laser module 2.Close energy storage, gain amplifying power can be realized thus.
In an alternative embodiment of the invention, pumping pulse width, the repetition rate of the first laser module 1 and the second laser module 2 are identical.Add the step of loading current, open and close simultaneously simultaneously, realize the control to whole system.
In addition, present invention also offers a kind of laser amplification method based on above-mentioned LD pump laser amplifier, first laser tested, calculate, obtain default pump energy density profile; Control the power output of the first laser module 1 and the second laser module 2 again, make the power output of the first laser module 1 and the second laser module 2 than the strength ratio equaling two spikes in default pump energy density profile.After having set, open the first laser module 1 and the second laser module 2, laser exports successively after the first laser module 1, first depolarization compensation rotor 3, first Image relaying lens 5, second Image relaying lens 6, second depolarization compensation rotor 4 and the second laser module 2.
Preset the acquisition of pump energy density profile: provide the absorption spectrum of operation material and the typical coverage area schematic diagram of LD spectrum; Test obtains LD energy-spectral distribution curve figure by experiment; By the absorption Spectrum characteristic of LD spectrum-power distribution properties in conjunction with operation material, calculate effective absorption spectrum; Then effective absorption spectrum is optimized, obtains flat-top and to distribute effective absorption spectrum and default pump energy density profile.Specifically as accompanying drawing 1,2, shown in 3 and 4, for the LD energy-spectral distribution curve of Fig. 2, the absorption spectrum of the operation material (Nd:YAG) of composition graphs 1, can calculate the effective absorption spectrum shown in Fig. 3.Effective absorption spectrum can react the pump energy absorbing state of operation material, is flat-top distribution, and then obtains the effective absorption spectrum of flat-top shown in Fig. 4 and default pump energy density profile by optimizing this effective absorption spectrum.
First laser module 1 and the second laser module 2 comprising modules pair of the present invention, individually can export specific pumping centre wavelength, realize certain power export ratio, make the ratio of both power outputs identical with the strength ratio of two spikes in default pump energy density profile.The pump energy density distribution that pump energy density profile calculates is preset in final realization, then according to above-mentioned result of calculation, the terrace effective absorption coefficient distribution of shape.
Above-mentioned first laser module 1 and the second laser module 2 loading current simultaneously, and close simultaneously or open.
In said method, the coolant water temperature of control first laser module 1 and the second laser module 2 can be passed through, make the consistent wavelength of two spikes in the center operating wavelength of the center operating wavelength of the first laser module 1 and the second laser module 2 and default pump energy density profile.In the present invention, by accurately controlling above-mentioned coolant water temperature, realizing departing from of centre wavelength, ensureing the consistent wavelength of two spikes in itself and default pump energy density profile.That is, during the LD pump energy after ensureing it and optimizing distributes, specific pumping centre wavelength matches.
In one embodiment of the present of invention, by controlling the loading current intensity of the first laser module 1 and the second laser module 2, and then realize the control of the power output to the first laser module 1 and the second laser module 2.Namely the adjustment of power output is by the control realization to loading current, thus the power output ratio achieving the first laser module 1 and the second laser module 2 is consistent with the strength ratio of two spikes in default pump energy density profile.
Embodiment 1
Make a LD pump laser amplifier provided by the invention as shown in Figure 5, in the present embodiment, operation material is Nd:YAG.Further, obtained the absorption spectrum of Nd:YAG as shown in Figure 1 by test, and test the LD energy-spectral distribution curve obtained as shown in Figure 2 by experiment; The absorption spectrum of the Nd:YAG of Fig. 1 is combined with the LD energy-spectral distribution curve of Fig. 2, calculates the effective absorption spectrum shown in Fig. 3; This effective absorption spectrum is optimized, makes it become flat-top distribution, obtain the effective absorption spectrum of flat-top shown in Fig. 4 and default pump energy density distribution curve.
In the present embodiment, the laser be exaggerated is produced by a nanosecoud pulse laser, and pulse duration is 15ns, and pulse repetition frequency is 100Hz, and single pulse energy is 100mJ.The Nd:YAG crystal bar diameter of the first laser module 1 and the second laser module 2 is 8mm, length is 100mm, and the doping content of operation material and Nd:YAG is 0.5%.Wherein, the first laser module 1 and the second laser module 2 are side pumping module, and fold front's array circle distribution around crystal pumping by 5 semiconductors respectively, front's array average power folded by the semiconductor in each module is 150W.First depolarization compensation rotor 3 and the second depolarization compensation rotor 4 for thickness be 5mm, diameter is the quartz plate of 30mm, constitute depolarization compensation rotor pair, first depolarization rotor 3 and the second depolarization rotor 4 are 45 degree, by the compensation of the first depolarization rotor 3 and the second depolarization rotor 4, the polarization state that can realize incident polarized light rotates.First Image relaying lens 5 and the second Image relaying lens 6 form by 2 planoconvex spotlights, and the focal length of 2 planoconvex spotlights is respectively 150mm and 200mm, and the spacing of 2 planoconvex spotlights is 50mm.
In the system composition of the present embodiment, the center of the first laser module 1 is 200mm to the distance of the first depolarization compensation rotor 3, and the distance of the first depolarization compensation rotor 3 to the first Image relaying lens 5 is 200mm; Spacing between first Image relaying lens 5 and the second Image relaying lens 6 is 363mm, the laser of parallel incidence converges in the middle of the first Image relaying lens 5 and the second Image relaying lens 6 just, i.e. the focus overlapped in the first Image relaying lens 5 and the second Image relaying lens 6 centre position.Relative to this focus, be centrosymmetricly placed with the second Image relaying lens 6, second depolarization compensation rotor 4 and the second laser module 2.
During work, the first laser module 1 is loaded to the electric current of 200A, realize the power stage of 140W; Second laser module 2 loads the electric current of 175A, realizes the power stage of 118W.The power output of the first laser module 1 and the second laser module 2 is than just equaling the strength ratio presetting two spikes in pump energy density profile in Fig. 4.And, be 22 DEG C by controlling the coolant water temperature of the first laser module 1, the coolant water temperature of the second laser module 2 is 26 DEG C, in conjunction with selected by laser diode characteristics, make the center operating wavelength of the first laser module 1 be 805.5nm, the center operating wavelength of the second laser module 2 is 809.3nm.With the consistent wavelength of two spikes in the default pump energy density profile in Fig. 4.So just make to be achieved through the default pump energy density distribution calculated in Fig. 4.
Laser is after LD pump laser amplifier amplifies, and namely its laser spectroscopy exported compensates Overlay as shown in Figure 7.When laser is after the first laser module 1 and the second laser module 2, be just equivalent to have passed in Fig. 4 and preset pump energy density profile, the effective absorption coefficient namely by having flat-top distribution amplifies.When temperature drift changes, within the scope of the 5nm that LD centre wavelength is corresponding from 806nm to 811nm, can not have a significant effect, be equivalent to make accurate adaptation to the variation of ambient temperature of 15 DEG C.In Fig. 77 represent formed after overcompensation laser spectroscopy distribution, 8 representative be Overlay figure.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.
Claims (12)
1. a LD pump laser amplifier, is characterized in that, comprises the first laser module, the first depolarization compensation rotor, the first Image relaying lens, the second Image relaying lens, the second depolarization compensation rotor and the second laser module that are arranged in order along laser transfer direction; Described first laser module and the second laser module have the operation material of same diameter, length and doping content; Described first laser module and the second laser module have identical pump mode; Described first depolarization compensation rotor and the second depolarization compensation rotor are the quartzy rotor of 45 degree; First Image relaying lens and the second Image relaying lens have the focus overlapped, the centre position of described focus between the first Image relaying lens and the second Image relaying lens, described first laser module and the second laser module are about described focus center symmetry, described first depolarization compensation rotor and the second depolarization compensation rotor are about described focus center symmetry, and described first Image relaying lens and the second Image relaying lens are about described focus center symmetry.
2. LD pump laser amplifier according to claim 1, is characterized in that, described first laser module and the second laser module are side pumping module.
3. LD pump laser amplifier according to claim 2, is characterized in that, described side pumping module is for fold front's array circle distribution around crystal pumping by several semiconductors.
4. LD pump laser amplifier according to claim 1, is characterized in that, the set of lenses that described first Image relaying lens and the second Image relaying lens are one piece of convex lens or are made up of multiple lens.
5. LD pump laser amplifier according to claim 1, is characterized in that, described first Image relaying lens and the second Image relaying lens are spherical lens.
6. LD pump laser amplifier according to claim 1, is characterized in that, described first laser module is identical with the doping ionic species of the second laser module.
7. LD pump laser amplifier according to claim 1, is characterized in that, described first laser module is identical with pump power with the pumping configuration of the second laser module.
8. LD pump laser amplifier according to claim 1, is characterized in that, pumping pulse width, the repetition rate of described first laser module and the second laser module are identical.
9. based on a laser amplification method for claim 1-8 any one LD pump laser amplifier, it is characterized in that, laser is tested, calculate, obtain default pump energy density profile; Control the power output of the first laser module and the second laser module, make the power output of the first laser module and the second laser module than the strength ratio equaling two spikes in described default pump energy density profile; Laser exports successively after the first laser module, the first depolarization compensation rotor, the first Image relaying lens, the second Image relaying lens, the second depolarization compensation rotor and the second laser module.
10. laser amplification method according to claim 9, is characterized in that, to the first laser module and the second laser module loading current simultaneously, and opens simultaneously or closes.
11. laser amplification methods according to claim 9, it is characterized in that, control the coolant water temperature of the first laser module and the second laser module, make the consistent wavelength of two spikes in the center operating wavelength of the center operating wavelength of the first laser module and the second laser module and described default pump energy density profile.
12. laser amplification methods according to claim 9, is characterized in that, control the loading current intensity of the first laser module and the second laser module, and then realize the control of the power output to the first laser module and the second laser module.
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| 秘国江: ""高重复频率大能量锁模激光器技术"", 《中国激光》 * |
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