CN108365515A - A kind of single-ended pumped high-power burst pulse basic mode laser and its working method - Google Patents
A kind of single-ended pumped high-power burst pulse basic mode laser and its working method Download PDFInfo
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- CN108365515A CN108365515A CN201810254769.4A CN201810254769A CN108365515A CN 108365515 A CN108365515 A CN 108365515A CN 201810254769 A CN201810254769 A CN 201810254769A CN 108365515 A CN108365515 A CN 108365515A
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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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0604—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium comprising a non-linear region, e.g. generating harmonics of the laser frequency
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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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
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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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
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Abstract
The present invention relates to a kind of single-ended pumped high-power burst pulse basic mode ultraviolet laser and its working methods.The laser includes pumping source, coupled lens group, planoconvex spotlight, laser crystal, Q-modulating device, the first flat mirror, frequency tripling crystal, frequency-doubling crystal and the second flat mirror；One end cut at Brewster angle of frequency tripling crystal.The present invention is designed using plano-convex V chambers, increases in resonant cavity utilizable inverted population in model volume and laser crystal.Meanwhile the design can compensate thermal lensing effect when high power operates so that laser is in steady area in high power, realizes the stable operation of laser under single-ended high power, reduces laser volume and chamber is long, is conducive to burst pulse output.The design of plano-convex chamber is conducive to that multimode is inhibited to generate, and has modeling effect, improves the beam quality of laser fundamental frequency light, frequency doubled light and ultraviolet light.
Description
Technical field
The present invention relates to a kind of single-ended pumped high-power burst pulse basic mode laser and its working methods, belong to Gao Zhongying arteries and veins
Rush the technical field of laser and nonlinear optical frequency conversion.
Background technology
The solid ultraviolet laser of end pumping is generally by semiconductor laser (Laser Diode, abbreviation LD)
Pump Nd:YVO4The gain medias such as crystal export fundamental frequency light, then carry out frequency multiplication, remaining fundamental frequency by frequency-doubling crystals such as LBO
Light is carried out by LBO etc. and frequency crystal with frequency doubled light and frequency, generates frequency tripling ultraviolet laser.Fundamental frequency light conversion generates ultraviolet light
There are mainly two types of modes：The outer frequency conversion of chamber is converted with intra-cavity frequency.The outer frequency conversion of chamber is to utilize focusing system by fundamental frequency light
It focuses in frequency conversion crystal.Focal point spot size is small, and power density is high, to improve frequency conversion efficiency.By setting
Condenser lens parameter, adjustment nonlinear crystal position are counted, nonlinear conversion efficiency can be optimized.But focal point hot spot is too small, work(
Rate density is excessively high, is easy to cause nonlinear frequency conversion lens lesion, influences the service life of laser, therefore cavity external frequency multiplication pair
The antibody Monoclonal of crystal coating requires very high.Intra-cavity frequency conversion is that have the characteristics that higher power using intracavitary, will be non-thread
Property crystal be placed on intracavitary carry out frequency conversion.Opposite chamber external square type, under the requirement of identical frequency transfer efficiency, intracavitary allows hot spot
Size is larger, and crystal service life greatly increases.But in intracavitary transfer process, three fundamental frequency, frequency multiplication, frequency tripling wavelength lights are same
Shi Jinhang energy exchanges, can influence the stability of laser work, and the insertion of intracavitary element will also result in a degree of power damage
Consumption, and longer chamber length causes fundamental frequency light impulse length wider, influences frequency conversion efficiency.Therefore, how to design and develop and is defeated
Go out high power, burst pulse, the long-life ultraviolet laser that beam quality is basic mode, there is important technology and realistic meaning.
Resonant cavity in the prior art is generally " average chamber " or " flat-concave cavity ", and (average chamber refers to laser resonant cavity
Outermost end two hysteroscopes in both sides are flat mirror, and flat-concave cavity refers to that the hysteroscope one of both sides outermost end two of laser resonant cavity is flat
Mirror, another is concave mirror).The loss of resonator of " average chamber " or " flat-concave cavity " composition is small, and intracavitary model volume is small, can utilize
Gain crystal in inverted population it is few.Moreover, " average chamber " or " flat-concave cavity " can not compensate crystal in high-power operation
Thermal lensing effect, when pumping light power increases, since thermal lensing effect is aggravated, internal oscillation is easy the areas Chu Wen, causes
Fundamental frequency luminous power reduces.
Superpower laser generally uses Z-type chamber or v-shaped cavity in the prior art.In resonant cavity between the adjacent hysteroscope of each two
Constitute an arm of laser.Z-type chamber refers to being distributed the resonant cavity formed by four hysteroscope Z-types, and there are three arm, laser one way passes
Sowing time reflects twice in resonant cavity.V-shaped cavity refers to being distributed the resonant cavity formed by three hysteroscope V-types, and there are two arm, laser
It is reflected once in resonant cavity when one-way only propagation.Gain crystal is arranged in the middle section of chamber Z-type chamber in resonant cavity, non-defeated
The resonant cavity arm lengths of outlet can be adjusted, and to compensate the variation of the thermal lensing effect under high pump power, can also use both-end
Pumping reduces crystal thermal effect.But it is this design compared to v-shaped cavity be mostly used a hysteroscope, increase power attenuation, element cost and
Laser volume.And the presence of compensator arm increases that laser chamber is long, and the pulse width of fundamental frequency light is caused to increase.Same fundamental frequency
Luminous power, pulse width is bigger, and peak power is lower, and nonlinear conversion efficiency is lower.
Traditional intracavity double frequency ultraviolet laser using dichroscope or three-dimensional Look mirror as outgoing mirror, on eyeglass simultaneously
It is coated with the reflectance coating of fundamental frequency light and the transmission film of ultraviolet light.Two end surfaces of frequency tripling crystal are coated with the transmission of ultraviolet light simultaneously
Mould, with reduce ultraviolet light crystal end-face Fresnel loss.This design requirement eyeglass and plane of crystal plating ultraviolet band
Film layer, and the film layer is easy to damage under long-time high-output power, seriously affects the service life of laser.In some designs
It needs to be inserted into anti-reflection to ultraviolet light or high anti-eyeglass in intracavitary to adjust optical path direction, the eyeglass of insertion will produce insertion damage
Consumption, and then reduce the working efficiency of laser.And these are inserted into eyeglass and are sent out with the absorption laser that works long hours there is also of high cost
Heat, easy the problem of bursting.
Chinese patent literature CN10257892 is related to a kind of high-power ultraviolet laser comprising the light that light path is linked in sequence
Source resonant cavity, the resonant cavity are to vibrate the folded form resonant cavity that light path is Z-type.It uses outside the high-power purple of the structure
Laser, since it is with folded form resonant cavity, which need not add any intracavitary light-dividing device, you can real
Existing 355nm wavelength lasers are exported with the independent of 532nm wavelength lasers, and can be achieved at the same time larger die body in laser crystal
Product and model volume smaller in frequency doubling laser crystal so that resonance cavity loss is small, and delivery efficiency is high, and output stability is strong.
Chinese patent literature 200810020724.7 provides the design method of LD both-end pumping high power UV lasers, adopts
Both-end pumping laser crystal is constituted with two LD, output 808nm pump lights pass through aspherics coupled system and Lens Coupling
1064nm laser is generated to laser crystal, carries out intracavitary oscillation using the resonant cavity being made of five plane mirrors, and by Q-switch
Modulation；Modulated 1064nm fundamental frequency lights are passed through two frequency-doubling crystals progress 1064nm fundamental frequency lights and are turned to 532nm frequency doubled lights twice
It changes, the 1064nm fundamental frequency lights and 532nm frequency doubled lights for not completing frequency-doubled conversion pass through frequency tripling crystal frequency tripling, obtained 355nm
Ultraviolet laser is exported from frequency tripling crystal cut at Brewster angle one side.
Above-mentioned patent has the following defects：1, resonant cavity arm is 3, and it is long to increase resonator, increases fundamental frequency
The pulse width of light reduces its peak power and frequency multiplication, the transfer efficiency of frequency tripling.2, element is more in resonator, increases
Laser cavity loss is added, while multicomponent greatly reduces making for laser to the possibility of increase element surface membrane damage
Use the service life.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of single-ended pumped high-power burst pulse basic mode laser.
The present invention also provides a kind of working methods of above-mentioned basic mode laser.
Summary of the invention：
Single-ended pumping is carried out to laser crystal using high-power semiconductor laser, the 1064nm light of generation passes through intracavitary
Oscillation, and modulated by Q-switch and realize pulsed operation.1064nm light passes through frequency tripling crystalline substance on an arm of laser without conversion
After body, passes through frequency-doubling crystal twice and carry out frequency-doubled conversion.Frequency doubled light is carried out using frequency tripling crystal with remaining fundamental frequency light and frequency,
The 355nm light of generation deviates oscillation optical output from crystal cut at Brewster angle one end.
The technical scheme is that：
A kind of single-ended pumped high-power burst pulse basic mode laser includes that the pumping source set gradually along light path, coupling are saturating
Microscope group, planoconvex spotlight, laser crystal, Q-switch, the first flat mirror, frequency tripling crystal, frequency-doubling crystal and the second flat mirror；It is described flat
Convex lens, the first flat mirror and the second flat mirror constitute resonant cavity；One end of the frequency tripling crystal is provided with Brewster's angle；It is described
Brewster's angle cuts to obtain by Brewster；Wherein, the coupled lens group is by multi-disc spherical mirror or aspherical microscope group
At hot spot proportionally can be zoomed in or out.
According to currently preferred, the angle of the Brewster's angle is 58.1 °.
According to currently preferred, the pumping source is high-power LD；The power of high-power LD is at least 25W.
According to currently preferred, the output wavelength of the pumping source includes 808nm, 888nm or 880nm.
According to currently preferred, the laser crystal is Nd:YVO4Crystal, Nd:GdVO4Crystal or Nd:YLF crystal.
According to currently preferred, the frequency-doubling crystal is lbo crystal, ktp crystal, bbo crystal or clbo crystal；It is described
Frequency tripling crystal is lbo crystal, ktp crystal, bbo crystal or clbo crystal.The frequency-doubling crystal, frequency tripling crystal can use
The different same crystal of cut direction.
A kind of working method of above-mentioned basic mode laser, including steps are as follows：
1) pumping source generates pump light；Pump spot is coupled in laser crystal by the coupled lens group, to swashing
Luminescent crystal carries out single-ended pumping, finally generates fundamental frequency light；The coupled lens group has certain magnification ratio to hot spot；
2) fundamental frequency light carries out intracavitary oscillation in the resonant cavity；The fundamental frequency light twice pass through the frequency-doubling crystal into
Row frequency-doubled conversion, obtains frequency doubled light；The frequency doubled light is carried out simultaneously by the frequency tripling crystal with the fundamental frequency light and frequency, production
One end that raw frequency tripling light is provided with Brewster's angle from frequency tripling crystal exports.
According to currently preferred, in the step 1), the coupled lens group is 2 to the magnification ratio of hot spot:1、1:
1、1:2 or 1:4.
According to currently preferred, in the step 2), the fundamental frequency light carries out the mistake of intracavitary oscillation in the resonant cavity
Cheng Zhong is modulated by Q-switch and is realized pulse output.
Further include adjusting the second flat mirror, frequency tripling crystal and frequency-doubling crystal in the step 2) according to currently preferred
The step of angle；Angle by adjusting the second flat mirror obtains frequency doubled light；By the angle for adjusting frequency tripling crystal and frequency-doubling crystal
Degree keeps the uv power exported by the first flat mirror maximum.
Beneficial effects of the present invention are：
1. basic mode laser of the present invention, using the design method of high power single end-pumping resonant cavity, in high pumping work(
There are steady areas when rate, realize the stable operation of laser under single-ended high power；It is designed using plano-convex chamber, increases resonant cavity internal model
One hysteroscope of volume, resonant cavity is mended using the planoconvex spotlight with gain crystal thermal lens identical focal length when high power operates
Thermal lensing effect is repaid, the chamber for reducing resonant cavity under high power is long, reduces the pulse width of fundamental frequency light, increases peak work
Rate improves nonlinear conversion efficiency；The generation of plano-convex chamber being designed with using inhibition multimode when laser operation simultaneously, has
Modeling acts on, and improves the beam quality of laser fundamental frequency light, frequency doubled light and ultraviolet light；
2. the end face of frequency tripling crystal is cut into Brewster's angle, carries out three times by basic mode laser of the present invention
Frequency exports；Due to the chromatic dispersion principle of prism, refractive index of the two in crystal is different, when conllinear fundamental frequency light and frequency doubled light pass through
When crossing the end face, the two deflection angle is different, in the propagation direction separated certain angle；Fundamental frequency light continues to propagate along original optical path, protects
Endovenous laser oscillation is held, frequency tripling light and remaining frequency multiplication light deflection go out outside chamber, the output as laser；
3. basic mode laser of the present invention, the coupled lens group amplified using certain proportion puts pump spot
Greatly, so that the two is had larger matching area in gain crystal, increase utilizable inverted population；
4. basic mode laser of the present invention, be based on single-ended pump mode, avoid both-end pumping bring it is complicated
Problem；Hysteroscope is not needed additional resonant cavity arm and can compensate for using the planoconvex spotlight with gain crystal thermal lens identical focal length
Thermal lensing effect under high pump power；
5. basic mode laser of the present invention need not be inserted into the eyeglass of plating anti-reflection film or high-reflecting film in intracavitary, be inserted into
Element is few, avoids membrane damage risk, reduces cost, power attenuation and adjustment complexity；Frequency tripling crystal one end is cut simultaneously
It is cut into Brewster's angle, the loss of polarization mode can be substantially reduced for the fundamental frequency light of linear polarization, increases fundamental frequency light at the end
The transmitance in face；
6. the design is based on single-ended pump mode, obtain shorter Q impulse using rational cavity configuration swashs with higher
Light device power, efficiency, utilize cut at Brewster angle crystal so that insertion element is few, avoids membrane damage, to improve laser
Service life.
Description of the drawings
Fig. 1 is the structural schematic diagram of single-ended pumped high-power burst pulse basic mode laser of the present invention；
Fig. 2 is the relational graph of the thermal focal length and pump power of laser crystal；
Wherein, 100, pumping source；101, coupled lens group；102, planoconvex spotlight；103, laser crystal；104, Q-switch；
105, the first flat mirror；106, frequency tripling crystal；107, frequency-doubling crystal；108, the second flat mirror.
Specific implementation mode
With reference to embodiment and Figure of description, the present invention will be further described, but not limited to this.
Embodiment 1
As shown in Figure 1.
In the present embodiment, the pump power of LD is 30W, centre wavelength 808nm, half band-width 2nm, tail optical fiber core diameter
400um, numerical aperture NA=0.22.Laser crystal 103 is Nd:YVO4Crystal, 808nm anti-reflection films are plated on two surfaces, 1064nm increases
Permeable membrane, crystalline size are 3 × 3 × 12mm3, doping concentration 0.3%.Temperature control is carried out to the crystal by TEC, temperature control exists
30℃.The radius of curvature of planoconvex spotlight 102 be 200mm, surface plate 1064nm high instead, 808nm anti-reflection films.First flat mirror, 105 table
Face plate 1064nm high instead, 532nm high-reflecting films.Frequency-doubling crystal 107 is I type-Ⅱphase matching mode lbo crystals, frequency tripling crystal 106
For II type-Ⅱphase matching mode lbo crystals.Temperature control is carried out to frequency-doubling crystal 107 by TEC, temperature is controlled at 28 DEG C, to three times
Frequency crystal 106 carries out temperature control, and temperature is controlled at 50 DEG C.
A kind of single-ended pumped high-power burst pulse basic mode laser includes the pumping source 100 set gradually along light path, coupling
Lens group 101, planoconvex spotlight 102, laser crystal 103, Q-switch 104, the first flat mirror 105, frequency tripling crystal 106, frequency multiplication are brilliant
Body 107 and the second flat mirror 108；The planoconvex spotlight 102, the first flat mirror 105 and the second flat mirror 108 constitute resonant cavity；Described three
One end of frequency-doubling crystal 106 is provided with Brewster's angle；The Brewster's angle is by being obtained crystal by cut at Brewster angle
It arrives；Wherein, the coupled lens group 101 is made of multi-disc spherical mirror or aspherical mirror, can proportionally amplify hot spot
Or it reduces.
The angle of the Brewster's angle is 58.1 °.The pumping source 100 is high-power LD；
Originally the construction method of a laser is applied, including steps are as follows：
A mould) is carried out to the length of the hysteroscope of resonant cavity and two arms by crystal thermal effect principle and abcd matrix
It is quasi- to calculate, obtain the distance between focal length, planoconvex spotlight 102 and first flat mirror 105 of planoconvex spotlight 102, the first flat mirror 105 and
The distance between second flat mirror 108 and steady area；The steady area refers to that the feature light beam of chamber is the cavity resonator structure of Gaussian beam；Mould
Quasi- to calculate by computer software, such as Matlab, Mathcad or Lascad realization, the concept in steady area is by art technology
Known to personnel.
Detailed process is：It is flat that planoconvex spotlight 102, laser crystal 103, Q-switch 104 and first are collimated by He-Ne light
Mirror 105 places a piece of outgoing mirror for being 20% to 1064nm transmitances simultaneously between the first flat mirror 105 and frequency tripling crystal 106
It collimates together.
When carrying out the calculating of 102 focal length of planoconvex spotlight, the thermal lens of the laser crystal 103 under high pump power is calculated first
Focal length, as shown in Figure 2.Under the larger pump powers of 25W, the thermal focal length of laser crystal 103 is 100mm.At this point, if flat
102 curvature radius of convex lens is 2 times of thermal focal length, you can generate relatively stable output light, therefore, use radius of curvature for
The planoconvex spotlight 102 of 200mm is used as hysteroscope, can compensate the thermal lensing effect of the generation of laser crystal 103.
B) pump light that pumping source generates is exported by tail optical fiber, and the light of tail optical fiber outgoing is coupled to by coupled lens group 101
In laser crystal 103,101 position of coupled lens group is adjusted, makes the hot spot of focusing in 103 immediate vicinity of laser crystal；
C the angle for) adjusting outgoing mirror, makes the power of 1064nm light reach maximum value；In order to increase model volume in resonant cavity,
Increase utilizable inverted population, while laser crystal surface being avoided to damage, coupled lens group 101 puts hot spot
Large scale is 1:2；
D) 1064nm light keeps Brewster angle incident with 106 cut at Brewster angle end face of frequency tripling crystal；Three
The other end of frequency-doubling crystal 106 obtains the 1064nm laser of outgoing, vertical incidence frequency-doubling crystal 107.After frequency tripling crystal 106
Second flat mirror 108 is set, 108 vertical 1064nm optical propagation directions of the second flat mirror are made.Pumping source is closed, outgoing mirror is withdrawn；It completes
The debugging of laser.
Embodiment 2
A kind of working method of basic mode laser as described in Example 1, including steps are as follows：
1) pumping source 101 generates pump light；Pump spot is coupled to laser crystal by the coupled lens group 101
In 103, single-ended pumping is carried out to laser crystal 103, generates fundamental frequency light；The coupled lens group 101 is to LD optical fiber output hot spots
With certain magnification ratio；
2) fundamental frequency light carries out intracavitary oscillation in the resonant cavity；The fundamental frequency light passes through the frequency-doubling crystal twice
107 carry out frequency-doubled conversion, obtain frequency doubled light；The frequency doubled light and the fundamental frequency light pass through simultaneously the frequency tripling crystal 106 into
Row and frequency, the frequency tripling light of generation are provided with one end output of Brewster's angle from frequency tripling crystal 106.
In frequency conversion, the light that laser crystal 103 is sent out is the level for being parallel to 106 plane of incidence of frequency tripling crystal
Polarised light, when it passes through the Brewster cut surface of frequency tripling crystal 106, the 1064nm light of polarization is wholly transmissive, reduces
The cavity loss of fundamental frequency light.The frequency doubled light generated when frequency multiplication is perpendicular to the plane of incidence of frequency tripling crystal 106, vertical to polarize, frequency multiplication
Light carries out frequency tripling with the fundamental frequency light without conversion in frequency tripling crystal 106, and it is incident that realization is parallel to frequency tripling crystal 106
The output of the horizontal polarization frequency tripling ultraviolet light in face.
In the step 2), the fundamental frequency light carries out the process of intracavitary oscillation by being inserted into Q-switch in the resonant cavity
Realize pulse output.
The 1064nm fundamental frequency lights of modulation pass through frequency-doubling crystal 107 on an arm of laser and carry out frequency-doubled conversion twice.
Frequency doubled light and the fundamental frequency light for not carrying out frequency multiplication carry out frequency tripling, frequency tripling by the frequency tripling crystal 106 of cut at Brewster angle
The 355nm light of generation is exported from one end of Brewster's angle, since there is certain cutting angle, 355nm light to deviate for the end face
1064nm light paths, are emitted to outside chamber.
Frequency tripling crystal one end cut at Brewster angle enhances horizontal polarization 1064nm light with 355nm light in the face
Transmitance.
Embodiment 3
The working method of basic mode laser as described in Example 2 further includes further adjusting in the step 2)
The step of second flat mirror 108,107 angle of frequency tripling crystal 106 and frequency-doubling crystal；Angle by adjusting the second flat mirror 108 obtains
To frequency doubled light；By adjusting the angle of frequency tripling crystal 106 and frequency-doubling crystal 107, the luminous power for making 105 side of the first flat mirror export
It is maximum.
Claims (10)
1. a kind of single-ended pumped high-power burst pulse basic mode laser, which is characterized in that include the pumping set gradually along light path
Source, coupled lens group, planoconvex spotlight, laser crystal, Q-switch, the first flat mirror, frequency tripling crystal, frequency-doubling crystal and second are flat
Mirror；The planoconvex spotlight, the first flat mirror and the second flat mirror constitute resonant cavity；One end of the frequency tripling crystal be provided with cloth scholar this
Special angle.
2. single-ended pumped high-power burst pulse basic mode laser according to claim 1, which is characterized in that the cloth scholar this
The angle at special angle is 58.1 °.
3. single-ended pumped high-power burst pulse basic mode laser according to claim 1, which is characterized in that the pumping source
For high-power LD；LD power is at least 25W.
4. single-ended pumped high-power burst pulse basic mode laser according to claim 1, which is characterized in that the pumping source
Output wavelength include 808nm, 888nm or 880nm.
5. single-ended pumped high-power burst pulse basic mode laser according to claim 1, which is characterized in that the laser is brilliant
Body is Nd:YVO4Crystal, Nd:GdVO4Crystal or Nd:YLF crystal.
6. single-ended pumped high-power burst pulse basic mode laser according to claim 1, which is characterized in that the frequency multiplication is brilliant
Body is lbo crystal, ktp crystal, bbo crystal or clbo crystal；The frequency tripling crystal is lbo crystal, ktp crystal, bbo crystal
Or clbo crystal.
7. a kind of working method of basic mode laser as claimed in any one of claims 1 to 6, which is characterized in that such as including step
Under：
1) pumping source generates pump light；Pump spot is coupled in laser crystal by the coupled lens group, to laser crystalline substance
Body carries out single-ended pumping, finally generates fundamental frequency light；The coupled lens group has certain magnification ratio to hot spot；
2) fundamental frequency light carries out intracavitary oscillation in the resonant cavity；The fundamental frequency light carries out again by the frequency-doubling crystal twice
Frequency is converted, and frequency doubled light is obtained；The frequency doubled light is carried out simultaneously by the frequency tripling crystal with the fundamental frequency light and frequency, generation
One end that frequency tripling light is provided with Brewster's angle from frequency tripling crystal exports.
8. the working method of basic mode laser according to claim 7, which is characterized in that in the step 1), the coupling
It is 2 to the magnification ratio of hot spot to close lens group:1、1:1、1:2 or 1:4.
9. the working method of basic mode laser according to claim 7, which is characterized in that in the step 2), the base
Frequency light is modulated by Q-switch during the resonant cavity carries out intracavitary oscillation and realizes pulse output.
10. the working method of basic mode laser according to claim 7, which is characterized in that in the step 2), further include
The step of adjusting the second flat mirror, frequency tripling crystal and frequency-doubling crystal angle；Angle by adjusting the second flat mirror obtains frequency doubled light；
By adjusting the angle of frequency tripling crystal and frequency-doubling crystal, make the maximum optical power exported by the first flat mirror.
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