CN104682184A - Longitudinal local beam-expanding triple frequency laser terminal optical system - Google Patents
Longitudinal local beam-expanding triple frequency laser terminal optical system Download PDFInfo
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- CN104682184A CN104682184A CN201510114212.7A CN201510114212A CN104682184A CN 104682184 A CN104682184 A CN 104682184A CN 201510114212 A CN201510114212 A CN 201510114212A CN 104682184 A CN104682184 A CN 104682184A
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Abstract
The invention relates to the field of high power laser and particularly relates to a longitudinal local beam-expanding triple frequency laser terminal optical system. The system comprises a double frequency crystal, a first cylindrical focusing lens, a triple frequency crystal and a second cylindrical focusing lens which are sequentially arranged in the transmission direction of an incident laser beam, wherein the triple frequency crystal and the second cylindrical focusing lens are obliquely arranged, the triple frequency crystal inclines along a vertical rotary shaft of the triple frequency crystal, the second cylindrical focusing lens inclines along a horizontal rotary shaft of the second cylindrical focusing lens, and the vertical rotary shaft of the triple frequency crystal and the horizontal rotary shaft of the second cylindrical focusing lens are mutually orthogonal. According to the longitudinal local beam-expanding triple frequency laser terminal optical system, local beam expanding can be realized to reduce the mean flux of the triple frequency laser, the severe ultraviolet damage problem is alleviate, and meanwhile, the implementation cost and the system complexity are reduced.
Description
Technical field
The present invention relates to high power laser light field, particularly relate to a kind of longitudinally local and expand frequency tripled laser final-optics system.
Background technology
Inertial confinement fusion (Inertial Confinement Fusion, ICF) is one of effective way realizing controllable thermonuclear fusion, and each big country of the world is all actively developing correlative study.The multiple stage large scale laser instrument that has that is built and that building is studied for ICF at present, such as America NI F device, French LMJ device, Chinese God Light equipment series etc.Export macro-energy because nd glass laser has and be easy to control, so most of device all designs based on nd glass laser.In order to suppress laser plasma instability (the Laser Plasam Instablity in target practice process, LPI) problem, neodymium glass near-infrared laser is needed to carry out frequency inverted, become the frequency tripling Ultra-Violet Laser that wavelength is shorter, but the operation of recent each device all exposes a serious engineering problem, the ultraviolet section optic element damage of frequency tripled laser final-optics system (mainly completing frequency inverted and light beam focusing function) is serious, add the operating cost of device, reduce the operational efficiency of device.In fact, the ruuning situation of device fundamental frequency section optical element is then far better, visible exist fundamental frequency section and the unmatched problem of frequency tripling section optical element load, in order to address this problem, the most also be the most effective way be that frequency tripled laser final-optics system is expanded, reduce frequency tripled laser average flux, but expand the remarkable increase often bringing cost and system complexity, implement difficulty very large, the proposition of this patent is just in order to address this problem.
Summary of the invention
For above-mentioned technical problem, the present invention has designed and developed a kind of longitudinally local and has expanded frequency tripled laser final-optics system, object is that providing one can either realize local expands, reduce frequency tripled laser average flux, alleviate serious ultraviolet damage problem, the high-energy frequency tripled laser final-optics system of implementation cost and reduction system complexity can be saved again.
Technical scheme provided by the invention is:
A kind of longitudinally local expands frequency tripled laser final-optics system, comprising:
Along two frequency-doubling crystals, the first cylindrical focusing lens, frequency tripling crystal and the second cylindrical focusing lens that incident laser transmission direction is arranged successively,
Wherein, described frequency tripling crystal and the second cylindrical focusing lens are all obliquely installed, and described frequency tripling crystal tilts along its vertical rotating shaft, described second cylindrical focusing lens tilts along its feathering axis, the vertical rotating shaft of described frequency tripling crystal and the feathering axis of the second cylindrical focusing lens mutually orthogonal.Frequency tripling crystal and the second cylindrical focusing lens wide-angle tilt are used, significantly can increase the beam area of transmitted light beam in optical element surface and body, the equivalence local realizing frequency tripled laser final-optics system load Bottle Neck Road expands, reduce frequency tripled laser average flux, thus improve the degree of impairment of frequency tripling optical element, increase the fan-out capability of frequency tripled laser final-optics system; Compare traditional horizontal system and expand design, the present invention only tilts for the optical element of frequency tripled laser final-optics system necessity, realizes local and expands, can reduce implementation cost and system complexity.
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, and the incline direction of described frequency tripling crystal is the o direction of principal axis of frequency tripling crystal, and the incline direction of described second cylindrical focusing lens is parallel to the e direction of principal axis of frequency tripling crystal.Like this for the second cylindrical focusing lens and the optical element below thereof of frequency tripling section, fundamental frequency and frequency tripled laser are p polarizations, two double-frequency lasers are s polarizations, even if they are plated film not, fundamental frequency and frequency tripled laser also can high efficiency transmissions, two double-frequency lasers have certain reflection and carry out frequency separation, thus the problem that under effectively prevent vacuum environment, optical element rete is degenerated.And the transmission of optical element wide-angle tilt, make optical element surface residual reflection laser not assemble the terrible light producing other optical element of damage, just directly absorbed by sidewall, thus achieve the final-optics system of " without terrible light ".
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, and the focus direction of described first cylindrical focusing lens is parallel with the o direction of principal axis of described frequency tripling crystal.Before first cylindrical focusing lens is arranged on frequency tripling crystal, make use of frequency tripling crystal to the insensitive feature of o direction of principal axis beam divergence angle, do not affect frequency tripling conversion efficiency, quantity and the thickness of frequency tripling section optical element can be reduced simultaneously, be conducive to alleviating laser damage problem.
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, and be also provided with shielding sheet after described second cylindrical focusing lens, the incline direction of described shielding sheet is parallel to the incline direction of described second cylindrical focusing lens.Laser focusing is through the injection of shielding sheet, and the fragment that the target practice of shielding sheet stop shoot laser produces, plays a protective role to whole system.
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, and be also provided with vacuum window before described two frequency-doubling crystals, incident laser enters in described two frequency-doubling crystals through described vacuum window.The high vacuum environment that the target practice of vacuum window sealed laser needs.
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, and described incident laser is neodymium glass near-infrared laser.
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, and the cutting angle of described frequency tripling crystal cuts again according to angle of inclination.Frequency tripling crystal again cut direction should guarantee phase matched and efficient frequency conversion.
Preferably, described longitudinal direction local expands in frequency tripled laser final-optics system, the orthogonal setting of focus direction of described first cylindrical focusing lens and the second cylindrical focusing lens.Focus on compared to traditional design and adopt rotational symmetric sphere or non-spherical lens, a branch of parallel laser is focused on a bit.The present invention focuses on employing two pieces of cylindrical focusing lens, and the surface of cylindrical focusing lens is cylinder, and aspheric surface, a branch of parallel laser can both be focused on being aligned by every block, and two pieces of orthogonal placements just can be focused into a bit.The cylindrical lens using two orthogonal directions to arrange realizes combined focus, be one-dimensional problem by two-dimension focusing problem reduction, such second cylindrical focusing lens carries out wide-angle tilt transmission along focus direction, less on focusing performance impact, and optical element is easy to processing.
Longitudinally local of the present invention expands the seven large functions such as frequency tripled laser final-optics system can realize frequency inverted, frequency separation, light beam focuses on, focal spot controls, measurement sampling, vacuum seal, fragment protective.The present invention utilizes optical element wide-angle tilt to use, significantly can increase the feature of transmitted light beam at optical element surface and body inner light beam area, the equivalence local realizing frequency tripled laser final-optics system load Bottle Neck Road expands, reduce frequency tripled laser average flux, thus improve frequency tripling optic element damage situation, increase frequency tripled laser final-optics system fan-out capability.It is compared traditional horizontal system and expands design, only tilts to realize local to the optical element of frequency tripled laser final-optics system necessity and expands, can reduce implementation cost and system complexity, in addition, does not change lateral dimension and is also conducive to saving installing space.
Accompanying drawing explanation
Fig. 1 is the result of calculation figure that optical element slanted transmission increases beam area;
Fig. 2 is that longitudinally local of the present invention expands the front view of frequency tripled laser final-optics system;
Fig. 3 is that longitudinally local of the present invention expands the vertical view of frequency tripled laser final-optics system;
Fig. 4 is that traditional horizontal system expands frequency tripled laser final-optics system schematic.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to specification word to make those skilled in the art.
As shown in Figure 1, along with optical element angle of inclination increases, in surperficial beam area, body inner light beam area, body, path all increases, and in body, path and body inner light beam area ratio reduce simultaneously.For identical input laser energy, this means that optical element surface laser flux reduces, body inner laser intensity reduces, and laser medium thickness increases, body inner laser intensity is multiplied by laser medium thickness and reduces, and nonlinear effect in optical element surface load flux and body is all eased.Be placed as example with optical element Brewster's angle, refractive index 1.5,56.3 °, angle of inclination, surface laser flux reduces by 1.8 times, and body inner laser intensity reduces by 1.5 times, and laser medium thickness increases by 1.2 times, and body inner laser intensity is multiplied by laser medium thickness and reduces by 0.8 times.
As shown in figures 2-3, the invention provides a kind of longitudinally local and expand frequency tripled laser final-optics system, comprise: the vacuum window of arranging successively along incident laser transmission direction, two frequency-doubling crystals, first cylindrical focusing lens, frequency tripling crystal, second cylindrical focusing lens and shielding sheet, wherein, described frequency tripling crystal, second cylindrical focusing lens and shielding sheet are all obliquely installed, and described frequency tripling crystal rotates along its vertical rotating shaft, thus inclination certain angle, described second cylindrical focusing lens and shielding sheet rotate along its feathering axis, thus inclination certain angle, the vertical rotating shaft of described frequency tripling crystal and the second cylindrical focusing lens and to shield the feathering axis of sheet mutually orthogonal.
Neodymium glass near-infrared laser (basic frequency laser) 7 enters target practice vacuum environment by vacuum window 1, two frequency-doubling crystals 2 by basic frequency laser by a certain percentage frequency multiplication obtain two double-frequency lasers, in the first cylindrical focusing lens 3, do not change basic frequency laser and two double-frequency lasers focus on along two frequency-doubling crystal 2 sensitive axes (e axle) directions or the non-sensitive axle of frequency tripling crystal 4 (o axle) direction, frequency tripling crystal 4 is placed along same direction wide-angle tilt, frequency tripling crystal 4 is efficient and non-switched basic frequency laser and two double-frequency lasers obtain frequency tripled laser 8 frequently, frequency tripled laser is practiced shooting by the second cylindrical focusing lens 5 and shielding sheet 6, shielding sheet 6 stops the fragment of practicing shooting and producing, second cylindrical focusing lens 5 and shielding sheet 6 are placed along with frequency tripling crystal 4 orthogonal direction wide-angle tilt.Namely the incline direction of described frequency tripling crystal is the o direction of principal axis of frequency tripling crystal, the incline direction of described second cylindrical focusing lens is parallel to the e direction of principal axis of frequency tripling crystal, the incline direction of described shielding sheet is parallel to the incline direction of described second cylindrical focusing lens, namely the incline direction shielding sheet is the e direction of principal axis being parallel to frequency tripling crystal, shielding sheet and the second cylindrical focusing lens be arranged in parallel, and the focus direction of described first cylindrical focusing lens is parallel with the o direction of principal axis of described frequency tripling crystal.
The ultraviolet section optical element being easy to damage in technical scheme of the present invention comprises frequency tripling crystal 4, second cylindrical focusing lens 5 and shielding sheet 6, their all wide-angle tilt placements, as mentioned above, surface laser flux and body inner laser intensity can be reduced like this, thus alleviate serious ultraviolet damage problem; Meanwhile, it is also proposed new requirement to these optical elements, length increases, and frequency tripling crystal (originally II class frequency tripling crystal-cut angle: crystal axial angle 59 °, 0 °, azimuth) cuts again.Optical element length increase can be solved by small-bore optical element splicing, and this is conducive to shortening horizontal gain path length, alleviates the horizontal nonlinear effects such as TSRS, TSBS.Frequency tripling crystal cuts again should guarantee that laser does not change at the relative crystallographic axis of intracrystalline transmission direction, realizes phase matched and efficient frequency conversion; Be placed as example with frequency tripling crystal Brewster's angle, redesign II class frequency tripling crystal-cut angle: crystal axial angle 59 °, 39 °, azimuth.
Light beam is focused on and is realized by the condenser lens of two pieces of orthogonal settings of focus direction, i.e. the first cylindrical focusing lens 3 and the second cylindrical focusing lens 5, first cylindrical focusing lens 3 is placed on two times of frequency ranges, damage problem is eased, second cylindrical focusing lens 5 is placed on frequency tripling section, it is placed along focus direction wide-angle tilt, and cylindrical curve needs according to angle of inclination analysis and designation.Two pieces of cylindrical focusing lens focus on along orthogonal direction introduces a small amount of aberration, and focal spot has a certain impact, and can be compensated by ADAPTIVE OPTICS SYSTEMS.
First cylindrical focusing lens 3 is along the non-sensitive axle of frequency tripling crystal 4 (o axle) direction focusing, and convergent angle (about several years) can not have an impact to frequency tripling efficiency; Frequency tripling crystal 4 is placed along same direction wide-angle tilt, does not change basic frequency laser and two double-frequency lasers in intracrystalline dispersion angle much smaller than convergent angle, also can not have an impact to frequency tripling efficiency.
Second cylindrical focusing lens 5 and shielding sheet 6 are along frequency tripling crystal 4 sensitive axes (e axle) direction focusing, do not change basic frequency laser and frequency tripled laser polarization state and optical parts normal coplanar, it is all p polarization, even if they are plated film not, also the transmission of efficient stable can be realized, thus the problem that under effectively prevent vacuum environment, optical element rete is degenerated; In contrast, not changing two double-frequency lasers is s polarizations, has certain reflection (for Brewster's angle, one side Fresnel reflection 15%), can realize simple frequency separation, make two double-frequency lasers not get to target spot.
Ultraviolet section optical element wide-angle tilt of the present invention is placed, their surface residual reflects laser is directly absorbed by sidewall, do not assemble and produce other optical element of terrible light injury, thus achieve the final-optics system of " without terrible light ", decrease the restriction of final-optics systems for optical arrangement of elements, this allows to increase optical element spacing and carrys out control noises, is conducive to alleviating longitudinal nonlinear effects such as self focusing.
As shown in Figure 4, tradition horizontal system expands frequency tripling final-optics system and comprises five pieces of optical elements: basic frequency laser 6 enters target practice vacuum environment by vacuum window 1, two frequency-doubling crystals 2 by basic frequency laser by a certain percentage frequency multiplication obtain two double-frequency lasers, frequency tripling crystal 3 is efficient and frequency does not change basic frequency laser and two double-frequency lasers obtain frequency tripled laser 7, condenser lens 4 light beam focuses on frequency tripled laser, shielding sheet 5 stops the fragment of practicing shooting and producing, and all optical elements are all closely vertical with incident laser to be placed.
Tradition horizontal system expands and requires to expand all optical elements, and the bore of upstream series of transmission optical element, and the cost brought thus increases and the complexity of engineering adjustment is surprising, implements difficulty larger.The present invention compares with traditional design, have and implement flexibility greatly, only need to tilt to realize local to the optical element of necessity to expand, the cost that it increases and difficulty are all limited, do not change lateral dimension in addition, then greatly save installing space, be convenient to regular job and the maintenance of final-optics system, the operational efficiency of device can be improved.For existing apparatus beam size 400mm × 400mm, beam area expands 1.5 times, and traditional design requires that at least 10 pieces of optical element clear apertures are increased to 490mm × 490mm, and final-optics system lateral dimension also needs corresponding increase simultaneously; Compare, technical scheme of the present invention only affects length and the setting angle of three pieces of optical elements, and the interface relationships such as upstream transmission light path and final-optics system periphery are all unaffected.
Although embodiment of the present invention are open as above, but it is not restricted to listed in specification and execution mode utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (8)
1. longitudinally local expands a frequency tripled laser final-optics system, it is characterized in that, comprising:
Along two frequency-doubling crystals, the first cylindrical focusing lens, frequency tripling crystal and the second cylindrical focusing lens that incident laser transmission direction is arranged successively,
Wherein, described frequency tripling crystal and the second cylindrical focusing lens are all obliquely installed, and described frequency tripling crystal tilts along its vertical rotating shaft, described second cylindrical focusing lens tilts along its feathering axis, the vertical rotating shaft of described frequency tripling crystal and the feathering axis of the second cylindrical focusing lens mutually orthogonal.
2. longitudinally local as claimed in claim 1 expands frequency tripled laser final-optics system, it is characterized in that, the incline direction of described frequency tripling crystal is the o direction of principal axis of frequency tripling crystal, and the incline direction of described second cylindrical focusing lens is parallel to the e direction of principal axis of frequency tripling crystal.
3. longitudinally local as claimed in claim 2 expands frequency tripled laser final-optics system, and it is characterized in that, the focus direction of described first cylindrical focusing lens is parallel with the o direction of principal axis of described frequency tripling crystal.
4. longitudinally local as claimed in claim 2 expands frequency tripled laser final-optics system, it is characterized in that, also be provided with shielding sheet after described second cylindrical focusing lens, the incline direction of described shielding sheet is parallel to the incline direction of described second cylindrical focusing lens.
5. longitudinally local as claimed in claim 1 expands frequency tripled laser final-optics system, and it is characterized in that, be also provided with vacuum window before described two frequency-doubling crystals, incident laser enters in described two frequency-doubling crystals through described vacuum window.
6. longitudinally local as claimed in claim 1 expands frequency tripled laser final-optics system, and it is characterized in that, described incident laser is neodymium glass near-infrared laser.
7. longitudinally local as claimed in claim 1 expands frequency tripled laser final-optics system, and it is characterized in that, the cutting angle of described frequency tripling crystal cuts again according to angle of inclination.
8. longitudinally local as claimed in claim 1 expands frequency tripled laser final-optics system, it is characterized in that, the orthogonal setting of focus direction of described first cylindrical focusing lens and the second cylindrical focusing lens.
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| CN201510114212.7A CN104682184B (en) | 2015-03-16 | 2015-03-16 | A kind of longitudinal direction is local to expand frequency tripled laser final-optics system |
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| CN201510114212.7A CN104682184B (en) | 2015-03-16 | 2015-03-16 | A kind of longitudinal direction is local to expand frequency tripled laser final-optics system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946891A (en) * | 2017-12-14 | 2018-04-20 | 湖北工业大学 | A kind of high-power ultraviolet solid-state laser |
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| CN204441700U (en) * | 2015-03-16 | 2015-07-01 | 中国工程物理研究院激光聚变研究中心 | A kind of longitudinally local expands frequency tripled laser final-optics system |
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2015
- 2015-03-16 CN CN201510114212.7A patent/CN104682184B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5532880A (en) * | 1994-07-01 | 1996-07-02 | Lockhead Missiles & Space Company, Inc. | Laser beam expanders |
| US6842293B1 (en) * | 2002-04-13 | 2005-01-11 | Yusong Yin | Beam expander |
| CN101408645A (en) * | 2008-11-25 | 2009-04-15 | 中国科学院上海微系统与信息技术研究所 | Ellipse light spot optical fiber collimator and application thereof |
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| WO2014151887A1 (en) * | 2013-03-14 | 2014-09-25 | Ipg Photonics Corporation | Highly efficient, single-pass, harmonic generator with round output beam |
| CN204441700U (en) * | 2015-03-16 | 2015-07-01 | 中国工程物理研究院激光聚变研究中心 | A kind of longitudinally local expands frequency tripled laser final-optics system |
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| CN107946891A (en) * | 2017-12-14 | 2018-04-20 | 湖北工业大学 | A kind of high-power ultraviolet solid-state laser |
| CN107946891B (en) * | 2017-12-14 | 2019-09-17 | 湖北工业大学 | A kind of high-power ultraviolet solid-state laser |
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