CN103594918B - A kind of method and apparatus exporting hollow laser beam - Google Patents
A kind of method and apparatus exporting hollow laser beam Download PDFInfo
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- CN103594918B CN103594918B CN201310537739.1A CN201310537739A CN103594918B CN 103594918 B CN103594918 B CN 103594918B CN 201310537739 A CN201310537739 A CN 201310537739A CN 103594918 B CN103594918 B CN 103594918B
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Abstract
The invention discloses a kind of method exporting hollow beam, including: the solid light beam that (1) laser instrument produces, shaped system is shaped as the annular pump light of hollow；(2) the annular pump light of this hollow, incides coupled system along optical axis, and described annular pump light is transformed into the hollow beam of suitable diameter size by this coupled system；(3) this hollow beam is coupled into resonator from the end face of laserresonator, and laser gain medium is carried out pumping, makes the gain media absorptive pumping light in described resonator produce the hollow laser of continuous print by phase controlling and exports.The invention also discloses a kind of hollow beam output device.Apparatus and method of the present invention is by being changed as hollow form by incident pump light from common solid form, the axial portions making laser generation does not has gain, pass through phase controlling again, obtain hollow laser beam output, have and realize advantage simple, that reliability is high, conversion efficiency is high and power output is high.
Description
Technical field
The invention belongs to laser field, be specifically related to a kind of method and apparatus exporting hollow laser beam.
Background technology
For a long time, solid laser beam has a wide range of applications in conventional laser industry such as cutting, cladding, welding and mark etc..But in recent years, due to the promotion of application technology, various center intensity be zero laser beam hollow laser beam in succession produce, and forming the extended familys of a novel so-called hollow beam (also referred to as dark hollow beam).Hollow beam, as laser catheter, optical tweezers (light pincers) and optical wrench, has a wide range of applications in the manipulation accurate, contactless and control of microcosmic particle (such as micro particles, nano particle, free electron, biological cell and atom or molecule etc.).
Due to the generation of hollow beam, also promote the further optimization of a lot of conventional laser application self-examination beam pattern in turn.The most even finding conventional laser manufacture field such for laser impact forming, hollow beam also has certain advantage.This hollow beam, in addition to having the general parameters of the laser beams such as laser frequency, laser power and beam divergence angle, also has some special parameters such as blackening size, width of light beam, beam radius and width radius ratio.All kinds of hollow beams have the physical property of its uniqueness, distribution as cylindrical in intensity, the least blackening size, without heating effect, propagate consistency and there is spinning and orbit angular momentum etc., these character make hollow beam have a wide range of applications in laser optics, optical information processing, particulate waveguide, isotopic separation, microelectronics and material science, biotechnology, medical science and the field such as atomics, molecules.
So far, the method that there is multiple generation hollow laser beam in prior art, such as geometrical optics approach, hollow light nanofarads, π phase board method, Identification with Method of Optical Holography and computer-generated hologram method etc..Wherein, geometrical optics approach, hollow light nanofarads and π phase board method obtain hollow beam, and advantage is simple in construction, facilitates implementation, but the shortcoming of the beam quality that conversion efficiency is low, the purity of output hollow beam is the highest and relatively low is also apparent from；And computer-generated hologram method and Identification with Method of Optical Holography obtain hollow beam, although the purity of output hollow beam is high, good beam quality, but relatively costly, and manufacture difficulty is the biggest.
Chinese patent literature 201210049178.6 discloses a kind of employing end pumping, pump light focus is coupled to gain medium either internally or externally, the method obtaining hollow laser beam.The hot spot of the hollow beam that the method obtains is made up of the least secondary lobe, this discrete annular hollow light beam has certain restriction in actual application, such as it is being excited to be lost in microscopy, existence due to secondary lobe, hollow beam is the most obvious to the Control of Fluorescence effect of exciting light, cause the generation of fragmentary impurity fluorescence, reduce the resolution ratio being excited that microscopy is lost.
Summary of the invention
Disadvantages described above or Improvement requirement for prior art, the present invention provides a kind of method and apparatus exporting hollow laser beam, its object is to utilize annular pump light, by axial end pumping, form the gain region of hollow form in the gain medium, directly obtain the output of hollow laser beam, by the ring-type spot size of annular pump light is accurately controlled, realize the control to zlasing mode, solve the problem that hollow beam center is the most unglazed, simultaneously by phase controlling, solve the discontinuous problem of hollow beam cavity ring.
According to one aspect of the present invention, a kind of method exporting hollow beam is provided, after solid pump light is shaped as hollow pump light, coupling pump light is entered laserresonator by recycling coupled system, in the way of axial end pumping, form the gain region of hollow form in the gain medium, pass through laser generation, realize the direct output of hollow laser beam, specifically comprise the following steps that
(1) the solid light beam that laser instrument produces, shaped system is shaped as the annular pump light of hollow；
(2) the annular pump light of this hollow, incides coupled system along optical axis, and described annular pump light is transformed into the hollow beam of suitable diameter size by this coupled system；
(3) this hollow beam is coupled into resonator from the end face of laserresonator, and laser gain medium is carried out pumping, makes the gain media absorptive pumping light in described resonator produce the hollow laser of continuous print by phase controlling and exports.
As the improvement of the present invention, the hollow laser of described continuous print is by changing the phase place of incident beam continuously so that in resonator a kind of phase pattern can persistent oscillation and realize.
As the improvement of the present invention, the spiral phase plate being arranged in resonator by that changes continuously of described incident beam phase place realizes, and this spiral phase plate is the phase diffractive optical element that optical thickness is directly proportional to rotational orientation angle.
It is another aspect of this invention to provide that provide a kind of device exporting hollow beam, for realizing being transformed to solid pump light the hollow pump beam of continuous print, it is characterised in that this device includes:
Orthopedic systems, after it is arranged on the solid light beam of input, for being shaped as hollow beam by this solid light beam；
Coupling pump light system, after it is arranged on described orthopedic systems along light path, for being transformed into the hollow beam of suitable diameter size by described hollow beam；
Laserresonator, after it is arranged on described coupled system along light path, the hollow beam of described suitable diameter size is coupled into resonator from the end face of this laserresonator, laser gain medium is carried out pumping, makes the gain media absorptive pumping light in described resonator produce the hollow laser of continuous print by phase controlling and export.
Improvement as the present invention, described orthopedic systems is made up of the annular hollow internal conical surface speculum with same apex angle of outer conical surface speculum and co-axial placement, the i.e. surface of emission of outer conical surface speculum is parallel with the reflecting surface of annular hollow internal conical surface speculum, incident light axis overlaps with the rotation axes of symmetry of outer conical surface speculum and annular hollow internal conical surface speculum, light beam is incident at outer conical surface speculum, reflection light is to dissipate annular beam centered by optical axis, it is after annular hollow internal conical surface speculum reflects, outgoing in the way of parallel with the incident beam initially entering orthopedic systems, it is the hollow beam parallel with optical axis.
Improvement as the present invention, described orthopedic systems is made up of internal conical surface speculum and the outer conical surface speculum with same apex angle placed in contrast, this internal conical surface speculum rotation axes of symmetry becomes 135 ° of angles with incident beam optical axis, the rotation axes of symmetry of outer conical surface speculum is parallel with internal conical surface speculum rotation axes of symmetry, and internal conical surface speculum is vertical with incident beam optical axis with outer conical surface speculum summit line.
Improvement as the present invention, described orthopedic systems by internal conical surface lens and co-axial placement there is same apex angle, the outer conical surface lens of identical refractive index are constituted, two lens be all side be plane, side is the mirror structure of taper seat, wherein the rotation axes of symmetry of taper seat is vertical with plane, and with the light shaft coaxle of incident beam.
As the improvement of the present invention, the coupling of described end pumping is combined by spherical lens or cylindrical lens combination carries out coupling, being carried out coupling or pass through optical fiber coupling realization by GRIN Lens.
Improvement as the present invention, described laserresonator 4 includes that the eyeglass set gradually along optical axis, spiral phase plate, gain media, focal length are the cylindrical mirror system that the cylindrical mirror of f constitutes and want and be located between two cylindrical mirrors the distance with two cylindrical mirrors and be the eyeglass of f, light beam is incident from described eyeglass, vibrate back and forth between eyeglass and eyeglass, wherein said light beam per pass spiral phase plate, phase factor will increase the single order beams so that only exporting single-phase bit pattern, thus forms continuous print hollow beam.
As the improvement of the present invention, described gain media is YAG rod.
In the present invention, incident pump light can be solid, and solid pump light first incides an orthopedic systems, and the pump light exported by shaping becomes hollow annular pump light.
In the present invention, solid pump light can be the solid laser beam that semiconductor laser sends, and coupled system can be semiconductor laser coupled system.
In general, apparatus and method of the present invention is relative to prior art, it is by being changed as hollow form by incident pump light from common solid form, the axial portions making laser generation does not has gain, pass through phase controlling again, obtain hollow laser beam output, have and realize advantage simple, that reliability is high, conversion efficiency is high and power output is high.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram according to the embodiment of the present invention；
Fig. 2 is the structural representation of an embodiment of orthopedic systems in Fig. 1；
Fig. 3 is the structural representation of another embodiment of orthopedic systems in Fig. 1；
Fig. 4 is the structural representation of orthopedic systems further embodiment in Fig. 1；
Fig. 5 is coupled system schematic diagram in Fig. 1；
Fig. 6 is laserresonator schematic diagram in Fig. 1；
Fig. 7 is spiral phase plate schematic diagram in Fig. 6；
Fig. 8 is single LG degenerate mode laser beam additive process schematic diagram；
Fig. 9 is LG0,+lThe phase factor of pattern light beam is the process analysis procedure analysis of round-trip transmission in resonator；
Figure 10 is LG0,-lThe phase factor of pattern light beam is the process analysis procedure analysis of round-trip transmission in resonator；
In all of the figs, same reference represents identical technical characteristic, wherein, 1-pump light, 2-orthopedic systems, 3-coupled system, 4-laserresonator, the hollow output beam of 5-.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.As long as just can be combined with each other additionally, technical characteristic involved in each embodiment of invention described below does not constitutes conflict each other.
The light beam that semiconductor laser sends is solid light beam, but its light beam is astigmatic pencil on fast axle and slow-axis direction, is collimated by ordinary lens, i.e. can obtain the output beam of circular solids, using as the pump light 1 in embodiment of the present invention Fig. 1.
Pump light 1 is by orthopedic systems 2 so that solid light beam becomes hollow beam.Orthopedic systems in the present invention is for being shaped as hollow beam by solid light beam, and its concrete apparatus and method have multiple, and preferred three kind orthopedic systems concrete structures are presented herein below.
nullAs shown in Figure 2，The orthopedic systems 2 of the present embodiment is made up of the annular hollow internal conical surface speculum 202 with same apex angle of outer conical surface speculum 201 and co-axial placement，The i.e. surface of emission of outer conical surface speculum 201 is parallel with the reflecting surface of annular hollow internal conical surface speculum 202，Incident light axis overlaps with the rotation axes of symmetry of outer conical surface speculum 201 and annular hollow internal conical surface speculum 202，Light beam is incident at outer conical surface speculum 201，Reflection light is to dissipate annular beam centered by optical axis，Owing to the reflecting surface of annular hollow internal conical surface speculum 202 is parallel with the reflecting surface of outer conical surface speculum 201，Therefore light beam is again after annular hollow internal conical surface speculum 202 reflects，Can outgoing in the way of parallel with the incident beam initially entering orthopedic systems，It is the hollow beam parallel with optical axis.
As shown in Figure 3, the orthopedic systems of another embodiment of the present invention is made up of internal conical surface speculum 203 and the outer conical surface speculum 204 with same apex angle placed in contrast, internal conical surface speculum 203 rotation axes of symmetry becomes 135 ° of angles with incident beam optical axis, the rotation axes of symmetry of outer conical surface speculum 204 is parallel with internal conical surface speculum 203 rotation axes of symmetry, internal conical surface speculum 203 is vertical with incident beam optical axis with outer conical surface speculum 204 summit line, and beam shaping process is identical with 1.
As shown in Figure 4, the orthopedic systems of further embodiment of this invention by internal conical surface lens 205 and co-axial placement there is same apex angle, the outer conical surface lens 206 of identical refractive index are constituted, two lens be all side be plane, side is the mirror structure of taper seat, wherein the rotation axes of symmetry of taper seat is vertical with plane, and with the light shaft coaxle of incident beam.Incident beam is incident from the plane side of internal conical surface lens 205, again when the outgoing of taper seat side, due to refraction effect, light beam can be to away from optical axis direction deviation, and then light beam is incident from the outer conical surface side of outer conical surface lens 206, again reflects, and owing to the plane of refraction of twice refraction is parallel, refractive index is the most identical, and outgoing beam can be parallel with the light beam inciding internal conical surface lens 205, is the hollow beam that optical axis is parallel.
Obtaining the most hollow pump beam of hollow laser beam through above-mentioned orthopedic systems 2 shaping, then it be coupled into laserresonator in the way of end pumping and gain media carried out pumping.
The present embodiment preferred end pumping coupled modes have following several: 1) compound lens systems, spot: couple with spherical lens combination or cylindrical lens combination.2) GRIN Lens coupling: being replaced compound lens by GRIN Lens and couple, advantage is simple in construction, the size of collimation hot spot depends on the numerical aperture of GRIN Lens.3) optical fiber coupling: referring to carry out pump coupling with the LD of band tail optical fiber output, advantage is flexible structure.Fig. 5 is the coupled system schematic diagram being made up of compound lens, and the bigger hollow beam of beam radius is after set of lenses, and output is more easy to the thin hollow beam carrying out pumping, improves pumping efficiency.
The incident gain media in hollow pumping optically pumped laser resonator, owing to the axial portions of laser generation does not has gain, the LG of the vibration that the most generally takes the lead in0,0The gain of mould is pressed less than higher order mode, and hollow higher order mode then takes the lead in vibrating exporting, and obtains hollow beam.By orthopedic systems and coupled system, the ring-type spot size of annular pump light is accurately controlled, makes resonator is formed specific high-order LG0, ± lMode oscillation.Fig. 6 is the laserresonator schematic diagram of one embodiment of the invention, pump light is incident through eyeglass 401, vibrate back and forth between eyeglass 401 and eyeglass 405, gain media 403 is YAG rod, wherein eyeglass 401 is pump light full impregnated, 1064nm is all-trans, and eyeglass 405 has certain reflectivity (non-be all-trans) to 1064nm light, and laser beam is exported by eyeglass 405.
Due to LG0 , +lAnd LG0 , -lHaving identical radial distribution, therefore, in conventional laser resonator, both phase patterns will vibrate together, and stable existence, in this case, and two hollow ring light beam LG0 , +lAnd LG0 , -lAfter being superimposed, the hollow beam of formation is secondary lobe form, as shown in Figure 8.In order to obtain continuous print hollow beam, a kind of phase pattern persistent oscillation in needing to enable resonator, the present invention adds spiral phase plate 402 and cylindrical mirror system in resonator.Wherein, spiral phase plate 402 (as shown in Figure 7) is the pure phase diffractive optical element that the thickness of a kind of optics is directly proportional to rotational orientation angle, is used for changing the phase place of incident beam.Cylindrical mirror system is the cylindrical mirror 404,406 of f and constitutes by focal length, and cylindrical mirror 404 and cylindrical mirror 406 are at a distance of for 2f, and two cylindrical mirrors are symmetrical relative to eyeglass 405, i.e. the distance of eyeglass 405 and two cylindrical mirrors is f.
LG0 , +lPattern has exp (+il θ) phase term, LG0 , -lPattern has exp (-il θ) phase term, and (+the l in Fig. 9 and Figure 10 represents the LG that phase factor is exp (+il θ)0 , +lPattern light beam ,-l represents the LG that phase factor is exp (-il θ)0 , -lPattern light beam).Light beam per pass spiral phase plate 402, phase factor will increase l；When phase factor be ± light beam of l by cylindrical mirror system time, phase factor can negate and become(light beam by after cylindrical mirror 404 by eyeglass 405 reflect again by the effect of cylindrical mirror 404 with pass sequentially through cylindrical mirror 404, eyeglass 405, cylindrical mirror 406 effect identical).
To be calculated as the original position of light beam vibration, LG on the right side of gain media 4030 , +lPattern is after intracavity round trip one week, and phase factor is still+l, meets from the phase distribution reproduced, this LG0 , +lPattern can stable oscillation stationary vibration in resonator, as shown in Figure 9.And LG0 , -lPattern is after intracavity round trip one week, and phase factor becomes+3l, is unsatisfactory for from the phase distribution reproduced, this LG0 , -lPattern can be suppressed in resonator and cannot continue vibration.Therefore, after adding spiral phase plate 402 and cylindrical mirror system in resonator, laser instrument can only export the single order beams of single-phase bit pattern, and the hollow beam so obtained is the most no longer common secondary lobe light beam, but continuous print hollow beam.
Resonator can also increase Q-switching device, form pulse Q and close laser instrument, the Q impulse light beam of output annular；Modulation can also be increased, form locked mode vibration output annular mode locking pulse；It can in addition contain increase frequency multiplication or other frequency conversion device, output frequency multiplication or the annular beam of other frequencies conversion.
The method obtaining hollow laser beam of the present invention, uses intraluminal device that solid plain pump beam is transformed to hollow pump beam.The energy utilizing the hollow beam that the method obtains is more concentrated on ring, by the control to the beam phase that vibrates in the ring-type spot size of annular pump light and laserresonator, it is achieved hollow pattern light beam exports.It is good that the method had quality for outputting laser beam than former method, is more concentrated on ring simultaneously because energy is concentrated so that the slope efficiency of output hollow beam is higher, can be that the output of higher-wattage hollow beam provides a kind of feasible method.Meanwhile, use the method to obtain the device of hollow laser beam, there is low cost, the feature that assembling simply and readily regulates.
Those skilled in the art is easy to understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (10)
1. the method exporting hollow beam, after solid pump light is shaped as hollow pump light, then
Utilize coupled system that coupling pump light is entered laserresonator, in the way of axial end pumping, be situated between in gain
Matter is formed the gain region of hollow form, passes through laser generation, it is achieved the directly output of hollow laser beam, tool
Body step is as follows:
(1) the solid light beam that laser instrument produces, shaped system is shaped as the annular pump light of hollow；
(2) the annular pump light of this hollow, incides coupled system along optical axis, and this coupled system is by described annular
Pump light is transformed into the hollow beam of suitable diameter size；
(3) this hollow beam is coupled into resonator from the end face of laserresonator, to laser gain medium
Carry out pumping, make the gain media absorptive pumping light in described resonator produce continuous print by phase controlling empty
Heart laser exports.
The method of output hollow beam the most according to claim 1, it is characterised in that described continuous print
Hollow laser is by changing the phase place of incident beam continuously so that in resonator, a kind of phase pattern can be held
Persistent oscillation and realize.
The method of output hollow beam the most according to claim 2, it is characterised in that described incident light
The spiral phase plate being arranged in resonator by one that changes continuously of Shu Xiangwei realizes, and this spiral phase plate is light
Learn the phase diffractive optical element that thickness is directly proportional to rotational orientation angle.
4. export a device for hollow beam, for realization, solid pump light is transformed to continuous print hollow pump
Pu light beam, it is characterised in that described solid pump light is the solid laser beam that semiconductor laser sends, this dress
Put and include:
Orthopedic systems (2), after it is arranged on the solid light beam of input, for being shaped as hollow by this solid light beam
Light beam；
Coupling pump light system (3), after it is arranged on described orthopedic systems (2) along light path, for by described
Hollow beam is transformed into the hollow beam of suitable diameter size；
Laserresonator (4), after it is arranged on described coupled system (3) along light path, described suitable diameter is big
Little hollow beam is coupled into resonator from the end face of this laserresonator (4) in the way of end pumping,
Laser gain medium is carried out pumping, is made the gain media absorption pump in described resonator by phase controlling
Pu light produces the output of continuous print hollow laser.
The device of output hollow beam the most according to claim 4, it is characterised in that described shaping system
In system (2) annular with same apex angle by the first outer conical surface speculum (201) and co-axial placement
Empty internal conical surface speculum (202) is constituted, the reflecting surface of the i.e. first outer conical surface speculum (201) and annular
The reflecting surface of hollow internal conical surface speculum (202) is parallel, incident light axis and the first outer conical surface speculum
(201) and annular hollow internal conical surface speculum (202) rotation axes of symmetry overlap, light beam is from the first cylindrical
Conical reflector (201) place is incident, and reflection light is to dissipate annular beam centered by optical axis, and it is through annular
After hollow internal conical surface speculum (202) reflection, with parallel with the incident beam initially entering orthopedic systems
Mode outgoing, is the hollow beam parallel with optical axis.
The device of output hollow beam the most according to claim 4, it is characterised in that described shaping system
System (2) is by internal conical surface speculum (203) and second outer cone with same apex angle placed in contrast
Face speculum (204) is constituted, and this internal conical surface speculum (203) rotation axes of symmetry becomes with incident beam optical axis
135 ° of angles, the rotation axes of symmetry of the second outer conical surface speculum (204) and internal conical surface speculum (203)
Rotation axes of symmetry is parallel, and internal conical surface speculum (203) is with the second outer conical surface speculum (204) summit even
Line is vertical with incident beam optical axis.
The device of output hollow beam the most according to claim 4, it is characterised in that described shaping system
System (2) is had same apex angle, identical refractive index by internal conical surface lens (205) and co-axial placement
Outer conical surface lens (206) constitute, two lens be all side be plane, side is the mirror structure of taper seat,
Wherein the rotation axes of symmetry of taper seat is vertical with plane, and with the light shaft coaxle of incident beam.
8. according to the device of the output hollow beam according to any one of claim 5-7, it is characterised in that
End pumping coupling is combined by spherical lens or cylindrical lens combination carries out coupling, being carried out by GRIN Lens
Couple or realized by optical fiber coupling.
9. according to the device of the output hollow beam according to any one of claim 5-7, it is characterised in that
The first eyeglass (401) that described laserresonator (4) includes setting gradually along optical axis, spiral phase plate (402),
Gain media (403), focal length be cylindrical mirror system that two cylindrical mirrors (404,406) of f constitute and
It is located between two cylindrical mirrors (404,406) distance with two cylindrical mirrors and is second eyeglass (405) of f,
Light beam is incident from described first eyeglass (401), this first eyeglass (401) and the second eyeglass (405) it
Between vibrate back and forth, wherein said light beam per pass spiral phase plate (402), phase factor will increase
Make only to export the single order beams of single-phase bit pattern, thus form continuous print hollow beam.
10. according to the device of the output hollow beam according to any one of claim 5-7, it is characterised in that
Described gain media (403) is YAG rod.
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| CN103941403A (en) * | 2014-03-26 | 2014-07-23 | 中国科学院上海光学精密机械研究所 | Annular light beam generation device |
| CN104601245B (en) * | 2014-12-30 | 2017-02-22 | 浙江大学 | Optical link capable of generating and transmitting radio frequency track angular momentum |
| CN104993365B (en) * | 2015-07-21 | 2018-06-19 | 北京凯普林光电科技股份有限公司 | A kind of pumping source device, laser source device and its design method |
| CN105958311B (en) * | 2016-06-24 | 2019-01-04 | 长春理工大学 | Spherical aberration regulates and controls the area Re Wen and the laser sizing amplification hollow laser of double square |
| JP6104489B1 (en) * | 2016-07-04 | 2017-03-29 | 三菱電機株式会社 | Laser apparatus and laser processing machine |
| CN106896499B (en) * | 2017-04-13 | 2023-05-23 | 中国工程物理研究院应用电子学研究所 | Phase angle-keeping beam blocking ratio regulator |
| CN106970471A (en) * | 2017-05-26 | 2017-07-21 | 北京华岸科技有限公司 | Optical beam transformation device and laser aid |
| CN106990540A (en) * | 2017-05-26 | 2017-07-28 | 北京华岸科技有限公司 | Optical beam transformation device and laser aid |
| US10788664B2 (en) * | 2018-03-22 | 2020-09-29 | Northrop Grumman Systems Corporation | Scanning an optical beam about a field of regard with no moving parts |
| CN108445641A (en) * | 2018-05-11 | 2018-08-24 | 长春理工大学 | A kind of tunable semiconductor laser optical optical tweezers system |
| US11448732B2 (en) * | 2019-05-21 | 2022-09-20 | Northrop Grumman Systems Corporation | Frequency modulated scanning LIDAR with 360 degrees field of view |
| CN111468824B (en) * | 2020-03-12 | 2022-04-05 | 中国科学院微电子研究所 | Light beam focusing device, laser focusing system and method and material stripping method |
| CN113381270A (en) * | 2021-04-21 | 2021-09-10 | 深圳市瑞沃德生命科技有限公司 | Laser and have its laser physiotherapy device |
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| JP2000206411A (en) * | 1999-01-19 | 2000-07-28 | Sharp Corp | Optical device, optical head and information reproducing device using them |
| DE10226280A1 (en) * | 2002-06-13 | 2004-01-08 | Joachim Franek | Beam guidance element has reflective surfaces for generating hollow beam from solid beam (or vice-versa) has odd number of reflective surfaces used for beam deflection |
| US9259594B2 (en) * | 2010-10-18 | 2016-02-16 | Bwt Property, Inc. | Apparatus and methods for deep tissue laser therapy |
| CN102570262B (en) * | 2012-02-29 | 2013-11-20 | 中国科学院上海光学精密机械研究所 | Hollow ring-shaped light beam output solid laser and using method therefor |
| CN203536721U (en) * | 2013-11-04 | 2014-04-09 | 华中科技大学 | Device for outputting hollow laser beam |
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