CN107069414B - Small hundred picosecond laser beauty instrument - Google Patents
Small hundred picosecond laser beauty instrument Download PDFInfo
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- CN107069414B CN107069414B CN201710408352.4A CN201710408352A CN107069414B CN 107069414 B CN107069414 B CN 107069414B CN 201710408352 A CN201710408352 A CN 201710408352A CN 107069414 B CN107069414 B CN 107069414B
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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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
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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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
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Abstract
The invention provides a miniaturized hundred picosecond laser beauty instrument. The miniaturized hundred picosecond laser beauty instrument comprises a first laser rod, a xenon lamp, a second laser rod, a shell, a Q-switched crystal, an output mirror, a small aperture diaphragm, a first polaroid, a rear cavity mirror, a light transmission unit, a second polaroid, a first convex lens, a third total reflection mirror, a fourth total reflection mirror, a 1/4 wave plate, an SBS pool, a fifth total reflection mirror, a 1/2 wave plate, a third polaroid, a nonlinear crystal and a light guide arm; the first laser rod, the xenon lamp and the second laser rod are fixedly arranged in the shell, and the first laser rod, the xenon lamp and the second laser rod are arranged in parallel. According to the hundred-picosecond laser beauty instrument, the first laser rod and the second laser rod are fixed in the same device, the optical path is designed to be compact through the plurality of reflectors, and the second laser rod is used for realizing twice amplification, so that the whole beauty instrument is compact in structure and convenient to use under the condition of obtaining high-energy picosecond laser.
Description
Technical Field
The invention relates to a laser beauty treatment technology, in particular to a miniaturized hundred picoseconds laser beauty treatment instrument.
Background
Currently, nanosecond (ns) lasers are commonly used for laser beauty treatment equipment. However, nanosecond lasers do not perform well in terms of cosmetic properties.
Because the shorter the action time of the laser, the less easily the laser energy absorbed and accumulated in the target tissue is diffused to the surrounding tissue, the energy is limited to the maximum extent in the target object to be treated, the surrounding normal tissue is protected, and the treatment selectivity is stronger.
Achieving higher single pulse energy and higher power under the condition of hundred picosecond laser pulse width is a worldwide problem, and currently, only the Cynosre corporation and the Israel SYNERON corporation in the United states of America have developed hundred picosecond lasers for treating pigmentary diseases and removing tattoos and cosmetology in 2014.
Hundred picosecond lasers produce little thermal loss during interaction and little thermal ablation due to the extremely short pulse width. In the laser medical field, the mechanism of action of hundred picosecond lasers is mainly based on the photodynamic (photoacoustic) effect, while cosmetic lasers and Intense Pulsed Light (IPL) devices with longer pulse periods use the photothermal effect. By virtue of shorter hundred picosecond pulses and higher peak power, the hundred picosecond laser can treat pigmentary skin diseases through fewer treatment courses and better curative effects, effectively remove tattoos, and improve patient comfort, so that the hundred picosecond laser becomes a novel beautifying tool.
At present, two technical routes for obtaining hundred picosecond pulse are mainly adopted, namely a mode locking technology and a short cavity technology. The mode locking technology generally utilizes a mode locking element to obtain a pulse shorter than one nanosecond, and has the advantages of complex debugging, poor stability, low single pulse energy and inconvenient maintenance; the short cavity technology generally adopts LD pumping thin-plate crystal, the resonant cavity is very short, the quality of light beam is relatively poor, and the requirement for cooling water temperature control is high. Both of these methods are expensive to implement high energy hundred picosecond lasers.
Disclosure of Invention
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
In view of this, the invention provides a miniaturized hundred picosecond laser beauty instrument to at least solve the problem that the existing picosecond laser beauty instrument is huge and expensive.
According to one aspect of the present invention, there is provided a miniaturized hundred picosecond laser cosmetic instrument including a first laser rod, a xenon lamp, a second laser rod, a housing, a Q-switched crystal, an output mirror, a pinhole diaphragm, a first polarizer, a rear cavity mirror, a light transmission unit, a second polarizer, a first convex lens, a third total reflection mirror, a fourth total reflection mirror, a 1/4 wave plate, an SBS cell, a fifth total reflection mirror, a 1/2 wave plate, a third polarizer, a nonlinear crystal, and a light guide arm; the output mirror is a partial reflecting mirror; the first laser rod, the xenon lamp and the second laser rod are fixedly arranged in the shell, and the first laser rod, the xenon lamp and the second laser rod are arranged in parallel; along the light transmission direction of the first laser rod, a small aperture diaphragm, a first polaroid and a rear cavity mirror are sequentially arranged on one side of the first laser rod, and a Q-switched crystal and an output mirror are sequentially arranged on the other side of the first laser rod, so that laser oscillates between the output mirror and the rear cavity mirror and is output through the output mirror, p polarized light emitted from the output mirror is incident to one end of a second laser rod after being sequentially changed by 180 degrees through the transmission direction of the light transmission unit, and is emitted from the other end of the second laser rod after being transmitted through the second polaroid; the first convex lens, the third total reflection mirror, the fourth total reflection mirror, the 1/4 wave plate and the SBS pool are sequentially arranged along the emergent light direction of the second laser rod, so that p-polarized light emergent from the other end of the second laser rod is sequentially transmitted through the first convex lens, the third total reflection mirror and the fourth total reflection mirror, then is incident into the 1/4 wave plate, is converted into circularly polarized light through the 1/4 wave plate, then is focused into the SBS pool, and circularly polarized light reversely output from the SBS pool is converted into s-polarized light through the 1/4 wave plate, is sequentially transmitted through the fourth total reflection mirror, the third total reflection mirror, the first convex lens and the second laser rod, then is incident into the second polarizing plate and is reflected by the second polarizing plate; wherein the circularly polarized light reversely output from the SBS cell is Stokes light having a pulse width in the range of 100ps-800 ps; the s-polarized light reflected from the second polarizer is sequentially provided with a fifth total reflection mirror, a 1/2 wave plate, a third polarizer and a nonlinear crystal in the transmission direction, so that the s-polarized light reflected from the second polarizer is converted into p-polarized light through the fifth total reflection mirror and then is output through the 1/2 wave plate, and the p-polarized light output from the 1/2 wave plate is input to the laser input end of the light guide arm after passing through the third polarizer and then is output from the laser output end of the light guide arm.
Further, the output mirror is a 50% reflective, 50% transmissive mirror.
Further, the output mirror comprises a plano-concave lens, and a second convex lens is arranged between the plano-concave lens and the light transmission unit; the plane of the plano-concave lens is coated with a semi-reflective semi-transparent film, the concave surface of the plano-concave lens is coated with an anti-reflective film, so that laser oscillates between the plane of the plano-concave lens and the rear cavity mirror and is output through the plane of the plano-concave lens, and p polarized light emitted from the plane of the plano-concave lens is diffused through the concave surface of the plano-concave lens and is converged into parallel light through the second convex lens, so that beam expansion is realized.
Further, the light transmission unit includes a first total reflection mirror and a second total reflection mirror, wherein the light transmission direction of the p-polarized light emitted from the output mirror is changed by 180 degrees with respect to the light transmission direction of the p-polarized light emitted from the output mirror after being reflected by the first total reflection mirror and the second total reflection mirror, and then is incident to the second polarizing plate.
Further, the light transmission unit includes a right-angle prism, wherein the p-polarized light emitted from the output mirror is perpendicularly incident to the bottom side of the right-angle prism, reflected by two right-angle sides of the right-angle prism in sequence, perpendicularly emitted from the bottom side of the right-angle prism, and then incident to the second polarizer.
There are two methods of achieving picoseconds in general, one is a mode locking technique and the other is a short cavity technique. The mode-locked laser has a complex structure, poor stability and low single-pulse laser energy, and if the high-energy picoseconds required by the beauty instrument are to be realized, the regenerative amplification and the multistage amplifier with extremely complex structures are required, and the construction cost and the maintenance cost are extremely high; the short cavity technology utilizes a laser oscillator with extremely short cavity length to generate a picosecond seed, a diode pumping structure is needed to realize extremely short cavity length, the temperature control of a diode is extremely strict to obtain stable picosecond laser output from the short cavity oscillator, the change of the environmental temperature is sensitive to the temperature control, the system is complex, the cost is high, the stability is poor, and the laser output energy is low due to the fact that the cavity length is too short, and the high-energy picosecond can be achieved by adopting multistage amplification.
Compared with the prior art, the miniaturized hundred-picosecond laser beauty instrument provided by the invention has the advantages that the first amplification of laser is realized through the second laser rod, the hundred-picosecond laser is obtained through the SBS pool, and the obtained hundred-picosecond laser primary path is returned through the second laser rod, so that the second amplification of the laser is realized. The first amplification and the second amplification are realized through the second laser rod, and the second laser rod and the first laser rod are fixed in one device (namely a shell), so that the effects of compact structure and small occupied space of the whole instrument are realized under the condition of amplifying laser for many times. Compared with the existing picosecond beauty instrument, the miniaturized hundred picosecond laser beauty instrument can achieve the good effect of the traditional picosecond beauty instrument, and the picosecond laser is achieved through SBS, and the beauty instrument is more compact in structure and more convenient to use due to the compact light path design of multistage amplification.
In summary, the miniaturized hundred picosecond laser beauty instrument has the beneficial effects that: (1) According to the miniaturized hundred picoseconds laser beauty instrument, the light-gathering cavities of the oscillator and the first-stage amplifier are combined together, so that one light-gathering cavity is reduced, two laser rods can be pumped by using one xenon lamp, the utilization efficiency of pumping light is improved, the structure is compact, the stability of laser output is improved, and the cost is reduced; (2) The miniaturized hundred picosecond laser beauty instrument provided by the invention uses the SBS technology to obtain picosecond laser, the SBS has the energy reflectivity of more than 90%, the energy utilization rate is high, the structure is simple, the cost is low, the SBS has the phase conjugation characteristic, can completely return to the light path along the original path, has the function of auto-collimation, is convenient to adjust, and is beneficial to improving the structural stability; (3) The miniaturized hundred picoseconds laser beauty instrument combines the plane output mirror of the laser oscillator and the concave lens of the first-stage beam expander into one mirror, realizes compact structure, saves one mirror and one adjusting frame, and has better stability. The method has the advantages that only in the invention, the oscillator adopts a flat mirror structure, the output of the oscillator is a small light spot, and the effect can be achieved only when the beam expansion is needed to be matched with a laser amplifying rod at the later stage.
These and other advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings.
Drawings
The invention may be better understood by referring to the following description in conjunction with the accompanying drawings in which like or similar reference numerals are used to indicate like or similar elements throughout the several views. The accompanying drawings, which are included to provide a further illustration of the preferred embodiments of the invention and together with a further understanding of the principles and advantages of the invention, are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic structural view showing one example of a miniaturized hundred picosecond laser cosmetic instrument of the present invention;
fig. 2 is a schematic structural view showing another example of the miniaturized hundred picosecond laser cosmetic instrument of the present invention;
fig. 3 and 4 are structural schematic views showing other two examples of the miniaturized hundred picosecond laser cosmetic instrument of the present invention;
fig. 5 is a schematic view illustrating a plano-concave lens and a second convex lens in the miniaturized hundred picosecond laser cosmetic instrument shown in fig. 2.
Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve the understanding of the embodiments of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system-and business-related constraints, and that these constraints will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It should be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, while other details not greatly related to the present invention are omitted.
The embodiment of the invention provides a miniaturized hundred picosecond laser beauty instrument, which comprises a first laser rod, a xenon lamp, a second laser rod, a shell, a Q-switched crystal, an output mirror, a small aperture diaphragm, a first polaroid, a rear cavity mirror, a light transmission unit, a second polaroid, a first convex lens, a third total reflection mirror, a fourth total reflection mirror, a 1/4 wave plate, an SBS pool, a fifth total reflection mirror, a 1/2 wave plate, a third polaroid, a nonlinear crystal and a light guide arm; the output mirror is a partial reflecting mirror; the first laser rod, the xenon lamp and the second laser rod are fixedly arranged in the shell, and the first laser rod, the xenon lamp and the second laser rod are arranged in parallel; along the light transmission direction of the first laser rod, a small aperture diaphragm, a first polaroid and a rear cavity mirror are sequentially arranged on one side of the first laser rod, and a Q-switched crystal and an output mirror are sequentially arranged on the other side of the first laser rod, so that laser oscillates between the output mirror and the rear cavity mirror and is output through the output mirror, p polarized light emitted from the output mirror is incident to one end of a second laser rod after being sequentially changed by 180 degrees through the transmission direction of the light transmission unit, and is emitted from the other end of the second laser rod after being transmitted through the second polaroid; the first convex lens, the third total reflection mirror, the fourth total reflection mirror, the 1/4 wave plate and the SBS pool are sequentially arranged along the emergent light direction of the second laser rod, so that p-polarized light emergent from the other end of the second laser rod is sequentially transmitted through the first convex lens, the third total reflection mirror and the fourth total reflection mirror, then is incident into the 1/4 wave plate, is converted into circularly polarized light through the 1/4 wave plate, then is focused into the SBS pool, and circularly polarized light reversely output from the SBS pool is converted into s-polarized light through the 1/4 wave plate, is sequentially transmitted through the fourth total reflection mirror, the third total reflection mirror, the first convex lens and the second laser rod, then is incident into the second polarizing plate and is reflected by the second polarizing plate; wherein the circularly polarized light reversely output from the SBS cell is Stokes light having a pulse width in the range of 100ps-800 ps; the s-polarized light reflected from the second polarizer is sequentially provided with a fifth total reflection mirror, a 1/2 wave plate, a third polarizer and a nonlinear crystal in the transmission direction, so that the s-polarized light reflected from the second polarizer is converted into p-polarized light through the fifth total reflection mirror and then is output through the 1/2 wave plate, and the p-polarized light output from the 1/2 wave plate is input to the laser input end of the light guide arm after passing through the third polarizer and then is output from the laser output end of the light guide arm.
Fig. 1 is a block diagram showing an example of a miniaturized hundred picosecond laser cosmetic instrument of the present invention.
As shown in fig. 1, in this example, the miniaturized hundred picosecond laser beauty treatment instrument includes a first laser bar 1, a xenon lamp 2, a second laser bar 3, a housing 4, a Q-switched crystal 5, an output mirror 6, a pinhole diaphragm 7, a first polarizing plate 8, a rear cavity mirror 9, a light transmission unit TR, a second polarizing plate 12, a first convex lens 13, a third total reflection mirror 14, a fourth total reflection mirror 15, a 1/4 wave plate 16, an SBS cell 17, a fifth total reflection mirror 18, a 1/2 wave plate 19, a third polarizing plate 20, a nonlinear crystal 21, and a light guide arm 22. Wherein the first laser bar 1 is, for example, a 3mm×100mm Nd: YAG crystal; the second laser bar 3 is, for example, a 8mm×120mm Nd: YAG crystal; the Q-switched crystal 5 is, for example, a 6mm×10mm Nd: YAG crystal; the first convex lens 13 has a size of, for example, 25.4mm×600mm and a focal length of, for example, 500 to 1500mm; the SBS cell 17 has dimensions of, for example, 25.4mm by 600mm and contains a heavy fluorocarbon liquid medium therein; the nonlinear crystal 21 is, for example, a frequency doubling crystal having a size of 12mm×12 mm.
Wherein the output mirror 6 is a partially reflecting mirror. For example, the output mirror 6 is 50% reflective, 50% transmissive.
The first laser rod 1, the xenon lamp 2 and the second laser rod 3 are fixedly arranged in the shell 4, and the first laser rod 1, the xenon lamp 2 and the second laser rod 3 are arranged in parallel.
In the prior art, it is common to arrange one laser rod and one xenon lamp in one housing, or to arrange each laser rod and its corresponding xenon lamp in the same housing, on the one hand, and on the other hand, a plurality of xenon lamps and a plurality of housings. In order to provide multistage amplification and achieve the purpose of compact structure, the invention provides a scheme that a xenon lamp and two laser rods are arranged in a shell. In this scheme, the xenon lamp and the two laser bars are arranged in parallel, and the xenon lamp is located in the middle, as shown in fig. 1, so that when the xenon lamp works, it can pump the two laser bars simultaneously to generate laser light, and can realize secondary amplification by using one laser bar (the second laser bar 3).
Along the light transmission direction of the first laser rod 1, a small aperture diaphragm 7, a first polaroid 8 and a rear cavity mirror 9 are sequentially arranged on one side of the first laser rod 1, and a Q-switched crystal 5 and an output mirror 6 are sequentially arranged on the other side of the first laser rod 1.
Thus, after the power is turned on, the xenon lamp 2 emits pulsed light, which excites the first laser bar 1 to generate laser light, which oscillates reciprocally between the output mirror 6 and the rear cavity mirror 9 and is output through the output mirror 6. Wherein the rear cavity mirror 9 is a total reflection mirror.
That is, the rear mirror 9, the first polarizing plate 8, the aperture stop 7, the first laser rod 1, the Q-switched crystal 5, and the output mirror 6 together constitute a nanosecond laser generation light source having a spot diameter of 2mm and a polarization state of p-polarized light in this order.
The p-polarized light emitted from the output mirror 6 is sequentially changed by 180 degrees in the transmission direction after passing through the light transmission unit TR, is then transmitted through the second polarizing plate 12 (transmitted), is incident on one end of the second laser rod 3 (i.e., the a end of the second laser rod 3), and is emitted from the other end of the second laser rod 3 (i.e., the B end of the second laser rod 3).
Thereby, a first amplification of the laser light is achieved by the second laser bar 3. For example, the laser beam output from the output mirror 6 has an energy of 10mJ and a pulse width of 8ns, and the energy becomes 100mJ (the pulse width is still 8 ns) after passing through the second laser bar 3.
The first convex lens 13, the third total reflection mirror 14, the fourth total reflection mirror 15, the 1/4 wave plate 16 and the SBS pool 17 are sequentially arranged along the emergent light direction of the second laser rod 3, so that p-polarized light (for example, energy of 100mJ and pulse width of 8 ns) emergent from the other end of the second laser rod 3 is sequentially incident to the 1/4 wave plate 16 after passing through the first convex lens 13, the third total reflection mirror 14 (reflection) and the fourth total reflection mirror 15 (reflection), is focused into the SBS pool 17 after being converted into circularly polarized light by the 1/4 wave plate 16, and circularly polarized light reversely output from the SBS pool 17 is converted into s-polarized light after passing through the fourth total reflection mirror 15 (reflection), the third total reflection mirror 14 (reflection), the first convex lens 13 and the second laser rod 3, is incident to the second polarizing plate 12 and is reflected by the second polarizing plate 12; wherein the circularly polarized light reversely output from the SBS cell 17 is Stokes light having a pulse width in the range of 100ps-800 ps.
In this way, the hundred picosecond laser is obtained through the SBS pool 17, and the obtained hundred picosecond laser is returned to pass through the second laser rod 3, so that the secondary amplification of the laser is realized. For example, after the hundred picosecond laser enters the second laser rod 3 from the B end and is output from the a end, the energy becomes 300mJ, for example. Moreover, the first amplification and the second amplification are realized through the second laser rod 3, and the second laser rod 3 and the first laser rod 1 are fixed in one device (namely the shell 4), so that the structure of the whole instrument is compact and the occupied space is smaller under the condition of amplifying laser for many times.
The fifth total reflection mirror 18, the 1/2 wave plate 19, the third polarizing plate 20 and the nonlinear crystal 21 are sequentially arranged in the transmission direction of the s-polarized light reflected from the second polarizing plate 12, so that the s-polarized light reflected from the second polarizing plate 12 is converted into p-polarized light output through the fifth total reflection mirror 18 (reflection) and then through the 1/2 wave plate 19 (reflection), and the p-polarized light output from the 1/2 wave plate 19 is input to the laser input end of the light guide arm 22 through the third polarizing plate 20 and then through the nonlinear crystal 21, and is output from the laser output end of the light guide arm 22. The nonlinear crystal 21 can multiply the frequency of the infrared laser light of about 1064nm to green light of 532 nm. The light guiding arm 22 may have a similar structure to that of the existing laser beauty instrument, and will not be described in detail herein.
Thus, the above-mentioned structure of the present invention is achieved by fixing the second laser bar 3 and the first laser bar 1 in one device (i.e., the housing 4), by making the optical path design more compact by a plurality of mirrors, and by implementing two amplifications by the second laser bar 3, by combining the above features, the light source portion of the whole instrument is made very compact, occupies a small space, and thus, a high energy output of hundred picosecond laser is obtained.
Further, as shown in fig. 1, the polarization direction of light is adjusted by adjusting the optical axis of the 1/2 wave plate 19, and thus the energy of the light beam transmitted through the third polarizing plate 20 is adjusted. Thus, the laser energy output from the nonlinear crystal 21 can be adjusted between 0 and 300mJ, for example.
Fig. 2 is a block diagram showing another example of the miniaturized hundred picosecond laser cosmetic instrument of the present invention.
As shown in fig. 2, unlike the structure shown in fig. 1, the output mirror 6 is a plano-concave lens 6-1, and a second convex lens 6-2 is further provided between the plano-concave lens 6-1 and the light transmission unit TR.
Wherein the plane of the plano-concave lens 6-1 is coated with a semi-reflective semi-transparent film, the concave surface of the plano-concave lens 6-1 is coated with an antireflection film, as shown in fig. 5, so that laser oscillates between the plane of the plano-concave lens 6-1 and the rear cavity mirror 9 and is output through the plane of the plano-concave lens 6-1, and p polarized light emitted from the plane of the plano-concave lens 6-1 is diffused through the concave surface of the plano-concave lens 6-1 and converged into parallel light by the second convex lens 6-2, thereby realizing beam expansion.
To achieve beam expansion, the conventional technology often needs to add a combination of concave and convex lenses, that is, it is equivalent to adding 2 lens elements between the output mirror 6 and the light transmission unit TR, and the lens elements must design the optical path in consideration of the focal length thereof, so that the entire optical path becomes long and the entire instrument structure becomes large. In contrast, the miniaturized hundred picosecond laser beauty instrument of the present invention as shown in fig. 2 and 5 only needs to replace the output mirror 6 with the plano-concave lens 6-1, and only needs to add one more convex lens, on one hand, the elements are smaller than those of the prior art, and on the other hand, the optical path is shorter, so that the structure of the present invention is more compact than that of the prior art.
The same light path portion as in fig. 1 in fig. 2 is similar in principle and function to the structure shown in fig. 1, and will not be described here again.
Further, according to one implementation (as shown in fig. 1 and 2), the light transmission unit TR includes a first total reflection mirror 10 and a second total reflection mirror 11, wherein the p-polarized light exiting from the output mirror 6 is reflected by the first total reflection mirror 10 and the light transmission direction reflected by the second total reflection mirror 11 is changed by 180 degrees with respect to the p-polarized light exiting from the output mirror 6, and then enters the second polarizing plate 12.
Although fig. 1 and 2 show an example in which the light transmission unit TR includes the first total reflection mirror 10 and the second total reflection mirror 11, the structure of the light transmission unit TR is not limited thereto, and may be, for example, a right-angle triangular prism as shown in fig. 3 or 4. As shown in fig. 3 or 4, according to another implementation manner, the light transmission unit TR may also include a right-angle triangular prism, wherein the p-polarized light emitted from the output mirror 6 is perpendicularly incident to the bottom side of the right-angle triangular prism, is sequentially reflected by two right-angle sides of the right-angle triangular prism, perpendicularly exits from the bottom side of the right-angle triangular prism, and then is incident to the second polarizer 12.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is defined by the appended claims.
Claims (4)
1. The miniaturized hundred picosecond laser beauty instrument is characterized by comprising a first laser rod (1), a xenon lamp (2), a second laser rod (3), a shell (4), a Q-switched crystal (5), an output lens (6), a small aperture diaphragm (7), a first polaroid (8), a rear cavity mirror (9), a light transmission unit (TR), a second polaroid (12), a first convex lens (13), a third total reflection mirror (14), a fourth total reflection mirror (15), a 1/4 wave plate (16), an SBS pool (17), a fifth total reflection mirror (18), a 1/2 wave plate (19), a third polaroid (20), a nonlinear crystal (21) and a light guide arm (22);
the output mirror (6) is a partial reflector;
the first laser rod (1), the xenon lamp (2) and the second laser rod (3) are fixedly arranged in the shell (4), and the first laser rod (1), the xenon lamp (2) and the second laser rod (3) are arranged in parallel;
the small aperture diaphragm (7), the first polaroid (8) and the rear cavity mirror (9) are sequentially arranged on one side of the first laser rod (1) along the light transmission direction of the first laser rod (1), the Q-switched crystal (5) and the output mirror (6) are sequentially arranged on the other side of the first laser rod (1), so that laser oscillates between the output mirror (6) and the rear cavity mirror (9) and is output through the output mirror (6), p-polarized light emitted from the output mirror (6) is incident to one end of the second laser rod (3) after being sequentially changed by 180 degrees through the transmission direction of the light transmission unit (TR) after being transmitted through the second polaroid (12), and is emitted from the other end of the second laser rod (3) so as to realize first amplification of the laser through the second laser rod (3);
the first convex lens (13), the third total reflecting mirror (14), the fourth total reflecting mirror (15), the 1/4 wave plate (16) and the SBS pool (17) are sequentially arranged along the emergent light direction of the second laser rod (3), so that p polarized light emergent from the other end of the second laser rod (3) sequentially passes through the first convex lens (13), the third total reflecting mirror (14) and the fourth total reflecting mirror (15) and then enters the 1/4 wave plate (16), is converted into circularly polarized light through the 1/4 wave plate (16), is focused into the SBS pool (17), and circularly polarized light reversely output from the SBS pool (17) is converted into s polarized light through the 1/4 wave plate (16), sequentially passes through the fourth total reflecting mirror (15), the third total reflecting mirror (14), the first convex lens (13) and the second laser rod (3) and then enters the second polarizing plate (12), and is reflected by the second polarizing plate (12); the circularly polarized light reversely output from the SBS pool (17) is a hundred picosecond laser of Stokes light with a pulse width in the range of 100ps-800ps, and the hundred picosecond laser is returned to the second laser rod (3) to realize secondary amplification of the laser;
the fifth total reflection mirror (18), the 1/2 wave plate (19), the third polarizing plate (20) and the nonlinear crystal (21) are sequentially arranged in the transmission direction of the s-polarized light reflected from the second polarizing plate (12), so that the s-polarized light reflected from the second polarizing plate (12) is converted into p-polarized light through the fifth total reflection mirror (18) and then is converted into p-polarized light through the 1/2 wave plate (19), and the p-polarized light output from the 1/2 wave plate (19) is transmitted through the third polarizing plate (20) and then is input to the laser input end of the light guide arm (22) through the nonlinear crystal (21) so as to be output from the laser output end of the light guide arm (22); the output mirror (6) comprises a plano-concave lens (6-1), and a second convex lens (6-2) is arranged between the plano-concave lens (6-1) and the light transmission unit (TR);
the plane of the plano-concave lens (6-1) is coated with a semi-reflective semi-transparent film, the concave surface of the plano-concave lens (6-1) is coated with an anti-reflective film, so that laser oscillates between the plane of the plano-concave lens (6-1) and the rear cavity mirror (9) and is output through the plane of the plano-concave lens (6-1), and p polarized light emitted from the plane of the plano-concave lens (6-1) is diffused through the concave surface of the plano-concave lens (6-1) and is converged by the second convex lens (6-2) to become parallel light, so that beam expansion is realized.
2. The miniaturized hundred picosecond laser cosmetic instrument according to claim 1, characterized in that the output mirror (6) is a 50% reflective, 50% transmissive mirror.
3. The miniaturized hundred picosecond laser cosmetic instrument according to claim 1, wherein the light transmission unit (TR) comprises a first total reflection mirror (10) and a second total reflection mirror (11), wherein the p-polarized light emitted from the output mirror (6) is reflected by the first total reflection mirror (10) and the light transmission direction after being reflected by the second total reflection mirror (11) is changed by 180 degrees with respect to the light transmission direction of the p-polarized light emitted from the output mirror (6), and is then incident to the second polarizing plate (12).
4. The miniaturized hundred picosecond laser cosmetic instrument according to claim 1, wherein the light transmission unit (TR) comprises a right-angle triangular prism, wherein the p-polarized light emitted from the output mirror (6) is perpendicularly incident to the bottom side of the right-angle triangular prism, is sequentially reflected by two right-angle sides of the right-angle triangular prism, is perpendicularly emitted from the bottom side of the right-angle triangular prism, and is then incident to the second polarizing plate (12).
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| CN107834350B (en) * | 2017-12-18 | 2019-08-02 | 中国科学院合肥物质科学研究院 | A kind of alexandrite medical laser of multi-mode |
| CN113300200B (en) * | 2021-04-07 | 2023-04-18 | 清华大学 | Pulse laser |
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