CN213042074U

CN213042074U - Optical fiber laser beam dodging and shaping device

Info

Publication number: CN213042074U
Application number: CN202022384132.2U
Authority: CN
Inventors: 袁春华
Original assignee: Shenzhen Gsd Tech Co ltd
Current assignee: Shenzhen Gsd Tech Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-04-23
Anticipated expiration: 2030-10-23

Abstract

The utility model discloses an even light shaping device of optic fibre laser beam relates to medical laser technical field. The laser fiber laser therapy device comprises a laser fiber connected with a laser therapy machine, a right-angle triple prism and a light guide crystal, wherein the right-angle triple prism comprises a first right-angle surface and a second right-angle surface; the laser optical fibers and the light guide crystal are distributed at an angle of 90 degrees; the laser beam emitted by the laser therapeutic machine passes through the laser fiber, the right-angle triple prism and the light guide crystal in sequence. The laser beam light homogenizing and shaping device is simple in structure, the isosceles right triangular prism is used as a light guiding and steering element, the laser beam transmission efficiency is high, the output light spot energy is uniformly distributed, the device is stable in performance, long in service life and safe and reliable to use; has very obvious effect on the treatment of hirsutism, brings great convenience to patients and improves the use experience of users.

Description

Optical fiber laser beam dodging and shaping device

Technical Field

The utility model belongs to the technical field of medical laser, concretely relates to even light plastic output device of optic fibre laser beam.

Background

With the development of laser medical technology, the fiber laser and the laser therapy machine adopting fiber coupling output are more and more widely applied to medical cosmetology at present, and particularly have obvious effect on the treatment of hirsutism, namely laser depilation. However, this type of laser is limited by the minimum radius of curvature of the bent optical fiber, and the output beam of the terminal of the optical fiber usually requires an additional optical element to perform beam steering and shape the light beam by the light guide crystal to form a uniform light spot of a certain size for the treatment of a patient.

The laser beam output by the common optical fiber is turned in two modes, namely, turning by a light guide pipe and turning by a 45-degree reflector. As shown in fig. 1, one end of a laser fiber 1 is connected with a laser 11, the other end of the laser fiber 1 is further provided with a bent fiber (optical waveguide) for turning, the bent angle θ is almost close to 90 °, the turned laser beam is irradiated into a light guide crystal 6, the laser is easy to leak from the side surface of the bent part (as shown by the arrow in fig. 2), and the laser beam transmission efficiency is low, and the quality of the laser beam is easy to reduce.

As shown in fig. 2, the laser beam output from the fiber is turned by a 45 ° mirror. Although the reflector steering has the advantage of compact structure, the output light beam of the optical fiber is a divergent light beam, the incidence angle range is large, and the reflection is easily influenced by the incidence angle. Aiming at the commonly adopted dielectric film reflecting mirror as a steering reflecting mirror at present, the steered laser beam is incident to the light guide crystal 6; because the reflector is very close to the end face of the optical fiber, the peak power of the laser is high, the high-reflection dielectric film of the front reflecting surface 121 on the reflector 12 is easily damaged in the long-time use process, once the high-reflection dielectric film is damaged, the laser beam directly penetrates through the reflector 12 and is reflected from the rear reflecting surface 122, the laser is leaked to reach a treatment handle or other places, the plastic shell of the treatment handle is burnt out, and the burnt plastic shell of the treatment handle is penetrated by the laser to cause human body injury to an operator.

In addition, the existing light guide crystal for shaping laser beams usually adopts a one-section crystal and directly utilizes one end of the light guide crystal to be obliquely cut by 45 degrees to form a light guide reflection surface as a steering reflector for use, and as the steering reflection surface and the light guide crystal are integrated, a refrigeration function is usually required to be added on the light transmission surface of the light guide crystal to cool the skin surface, so that high-heat-conduction materials such as artificial sapphire and the like are usually used as a window; however, the inner wall of the window is easy to dewfall, and the steering reflecting surface dewfalls due to heat conduction, so that the light beam transmission efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and provide a laser beam transmission device which has simple structure, high laser beam transmission efficiency, uniform output facula energy, stable performance, long service life and safe and reliable use; the optical fiber laser beam homogenizing and shaping output device has a very obvious effect on the treatment of hirsutism and brings great convenience to patients.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

an optical fiber laser beam dodging and shaping device comprises a laser fiber connected with a laser therapeutic machine, a right-angle triple prism and a light guide crystal, wherein the right-angle triple prism comprises a first right-angle surface and a second right-angle surface; the laser optical fibers and the light guide crystal are distributed at an angle of 90 degrees; the laser beam emitted by the laser therapeutic machine passes through the laser fiber, the right-angle triple prism and the light guide crystal in sequence.

Preferably, the right-angle triple prism is an isosceles right-angle triple prism.

Preferably, the light guide crystal comprises an upper light passing surface, the upper light passing surface corresponds to the second right-angle surface, a laser beam enters the light guide crystal from the upper light passing surface, and the first right-angle surface, the second right-angle surface and the upper light passing surface are plated with high antireflection films.

Preferably, the light guide crystal adopts a light homogenizing pipe with a cuboid structure, the upper light passing surface is square or rectangular, and the light guide crystal and the laser beam which emits the second right-angle surface are coaxially arranged.

Preferably, the device also comprises a box body and a fixing clamp, wherein the box body is positioned at the lower end of the laser fiber and is positioned at one side of the light guide crystal, the fixing clamp is fixed on the outer wall of the box body and is positioned between the laser fiber and the right-angle prism, and a clamping groove is formed in the fixing clamp and is used for clamping an optical fiber head of the laser fiber; the fixing clamp is characterized in that a prism fixing seat is further extended along the direction of the right-angle triple prism, the prism fixing seat is located between the right-angle triple prism and the light guide crystal, and the right-angle triple prism is fixed on the prism fixing seat.

Preferably, the clamping groove is also internally provided with a light through hole, and the laser beam is transmitted to the right-angle triple prism along the light through hole.

Preferably, the laser fiber armored protective sleeve comprises a fixing support, the fixing support is fixed on the outer wall of the box body, the laser fiber is provided with the optical fiber armored protective sleeve, and the fixing support is used for fixing the optical fiber armored protective sleeve.

Preferably, still include cooling device, cooling device includes refrigeration piece and cooling seat, the refrigeration piece is located between box and the cooling seat, the lower extreme laminating of one side and the box of refrigeration piece, the opposite side of refrigeration piece and the upper end laminating of cooling seat, the leaded light crystal is fixed in the side of cooling seat.

Preferably, the box body is of a hollow structure, the box body is provided with a cooling water through hole, and the box body is used for emitting heat of the refrigerating sheet.

Preferably, the refrigeration piece is a TEC refrigeration piece, and the cooling seat is made of metal copper plated with gold on the surface.

Preferably, the right-angle triple prism is made of sapphire crystal material; the light guide crystal is a high-transmittance crystal.

Preferably, the light guide crystal is one of a sapphire crystal or a quartz crystal.

Compared with the prior art, the beneficial effects of the utility model reside in that: an optical fiber laser beam dodging and shaping device comprises a laser fiber connected with a laser therapeutic machine, a right-angle triple prism and a light guide crystal, wherein the right-angle triple prism comprises a first right-angle surface and a second right-angle surface; the laser optical fibers and the light guide crystal are distributed at an angle of 90 degrees; the laser beam emitted by the laser therapeutic machine passes through the laser fiber, the right-angle triple prism and the light guide crystal in sequence. The laser beam light homogenizing and shaping device is simple in structure, the light guide steering element adopts a right-angle triple prism to replace a currently common 45-degree dielectric film reflector, high antireflection films near incident wavelengths are plated on two right-angle surfaces and a light passing surface on the light guide crystal, the laser beam steering is carried out by adopting a total reflection principle, the laser beam is prevented from being refracted out of the right-angle triple prism, the problem of light leakage of the laser beam from a lens after the 45-degree dielectric film reflector film layer is damaged is solved, the possible damage of the light leakage to a patient or an operator is avoided, the isosceles right-angle triple prism is adopted as the light guide steering element, the laser beam transmission efficiency is high, the energy distribution of output light spots is uniform, the device is stable in performance, long; the optical fiber laser therapy device is matched with a medical laser therapy machine for conducting optical fibers, has very remarkable effect on the treatment of hirsutism, brings great convenience to patients, and improves the use experience of users.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the mechanisms shown in the drawings without creative efforts.

FIG. 1 is a prior art block diagram of the background of the invention;

FIG. 2 is a prior art block diagram of another prior art embodiment of the present invention;

fig. 3 is a structural diagram of a fiber laser beam dodging and shaping device according to an embodiment of the present invention;

FIG. 4 is a sectional view taken along A-A of FIG. 3;

fig. 5 is an exploded view of an optical fiber laser beam dodging and shaping device according to an embodiment of the present invention;

in the figure, 1 is a laser fiber, 101 is a fiber armor protective sleeve, 102 is a fiber head, 2 is a fixed support, 3 is a fixing clamp, 4 is a right-angle prism, 5 is a prism fixing seat, 6 is a light guide crystal, 7 is a cooling seat, 8 is a refrigeration sheet, 9 is a box body, 10 is a cooling water inlet, 11 is a laser, 12 is a reflector, 121 is a front reflecting surface, and 122 is a rear reflecting surface.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.

In the description of the present application, it is to be understood that the terms "intermediate," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus should not be construed as limiting the present application. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In addition, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean, for example, that there may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1:

referring to fig. 3-5, an optical fiber laser beam dodging and shaping device comprises a laser fiber 1 connected with a laser therapy apparatus, a right-angle triple prism 4 and a light guide crystal 6, wherein the right-angle triple prism 4 comprises a first right-angle surface and a second right-angle surface, the laser fiber 1 is arranged on one side of the first right-angle surface, and the light guide crystal 6 is arranged on one side of the second right-angle surface; the laser optical fiber 1 and the light guide crystal 6 are distributed at an angle of 90 degrees; the laser beam emitted by the laser therapeutic machine passes through the laser fiber 1, the right-angle triple prism 4 and the light guide crystal 6 in sequence.

Specifically, this device is used for carrying out the plastic with the laser beam of laser therapeutic instrument output, including laser fiber 1, right triangular prism 4, light guide crystal 6, in this embodiment, right triangular prism 4 is isosceles right triangular prism, right triangular prism 4 includes first right angle face, the second right angle face, laser fiber 1 sets up with the first right angle face of right triangular prism 4 is corresponding, light guide crystal 6 sets up with the second right angle face of right triangular prism 4 is corresponding, laser fiber 1 is 90 with light guide crystal 6 and lays, concretely, 1 level of laser fiber sets up, 6 vertical settings of light guide crystal, and mutually perpendicular intersects in right triangular prism 4. The laser beam emitted by the laser therapeutic machine passes through the laser fiber 1, the right-angle triple prism 4 and the light guide crystal 6 in sequence, and in the process, the laser beam is turned by the right-angle triple prism 4 and then is transmitted, homogenized and shaped through the light guide crystal 6.

Specifically, this device still includes box 9, mounting fixture 3, box 9 is located the lower extreme of laser fiber 1, and is located the left side of leaded light crystal 6, mounting fixture 3 is fixed in the outer wall of box 9, and is located between laser fiber 1 and the right angle prism 4, the last card solid groove that is equipped with of mounting fixture 3, the card solid groove is used for the optical fiber head 102 of card solid laser fiber 1, optical fiber head 102 closely cooperates at the card solid inslot, but the laser beam of card solid groove accurate positioning follow optical fiber head 102 output. In a specific embodiment, the fastening groove is further provided with a light through hole, and the laser beam is transmitted to the first right-angle surface of the right-angle triple prism 4 along the light through hole. Fixing fixture 3 has still extended prism fixing base 5 along right angle prism 4 direction, and prism fixing base 5 is located between right angle prism 4 and light guide crystal 6, and right angle prism 4 is fixed in on prism fixing base 5 through the bolt-up. In a specific embodiment, the optical fiber protection device further comprises a fixing support 2, the fixing support 2 is fixed on the outer wall of the box body 9, the laser optical fiber 1 is provided with an optical fiber armored protective sleeve 101, and the fixing support 2 is used for fixing the optical fiber armored protective sleeve 101 to prevent the optical fiber from loosening.

Specifically, the surface of the light guide crystal 6 corresponding to the second right-angle surface is an upper light-passing surface, the laser beam enters the light guide crystal 6 from the upper light-passing surface, the first right-angle surface, the second right-angle surface and the upper light-passing surface are plated with high antireflection films near the incident wavelength, and the reflection of the surface to the laser can be reduced, the loss of the laser beam in the transmission process is reduced, and the transmission efficiency of the laser is improved.

Specifically, the light guide crystal 6 is a light homogenizing tube with a cuboid structure, the upper light passing surface is square or rectangular, the optical fiber head 102 of the laser fiber 1 and the first right-angle surface of the right-angle triangular prism 4 are coaxially arranged, and the light guide crystal 6 and the laser beam emitting out of the second right-angle surface are coaxially arranged. In a specific embodiment, the right triangular prism 4 is made of sapphire crystal material, and it can be known from the basic principle of geometric optics that the larger the refractive index of the right triangular prism 4 is, the more easily the laser beam incident on the inclined surface of the right triangular prism 4 is totally reflected. In the device, the sapphire crystal is used as the right-angle triple prism 4, so that the refractive index completely meets the requirement of total reflection when the laser beam in the whole divergence angle emitted by the optical fiber head 102 passes through the inclined plane of the right-angle triple prism 4, and the laser beam can be totally reflected; the problem that laser beams leak from the upper part of the inclined plane of the right-angle triple prism 4 due to the fact that the condition of total reflection is not met due to low refractive index is solved, and not only can laser be difficultly gathered and turned to be realized, but also transmission efficiency is reduced, and personal injury can be even brought to a user. It should be pointed out that, the utility model discloses a right angle prism 4 of sapphire crystal material utilizes the inherent physical characteristic of total reflection to realize the laser beam reflection completely and turns to, has thoroughly abandoned the mode that adopts the preceding plane of reflection 121 of 45 speculum 12 among the prior art to plate high anti-membrane and realize the laser beam reflection and turn to, and prior art is shown in fig. 2, has avoided totally because high anti-membrane damages to lead to laser to pass 45 speculum 12 and jets out along back plane of reflection 122 and form laser leakage, harm that probably causes patient or operator.

Specifically, still include cooling device, cooling device includes refrigeration piece 8 and cooling seat 7, and refrigeration piece 8 is located between box 9 and the cooling seat 7, and one side of refrigeration piece 8 closely laminates with the lower extreme of box 9, and the opposite side of refrigeration piece 8 and the upper end laminating of cooling seat 7, leaded light crystal 6 are fixed in the side of cooling seat 7, and refrigeration piece 8 is used for cooling to cooling seat 7. In a specific embodiment, the refrigerating plate 8 is a TEC refrigerating plate 8, the cooling seat 7 is metal copper plated with gold on the surface, the metal copper is favorable for improving the thermal conductivity to achieve the purpose of rapid refrigeration, and the box body 9 is used for dissipating heat of the refrigerating plate 8; the box 9 is hollow water tank, and box 9 is equipped with cooling limbers 10, and cooling limbers 10 includes water filling port and delivery port, and the refrigerated combined action of cooling water refrigeration and TEC conduction refrigeration has furthest guaranteed refrigerated quick and accuracy. In the laser treatment process, the cooling seat 7 is used for cooling the skin surface of a patient to reduce pain. Light guide crystal 6 is fixed in the side of cooling seat 7, and cooling seat 7 side is equipped with the fixed slot that is used for fixed light guide crystal 6, and light guide crystal 6 passes this fixed slot and closely laminates with the fixed slot inner wall, and the heat-conduction of being more favorable to makes skin surface refrigeration effect better during the treatment.

Specifically, the light guide crystal 6 is a high transmittance crystal, and the light guide crystal 6 may be one of a sapphire crystal or a quartz crystal. In this embodiment, the light guide crystal 6 is a sapphire crystal, in a specific embodiment, the light guide crystal 6 is a square structure, and the upper light-passing surface of the light guide crystal 6 is square or rectangular, so as to meet the treatment requirements of affected parts with different sizes and shapes; the light beam is a circular light spot before entering the light guide crystal, namely the intensity of the light beam is Gaussian distributed before the laser beam enters the light guide crystal (the intensity of the light spot is strong in the middle and weak at the edge); after passing through the light guide crystal 6, the laser beam irradiates along the lower light passing surface to form square or rectangular light spots, that is, the intensity of the laser beam irradiating along the lower light passing surface is flat-top distribution (the light intensity distribution of the whole light spot is uniform). In this embodiment, the light guide crystal 6 with high transmittance near the laser wavelength is selected, so that the efficiency of the laser light transmitting through the light guide crystal 6 can be improved, and the light guide crystal 6 with good heat conductivity is selected, so that the quick refrigeration of the lower light passing surface is facilitated, and the unhairing effect of the freezing point is quickly achieved.

An optical fiber laser beam dodging and shaping device comprises a laser fiber 1 connected with a laser therapeutic machine, a right-angle triple prism 4 and a light guide crystal 6, wherein the right-angle triple prism 4 comprises a first right-angle surface and a second right-angle surface, the laser fiber 1 is arranged on one side of the first right-angle surface, and the light guide crystal 6 is arranged on one side of the second right-angle surface; the laser optical fiber 1 and the light guide crystal 6 are distributed at an angle of 90 degrees; the laser beam emitted by the laser therapeutic machine passes through the laser fiber 1, the right-angle triple prism 4 and the light guide crystal 6 in sequence.

The laser beam even light shaping device is matched with a laser therapeutic machine of fiber coupling output for use, the middle waist right angle triple prism in the application carries out total reflection steering on divergent laser beams emitted from a laser fiber 1, the transmission efficiency is high, the laser beams are not influenced by different incident angles of the divergent laser, the laser beams enter a light guide crystal 6 for conduction after steering, the isosceles right angle triple prism 4 and the light guide crystal 6 of the device adopt a separated design, the heat conduction process is effectively blocked, the isosceles right angle triple prism 4 is prevented from dewing due to cooling, the reduction of the transmission efficiency of the isosceles right angle triple prism 4 caused by dewing is avoided, finally, the laser beams are shaped and homogenized through the light guide crystal 6, a square or rectangular facula with accurate size and uniform energy is formed, the laser beams after shaping have the characteristics of good directivity and consistent divergent angles in all directions, the utility model is used for the medical cosmetic industry, has the advantages of safety, high efficiency and obvious effect during treatment.

The laser beam light homogenizing and shaping device is simple in structure, the light guide steering element adopts the right-angle triple prism 4 to replace a 45-degree dielectric film reflecting mirror commonly used at present, and high antireflection films near incident wavelengths are plated on the two right-angle surfaces and the light passing surface of the light guide crystal 6, so that reflection damage loss when laser passes through the light guide crystal is reduced, and transmission efficiency is improved. The laser beam steering is carried out by adopting a total reflection principle, so that the laser beam is prevented from being refracted out of the right-angled triangular prism 4, the problem of light leakage of the laser beam from a lens after a 45-degree dielectric film reflecting mirror film layer is damaged is solved, the possible damage to a patient or an operator caused by the light leakage is avoided, the isosceles right-angled triangular prism is used as a light guiding steering element, the laser beam transmission efficiency is high, the energy distribution of output light spots is uniform, the device is stable in performance, long in service life and safe and reliable to use; has very obvious effect on the treatment of hirsutism, brings great convenience to patients, and improves the use experience and treatment effect of users.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The optical fiber laser beam dodging and shaping device comprises a laser optical fiber connected with a laser therapeutic machine, and is characterized by further comprising a right-angle triangular prism and a light guide crystal, wherein the right-angle triangular prism comprises a first right-angle surface and a second right-angle surface, the laser optical fiber is arranged on one side of the first right-angle surface, and the light guide crystal is arranged on one side of the second right-angle surface; the laser optical fibers and the light guide crystal are distributed at an angle of 90 degrees; the laser beam emitted by the laser therapeutic machine passes through the laser fiber, the right-angle triple prism and the light guide crystal in sequence.

2. The fiber laser beam homogenizing and shaping device according to claim 1, wherein the right triangular prism is an isosceles right triangular prism.

3. The optical fiber laser beam dodging and shaping device according to claim 2, wherein the light guide crystal comprises an upper light passing surface, the upper light passing surface corresponds to the second right-angle surface, the laser beam is incident on the light guide crystal from the upper light passing surface, and the first right-angle surface, the second right-angle surface and the upper light passing surface are coated with high antireflection films.

4. The optical fiber laser beam dodging and shaping device according to claim 3, wherein the light guide crystal is a dodging tube with a rectangular structure, the upper light passing surface is square or rectangular, and the light guide crystal and the laser beam emitting from the second right-angle surface are coaxially arranged.

5. The optical fiber laser beam dodging and shaping device according to claim 4, further comprising a box body and a fixing clamp, wherein the box body is located at the lower end of the laser optical fiber and located on one side of the light guide crystal, the fixing clamp is fixed on the outer wall of the box body and located between the laser optical fiber and the right-angle triple prism, and a clamping groove is formed in the fixing clamp and used for clamping an optical fiber head of the laser optical fiber; the fixing clamp is characterized in that a prism fixing seat is further extended along the direction of the right-angle triple prism, the prism fixing seat is located between the right-angle triple prism and the light guide crystal, and the right-angle triple prism is fixed on the prism fixing seat.

6. The optical fiber laser beam dodging and shaping device according to claim 5, further comprising a fixing bracket fixed to an outer wall of the box body, wherein the laser fiber is provided with a fiber armored protective sleeve, and the fixing bracket is used for fixing the fiber armored protective sleeve.

7. The optical fiber laser beam dodging and shaping device according to claim 6, further comprising a cooling device, wherein the cooling device comprises a refrigeration piece and a cooling seat, the refrigeration piece is located between the box body and the cooling seat, one side of the refrigeration piece is attached to the lower end of the box body, the other side of the refrigeration piece is attached to the upper end of the cooling seat, and the light guide crystal is fixed to the side edge of the cooling seat.

8. The optical fiber laser beam dodging and shaping device according to claim 7, wherein the box body is of a hollow structure, the box body is provided with a cooling water inlet, and the box body is used for dissipating heat of the refrigerating sheet.

9. The optical fiber laser beam dodging and shaping device as claimed in claim 8, wherein the refrigeration plate is a TEC refrigeration plate, and the cooling seat is metal copper plated with gold on the surface.

10. The fiber laser beam dodging and shaping device according to claim 9, wherein the right triangular prism is made of a sapphire crystal material; the light guide crystal is a high-transmittance crystal.