CN111106515B - Multi-wavelength laser and optical equipment - Google Patents
Multi-wavelength laser and optical equipment Download PDFInfo
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- CN111106515B CN111106515B CN201911409006.3A CN201911409006A CN111106515B CN 111106515 B CN111106515 B CN 111106515B CN 201911409006 A CN201911409006 A CN 201911409006A CN 111106515 B CN111106515 B CN 111106515B
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/08086—Multiple-wavelength emission
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- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/0616—Skin treatment other than tanning
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- A61N5/06—Radiation therapy using light
- A61N5/067—Radiation therapy using light using laser light
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
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Abstract
The invention discloses a multi-wavelength laser and optical equipment, and relates to the technical field of laser application.A laser generating unit emits a first wavelength light beam when a second dichroic mirror is positioned at a first position, the first wavelength light beam is converted into a second wavelength light beam after sequentially passing through the second dichroic mirror and a frequency doubling crystal, and the second wavelength light beam is output after sequentially passing through a third dual-wavelength reflecting mirror, the frequency doubling crystal, a second dichroic mirror, a fourth dichroic mirror and a coupling focusing mirror; when the second dichroic mirror is located at the second position, the laser generating unit emits a first wavelength light beam, and the first wavelength light beam sequentially passes through the sixth total reflection mirror, the fourth dichroic mirror and the coupling focusing mirror and then is output. The multi-wavelength laser provided by the invention not only can switch and output long pulse lasers with various wavelengths, but also has the advantages of wide application range, compact structure and smaller volume.
Description
Technical Field
The invention relates to the technical field of laser application, in particular to a multi-wavelength laser and optical equipment.
Background
Cutaneous vascular lesions are common in dermatology, such as port wine stains, strawberry-like angioma, mixed angioma, cutaneous telangiectasia, angioma, varicose veins and the like, and are difficult to treat, and the treatment of the cutaneous vascular lesions by laser is the best mode at present after years of clinical treatment.
Because different types of skin vascular lesions have different depths in skin tissues and have deeper depth of action as the wavelength is longer, in practical application, long pulse lasers with different wavelengths are correspondingly used for treatment according to the types of the lesions. The commonly used therapeutic lasers on the market at present are: 577nm pulse dye laser, 1064nm long pulse Nd, YAG laser, 532nm long pulse KTP frequency doubling Nd, YAG laser, 755nm or 808nm semiconductor laser.
Wherein, the 1064nm wavelength has the deepest penetration depth to the skin tissue, and the 532nm wavelength has the shallowest penetration depth, so that if one laser can output both 1064nm laser pulses and 532nm laser pulses, the clinical application range of the treatment to the skin vascular lesion tissue with different depths is greatly increased.
Because the laser is needed to destroy and coagulate the target tissue without damaging the peripheral tissue in the clinical treatment of the skin vascular lesion, the treatment adopts the output mode of long pulse laser, such as laser pulse with the pulse width of 10 ms-50 ms.
In the prior art, one long pulse laser can only output long pulse laser with a wavelength of 1064nm or 532nm singly, or two long pulse lasers with a single wavelength (1064 nm or 532 nm) are stacked side by side for use. The former mode is limited by single laser wavelength, and the clinical application range is narrow; the latter method has the disadvantages of large volume, high cost, high power consumption, high system control difficulty, high failure rate and inconvenient operation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multi-wavelength laser which can switch and output long pulse lasers with various wavelengths, has a wide application range, and is compact in structure and smaller in volume.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a multi-wavelength laser comprising:
a laser generating unit for emitting a first wavelength beam;
a second dichroic mirror M2 for reflecting the first wavelength light beam and transmitting a second wavelength light beam, and the second dichroic mirror M2 having a first position and a second position;
a wavelength conversion unit comprising a frequency doubling crystal C2, a third dual wavelength mirror M3, the frequency doubling crystal C2 for converting the first wavelength light beam into a second wavelength light beam, the third dual wavelength mirror M3 for reflecting the first wavelength light beam and the second wavelength light beam;
a first receiving unit including a sixth all-mirror M6;
a second receiving unit, which comprises a fourth dichroic mirror M4 and a coupling focusing mirror M7, wherein the fourth dichroic mirror M4 is used for reflecting the first wavelength light beam and transmitting the second wavelength light beam, and the coupling focusing mirror M7 is used for outputting the light beam;
when the second dichroic mirror M2 is located at the first position, the laser generation unit emits a first wavelength light beam, the first wavelength light beam passes through the second dichroic mirror M2 and the frequency doubling crystal C2 in sequence and is converted into a second wavelength light beam, and the second wavelength light beam passes through the third dual-wavelength reflecting mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2, the fourth dichroic mirror M4 and the coupling focusing mirror M7 in sequence and is output;
when the second dichroic mirror M2 is located at the second position, the laser generating unit emits a first wavelength light beam, and the first wavelength light beam sequentially passes through the sixth total reflection mirror M6, the fourth dichroic mirror M4, and the coupling focusing mirror M7 and is then output.
On the basis of the above technical solution, the multi-wavelength laser further includes a semiconductor indicating laser L for emitting a third wavelength light beam, which is disposed on a side of the third dual-wavelength reflector M3 away from the frequency doubling crystal C2, and the third wavelength is between the first wavelength and the second wavelength;
the third dual-wavelength mirror M3 and the fourth dichroic mirror M4 are also used for transmitting the third wavelength light beam;
when the semiconductor indication laser L emits a third wavelength light beam, the third wavelength light beam sequentially passes through a third dual-wavelength reflector M3, a frequency doubling crystal C2, a second dichroic mirror M2, a fourth dichroic mirror M4 and a coupling focusing mirror M7 and is output.
On the basis of the above technical solution, the multi-wavelength laser further includes a first reflective cavity mirror M1 for reflecting the first wavelength light beam emitted by the laser generating unit, and the first reflective cavity mirror M1 and the second dichroic mirror M2 are respectively located at two sides of the laser generating unit.
On the basis of the above technical solution, the first receiving unit further includes a gaussian output mirror M5 for partially reflecting the first wavelength light beam emitted by the laser generating unit, and the gaussian output mirror M5 is disposed between the sixth fully-reflecting mirror M6 and the laser generating unit.
On the basis of the above technical solution, the wavelength conversion unit further includes a Q-switched crystal Q1, which is disposed between the frequency doubling crystal C2 and the third dual-wavelength reflector M3.
On the basis of the above technical solution, a light path formed by the laser generating unit and the sixth total reflection mirror M6 and used for transmitting the first wavelength light beam is a first light path, a light path formed by the third dual-wavelength reflection mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2, and the fourth dichroic mirror M4 and used for transmitting the second wavelength light beam is a second light path, and an included angle between the first light path and the second light path is an acute angle.
The invention also provides optical equipment which is provided with the multi-wavelength laser.
On the basis of the above technical solution, the optical apparatus specifically includes:
the first mirror bracket is provided with a first reflector mirror M1;
a laser generating mechanism including the laser generating unit;
a switching mechanism including a driving mechanism for driving the second dichroic mirror M2 to switch between the first position and the second position, and the second dichroic mirror M2;
the wavelength conversion mechanism comprises a frequency doubling crystal frame, a Q crystal frame and a third mirror frame, wherein the frequency doubling crystal frame is provided with a frequency doubling crystal C2, the Q crystal frame is provided with a Q adjusting crystal Q1, and the third mirror frame is provided with a third dual-wavelength reflector M3;
the first receiving mechanism comprises a fifth mirror frame and a sixth mirror frame, the fifth mirror frame is provided with a Gaussian output mirror M5, and the sixth mirror frame is provided with a sixth total reflection mirror M6;
and the second receiving mechanism comprises a fourth lens frame and a seventh lens frame, wherein the fourth lens frame is provided with a fourth dichroic mirror M4, and the seventh lens frame is provided with a coupling focusing mirror M7.
On the basis of the above technical solution, the driving mechanism includes:
the two guide rails are fixedly arranged and arranged in parallel;
the trolley platform is slidably assembled on the two guide rails, and the second dichroic mirror M2 is installed on the trolley platform;
the two limiting pieces are respectively arranged at two ends of one of the guide rails, and the two limiting pieces are respectively used for limiting two positions where the trolley platform is located, so that the second dichroic mirror M2 is switched between a first position and a second position.
On the basis of the technical scheme, the laser generating mechanism further comprises a light-condensing cavity with a water-cooled structure, the laser generating unit comprises a laser crystal C1, a pulse xenon lamp X1 and a light-condensing reflecting surface F1, the light-condensing reflecting surface F1 is located in the light-condensing cavity, and the pulse xenon lamp X1 is a water-cooled straight-tube pulse xenon lamp.
Compared with the prior art, the invention has the advantages that: the multi-wavelength laser can switch and output long pulse lasers with various wavelengths, and is wide in application range; moreover, the two light beams with different wavelengths are output after passing through the fourth dichroic mirror M4 and the coupling focusing mirror M7, the output light path is coupled, the structure is compact, and the volume is smaller.
Drawings
FIG. 1 is a schematic diagram of the optical path structure of the multi-wavelength laser when the second dichroic mirror M2 is located at the first position I according to the embodiment of the present invention;
FIG. 2 is a schematic diagram of the optical path structure of the multi-wavelength laser when the second dichroic mirror M2 is located at the second position II according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an optical apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a driving mechanism in an embodiment of the invention.
In the figure: 1-a first lens frame, 2-a laser generating mechanism, 3-a moisture-proof box, 4-a switching mechanism, 5-a fourth lens frame, 6-a seventh lens frame, 7-a fiber coupling seat, 8-a sixth lens frame, 9-a fifth lens frame, 10-a frequency doubling crystal frame, 11-Q crystal frame, 12-a third lens frame, 13-an indicating light frame, 14-debugging hole screws, 15-a light machine base side plate, 16-a light machine base bottom plate, 17-a first travel switch, 18-a contact, 19-a second travel switch, 20-a guide rail and 21-a trolley platform.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a multiwavelength laser including a laser generating unit, a second dichroic mirror M2, a wavelength converting unit, a first receiving unit, and a second receiving unit.
The laser generating unit is used for emitting a first wavelength light beam; the second dichroic mirror M2 is for reflecting the first wavelength light beam and transmitting the second wavelength light beam, and the second dichroic mirror M2 has a first position and a second position.
The wavelength conversion unit comprises a frequency doubling crystal C2 and a third dual-wavelength reflector M3, wherein the frequency doubling crystal C2 is used for converting the first wavelength light beam into a second wavelength light beam, and the third dual-wavelength reflector M3 is used for reflecting the first wavelength light beam and the second wavelength light beam;
the first receiving unit includes a sixth fully-reflective mirror M6; the second receiving unit comprises a fourth dichroic mirror M4 and a coupling focusing mirror M7, the fourth dichroic mirror M4 is used for reflecting the first wavelength light beam and transmitting the second wavelength light beam, the coupling focusing mirror M7 is used for outputting a light beam, and in the embodiment of the present invention, the light beam output by the coupling focusing mirror M7 is denoted as LASER OUT as shown in fig. 1.
Referring to fig. 1, when the second dichroic mirror M2 is located at the first position I, the laser generating unit emits a first wavelength light beam, the first wavelength light beam passes through the second dichroic mirror M2 and the frequency doubling crystal C2 in sequence and is converted into a second wavelength light beam, and the second wavelength light beam passes through the third dual-wavelength reflecting mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2, the fourth dichroic mirror M4, and the coupling focusing mirror M7 in sequence and is output;
referring to fig. 2, when the second dichroic mirror M2 is located at the second position II, the laser light generating unit emits the first wavelength light beam, and the first wavelength light beam sequentially passes through the sixth total reflection mirror M6, the fourth dichroic mirror M4 and the coupling focusing mirror M7 and is then output.
In the embodiment of the invention, taking 1064nm as an example of the first wavelength light beam and 532nm as an example of the second wavelength light beam, the second dichroic mirror M2 is a 532nm output mirror, and is plated with a 0 ° 1064nm high reflection film and a 532nm antireflection film, the third dual wavelength mirror M3 is a full-reflection mirror, and is plated with 0 ° 1064nm and 532nm high reflection films on a concave surface with a curvature radius of 2M, and can transmit 650nm laser; the fourth dichroic mirror M4 is a transflective mirror, and is plated with a 45-degree 1064nm high-reflection film and 532nm and 650nm antireflection films; the sixth total reflection mirror M6 is a 45-degree total reflection mirror and is plated with a 45-degree 1064nm high reflection film; the coupling focusing mirror M7 is plated with antireflection films with three wavelengths of 1064nm, 532nm and 650nm, and the focal length is F20 mm.
In the embodiment of the invention, the optical path principle of 532nm laser is as follows:
when the second dichroic mirror M2 is located at the first position I, the laser generation unit emits 1064nm laser light, the 1064nm laser light sequentially passes through the second dichroic mirror M2 and the frequency doubling crystal C2 and is converted into 532nm laser light, and the 532nm laser light sequentially passes through the third dual-wavelength reflecting mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2, the fourth dichroic mirror M4 and the coupling focusing mirror M7 and is output as 532nm laser light.
In the embodiment of the invention, the optical path principle of the 1064nm laser is as follows:
when the second dichroic mirror M2 is located at the second position II, the laser generating unit emits 1064nm laser light, and the 1064nm laser light sequentially passes through the sixth total reflection mirror M6, the fourth dichroic mirror M4, and the coupling focusing mirror M7, and then outputs 1064nm laser light.
The multi-wavelength laser provided by the embodiment of the invention can switch and output long pulse lasers with various wavelengths, and is wide in application range; moreover, the two light beams with different wavelengths are output after passing through the fourth dichroic mirror M4 and the coupling focusing mirror M7, the output light path is coupled, the structure is compact, and the volume is smaller.
Furthermore, the multiwavelength laser of the embodiment of the invention further includes a semiconductor indicating laser L for emitting a third wavelength light beam, which is disposed on a side of the third dual-wavelength reflector M3 away from the frequency doubling crystal C2, and the third wavelength is between the first wavelength and the second wavelength;
the third dual-wavelength mirror M3 and the fourth dichroic mirror M4 are also used for transmitting the third wavelength light beam;
when the semiconductor indication laser L emits a third wavelength light beam, the third wavelength light beam sequentially passes through a third dual-wavelength reflector M3, a frequency doubling crystal C2, a second dichroic mirror M2, a fourth dichroic mirror M4 and a coupling focusing mirror M7 and is output.
In the embodiment of the present invention, taking 650nm laser as an example, the semiconductor indicating laser L emits 650nm red visible laser, and the optical path principle of 650nm laser is as follows:
the semiconductor indicating laser L emits 650nm laser, and the 650nm laser sequentially passes through the third dual-wavelength reflector M3, the frequency doubling crystal C2, the second dichroic mirror M2, the fourth dichroic mirror M4 and the coupling focusing mirror M7 and then is output as 650nm laser.
The multi-wavelength laser provided by the embodiment of the invention can realize the switching of three optical paths, when 1064nm or 532nm laser needs to be output, the laser generating unit emits 1064nm, and 1064nm or 532nm laser is output through the position switching of the second dichroic mirror M2; when 650nm laser light is required to be output, the semiconductor instruction laser light L emits 650nm laser light and is output.
The light path of 650nm laser and the light path of 532nm laser are partially overlapped, so that the utilization rate of optical components is high, and the structure is more compact; meanwhile, 650nm laser can be used for treating aiming target tissues and can also be used for debugging a laser device as reference light.
Furthermore, the multi-wavelength laser according to the embodiment of the present invention further includes a first reflective cavity mirror M1 for reflecting the first wavelength light beam emitted from the laser light generation unit, and the first reflective cavity mirror M1 and the second dichroic mirror M2 are respectively located at two sides of the laser light generation unit. The first reflecting cavity mirror M1 is a full-reflecting cavity mirror, and a 0-degree 1064nm and 532nm high-reflecting film is plated on a concave surface with the curvature radius of 5M.
When the second dichroic mirror M2 is located at the first position, the first wavelength light beam emitted by the laser light generation unit is reflected, oscillated and amplified among the first reflective cavity mirror M1, the second dichroic mirror M2 and the third dual-wavelength reflective mirror M3 until the first wavelength light beam is converted into the second wavelength light beam, and then is output through the second dichroic mirror M2.
Furthermore, the first receiving unit further comprises a gaussian output mirror M5 for partially reflecting the first wavelength beam emitted by the laser generating unit, and the gaussian output mirror M5 is disposed between the sixth total reflection mirror M6 and the laser generating unit. The Gaussian output mirror M5 is plated with a 1064nm reflecting film with variable reflectivity on a convex surface with the curvature radius of 2M;
the first reflection cavity mirror M1 and the Gaussian output mirror M5 are used for reflecting, oscillating and amplifying the first wavelength light beam emitted by the laser generation unit, and the first wavelength light beam is output through the Gaussian output mirror M5.
Furthermore, in the embodiment of the present invention, the wavelength conversion unit further includes a Q-switching crystal Q1, which is disposed between the frequency doubling crystal C2 and the third dual-wavelength mirror M3. The Q-switched crystal Q1 adopts Cr4+YAG crystal.
Furthermore, in the embodiment of the present invention, an optical path formed by the laser generating unit and the sixth total reflection mirror M6 and used for transmitting the first wavelength light beam is a first optical path, an optical path formed by the third dual-wavelength reflecting mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2, and the fourth dichroic mirror M4 and used for transmitting the second wavelength light beam is a second optical path, an included angle between the first optical path and the second optical path is an acute angle, and an included angle between the first optical path and the second optical path is an included angle α shown as 1.
Preferably, the acute angle α is 20 °, so that the first optical path and the second optical path form a Y-shaped structure, and the laser volume can be reduced.
The embodiment of the invention also provides optical equipment which is provided with the multi-wavelength laser.
Referring to fig. 3, in particular, the optical device in the embodiment of the present invention specifically includes:
a first mirror holder 1 to which a first mirror M1 is attached;
a laser generating mechanism 2 including the laser generating unit;
a switching mechanism 4 including a driving mechanism for driving the second dichroic mirror M2 to switch between the first position and the second position, and the second dichroic mirror M2;
the wavelength conversion mechanism comprises a frequency doubling crystal frame 10, a Q crystal frame 11 and a third mirror frame 12, wherein a frequency doubling crystal C2 is installed on the frequency doubling crystal frame 10, a Q adjusting crystal Q1 is installed on the Q crystal frame 11, and a third dual-wavelength reflector M3 is installed on the third mirror frame 12;
the first receiving mechanism comprises a fifth mirror bracket 9 and a sixth mirror bracket 8, wherein the fifth mirror bracket 9 is provided with a Gaussian output mirror M5, and the sixth mirror bracket 8 is provided with a sixth total reflection mirror M6;
and a second receiving mechanism including a fourth mirror frame 5 and a seventh mirror frame 6, wherein the fourth mirror frame 5 is mounted with a fourth dichroic mirror M4, and the seventh mirror frame 6 is mounted with a coupling focusing mirror M7.
Further, in the embodiment of the present invention, the optical apparatus further includes an indication frame 13, and the indication frame 13 includes a four-dimensional optical frame and a semiconductor indication laser L for emitting a third wavelength beam. The semiconductor indicating laser L adopts a point light source with 5mW of laser power and 650nm of wavelength and is fixed in the middle of the optical lens bracket; the optical frame is adjusted to enable the light path of the emitted 650nm indicating laser to coincide with the light path of 532nm working laser, and finally lasers with three wavelengths of 532nm, 1064nm and 650nm to coincide.
Furthermore, in the embodiment of the present invention, the optical apparatus further includes a base, on which all the optical devices are mounted, and the base is made of a groove-shaped aluminum structure with a bottom plate having a thickness of 20mm and a side plate having a height of 80 mm. The optical machine base comprises an optical machine base side plate 15 and an optical machine base floor 16, wherein the optical machine base side plate 15 is 80mm high, and the optical machine base floor 16 is 20mm thick.
In the embodiment of the present invention, the side plate 15 of the optical stand is further provided with a debugging hole screw 14, and the center of the screw hole of the debugging hole screw coincides with the center of the laser light path passing through the third dual-wavelength reflector M3, so as to be used during laser debugging.
Referring to fig. 4, further, in the embodiment of the present invention, the driving mechanism includes two rails 20 fixedly disposed, a cart platform 21 and two limiting members.
The two guide rails 20 are arranged in parallel; the trolley platform 21 is slidably assembled on the two guide rails 20, and the second dichroic mirror M2 is installed on the trolley platform 21;
the two limiting members are respectively disposed at two ends of one of the guide rails 20, and the two limiting members are respectively used for limiting two positions where the cart platform 21 is located, so that the second dichroic mirror M2 is switched between a first position and a second position.
Specifically, the limiting member is composed of a travel switch and a contact, and is respectively marked as a first limiting member and a second limiting member, the first limiting member includes a first travel switch 17 and a contact 18, the second limiting member includes a second travel switch 19 and another contact 18, and the first limiting member and the second limiting member are respectively disposed at two ends of one of the guide rails 20.
When the trolley platform 21 slides to the position of the first travel switch 17 and stops when encountering the contact 18, the second dichroic mirror M2 is located at the first position; when the carriage platform 21 slides to the second position of the travel switch 19, it stops when it encounters the contact 18, at which time the second dichroic mirror M2 is in the second position.
Furthermore, in the embodiment of the present invention, the laser generating mechanism 2 further includes a light condensing cavity with a water-cooled structure, the laser generating unit includes a laser crystal C1, a pulse xenon lamp X1 and a light condensing reflecting surface F1, the light condensing reflecting surface F1 is located in the light condensing cavity, and the pulse xenon lamp X1 is a water-cooled straight tube type pulse xenon lamp.
The light gathering reflecting surface F1 is made of white polytetrafluoroethylene material, so that the reflecting efficiency is high, and the water corrosion resistance is high; the specification of the pulse xenon lamp X1 is a water-cooling straight tube type pulse xenon lamp with the inner diameter phi of 5mm multiplied by the arc length of 100 mm; the specification of the laser crystal C1 is Nd with the outer diameter phi 7mm multiplied by the length 100mm3+YAG laser bar; the pulse xenon lamp X1 and the laser crystal C1 are arranged in parallel in the middle of the light-gathering cavity, and the pulse xenon lamp X1 is the light pumping source of the laser crystal C1.
Preferably, in order to improve the photoelectric conversion efficiency, the Nd ion doping concentration of the laser crystal C1 is adopted at a higher concentration of 1.1 at%.
Furthermore, in the embodiment of the present invention, the first frame 1, the third frame 12, the fourth frame 5, the fifth frame 9, the sixth frame 8, and the seventh frame 6 are each composed of a four-dimensional optical frame and an optical lens, and the optical lens is mounted in the middle of the four-dimensional optical frame, and the four-dimensional optical frame is used for adjusting a vertical included angle between the optical lens and an optical axis of an optical path and a central position of the optical lens.
Furthermore, in the embodiment of the present invention, the optical device further includes a moisture-proof box 3, and the moisture-proof box 3 is filled with a moisture-proof agent, so that when the optical device is closed, the interior of the optical device can be kept dry, the deliquescence of the KTP frequency doubling crystal can be prevented, and the service life of the optical device can be prolonged.
Furthermore, in the embodiment of the present invention, the optical apparatus further includes a fiber coupling seat 7, which uses a standard SMA905 coupling seat for connecting and fixing the optical fiber, and receiving the laser output from the coupling focusing mirror M7 in the seventh lens frame 6.
Specifically, in the embodiment of the present invention, the frequency doubling crystal holder 10 is composed of a four-dimensional optical lens holder and a frequency doubling crystal C2, where the frequency doubling crystal C2 is a KTP or BBO crystal, the frequency doubling crystal C2 is clamped on the four-dimensional optical lens holder, and the four-dimensional optical lens holder is an aluminum structure, and not only can be used to adjust an angle and a center between the frequency doubling crystal C2 and an optical path, but also can dissipate heat of the frequency doubling crystal C2.
Specifically, in the embodiment of the present invention, the Q crystal holder 11 is composed of a fixed support and a Q-switched crystal Q1, wherein the Q-switched crystal is made of Cr4+YAG crystal with transmittance T =40% -50% and mounted in the center of the fixed bracket; the fixed support is of an aluminum structure and is used for adjusting the centers of the frequency doubling crystal and the light path and radiating the Q crystal.
The optical equipment provided by the embodiment of the invention can realize long pulse laser with different wavelengths, and is convenient for doctors to select laser treatment with different wavelengths according to skin vascular lesion tissues with different depths in clinical treatment; and the structure is compact, the volume is small, and the cost is low.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (8)
1. A multi-wavelength laser, comprising:
a laser generating unit for emitting a first wavelength beam; the laser generating unit comprises a laser crystal C1, a pulse xenon lamp X1 and a light gathering reflection surface F1, and the pulse xenon lamp X1 is positioned on the side surface of the laser crystal C1;
a second dichroic mirror M2 for reflecting the first wavelength light beam and transmitting a second wavelength light beam, and the second dichroic mirror M2 having a first position and a second position;
a wavelength conversion unit comprising a frequency doubling crystal C2, a third dual wavelength mirror M3, the frequency doubling crystal C2 for converting the first wavelength light beam into a second wavelength light beam, the third dual wavelength mirror M3 for reflecting the first wavelength light beam and the second wavelength light beam;
a first receiving unit including a sixth all-mirror M6; a light path formed by the laser generating unit and the sixth full-reflecting mirror M6 and used for transmitting a first wavelength light beam is a first light path, a light path formed by the third dual-wavelength reflecting mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2 and the fourth dichroic mirror M4 and used for transmitting a second wavelength light beam is a second light path, an included angle between the first light path and the second light path is an acute angle, and the acute angle alpha is 20 degrees;
a second receiving unit, which comprises a fourth dichroic mirror M4 and a coupling focusing mirror M7, wherein the fourth dichroic mirror M4 is used for reflecting the first wavelength light beam and transmitting the second wavelength light beam, and the coupling focusing mirror M7 is used for outputting the light beam;
when the second dichroic mirror M2 is located at the first position, the laser generation unit emits a first wavelength light beam, the first wavelength light beam passes through the second dichroic mirror M2 and the frequency doubling crystal C2 in sequence and is converted into a second wavelength light beam, and the second wavelength light beam passes through the third dual-wavelength reflecting mirror M3, the frequency doubling crystal C2, the second dichroic mirror M2, the fourth dichroic mirror M4 and the coupling focusing mirror M7 in sequence and is output;
when the second dichroic mirror M2 is located at the second position, the laser generating unit emits a first wavelength light beam, and the first wavelength light beam sequentially passes through the sixth total reflection mirror M6, the fourth dichroic mirror M4 and the coupling focusing mirror M7 and is then output;
the semiconductor indicating laser L is used for emitting a third wavelength light beam, is arranged on one side of the third dual-wavelength reflector M3 far away from the frequency doubling crystal C2, and has a third wavelength between the first wavelength and the second wavelength;
the third dual-wavelength mirror M3 and the fourth dichroic mirror M4 are also used for transmitting the third wavelength light beam;
when the semiconductor indication laser L emits a third wavelength light beam, the third wavelength light beam sequentially passes through the third dual-wavelength reflector M3, the frequency doubling crystal C2, the second dichroic mirror M2, the fourth dichroic mirror M4 and the coupling focusing mirror M7 and is output, so that switching of three optical paths is achieved.
2. The multiwavelength laser of claim 1, further comprising a first reflective cavity mirror M1 for reflecting the first wavelength light beam emitted by the laser generating unit, the first reflective cavity mirror M1 and the second dichroic mirror M2 being respectively located on both sides of the laser generating unit.
3. The multiwavelength laser of claim 1, wherein the first receiving unit further comprises a gaussian output mirror M5 for partially reflecting the first wavelength beam emitted by the laser generating unit, the gaussian output mirror M5 being provided between the sixth totally reflecting mirror M6 and the laser generating unit.
4. The multiwavelength laser of claim 1, wherein the wavelength conversion unit further comprises a Q-tuning crystal Q1 disposed between the frequency doubling crystal C2 and a third two-wavelength mirror M3.
5. An optical device, characterized by: a multiwavelength laser as claimed in any of claims 1 to 4 is mounted.
6. An optical device as claimed in claim 5, characterized in that it comprises in particular:
a first mirror holder (1) on which a first mirror cavity M1 is mounted;
a laser generating mechanism (2) including the laser generating unit;
a switching mechanism (4) including a driving mechanism for driving the second dichroic mirror M2 to switch between the first position and the second position, and the second dichroic mirror M2;
the wavelength conversion mechanism comprises a frequency doubling crystal frame (10), a Q crystal frame (11) and a third mirror frame (12), wherein a frequency doubling crystal C2 is installed on the frequency doubling crystal frame (10), a Q adjusting crystal Q1 is installed on the Q crystal frame (11), and a third dual-wavelength reflector M3 is installed on the third mirror frame (12);
the first receiving mechanism comprises a fifth mirror frame (9) and a sixth mirror frame (8), wherein the fifth mirror frame (9) is provided with a Gaussian output mirror M5, and the sixth mirror frame (8) is provided with a sixth total reflection mirror M6;
and the second receiving mechanism comprises a fourth lens frame (5) and a seventh lens frame (6), wherein the fourth lens frame (5) is provided with a fourth dichroic mirror M4, and the seventh lens frame (6) is provided with a coupling focusing mirror M7.
7. The optical device of claim 6, wherein the drive mechanism comprises:
the device comprises two guide rails (20) which are fixedly arranged, wherein the two guide rails (20) are arranged in parallel;
the trolley platform (21) is arranged on the two guide rails (20) in a sliding mode, and the second dichroic mirror M2 is installed on the trolley platform (21);
and the two limiting pieces are respectively arranged at two ends of one guide rail (20), and are respectively used for limiting two positions of the trolley platform (21) so as to switch the second dichroic mirror M2 between a first position and a second position.
8. The optical device according to claim 6, wherein the laser generating mechanism (2) further comprises a water-cooled condensing cavity, the laser generating unit comprises a laser crystal C1, a pulse xenon lamp X1 and a condensing reflecting surface F1, the condensing reflecting surface F1 is located in the condensing cavity, and the pulse xenon lamp X1 is a water-cooled straight tube type pulse xenon lamp.
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