CN204637343U - A kind of medical laser array focus mirror - Google Patents

Abstract

The utility model relates to a medical laser array focusing mirror, which includes a multi-beam splitter and a focusing lens. The distance between the multi-beam splitter and the focusing lens is defined by an isolation ring. Dammann) is a binary optical element made of the principle of periodic phase grating. The multi-beam splitter divides the laser into multiple fractional laser beams with uniform energy distribution, and the focusing lens focuses the laser beams into parallel fractional laser beams. The utility model has the advantages of simple and compact structure, high diffraction efficiency, and homogenized laser beams. It is applied in the medical beauty industry. The medical laser array focusing mirror is used in conjunction with medical laser treatment instruments to treat human skin with laser light, which can be flexible and effective. Controlling the area of action between the laser and the affected skin greatly improves the safety of treatment.

Description

A medical laser array focusing mirror

technical field

The utility model relates to a medical laser array focusing mirror.

Background technique

With the development of laser technology, a new applied discipline - laser medicine has gradually formed. The unique advantages of laser have solved many problems that traditional medicine cannot solve in basic research and clinical application, which has attracted the attention of medical circles at home and abroad. .

At present, the conventional Q-switch (such as electro-optical Q-switching) laser therapy head generally uses ordinary focusing lens to focus the laser beam directly, forming a conical distribution of laser beam in space, which will show that the laser energy is too weak, There are three kinds of effects: too strong and ineffective. If the laser energy is too strong, the skin will be damaged; but if the energy is too weak and ineffective, it will not achieve the therapeutic effect, and the ordinary focusing lens will form a defocused spot, which will make the penetration shallow and the subcutaneous energy distribution will be uneven. Uniform; there are often disadvantages such as large damage area, insignificant therapeutic effect, long healing time, and relatively low safety. Medical fractional laser can produce multiple fractional laser beams with uniform energy distribution, which has the advantages of deep penetration, remarkable therapeutic effect, less side effects and short healing time.

However, medical fractional lasers with high repetition rate (generally quasi-continuous or continuous output) usually use a scanning galvanometer to scan and focus the laser beam instead of directly splitting the laser beam, and the cost is relatively high. And because the vibration frequency of the scanning galvanometer is relatively high, for a low repetition rate, a short pulse width medical laser therapy instrument (such as an electro-optic Q-switched laser) is not suitable.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned laser focusing mirror and scanning vibrating mirror, and provide a medical laser array focusing mirror.

The technical solution adopted by the utility model is: a medical laser array focusing mirror, including a multi-beam splitter and a focusing lens, the multi-beam splitter and focusing lens are coaxially arranged along the laser transmission direction, and the The multi-beam splitter and the focusing lens are provided with an isolation ring that limits the distance between the two, and the multi-beam splitter is a two-dimensional binary system made based on the principle of Dammann periodic phase grating. Optical element.

The medical laser array focusing mirror of the utility model has the advantages of simple and compact structure, small diffraction angle and high diffraction efficiency. It is installed in the laser treatment head and used in conjunction with the medical laser treatment instrument. Uniform fractional laser beams, the focusing lens focuses the laser beams into parallel fractional laser beams, which can form parallel fractional laser beams with uniform energy distribution. The therapeutic effect is remarkable, side effects are small, and safety performance is high. Continuous and pulsed laser therapy devices.

The preferred technical solution of the utility model includes: a multi-beam splitter, which is a binary optical element with 4 stepped structures etched on an optical glass substrate. The step height is 0-15 μm.

The multi-beam splitter is a multi-beam splitter that can split the laser beam into square, rectangular, circular or elliptical lattice laser beams.

The focusing lens is a double-convex focusing lens, or a plano-convex focusing lens, and the focusing lens is highly transparent near the laser wavelength. The focusing lens 3 is a biconvex lens of Ф20×3mm, focal length f=50mm, both sides of the lens are coated with laser anti-reflection coating. The focusing lens is highly transparent near the laser wavelength.

The utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural schematic diagram of the optical system of the present invention.

Fig. 2 is a schematic diagram of a cross-sectional shape of a multi-beam splitter.

Fig. 3 is a schematic diagram of an embodiment of the utility model applied in skin treatment.

The labels in the drawings are: 1-multi-beam splitter, 2-isolating ring, 3-focusing lens, 4-spot, 5-skin.

Detailed ways

Embodiment 1, as shown in FIG. 1 , this embodiment is a medical laser array focusing lens, also known as a medical laser dot array focusing lens, which is suitable for continuous, quasi-continuous and pulsed laser therapy instruments. The focusing mirror consists of two main parts: a multi-beam splitter 1 and a focusing lens 3. The multi-beam splitter 1 is upstream of the focusing lens 3. Upstream, the multi-beam splitter 1 splits the laser light into multiple beams for energy distribution Uniform fractional laser beams, the downstream focusing lens 3 focuses the laser beams into parallel fractional laser beams, which can form parallel fractional laser beams with uniform energy distribution.

In the multi-beam splitter 1 and the focusing lens 3, there is also an isolation ring 2 made of plastic, and the isolation ring 2 can be used to limit the distance between the multi-beam splitter 1 and the focusing lens 3, and also to limit the multi-beam The relative position between the beam splitter 1 and the focusing lens 3 is to ensure that the multi-beam splitter 1 and the focusing lens 3 are arranged coaxially.

In this embodiment, the multi-beam splitter 1 is a two-dimensional binary optical element made based on the principle of a Dammann periodic phase grating. The Dammann grating is a binary phase grating with a special aperture function. The Fraunhofer diffraction pattern generated by the incident light wave is a certain number of dots with equal intensity spots, which completely avoids the general amplitude grating caused by the intensity envelope of the sinc function. The light intensity of each spectral line point is unevenly distributed.

At present, there are usually two methods to obtain a Dammann-type two-dimensional phase grating. One method is to expand the one-dimensional binary phase grating into a two-dimensional phase grating in the x and y directions, and the phase angles of each level are on the x and y axes. Extended in one dimension, but this method is less efficient in diffraction. Another method is to directly search for the optimal phase transformation point on the two-dimensional plane to obtain a better binary phase grating, so that a periodic unit forms a grid-type aperture, and the phase distribution of the unit is determined by each circular aperture ( The shape of the aperture can be selected, and in this design it is circular) The phase distribution of the units is jointly determined, and each circular aperture unit takes a value of 0 or 1, which means that the corresponding phase is 0 or π; this method can significantly improve the diffraction efficiency . In this embodiment, the multi-beam splitter 1 is designed and manufactured according to the second method, and the design and manufacturing steps are: theoretical optimization calculation, masking, gluing, photolithography, and etching.

In this embodiment, the multi-beam splitter 1 is a structure with four steps etched on an optical glass substrate, as shown in FIG. 2 , wherein the height of the steps is 0-15 μm.

The multi-beam splitter 1 can split the laser beam into a square 4 and a fractional laser beam in the shape of a rectangle, a circle, an ellipse, etc.

In this embodiment, the focusing lens 3 is a double-convex focusing lens, which is highly transparent near the wavelength of the laser and converges the laser beam. The isolation ring 2 is made of plastic, which can not only reduce the cost, but also effectively protect the optical devices.

The working principle of the utility model: first install the multi-beam beam splitter 1, the isolation ring 2, and the focusing lens 3 in sequence according to the order shown in Fig. 1 . The focusing lens 3 adopts a focusing lens with high transparency near the laser wavelength. The medical laser array (dot matrix) focusing mirror is installed in the laser treatment head. This embodiment elaborates on the medical Q-switch ruby laser treatment instrument. The Dammann type grating of ×2mm has a diffraction angle of 0.57°, and the diffraction efficiency can reach 80.5%, which can make the laser beam form a binary optical component with a circular spot 4 and a 15×15 dot matrix, as shown in Figure 3. Focusing lens 3 is a biconvex lens with Ф20×3mm and focal length f=50mm. Both sides of the lens are coated with 694nm laser anti-reflection coating. After turning on the Q-switch ruby laser therapeutic instrument, the laser beam will be divided into 225 The beams with equal beam intensity and uniform energy distribution form a square lattice laser beam, which converges into a parallel laser beam after passing through the focusing lens 3, and acts on the skin 5 of the patient's affected area.

The thickness of the laser anti-reflection film is 0.25 times of the working wavelength of the laser, and the thickness of the anti-reflection film is different for different working wavelengths. In this embodiment, the 694nm laser anti-reflection film is used as the laser working wavelength. The thickness of the transparent film is 0.25 times of the working wavelength of the laser.

What the above embodiment described is a kind of preferred implementation mode of the present utility model, it should be pointed out that, for those of ordinary skill in the technical field to which the utility model belongs, on the premise of not departing from the principle of the utility model, some Improvement and retouching, so that the utility model can also be applied to Q-switched medical laser therapeutic instrument, non-Q-switched medical laser therapeutic instrument, the working mode can be continuous, quasi-continuous and pulse mode, such as Q-switched YAG laser therapeutic instrument, _CO2 laser Treatment instrument, optical fiber laser treatment instrument, etc., these improvements and modifications can also be regarded as the protection scope of the present utility model.

Claims (8)

1. A medical laser array focusing mirror, comprising a multi-beam splitter and a focusing lens, and the multi-beam splitter and the focusing lens are coaxially arranged along the laser transmission direction, between the multi-beam splitter and the focusing lens An isolation ring is arranged between the focusing lenses to limit the distance between them, and the feature is that the multi-beam splitter is a two-dimensional binary optical element based on the principle of Dammann periodic phase grating. 2 . The medical laser array focusing lens according to claim 1 , wherein the multi-beam splitter is a binary optical element with four stepped structures etched on an optical glass substrate. 3. The medical laser array focusing lens according to claim 2, characterized in that: the height of the steps is 0-15 μm. 4. The medical laser array focusing mirror according to claim 1, characterized in that: the multi-beam splitter is capable of dividing the laser beam into square, rectangular, circular or elliptical fractional laser beams Multiple beam splitters. 5. The medical laser array focusing lens according to any one of claims 1 to 4, wherein the focusing lens is a biconvex focusing lens, or a plano-convex focusing lens. 6. The medical laser array focusing lens according to claim 5, characterized in that: the focusing lens is a biconvex lens with a diameter of Ф20×3mm and a focal length of f=50mm, and both sides of the lens are coated with laser anti-reflection coatings. 7. The medical laser array focusing mirror according to claim 5, characterized in that: the thickness of the laser anti-reflection coating is 0.25 times of the working wavelength of the laser. 8. The medical laser array focusing lens according to any one of claims 1 to 4, characterized in that: said focusing lens is highly transparent near the laser wavelength.