KR101641856B1 - Medical handpiece improved with beam quality using DOE lens - Google Patents

Abstract

The present invention relates to a medical handpiece for improving beam quality using diffractive optical element (DOE) lens. More specifically, the present invention relates to a medical handpiece for improving beam quality using DOE lens, which is designed to improve beam quality by using DOE lens. The shape of beam is in a square having various sizes so as to improve laser beam quality used for treating skin, thereby providing beam having the uniform shape of a square fitting into the size of lesions. The removal of overlapping portions prevents duplicated operations, and uneven energy distribution of beam quality becomes uniform by allowing beam with low quality to pass through the DOE lens at the very end. Thus, it is possible to overcome an issue associated with secondary treatment and side effects caused by the operation.

Description

{Medical handpiece improved beam quality using DOE lens}

The present invention relates to a medical handpiece for improving beam quality using a Dio lens, and more particularly, to a method for improving a beam quality by using a Dio lens and improving the quality of a laser beam for skin treatment by making a beam shape into various shapes in a rectangular shape In this way, it is possible to use a uniform rectangular beam in accordance with the lesion size. By eliminating the overlapped portion, it is possible to prevent the overlapped operation, and at the same time, the beam of bad quality is passed through the duo lens at the final stage, The present invention relates to a medical handpiece for beam quality improvement using a Dio lens capable of overcoming the problems of side effects and secondary medical care during a procedure by making the distribution uniform.

Conventional medical therapy laser equipment is used to treat a patient's condition by producing a beam quality that is provided through a resonator in the optics to produce an excellent beam quality.

In particular, in ND: YAG laser, which is a pigment therapy laser, when a beam quality of energy is not formed according to the beam quality of a laser irradiated to the skin, side effects (Side Effect).

A typical side effect is PIH (Postinflanmatory Hypcrppingmentation), which leads to a loss of treatment to the affected part again after a few months.

On the other hand, in the treatment range of 500-1,400 nm, which is the near infrared wavelength range of the medical laser apparatus, the shape of the beam formed to be used as the treatment laser by constituting the laser resonator is a circular beam size of 0.5 to 15 mm in diameter Have.

And is formed to have a centralized Gaussian beam (TEM00) or a uniform Fluence such as TopHat in the center.

However, after the resonator formation, the beam quality does not ideally appear due to the influence of the ideal alignment, the coating of the lens element, and the material.

In order to treat the patient, the beam quality is distorted or deformed due to various propagation reflected beams, and the beams do not form an ideal Beam or TopHat beam quality.

Therefore, energy is concentrated in the center center part, energy is not uniformly distributed inside the beam quality, and a side effect is generated in the treatment of the patient.

As shown in FIG. 1, the overlapping (overlapped) procedure is performed by examining the empty space formed between the circular beam and the rounded portion when the circular beam is irradiated to the ringed portion, thereby further performing the postinflanmatory hypocorpmentation It is called.

This leads to second-line treatment on the treatment site, which can be a cause of patient complaints.

In addition, conventionally, a beam having a fixed array of spots such as 9 x 9 or 10 x 10 at regular intervals through a DOE lens has been used to help the dye treatment, There was no way to create a square beam to effect treatment.

Therefore, in the present invention, it is possible to improve the beam quality through the medical handpiece using the Dio lens, and to prevent the overlapped operation by eliminating the overlapped portion when performing the surgery by forming the beam shape into a rectangular shape, We propose a medical handpiece for beam quality improvement by using Dio lens that can overcome the problems of side effects and secondary treatment during the procedure by uniformly distributing the uneven beam energy distribution through the Dio lens at the final stage through the bad beam. It is.

(Prior art) Korean Patent Publication No. 10-2012-0127564 (November 22, 2012)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art. Accordingly, it is a first object of the present invention to improve beam quality by using a Dio lens and to form a beam shape into a rectangular shape, So that the operation can be prevented.

It is a second object of the present invention to overcome the problems of side effects and secondary medical care during the procedure by uniformly distributing uneven beam energy through a diode lens at a final stage.

According to an aspect of the present invention, there is provided a medical handpiece for beam quality improvement using a Dio lens,

A barrel (100);

A focus lens unit 200 formed inside the lens barrel to provide a laser beam to a Dio lens unit formed on the lower side;

A diopter lens tip 300 coupled to the outer circumferential surface of the barrel so as to be vertically moved and adjusting a distance between the barrel and the barrel through vertical movement;

A diopter lens unit for forming a spot array pattern on the translucent plate and provided with a plurality of laser spots passing through the spot array pattern on the object to be treated, (400).

In addition,

A quartz substrate or sapphire is used, and a spot array pattern is formed on a transmission plate through an exposure and etching process using a photomask.

Through the medical handpiece for beam quality improvement using the Dio lens according to the present invention, the beam quality can be improved by using the Dio lens, the beam shape can be made into a rectangular shape, and the overlapped portion can be removed, It is possible to achieve an effect that can be prevented.

In addition, the beam having a poor beam quality is passed through the Dio lens at the final stage to uniformize the energy distribution of the uneven beam quality, thereby exerting the effect of overcoming the problems of the side effect and the secondary treatment at the time of the operation.

In addition, when a cue switch Endian laser is used as a pigment therapy laser, a laser is irradiated to a lesion having a pigment (black series) distributed in the dermis of Tattoo and Nevus of Ota The first symptom is the destruction of the color of the pigment and pigment system, which can be treated by manifesting various symptoms such as petechiae, purple color, epidermal damage, hemorrhage, blistering, etc. At this time, In case of excessive irradiation on the treatment area with beam quality, it is possible to leave another scar besides the pigment, or after removing the pigment in the dermis after treatment, There are many cases.

Therefore, it is possible to prevent the side effects of treatment by using a uniform beam quality in all dye treatments, and to prevent secondary treatment and to achieve optimized treatment.

In order to solve this problem, a uniform laser beam and a minimum overlap (a method of superimposing a beam at the time of laser treatment) are applied to a laser treatment device requiring a uniform beam quality, To treat the lesion.

1 is a diagram illustrating an example of skin damage to a circular spot of a conventional handpiece.
FIG. 2 is an overall configuration diagram of a medical handpiece for beam quality improvement using a Dio lens according to an embodiment of the present invention.
3 is a cross-sectional view of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention.
FIG. 4 is a view illustrating a circular beam and a square beam when adjusting the distance of a medical hand piece for beam quality improvement using a Dio lens according to an embodiment of the present invention.
5 is a view showing a plurality of laser spots passing through a spot array pattern of a medical handpiece for beam quality improvement using a Dio lens according to an embodiment of the present invention.
6 is a perspective view of a diopter lens unit of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating an example of skin damage to a rectangular spot provided through a Dio lens portion of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention. FIG. In the same manner as in the first embodiment.
9 is a cross-sectional view of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention.
10 is an exemplary view comparing a conventional laser spot with a laser spot according to the present invention.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art will be able to devise various apparatuses which, although not explicitly described or illustrated herein, embody the principles of the invention and are included in the concept and scope of the invention.

Furthermore, all of the conditional terms and embodiments listed herein are, in principle, only intended for the purpose of enabling understanding of the concepts of the present invention, and are not to be construed as limited to such specifically recited embodiments and conditions do.

Means for solving the problems of the present invention are as follows.

That is, in the medical handpiece for beam quality improvement using the Dio lens of the present invention,

A barrel (100);

A focus lens unit 200 formed inside the lens barrel to provide a laser beam to a Dio lens unit formed on the lower side;

A diopter lens tip 300 coupled to the outer circumferential surface of the barrel so as to be vertically moved and adjusting a distance between the barrel and the barrel through vertical movement;

A diopter lens unit for forming a spot array pattern on the translucent plate and provided with a plurality of laser spots passing through the spot array pattern on the object to be treated, (400). ≪ / RTI >

The diopter lens unit,

A quartz substrate or sapphire is used, and a spot array pattern is formed on the light transmitting plate through an exposure and etching process using a photomask.

In this case, when the distance between the focus lens unit 200 and the dioptric lens unit 400 is adjusted to 10 mm to 30 mm,

The plurality of laser spot shapes are characterized by being circular,

When the distance between the focus lens unit 200 and the diopter lens unit 400 is adjusted to 31 mm to 80 mm,

The plurality of laser spots are rectangular in shape, and the rectangular size is adjusted to a desired size of 2 x 2 mm, 3 x 3 mm, 4 x 4 mm, 5 x 5 mm, 6 x 6 mm, or 7 x 7 mm And can be used.

At this time, the plurality of laser spots,

 7 x 7 laser spots or a plurality of 11 x 11 laser spot geometries,

The entire shape of the laser spot is formed into a rectangular shape by adjusting the distance between the focus lens unit and the diopilot lens unit and applied to the laser beam quality used for skin treatment, .

At this time, the wavelength of the laser light is 550 to 1,400 nm,

The diopter lens unit 400 includes:

The laser light having a wavelength of 550 to 1,400 nm is AR coated to attenuate the transmission loss.

Hereinafter, a medical handpiece for beam quality improvement using a Dio lens according to the present invention will be described in detail with reference to embodiments.

FIG. 2 is an overall configuration diagram of a medical handpiece for beam quality improvement using a Dio lens according to an embodiment of the present invention.

3 is a cross-sectional view of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention.

2 to 3, a medical handpiece for beam quality enhancement using a Dio lens according to the present invention includes a barrel 100, a focus lens unit 200, a diopter lens tip 300, a diopter lens unit 400, .

FIG. 4 is a view illustrating a circular beam and a square beam when adjusting the distance of a medical hand piece for beam quality improvement using a Dio lens according to an embodiment of the present invention.

As shown in FIG. 4, the diopter lens tip is coupled to the outer circumferential surface of the lens barrel 100 so that the diopter lens tip is moved up and down. For example, Or counterclockwise, the Diode lens tip moves upward or downward relative to the lens barrel to adjust the distance from the lens barrel.

The focus lens unit 200 is formed inside the barrel, and fixing means for fixing the focus lens unit can be formed along the inner circumferential surface.

The size of the beam shape formed at the end of the diode lens tip 300 is determined according to the movement of the focus lens unit 200 of the laser beam of the present invention.

That is, as the distance of the focus is changed, the distance of the plurality of laser spots is widened to widen the arrangement of the spots, or the distance of the plurality of laser spots is narrowed and the distance of the spots is narrowed. A certain amount of energy must be concentrated on the substrate 300 to form a square beam.

The shape of the rectangular beam can not be formed by adjusting the spacing of the plurality of laser spots without using the focus lens unit 200 and the diode lens tip 300.

Accordingly, the present invention provides a configuration for adjusting the distance of the Dio lens tip 300 so that a proper distance is changed in the focus lens unit 200 and is transmitted to the Dio lens unit 400 to form a square beam.

At this time, the focus lens unit forms a hemispherical convex lens in an inverted manner, and provides the introduced laser light to the Dio lens unit formed on the lower side.

Here, it is preferable that the laser beam is used as a medical laser light source to provide a power suitable for a single laser by coating a predetermined wavelength band for skin treatment, and Er: YAG laser, Nd: YAG laser and the like can be used.

The dioptric lens tip 300 is coupled to the outer circumferential surface of the lens barrel so as to move up and down. Preferably, the lens barrel 300 is vertically moved along the outer circumferential surface of the lens barrel.

Therefore, the distance between the lens barrel and the barrel is controlled through the up and down movement.

6 is a perspective view of a diopter lens unit of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention.

As shown in FIG. 6, the Dio lens section 400 is formed inside the Dio lens tip, and the spot array pattern 420 is formed on the transparent plate 410.

The focus lens unit 200 and the diopter lens tip 300 are provided on the outer circumference of the treatment object 10, and the laser beam passes through the spot array pattern. A square beam can be generated by controlling the distance between the two beams, thereby making it possible to output without overlapping portions different from the circular beam.

At this time, in the dioptric lens unit of the present invention,

A quartz substrate or sapphire is used, and a spot array pattern is formed on a light transmitting plate through an exposure and etching process using a photomask.

Assuming that the two-dimensional spots shown in FIG. 5 are a single subject, and computing a Fourier transform function for the subject, a complex two-dimensional pattern appears.

The dioptric lens is a lens that causes a spatial amplitude variation of a previously calculated pattern to be formed in a spatial phase difference shape on a thin plate through which a laser beam can be transmitted by using an exposure and etching process using a photomask.

Accordingly, a feature of the present invention is that the diode array is formed using a quartz substrate or sapphire, and a spot array pattern is formed on a light transmitting plate through an exposure and etching process using a photomask.

That is, if the quartz substrate or the sapphire material is used, the loss ratio of the conventional lens can be reduced to 50% of the loss ratio to 10%.

Accordingly, the diode lens unit of the present invention should be constructed using a quartz wafer or sapphire.

Because the material determines the wavelength, a quartz substrate or sapphire should be used to use the wavelength of 500-1,400 nm, which is the most desirable wavelength.

When the distance between the focus lens unit 200 and the dioptric lens unit 400 of the present invention is adjusted to 10 mm to 30 mm, a plurality of spot-shaped array intervals are changed to make a density capable of forming a rectangular beam .

However, since a beam shape to be treated with a skin lesion such as a Nd: YAG laser such as a skin treatment laser is much better in beam quality than a circular shape, and the energy distribution of the square beam is uniform as shown in FIG. 7, It is possible to provide a uniform beam quality even if the beam quality is poor.

This is because the beam passing through the diode lens unit 400 has a uniform energy distribution by providing a plurality of laser spots to the treatment target at predetermined intervals.

When the distance between the focus lens unit 200 and the dioptric lens unit 400 is adjusted to 31 mm to 80 mm,

A variation in array spacing of a plurality of spot shapes can occur to create a density capable of forming a square beam.

That is, the distance between the focus lens unit 200 and the diopter lens unit 400 is appropriately adjusted so as to be transformed into a high-density rectangular beam. The rectangular size is 2 x 2 mm, 3 x 3 mm, 4 x 4 mm mm, 5 x 5 mm, 6 x 6 mm, and 7 x 7 mm.

At this time, when the distance is out of the range, a square size can not be formed and uniform beam quality can not be obtained.

That is, if a square-shaped beam is formed by rotating the handpiece to adjust the distance between the diode lens unit and the focus lens unit, a uniform beam quality can be provided even with poor incoming beam quality.

In summary, a mechanism for adjusting the distance between the focus lens unit, the diopter lens unit and the treatment target of the diopter lens tip can be constructed to produce a rectangular beam as shown in FIG. 8, You can also change the size.

At this time, the energy distribution of the outgoing square beam is uniform (from poor beam quality).

At this time, it is preferable to provide the beam of the most preferable rectangular size when the distance is maintained.

8 is a view illustrating a process of deforming the focus lens unit, the dioptric lens unit, and the dioptric lens tip by appropriately adjusting the distance between the focus lens unit and the dioptric lens tip, and deforming the beam into a beam having a high density. Item, and item ④, the distance will be changed from circle to rectangle according to the distance, and the size and size will be determined according to the adjustment distance.

Particularly, in the plurality of laser spots,

 A 7 x 7 laser spot, or a 11 x 11 laser spot array.

That is, a laser spot based on a plurality of rectangular arrays such as a 7 x 7 laser spot or an 11 x 11 laser spot is provided, and the distance between the focus lens unit 200 and the diopter lens unit 400 is appropriately adjusted, Can be transformed into a square beam with a high square to produce square beams of various sizes.

As a result, the beam quality of the treatment target can be adjusted to the same energy as the size, preferably by forming a square beam, which can be solved, and the therapeutic effect is remarkably increased.

That is, the entire shape of the laser spot can be formed into a rectangular shape by adjusting the distance between the focus lens portion and the diopilot lens portion, thereby eliminating the overlapped portion, thereby preventing the overlapped operation.

Meanwhile, the wavelength of the laser light is preferably 550 to 1,400 nm, and the Dyo lens portion 400 may be coated with AR (Anti Reflection Coating) laser light having a wavelength of 550 to 1,400 nm to attenuate transmission loss .

For example, by AR coating a laser light wavelength of 550 to 1,400 nm, transmission loss of about 10% to 15% can be attenuated.

9 is a cross-sectional view of a medical handpiece for beam quality enhancement using a Dio lens according to an embodiment of the present invention.

On the other hand, as shown in Fig. 9, in the medical handpiece for beam quality improvement using the Dio lens according to the embodiment of the present invention,

A medical handpiece for beam quality enhancement,

A barrel (100);

A focus lens unit 200 formed inside the lens barrel to provide a laser beam to a Dio lens unit formed on the lower side;

A diopter lens tip (300) coupled to the inner circumferential surface of the barrel so as to be vertically moved and adjusting a distance between the barrel and the barrel through up and down movement;

A spot array pattern is formed on the translucent plate, and laser light having passed through the focus lens unit is formed on the treatment object by a spot array pattern And a diode lens unit 400 for providing a plurality of passed laser spots,

When the focus lens unit is vertically moved, the distance between the focus lens unit 200 and the diopter lens unit 400 can be adjusted up to 10 to 30 mm so as to provide a plurality of circular laser spot shapes In addition,

The distance between the focus lens unit 200 and the diopter lens unit 400 is adjusted up and down to 5 to 50 mm by vertically moving the Dio lens tip,

It is transformed into a dense square beam, but the rectangle size can be any size of 2 x 2 mm, 3 x 3 mm, 4 x 4 mm, 5 x 5 mm, 6 x 6 mm, 7 x 7 mm, 8 x 8 mm Can be used.

9, the focus lens unit 200 is formed inside the lens barrel to provide the laser light to the diol lens unit formed on the lower side, and is configured to be movable up and down.

For example, if the connecting member 70 is configured to move up and down at the end of the focus lens unit and the slide groove is formed along the outer circumferential surface of the lens barrel, the focus lens unit can be moved up and down from the outside.

At this time, the constituent means for moving the focus lens unit up and down may be sufficiently derived by those skilled in the art in addition to the above-described examples.

Meanwhile, the dioptric lens unit 400 is formed at the end of the dioptric lens tip. If the screw coupling is provided as in the embodiment, the dioptric lens tip may be vertically varied.

Accordingly, when the dioptric lens tip is moved up and down, the dioptric lens section formed at the end of the dioptric lens tip is moved up and down. At this time, the distance between the focus lens section 200 and the dioptric lens section 400 is adjusted to 5 to 50 mm So as to provide a plurality of rectangular laser spot shapes.

Meanwhile, '19' shown in FIG. 9 means a preferable distance between the end portion of the diode lens tip and the diopter lens portion.

Then, a safety glass is formed at the end of the diode lens tip.

In this case, the entire shape of the laser spot is formed into a rectangular shape by adjusting the distance between the focus lens unit and the diopter lens unit and the distance between the focus lens unit and the diopter lens tip 300, Can be prevented.

In addition, as shown in FIG. 10, in the case of the conventional system, a spot in a circular state having a plurality of fixed arrays is provided. However, in the case of the present invention, Thereby providing an advantage of providing a beam.

However, in the case of the present invention, the distance between the diopter lens and the focus lens is adjusted to change the shape of the beam to a quadrangle, and the energy distribution And the size of the beam output from the square is also changed to be utilized for the treatment. Thus, it is possible to prevent the side effects and the secondary treatment at the time of the conventional treatment, thereby providing an excellent effect to the skin treatment.

Through the above-described structure and operation, the beam quality is improved by using the Dio lens, and the beam shape is formed into a rectangular shape, thereby eliminating the overlapped portion, thereby achieving the effect of preventing the overlapped operation.

In addition, a beam of poor quality is passed through the diopter lens at the final stage to uniformize the energy distribution of the uneven beam quality, and the distance between the focus lens section, the dioprene lens section, and the diopter lens tip is appropriately adjusted, It is possible to overcome the problems of side effects and secondary medical care during the operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: lens barrel
200:
300: Dio Lens Tips
400: diode lens part

Claims (6)

A medical handpiece for beam quality enhancement,
A barrel (100);
A focus lens unit 200 formed inside the lens barrel to provide a laser beam to a Dio lens unit formed on the lower side;
A diopter lens tip 300 coupled to the outer circumferential surface of the barrel so as to be vertically moved and adjusting a distance between the barrel and the barrel through vertical movement;
A diopter lens unit for forming a spot array pattern on the translucent plate and provided with a plurality of laser spots passing through the spot array pattern on the object to be treated, (400)
Wherein the arrangement of the plurality of laser spots includes:
7 x 7 laser spot or 11 x 11 laser spot shape array, wherein the entire shape of the laser spot is formed into a rectangular shape by adjusting the distance between the focus lens part and the diopil lens part, The overlapping treatment can be prevented by removing the portion where the overlapping is performed.
A medical handpiece for beam quality enhancement,
A barrel (100);
A focus lens unit 200 formed inside the lens barrel to provide a laser beam to a Dio lens unit formed on the lower side;
A diopter lens tip 300 coupled to the outer circumferential surface of the barrel so as to be vertically moved and adjusting a distance between the barrel and the barrel through vertical movement;
A diopter lens unit for forming a spot array pattern on the translucent plate and provided with a plurality of laser spots passing through the spot array pattern on the object to be treated, (400)
The diode lens unit is formed using a quartz substrate or sapphire, and is characterized in that a spot array pattern is formed on a transmission plate through an exposure and etching process using a photomask,
Wherein the arrangement of the plurality of laser spots includes:
7 x 7 laser spot or 11 x 11 laser spot shape array, wherein the entire shape of the laser spot is formed into a rectangular shape by adjusting the distance between the focus lens part and the diopil lens part, The overlapping treatment can be prevented by removing the portion where the overlapping is performed.
A medical handpiece for beam quality enhancement,
A barrel (100);
A focus lens unit 200 formed inside the lens barrel to provide a laser beam to a Dio lens unit formed on the lower side;
A diopter lens tip (300) coupled to the inner circumferential surface of the barrel so as to be vertically moved and adjusting a distance between the barrel and the barrel through up and down movement;
A spot array pattern is formed on the translucent plate, and laser light having passed through the focus lens unit is formed on the treatment object by a spot array pattern And a diode lens unit 400 for providing a plurality of passed laser spots,
When the focus lens unit is vertically moved, the distance between the focus lens unit 200 and the diopter lens unit 400 can be adjusted up to 10 to 30 mm so as to provide a plurality of circular laser spot shapes In addition,
The distance between the focus lens unit 200 and the diopter lens unit 400 is adjusted up and down to 5 to 50 mm by vertically moving the Dio lens tip,
And a plurality of laser spot shapes of a quadrangular shape are provided, wherein the rectangular size is 2 x 2 mm, 3 x 3 mm, 4 x 4 mm, 5 x 5 mm, 6 x 6 mm, 7 x 7 mm, 8 x 8 mm. The medical handpiece for improving beam quality using the Dio lens according to claim 1,
3. The method according to claim 1 or 2,
When the distance between the focus lens unit 200 and the diopter lens unit 400 is adjusted to 10 mm to 30 mm,
The plurality of laser spot shapes are characterized by being circular,
When the distance between the focus lens unit 200 and the diopter lens unit 400 is adjusted to 31 mm to 80 mm,
Wherein the plurality of laser spot shapes are rectangular, wherein the rectangular size is 2 x 2 mm, 3 x 3 mm, 4 x 4 mm, 5 x 5 mm, 6 x 6 mm, 7 x 7 mm, 8 x 8 mm And the size of the image of the medical hand piece used for improving beam quality using the Dio lens.
The method of claim 3,
Wherein the arrangement of the plurality of laser spots includes:
A 7 x 7 laser spot or an 11 x 11 laser spot geometry arrangement,
Wherein the entire shape of the laser spot is formed into a rectangular shape by adjusting the distance between the focus lens unit and the diopilot lens unit, thereby removing overlapped portions differently from the circular beam during treatment, thereby preventing overlap processing. Medical handpiece for beam quality improvement.
4. The method according to any one of claims 1 to 3,
The wavelength of the laser light is 550 to 1,400 nm,
The diopter lens unit 400 includes:
And the transmission loss is attenuated by AR coating of the laser light wavelength of 550 to 1,400 nm.

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