KR102109079B1 - High-power laser diode module using parabolic mirror - Google Patents

Abstract

The present invention discloses a laser diode module. In one embodiment of the present invention, in a laser diode module, a plurality of laser beams oscillated from the laser providing unit using a laser providing unit providing a plurality of laser beams and a plurality of different parabolic mirrors sharing a focus It provides a laser diode module including a laser focusing unit for focusing. According to the present invention, by using two parabolic mirrors that share the focus, it is possible to reduce the size of an optical fiber in which a plurality of beams are finally condensed, to miniaturize the size of a laser diode module package, and to develop a spatial beam combining technique. By using, it is possible to avoid output loss due to Polarization Extinction Ratio (PER) caused by polarization beam combining technology.

Description

High power laser diode module using parabolic mirror {HIGH-POWER LASER DIODE MODULE USING PARABOLIC MIRROR}

The present invention relates to a laser diode module to which a spatial beam combining technique is applied, and more specifically, a beam emitted from a plurality of laser diodes is focused on a single optical fiber by using two parabolic mirrors that share focus. It relates to a high-power laser diode module using a parabolic mirror.

In general, laser (Light Amplification by Stimulated Emission of Radiation, LASER) refers to light amplified by a resonator that emits light from a medium by an external stimulus.

These lasers are composed of an amplification medium, a resonator, and a pumping source (Pump Source), and are classified into gas lasers, solid-state lasers, semiconductor lasers, and fiber lasers according to the type of the medium.

In particular, lasers are easy to use, clean and provide rapid processing results, so they have been applied to various industries, and new industrial lasers have been steadily developed due to the increasing demand for high power lasers.

Among them, the optical fiber laser has an unprecedented high light-to-light conversion efficiency among solid-state lasers, has a good beam quality, and can form a resonator in the optical fiber itself, so it does not have a resonator separated from the medium like a normal laser. Therefore, it is in the spotlight as an industrial light source because it does not require maintenance.

The fiber laser described above is used in medical fields such as treatment, diagnosis, and other types of medical laser pumping, and is used alone in industrial fields such as marking, cutting, and soldering, and has recently been spotlighted as an industrial laser. It is also used as a fiber laser pumping light source.

In order to realize a high-power laser system that improves the performance of such a fiber laser, in order to increase the light output of a laser diode (LD) module, a technique of gathering beams emitted from multiple laser diodes into one is required.

Therefore, such a high power laser system implements high power of a pumping light source using free space spatial combining, polarization, and wavelength multiplexing superposition techniques.

Spatial combining technology is a technology that optimizes spatial arrangement to increase the light output of multiple semiconductor lasers, and wavelength beam combining technology uses multiple wavelength couplers to transmit multiple beams having different wavelengths. It refers to a technology that can increase the light output while being constant in size. In addition, the polarization beam combining technology is a technique that uses the properties of a general laser having two polarizations, so that two polarization beams of a single laser are passed through a polarization coupler so that they are perpendicular to each other, while the light output is combined while the size of the beam Is a technique to keep it constant.

Among them, the polarization beam combining technology illustrated in FIG. 1 has a problem in that output loss due to a polarizer occurs according to a value of a Polarization Extinction Ratio (PER) of an LD (Laser Diode) chip, and also a polarization beam combiner The inning technology also has a problem in that output loss through the polarizer is gradually increased due to thermal and physical stress applied through the module packaging process.

That is, when the polarization beam combining technology is used, stress such as heat and pressure occurs in a chip on submount (CoS) process of die-bonding an LD chip to a sub mount, resulting in polarization characteristics of the LD chip. Even if this worsens and CoS is bonded to the package, a polarization characteristic deteriorates due to stress due to heat and pressure.

On the other hand, using the spatial beam combining technique shown in FIG. 2, it is possible to collect light output from the LD chip into one optical fiber without output loss due to the PER of the LD chip. However, using the spatial beam combining technique has a disadvantage in that the optical fiber on which the laser is finally focused becomes thicker.

The present invention has been devised to solve the above-mentioned problems, and the main technical problem to be achieved by the present invention is to use a laser diode module using a spatial beam combining technique that uses two parabolic mirrors that share focus while having different focal lengths. Is to provide.

In addition, another technical problem to be achieved by the present invention, while avoiding the output loss due to the PER generated in the polarization beam combining technology, the beam as a condensing method that minimizes the increase in the size of the core diameter of the optical fiber, which is a disadvantage of the spatial beam combining technology. It is to provide a laser diode module for focusing to generate a high power laser.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. There will be.

In order to solve the above technical problem, an embodiment of the present invention, in a laser diode module, the laser providing unit using a plurality of lasers providing a plurality of laser beams and a plurality of different parabolic mirrors sharing a focus It provides a laser diode module including a laser focusing unit for focusing a plurality of laser beams oscillated from.

In one embodiment of the present invention, the laser providing unit may include a first laser diode and a second laser diode that are respectively positioned to emit laser beams including vertical and horizontal components and face each other on the same substrate.

In one embodiment of the present invention, a laser beam including vertical and horizontal components provided from the first laser diode and the second laser diode is converted into parallel light, and the laser beam converted into parallel light is reflected. By doing so, it may further include a laser transmission unit for transmitting to the laser focusing unit.

In one embodiment of the present invention, the laser transmission unit includes a first fast axis collimation (FAC) member and a first SAC that converts vertical and horizontal laser beams emitted from the first laser diode into parallel light, respectively. (Slow Axis Collimation) A laser having vertical and horizontal components emitted from the first optical structure and the second laser diode having a member and a first mirror that reflects and transmits the laser beam converted into a parallel light to the laser focusing unit. A second FAC (Fast Axis Collimation) member and a second SAC (Slow Axis Collimation) member that converts the beam into parallel light, respectively, and a second mirror that reflects the laser beam converted into the parallel light and transmits it to the laser focusing unit It may include a second optical structure having a.

In one embodiment of the present invention, the first optical structure may be formed in a structure in which a first FAC member, a first SAC member, and a first mirror are sequentially arranged based on the front surface of the first laser diode. The second optical structure may be formed in a structure in which a second FAC member, a second SAC member, and a second mirror are sequentially arranged based on the front surface of the second laser diode.

In one embodiment of the present invention, when the first laser diode and the first optical structure are added as the first laser providing means, and when the second laser diode and the second optical structure are referred to as the second laser providing means, The laser diode module may include a first laser diode array having a plurality of the first laser providing means and a second laser diode array having a plurality of the second laser providing means, and the first laser diode The array may be formed in a step shape in which the plurality of first laser providing means each have a predetermined height step at a predetermined interval so that the optical paths of the respective laser beams provided from the plurality of first laser providing means do not interfere with each other. The second laser diode array may be provided by a plurality of second laser providing means. To avoid the optical path of each laser beam is ball interfering with one another, said plurality of second laser provided with means for each predetermined distance can be formed of a staircase type having a predetermined height level difference.

In one embodiment of the present invention, the laser focusing unit may include a first parabolic mirror and a second parabolic mirror that share a focus, and the first parabolic mirror reflects the laser beam provided from the laser providing unit to remove the first 2 can be transmitted to the parabolic mirror, the second parabolic mirror can be made in the form of parallel light by reflecting the laser beam reflected from the first parabolic mirror.

In one embodiment of the present invention, the laser beam of the plurality of horizontal components provided from the first laser diode array and the second laser diode array passes through the first parabolic mirror and the second parabolic mirror, and By the ratio of the distance between the focal point of the parabolic mirror and the distance between the focal point and the focal point of the second parabolic mirror, the distance between the beams may be reduced to form a parallel light.

In addition, according to an embodiment of the present invention, in a laser diode module including a laser providing unit, a laser transmitting unit and a laser focusing unit, the laser providing unit includes a first laser diode array and a second laser formed to face on the same substrate. Including a diode array, the first laser diode array and the second laser diode array are provided with a plurality of laser providing means for emitting laser beams of vertical and horizontal components, respectively, wherein the laser beam is oscillated from the plurality of laser providing means It is formed in a step shape having a predetermined height step at regular intervals so that the optical path of the one does not interfere with each other, the laser transmission unit, the vertical and horizontal components provided from the first laser diode array and the second laser diode array Having one or more laser beams parallel Converted to a shape and transmitted to the laser focusing unit, and the laser focusing unit converts one or more laser beams converted into parallel light from the laser transmission unit by using a first parabolic mirror and a second parabolic mirror that share focus. After passing through the focus lens in the form, and focusing on the optical fiber, the laser beam of at least one horizontal component provided from the first laser diode array and the second laser diode array passes through the first parabolic mirror and the second parabolic mirror , It is possible to provide a laser diode module characterized in that it has a form of parallel light that is reduced by a ratio between the focal point of the second parabolic mirror and the distance between the focal point and the focal point of the first parabolic mirror.

According to the present invention, by reducing the distance between a plurality of horizontal components of the laser beam provided from the laser diode array by using two parabolic mirrors sharing the focus, the size of the optical fiber to which the plurality of laser beams are finally condensed is reduced. The size of the laser diode module package can be reduced.

Further, according to the present invention, by implementing a spatial beam combining technique, it is possible to avoid output loss due to PER generated in the polarization beam combining technique.

Further, according to the present invention, the laser diode array is implemented in the form of a staircase, so that the optical paths of the lasers oscillated in each laser diode constituting the laser diode array are not interfered with each other.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a view illustrating a conventional polarization beam combining technique.
2 is a diagram illustrating a conventional spatial beam combining technique.
3 is a block diagram showing the configuration of a laser diode module according to an embodiment of the present invention.
4 is a cross-sectional view showing a detailed configuration of a laser diode module according to an embodiment of the present invention.
5 is a schematic diagram schematically showing the structure of a laser diode module according to an embodiment of the present invention.
6 is a view illustrating a laser beam focusing method of a first parabolic mirror and a second parabolic mirror according to an embodiment of the present invention.
7 is a diagram illustrating an example of focusing a laser beam of a vertical component according to an embodiment of the present invention.
8 is a diagram illustrating an example of focusing a horizontal component laser beam according to an embodiment of the present invention.
9 is a view showing the appearance of an exemplary model of a laser diode module according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention It should be understood to include water, equivalents or substitutes. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the size, shape, and shape of each component shown in the drawings can be variously modified, and the same / similar parts of the entire specification The same / similar reference numerals are attached.

The suffixes “array”, “means”, “modules” and “parts” for components used in the following description are given or mixed by considering only the ease of writing the specification, and have a meaning or role distinguished from each other in itself. It does not have. In addition, in describing the embodiments disclosed in this specification, detailed descriptions of related well-known technologies are omitted when it is determined that the gist of the embodiments disclosed herein may obscure the subject matter.

Throughout the specification, when a part is said to be "connected (connected, contacted, or joined)" with another part, this means not only when it is "directly connected (connected, contacted, or joined)", but also other members in the middle. Also included is a case in which they are "indirectly connected (connected, contacted, or combined)" between them. Also, when a part is said to "include (equipment or provision)" a component, it does not exclude other components unless specifically stated to "include (equipment or provision)" other components. It means you can.

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Further, terms including ordinal numbers such as first and second used in the present specification may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

3, 4 and 5 are each a block diagram showing the configuration of a laser diode module (hereinafter referred to as “laser diode module 1”) according to an embodiment of the present invention, a cross-sectional view showing a detailed configuration and As a schematic diagram schematically showing the structure, the laser diode module 1 will be described in detail below with reference to FIGS. 3 to 5.

For convenience, the reference numerals for some of the components of the laser diode module 1 may be omitted in FIGS. 3 to 5, but the drawings illustrated in FIGS. 3 to 5 show different aspects of the laser diode module 1. It turns out that the same laser diode module 1 is shown as shown in.

3 to 5, the laser diode module 1 includes a laser providing unit 100 providing two or more laser beams, and a laser providing unit using a plurality of different parabolic mirrors sharing a focus ( It includes a laser focusing unit 300 for focusing two or more laser beams oscillated from 100).

In addition, the laser diode module 1 converts a laser beam including vertical and horizontal components oscillated from the laser providing unit 100 into parallel light, reflects the laser beam, and transmits the laser beam to the laser focusing unit 300 ( 200, and a substrate 400 on which at least one of the laser providing unit 100, the laser transmission unit 200, and the laser focusing unit 300 is formed on one surface may be further included.

For example, the laser diode module 1 may have a laser providing unit 100, a laser transmission unit 200, and a laser focusing unit 300 formed on or formed on the substrate 400, or a laser diode formed in this form. The appearance of the actual example model of the module 1 is shown in FIG. 9.

First, the laser providing unit 100 emits a plurality of laser beams including vertical and horizontal components, and the first laser diode array 110 and the second laser diode array 120 positioned to face each other on the same substrate. It can contain.

The first laser diode array 110 may include a plurality of first laser diodes 111 that oscillate a laser beam including vertical and horizontal components, and the second laser diode array 120 also includes vertical and horizontal components. A plurality of second laser diodes 121 for oscillating the included laser beam may be provided.

Generally, a single laser beam has vertical and horizontal component laser beams, where a vertical component laser beam means a laser component having a vertical optical axis, and a horizontal component laser beam means a laser component having a horizontal optical axis. It means, the laser beam described in accordance with various embodiments of the present invention is the same as the above laser beam.

Here, in order to prevent the optical paths of the respective laser beams provided by the plurality of first laser diodes 111 from interfering with each other, the first laser diode array 110 has a plurality of first laser diodes 111 at regular intervals. It may be placed and formed in a step shape having a predetermined height step.

Similarly, in order to prevent the optical paths of the respective laser beams provided by the plurality of second laser diodes 121 from interfering with each other, the second laser diode array 120 has a plurality of second laser diodes 121 at regular intervals. It can be formed in the form of a step with a predetermined height step.

Accordingly, the laser beams emitted from the laser providing unit 100 may not overlap each other's optical paths.

Next, the laser transmission unit 200 includes a first optical structure 210 for transmitting a plurality of laser beams provided from the first laser diode array 110 to the laser focusing unit 300, and a second laser diode array ( 120) may include a second optical structure 220 that transmits the plurality of laser beams provided to the laser focusing unit 300.

The first optical structure 210 includes a first fast axis collimation (FAC) array 2110 for converting a plurality of vertical component laser beams emitted from the first laser diode array 110 into a parallel light form, and a first laser The first SAC (Slow Axis Collimation) array 2130 for converting the laser beams of the plurality of horizontal components emitted from the diode array 110 into parallel light forms and the laser beam emitted from the first laser diode array 110 or the above A first mirror array 2150 may be provided by reflecting the laser beam converted into a parallel light by one member and transmitting it to the laser focusing unit 300.

The first FAC array 2110 includes a plurality of first FAC members 211, the first SAC array 2130 includes a plurality of first SAC members 213, and the first mirror array 2150 includes It may be formed in a form including a plurality of first mirrors 215.

Therefore, in other words, the first optical structure 210 includes a first FAC member 211 for converting laser beams of vertical and horizontal components emitted from the first laser diode 111 into parallel light, respectively, and the first optical structure 210. The SAC member 213 and the first mirror 215 that reflects the laser beam emitted from the first laser diode 111 and transmits the laser beam to the laser focusing unit 300 may be provided.

In addition, in the first optical structure 210, the first FAC array 2110, the first SAC array 2130, and the first mirror array 2150 are sequentially sequentially based on the front surface of the first laser diode array 110. It may be arranged or arranged.

That is, the first FAC member 211, the first SAC member 213, and the first mirror 215 may be sequentially arranged or provided based on the front surface of the first laser diode 111.

The second optical structure 220 includes a second fast axis collimation (FAC) array 2210 that converts a plurality of vertical component laser beams emitted from the second laser diode array 120 into a parallel light form, and a second laser The second slow axis collimation (SAC) array 2230 for converting a plurality of horizontal component laser beams emitted from the diode array 120 into parallel light forms and the laser beams emitted from the second laser diode array 120 or the above A second mirror array 2250 may be provided by reflecting the laser beam converted into a parallel light by one member and transmitting it to the laser focusing unit 300.

The second FAC array 2210 includes a plurality of second FAC members 221, the second SAC array 2230 includes a plurality of second SAC members 223, and the second mirror array 2250 includes It may be formed in a form including a plurality of second mirrors 225.

Accordingly, in other words, the second optical structure 220 includes a second FAC member 221 for converting the vertical and horizontal laser beams emitted from the second laser diode 121 into parallel light, respectively, and the second optical structure 220. The SAC member 223 and a second mirror 225 reflecting the laser beam emitted from the second laser diode 121 and transmitting the laser beam to the laser focusing unit 300 may be provided.

In addition, in the second optical structure 220, the second FAC array 2210, the second SAC array 2230, and the second mirror array 2250 sequentially based on the front surface of the second laser diode array 120. It may be arranged or arranged.

That is, the second FAC member 221, the second SAC member 223, and the second mirror 225 may be sequentially arranged or provided based on the front surface of the second laser diode 121.

The laser providing unit 100 and the laser transmitting unit 200 described so far may be implemented in the following form.

First, the first laser diode 111 and the first optical structure 210 may be added to be referred to as first laser providing means (not shown), and the second laser diode 121 and the second optical structure 220 may be used. It can be referred to as a second laser providing means (not shown).

At this time, the first laser diode array 110 may be formed in a form having a plurality of the first laser providing means, and the second laser diode array 120 includes a plurality of the second laser providing means. It can be formed in the form.

In addition, in the first laser diode array 110, the plurality of first laser providing means are predetermined at predetermined intervals so that the optical paths of the respective laser beams provided from the plurality of first laser providing means do not interfere with each other. The second laser diode array 120 may be formed in a step shape having a height difference, and the plurality of second lasers may prevent the optical paths of the respective laser beams provided from the plurality of second laser providing means from interfering with each other. The providing means may be formed in a staircase shape having a predetermined height step at a predetermined interval.

Finally, the laser focusing unit 300 includes a first parabolic mirror 310 and a second parabolic mirror 320 that share a focus, and the laser beam of parallel light reflected from the second parabolic mirror 320 is The incident focus lens 330 and the laser beam passing through the focus lens 330 may further include an optical fiber 340 focused thereon.

The first parabolic mirror 310 reflects the laser beam provided from the laser providing unit 100 and transmits it to the second parabolic mirror 320, and the second parabolic mirror 320 is reflected from the first parabolic mirror 310. The laser beam is reflected to form a parallel light, and the laser beam focus lens 330 of the parallel light form is directed.

When a plurality of laser beams in the form of parallel light enter the first parabolic mirror 310 through the laser transmission unit 200, the first parabolic mirror 310 reflects the laser beams of parallel light, respectively, and is reflected. Each laser beam passes the focus of the first parabolic mirror 310. In particular, the laser beam in the form of parallel light incident on the focus of the first parabolic mirror 310 is reflected back in the form of parallel light and passes through the focus of the first parabolic mirror 310.

Referring to FIG. 6 showing a focusing method of the first parabolic mirror 310 and the second parabolic mirror 320, the first parabolic mirror 310 and the second parabolic mirror 320 share the focus 301. In a case, a plurality of laser beams incident on the first parabolic mirror 310 in the form of parallel light are respectively reflected by the first parabolic mirror 310 and pass through the focal point 301 of the first parabolic mirror 310, so that the second gun It is incident on the water mirror 320.

The second parabolic mirror 320 reflects each incident laser beam again, and the first reflected parabolic mirror 310 and the second parabolic mirror 320 share the focus 301 of each laser beam reflected again. It becomes a parallel light again.

At this time, the ratio of the distance (d1) of the focal point (301) and the vertex (311) of the first parabolic (310) and the distance (d2) of the focal point (301) and the vertex (321) of the second parabolic (320) The distance between the laser beams reflected by the second parabolic mirror 320 may be changed using.

That is, after the laser beams of the plurality of vertical components provided by the laser providing unit 100 and having a form spreading vertically, become parallel light through the first FAC array 2110 or the second FAC array 2210, Even if it passes through the first SAC array 2130 or the second SAC array 2230, or is reflected by the first parabolic mirror 310 and the second parabolic mirror 320, the shape of the parallel light is continuously maintained, and thereafter focus It is incident on the lens 330 and is focused on the optical fiber 340.

In addition, the laser beams of the plurality of horizontal components provided by the laser providing unit 100 and having a horizontal spread form are converted into parallel light through the first SAC array 2130 or the second SAC array 2230. Then, when passing through the first parabolic mirror 310 and the second parabolic mirror 320 that share the focus, the distance (d1) and the second (d1) of the focal point (301) and the vertex (311) of the first parabolic mirror (310) It is in the form of a parallel light that is reduced by the ratio of the distance d2 between the focal point 301 and the vertex 321 of the parabolic mirror 320.

Specifically, the laser beams of the plurality of horizontal components provided from the laser providing unit 100 are in the form of a plurality of parallel lights having a distance between them through the laser transmission unit 200, and then the first parabolic mirror 310 and the second When passing through the parabolic mirror 320, the distance between d2 / d1 is reduced to form a plurality of parallel lights.

At this time, d1 and d2 used may be variously set according to the size of components including the focus lens 330 and the optical fiber 340 used.

7 is a view showing an example of focusing a laser beam of a vertical component according to an embodiment of the present invention, and shows a path and a shape of a plurality of vertical component laser beams provided by the first laser diode 111 . 701 is a side view of the beam path of the vertical component.

As described above, a plurality of vertical component laser beams having a vertically spread form provided by the first laser diode 111 becomes a parallel light through the first FAC array 2110, and then the first SAC array Even if it passes through (2130), or is reflected by the first parabolic mirror 310 and the second parabolic mirror 320, the shape of the parallel light is continuously maintained, and then incident on the focus lens 330 to the optical fiber 340 It becomes condensed.

7 shows the path and shape of a plurality of vertical component laser beams provided by the first laser diode 111, but also the path and shape of a vertical component laser beam provided by the second laser diode 121 Can be similar

For example, although not shown, the laser beam of the vertical component having a vertically spread form provided by the second laser diode 121 becomes a parallel light through the second FAC array 2210, and then the second SAC array ( Even though it passes through 2230 or is reflected by the first parabolic mirror 310 and the second parabolic mirror 320, the shape of the parallel beam is continuously maintained, and then incident on the focus lens 330 and condensing on the optical fiber 340 Can be.

8 is a view showing an example of focusing a horizontal component laser beam according to an embodiment of the present invention, and shows a path and a shape of a plurality of horizontal component laser beams provided by the second laser diode 121 . 801 is a view looking at the path of the laser beam of the horizontal component as viewed from above.

The laser beams of a plurality of horizontal components having a horizontally spread form provided by the second laser diode 121 are converted into parallel light through the second SAC array 2230, and then a first parabolic mirror that shares focus. When passing through 310 and the second parabolic mirror 320, the distance 301 of the focal point 301 and the vertex 311 of the first parabolic mirror 310 and the focal point 301 of the second parabolic mirror 320 The distance between the beams is reduced by the ratio of the distance d2 of the apex 321 and the parallel light.

 8 shows the path and shape of a plurality of horizontal component laser beams provided by the second laser diode 121, but the path and shape of a horizontal component laser beam provided by the first laser diode 111 is also the same. Can be similar

For example, although not shown, the laser beams of a plurality of horizontal components having a horizontally spread form provided by the first laser diode 111 are converted into parallel light through the first SAC array 2130, and then focus. When passing through the shared first parabolic mirror 310 and the second parabolic mirror 320, the distance d1 between the focal point 301 and the vertex 311 of the first parabolic mirror 310 and the second parabolic mirror 320 ) May be in the form of a parallel light that is reduced by the ratio of the distance d2 between the focal point 301 and the vertex 321.

When the laser diode module 1 described above with reference to FIGS. 1 to 9 is described in another aspect, it may be as follows.

The laser diode module 1 may include a laser providing unit 10, a laser transmission unit 200, and a laser focusing unit 300.

Here, the laser providing unit 100 includes a first laser diode array 110 and a second laser diode array 120.

The first laser diode array 110 and the second laser diode array 120 are formed in a step shape having a predetermined height step at regular intervals so that the optical paths of the oscillating laser beams do not interfere with each other, vertical and horizontal Each of the laser providing means for emitting a laser beam of the component is provided with one or more (or a plurality), it may be formed to face on the same substrate.

The laser transmission unit 200 converts one or more laser beams having vertical and horizontal components provided from the first laser diode array 110 and the second laser diode array 120 into parallel light, and thus the laser focusing unit 300. Can be delivered to.

The laser focusing unit 300 uses the first parabolic mirror 310 and the second parabolic mirror 320 to share the focal point, and the laser beam in the form of one or more parallel beams converted from the laser beam transmitting unit 200 is again collimated. After passing through the focus lens 330 in the form, it can be focused on the optical fiber 340.

In addition, the laser beam of one or more horizontal components provided from the first laser diode array 110 and the second laser diode array 120 passes through the first parabolic mirror 310 and the second parabolic mirror 320, and is second. The distance between the beams by the ratio of the distance between the focal point and the vertex of the parabolic mirror 320 and the distance between the focal point and the vertex of the first parabolic mirror 310 may be reduced.

When the laser diode module 1 described above is used, two parabolic mirrors that share the focus can be applied to the laser diode module to narrow the distance between the collimated lights that are finally condensed and converge them onto the optical fiber.

In addition, when the laser diode module 1 is implemented, the size of an optical fiber in which a plurality of beams are finally condensed can be reduced by using two parabolic mirrors that share focus, and the size of the laser diode module package can be reduced. . The laser diode module 1 is a module to which spatial beam combining technology is applied, and can avoid output loss due to PER generated in the polarization beam combining technology.

Specifically, according to the present invention, in manufacturing a laser diode module having two laser diode arrays to which spatial beam combining technology is applied, by narrowing the distance between parallel light emitted from each array, conventional spatial beam combining technology Compared to the applied laser diode module, the size of the core of the optical fiber converged through the focus lens can be reduced, and the loss due to PER can be reduced compared to the laser diode module with polarization technology, thereby increasing the output of the laser diode module.

In addition, after making a plurality of laser beams provided by two arrays into parallel light, they must be collected in one optical fiber through a focus lens. Conventionally, if the size of a beam incident on the focus lens is large, the numerical aperture (NA) of the optical fiber is increased. There was a problem in that the distance between the focus lens and the optical fiber had to be separated to a certain degree because the optical fiber had to be condensed while satisfying, which eventually resulted in a problem that the size of the package was increased. Even if the focal length of is short, a structure capable of condensing a plurality of parallel light onto a single optical fiber is realized, so that when the NA of the optical fiber is the same, the size of the package can be reduced.

The above description of the present invention is for illustration only, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified to other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted to be included in the scope of the present invention.

100: laser supply unit
110: first laser diode array 111: first laser diode
120: second laser diode array 121: second laser diode
200: laser transmission unit
210: 1st optical structure 211: 1st FAC member
213: first SAC member 215: first mirror
220: second optical structure 221: second FAC member
223: second SAC member 225: second mirror
300: laser focusing part
310: first parabolic diameter 320: second parabolic diameter
330: focus lens 340: optical fiber
400: substrate

Claims (9)

In the laser diode module,
A laser providing unit providing a plurality of laser beams; And
It includes a laser focusing unit for focusing a plurality of laser beams oscillated from the laser providing unit using a plurality of different parabolic mirrors that share a focus,
The laser providing unit includes a plurality of first laser diodes and a second laser diode that are positioned to emit laser beams containing vertical and horizontal components, respectively, and face each other on the same substrate, and the plurality of first and second lasers The diode is formed in the form of a step with a predetermined height step at regular intervals so that the optical paths of the oscillating laser beams do not interfere with each other,
The laser beam including the respective vertical and horizontal components provided from the first laser diode and the second laser diode is converted into parallel light, and the laser beam converted into the parallel light is reflected and transmitted to the laser focusing unit. Further comprising a laser transmission,
The laser focusing part includes a first parabolic mirror and a second parabolic mirror that share a focal point, and the first parabolic mirror reflects the laser beam provided from the laser providing unit and transmits the second parabolic mirror to the second parabolic mirror. The mirror reflects the laser beam reflected from the first parabolic mirror to form a parallel light,
The laser beam of the plurality of horizontal components provided from the first laser diode and the second laser diode passes through the first parabolic mirror and the second parabolic mirror, and the distance between the focal point and the vertex of the first parabolic mirror and the first 2 The laser diode module, characterized in that the distance between the beams is reduced by the ratio of the parabolic focal point and the distance between the vertices.
delete delete According to claim 1,
The laser transmission unit,
A first FAC (Fast Axis Collimation) member and a first SAC (Slow Axis Collimation) member for converting the laser beams of vertical and horizontal components emitted from the first laser diode into parallel light, respectively, and converted into a parallel light form A first optical structure having a first mirror that reflects a laser beam and transmits it to the laser focusing unit; And
A second FAC (Fast Axis Collimation) member and a second SAC (Slow Axis Collimation) member for converting vertical and horizontal laser beams emitted from the second laser diode into parallel light, respectively, and converted into a parallel light form And a second optical structure having a second mirror reflecting the laser beam and transmitting the laser beam to the laser focusing unit.
The method of claim 4,
The first optical structure,
A first FAC member, a first SAC member, and a first mirror are formed in a structure sequentially arranged based on the front surface of the first laser diode,
The second optical structure
A laser diode module, characterized in that a second FAC member, a second SAC member, and a second mirror are sequentially formed on the basis of the front surface of the second laser diode.
The method of claim 4,
When the first laser diode and the first optical structure are added to be referred to as first laser providing means and the second laser diode and the second optical structure are referred to as second laser providing means,
The laser diode module includes a first laser diode array having a plurality of the first laser providing means, and a second laser diode array having a plurality of the second laser providing means,
In the first laser diode array, the plurality of first laser providing means each have a predetermined height step so that the optical paths of the respective laser beams provided from the plurality of first laser providing means do not interfere with each other. It is formed in the form of stairs,
In the second laser diode array, the plurality of second laser providing means each have a predetermined height step so that the optical paths of the respective laser beams provided from the plurality of second laser providing means do not interfere with each other. Laser diode module, characterized in that formed in the form of steps
delete delete In the laser diode module including a laser providing unit, a laser transmission unit and a laser focusing unit,
The laser providing unit includes a first laser diode array and a second laser diode array formed to face on the same substrate,
The first laser diode array and the second laser diode array are provided with a plurality of laser providing means for emitting a laser beam including vertical and horizontal components, respectively, but the optical path of the laser beam oscillated from the plurality of laser providing means is It is formed in the form of stairs with a predetermined height step at regular intervals so as not to interfere with each other,
The laser transmission unit converts one or more laser beams having vertical and horizontal components provided from the first laser diode array and the second laser diode array into parallel light and transmits them to the laser focusing unit,
The laser focusing unit uses a first parabolic mirror and a second parabolic mirror that share focus to pass one or more laser beams converted from the laser transmission unit into a parallel light type through a focus lens in a parallel light form, and then focus on the optical fiber. ,
The laser beam of at least one horizontal component provided from the first laser diode array and the second laser diode array passes through the first parabolic mirror and the second parabolic mirror, and the distance between the focal point and the vertex of the second parabolic mirror and the The laser diode module, characterized in that the distance between the beams is reduced by the ratio of the distance between the focal point and the vertex of the first parabolic mirror.

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