CN208707069U - The device of VCSEL laser divergence angle compression is carried out using doubly telecentric camera lens - Google Patents

Abstract

The utility model discloses a kind of devices that the compression of VCSEL laser divergence angle is carried out using doubly telecentric camera lens, including VCSEL laser at one end is arranged, the light-emitting surface of the VCSEL laser is arranged at intervals with microlens array, doubly telecentric lens group is arranged in parallel between the light-emitting surface and microlens array of the VCSEL laser, the lens that the doubly telecentric lens group is placed in parallel by two pieces form.The utility model has the advantages that can solve microlens array and the excessively close problem of VCSEL facet surface, can be compressed in the case where not changing the area of light source picture to the angle of divergence of light source picture, can improve light source image brightness.

Description

The device of VCSEL laser divergence angle compression is carried out using doubly telecentric camera lens

Technical field

The utility model relates to Optical devices, can solve microlens array and VCSEL laser table more particularly, to one kind The excessively close problem in face can compress the angle of divergence of light source picture in the case where not changing the area of light source picture, reach raising The device that the compression of VCSEL laser divergence angle is carried out using doubly telecentric camera lens of the purpose of light source image brightness.

Background technique

In edge-emitting laser, VCSEL laser has stronger antistatic effect, and the hot spot of outgoing is at circle, greatly Power VCSEL laser is often made of several independent luminous points, and the hot spot in far field, which innately has, inhibits laser speckle Effect, so that purposes of the VCSEL laser in fields such as night vision, illuminations is increasing.However, vcsel laser is remote When illumination, the angle of divergence of hot spot is larger, and common high-power V CSEL laser divergence angle often reaches currently on the market It 20 °, often requires to use multiple independent luminous points in addition VCSEL laser needs to reach certain power and is integrated, make The light-emitting area of laser of VCSEL often more other edge-emitting lasers are many times larger, this light for the rear end VCSEL System is all unfavorable, therefore the compression of beam divergence angle how is carried out on existing laser, improves VCSEL laser lamp Overall brightness just at a very real problem.Studies have found that carrying out light to VCSEL laser lamp with common lens Spot compress when, often can not improving laser device etendue, to promoted VCSEL laser overall brightness have no side Help, thus how in the area not changing light source compress VCSEL laser emergent light spot dispersion angle at one A problem for needing to solve.

Someone compresses the single luminous point of VCSEL laser using microlens array in the market, such as Fig. 2 institute Show, microlens array 20a carries out showing for hot spot compression using the non-luminous region between the luminous point 11a of VCSEL laser 10a It is intended to, as shown in Fig. 2, the luminous point of VCSEL laser 10a is utilized in each lens unit 21a in microlens array 20a Non-luminescent face between 11a has carried out angle compression to the outgoing beam of laser, while each using there is positive lens array Individually the picture of luminous point also becomes larger after luminous point imaging, but widened area does not exceed VCSEL laser luminous point and shines Non-luminescent area between point has thus reached the emergent light of compression VCSEL laser in the case of the area for not changing light source Spot dispersion angle；However, above-mentioned method is in the process of implementation, discovery has a very big problem, most important problem be because Spacing between the luminous point 11a of VCSEL laser 10a is too small, often only tens microns, and light emitting angle compares Greatly, the light beam between the adjacent luminous point 11a of VCSEL laser 10a in extremely short distance, which will do it, crosses, in this distance Except using microlens array 20a will lose original effect so that the VCSEL laser 10a of normal arrangement Microlens array 20a faces two extreme problems.1, in order to which the processing thickness for increasing microlens array 20a (avoids it because too It is thin and influence intensity), lenticule must use micro- as far as possible close to device in the VCSEL laser 10a of normal arrangement In lens array 20, microlens array 20 in order to accomplish the thickness of 0.2~0.3mm, need 20 surface of microlens array close to VCSEL laser 10a surface about 0.05mm, and it is known that VCSEL laser 10a is positive cartridge chip, surface needs routing work Skill, therefore this method is very likely to microlens array and facet surface or gold thread is caused to be in contact, it is serious to will cause Product can not work normally；Even if 2, lenticule has accomplished the spacing with VCSEL laser 10a light-emitting area 0.05mm, and 0.2 The microlens array 20a of~0.3mm is also to be very difficult to accomplish in actual processing.Above two o'clock reason causes existing This situation, although microlens array can be compressed and be mentioned to the beam angle of VCSEL laser as you know The brightness of device is risen, but there is no related actual devices to occur in the market in present.

Utility model content

To solve the above problems, the utility model aim is that providing one kind can solve microlens array and VCSEL laser The excessively close problem in device surface can compress the angle of divergence of light source picture in the case where not changing the area of light source picture, reach Improve the device that the compression of VCSEL laser divergence angle is carried out using doubly telecentric camera lens of the purpose of light source image brightness.

The utility model is realized by following technical measures, a kind of to carry out VCSEL laser hair using doubly telecentric camera lens The device for dissipating angle compression, including VCSEL laser at one end is arranged, the light-emitting surface of the VCSEL laser is arranged at intervals with Microlens array is arranged in parallel with doubly telecentric lens group between the light-emitting surface and microlens array of the VCSEL laser, described The lens that doubly telecentric lens group is placed in parallel by two pieces form.

Each lenticule of the microlens array is plano-convex lens as a preferred method, the plano-convex lens Convex surface close to and towards the light-emitting surface of VCSEL laser, the plane of the plano-convex lens is far from VCSEL laser.

The convex surface of the plano-convex lens is spherical surface or free form surface as a preferred method,.

Each luminous point of the VCSEL laser is located on the optical axis of corresponding plano-convex lens as a preferred method, The adjacent luminous point scattering of the VCSEL laser is intersected in the adjacent interfaces on corresponding plano-convex lens convex surface.

It is adjacent luminous to be equal to or more than VCSEL laser for the thickness of the microlens array as a preferred method, To the distance on the luminescence chip surface of VCSEL laser at point edge light convergence.

The lens for forming the doubly telecentric lens group as a preferred method, are convex lens.

The utility model light source is VCSEL laser, and doubly telecentric lens group is made of two lens, and the picture of light source is by double remote Heart lens group is imaged at image planes, we place microlens array group near image planes, in the feelings for the area for not changing light source picture The angle of divergence of light source picture is compressed under condition, achievees the purpose that improve light source image brightness.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model embodiment.

Fig. 2 is the structural schematic diagram that microlens array carries out hot spot compression to VCSEL laser in background technique.

Specific embodiment

Below with reference to embodiment and compares attached drawing the utility model is described in further detail.

A kind of device being carried out the compression of VCSEL laser divergence angle using doubly telecentric camera lens of the present embodiment, is please referred to attached Fig. 1, including VCSEL laser 10 at one end is arranged, the light-emitting surface of the VCSEL laser 10 is arranged at intervals with lenticule battle array Column 20 are arranged in parallel with doubly telecentric lens group 30 between the light-emitting surface and microlens array 20 of the VCSEL laser 10, described Doubly telecentric lens group 30 is made of two pieces of convex lenses being placed in parallel 31,32.

In this optical system, light source is VCSEL laser, and doubly telecentric lens group 30 is made of convex lens 31,32, light The picture in source is imaged on image planes by doubly telecentric lens group 30, we place microlens array group near image planes, are not changing light The angle of divergence of light source picture is compressed in the case where the area of source image, achievees the purpose that improve light source image brightness.

Such light path design has several advantages below:

1, when by adjusting the spacing between lenticule and light source picture, it can achieve the mesh of continuous adjustment light source dispersion angle , while also avoiding lenticule and being mounted directly to light source surface, adjustment angle may be with the gold thread phase of light source or light source The problem of touching, without the harmful influence for worrying that the excessively high temperature of chip surface generates lenticule.

2, can by change convex lens 31 and convex lens 32 ratio, come realize adjustment light source area and the angle of divergence, If the focal length of convex lens 31 is less than convex lens 32, obtained image planes are less than light source itself, and the angle of divergence is greater than light source itself The angle of divergence.If the focal length of convex lens 32 is greater than convex lens 31, the angle of divergence of our available light source pictures is less than light source sheet Body, and light source image planes product is greater than light source itself.Using this feature of optical path, we can be with the diverging of flexibly adjustment light source picture Angle.For example, we can make convex lens 32 focal length be convex lens 31 several times, the light source obtained in this way seems a big face The picture of product small divergence angle can also amplify several times in the array element diameter and thickness for the microlens array that rear end is placed, in this way will Greatly reduce processing and the adjustment difficulty of microlens array.The reduction of laser energy density is it is also possible that note on micro-lens surface Penetrating molding microlens array can be used in optical system, and not have to worry that excessively high optical energy density makes lenticule battle array Column deformation even damages.

Light path design in this way, we would be possible in commercial equipment on a large scale using this lenticule battle array The technology of column greatly reduces the volume of back-end optical system by slightly increased cost, greatly reduces the installation of lenticule And adjustment difficulty, extraordinary basis is laid for extensive commercialization.

The embodiment for carrying out the device of VCSEL laser divergence angle compression using doubly telecentric camera lens one, please refers to attached drawing 1, specifically it is also possible that each lenticule of microlens array 20 is plano-convex lens 21 on the basis of technical solution in front, The convex surface of the plano-convex lens 21 is close and towards the light-emitting surface of VCSEL laser 10, and the plane of the plano-convex lens 21 is separate VCSEL laser 10.Each lenticule of microlens array 10 is plano-convex lens 21, and wherein the convex surface of plano-convex lens 21 is close And towards the light-emitting surface of VCSEL laser 10, the plane of plano-convex lens 21 is far from VCSEL laser 10；Such structure and peace Dress mode has following benefit relative to common microlens array: 1, expanding the lenticule of microlens array 20 as much as possible Array element increases the manufacturability of microlens array 20；As long as 2, the convex surface of microlens array 20 is in the hair of VCSEL laser 10 Except the confluence of luminous point 11, planar section compresses VCSEL to microlens array either in confluence or outside confluence The beam angle of laser does not have an impact, therefore can use this property, designs one rationally to the device of microlens array Processing thickness, be fully able to solve before lenticule production problem；3, the thickness of microlens array 20 is being completely solved After having to the problem other than 11 confluence of luminous point in VCSEL laser 10, lenticule battle array can be improved as far as possible Column 20 arrive the surface distance of VCSEL laser 10, reach 20 times or more of common 20 distance of microlens array, not only solve The excessively close problem of microlens array 20 and 10 surface of VCSEL laser, also effectively reduces the installation problem of lenticule device, Road has been paved for the extensive commercialization of device.

The embodiment for carrying out the device of VCSEL laser divergence angle compression using doubly telecentric camera lens one, please refers to attached drawing 1, specifically it is also possible that the convex surface of plano-convex lens 21 can be, spherical surface, aspherical, freedom is bent on the basis of technical solution in front Face or the other faces type with light-focusing function etc..

The embodiment for carrying out the device of VCSEL laser divergence angle compression using doubly telecentric camera lens one, please refers to attached drawing 1, in front specifically it is also possible that each luminous point 11 of VCSEL laser 10 is located at corresponding plano-convex on the basis of technical solution On the optical axis of lens 21, the scattering of adjacent luminous point 11 of the VCSEL laser 10 is intersected in corresponding 21 convex surface of plano-convex lens Adjacent interfaces.

The embodiment for carrying out the device of VCSEL laser divergence angle compression using doubly telecentric camera lens one, please refers to attached drawing 1, in front specifically it is also possible that the thickness of microlens array 20, which can be equal to function, is greater than VCSEL phase on the basis of technical solution To the distance (this distance is often below 0.3mm) on luminescence chip surface at adjacent luminous point rim ray convergence, can effectively solve The problem of lenticule of having determined processing.

It is to be carried out to the utility model using the device that doubly telecentric camera lens carries out the compression of VCSEL laser divergence angle above It illustrates, is used to help to understand the utility model, but the embodiments of the present invention and be not restricted to the described embodiments, it is any Without departing from changes, modifications, substitutions, combinations, simplifications made under the utility model principle, equivalent substitute mode should be, all In the protection scope of the utility model.

Claims (6)

1. a kind of device for carrying out the compression of VCSEL laser divergence angle using doubly telecentric camera lens, it is characterised in that: exist including setting The VCSEL laser of one end, the light-emitting surface of the VCSEL laser are arranged at intervals with microlens array, the VCSEL laser Light-emitting surface and microlens array between be arranged in parallel with doubly telecentric lens group, the doubly telecentric lens group is placed in parallel by two pieces Lens composition.

2. the device according to claim 1 for carrying out the compression of VCSEL laser divergence angle using doubly telecentric camera lens, feature Be: each lenticule of the microlens array is plano-convex lens, and the convex surfaces of the plano-convex lens is close to and towards VCSEL The light-emitting surface of laser, the plane of the plano-convex lens is far from VCSEL laser.

3. the device according to claim 2 for carrying out the compression of VCSEL laser divergence angle using doubly telecentric camera lens, feature Be: the convex surface of the plano-convex lens is spherical surface or free form surface.

4. the device according to claim 2 for carrying out the compression of VCSEL laser divergence angle using doubly telecentric camera lens, feature Be: each luminous point of the VCSEL laser is located on the optical axis of corresponding plano-convex lens, the phase of the VCSEL laser The luminous point scattering of neighbour is intersected in the adjacent interfaces on corresponding plano-convex lens convex surface.

5. the device according to claim 2 for carrying out the compression of VCSEL laser divergence angle using doubly telecentric camera lens, feature Be: the thickness of the microlens array, which is equal to or more than at the adjacent luminous point rim ray convergence of VCSEL laser, to be arrived The distance on the luminescence chip surface of VCSEL laser.

6. the device according to claim 1 for carrying out the compression of VCSEL laser divergence angle using doubly telecentric camera lens, feature Be: the lens for forming the doubly telecentric lens group are convex lens.