CN202904125U - A linear light beam shaping device using a total reflection method - Google Patents

Abstract

The utility model discloses a linear light beam shaping device using a total reflection method. The shaping device comprises three transparent mediums successively disposed on the propagation direction of a linear light beam and a shaped light beam and is characterized in that the refractive index of the three mediums are same. Every two mediums are mutually spliced seamlessly. The parallel surface of a first transparent medium and the parallel surface of a second transparent medium have certain inclination angles. An intersection is arranged between the parallel surface of the second transparent medium and a Z axis. The parallel surface of the first transparent medium and the parallel surface of a third transparent medium are mutually perpendicular. The light-passing incident surface of the first transparent medium is in parallel with the emitting surface of the third transparent medium. The propagation direction of the linear beam is perpendicular to the two light-passing surfaces. The shaped light beam is converted into a light beam in a given shape. The linear light beam shaping device has advantages of substantially reducing luminous energy loss, high shaping efficiency, and further improving focusing performance of a diode laser and is widely used in fields of military, scientific research, academies, and industrial and mining enterprises.

Description

The total reflection method waveform shaper of linear light beam

Technical field

The utility model relates to a kind of light-beam forming unit, particularly relates to a kind of total reflection method waveform shaper of linear light beam.

Background technology

The application of diode laser mainly contains two large purposes at present: one, directly as lasing light emitter, as in fields such as optical-fibre communications, illumination and materials processings; Its two, as the pumping source of solid state laser.The beam quality of diode laser is very poor, and its diversity on both direction is widely different, is difficult to obtain high brightness laser with common optical system, and therefore, no matter which kind of is used, and light beam all must be through the processing of the means such as collimation, shaping, focusing.

The shaping scheme that generally adopts at present has two step rearrangement methods and a step rearrangement method.

It is trapezoidal mirror method that typical two steps are reset the shaping method.What use in the product that most of companies such as JOLD provide all is trapezoidal mirror method.In addition, the in addition prism group method that belongs to twice rearrangement shaping method.

Two step rearrangement methods, complex structure is unfavorable for miniaturization and modularization on the one hand; On the other hand, because some luminous energies are all lost in reflection each time, cause the efficient after the shaping to be affected.It is very characteristic by comparison that the step that immediate development is got up is reset the shaping method.

With trapezoidal mirror method comparatively speaking, tilt column lens arra rotation shaping method is only with once going on foot the shaping rearrangement that has realized light beam, but the light of arranging out no longer is collimated light, but a rectangular distribution of dispersing in vertical direction.Also must use two post lens to focus in the horizontal and vertical directions respectively, this is so that the structure of system still seems comparatively complicated.

Though refraction shaping method can overcome the problem of reflection loss luminous energy, and structure is relatively simple, is easy to miniaturization, but when the light beam joint number that need to be cut into increased, therefore structure had still limited the further improvement of laser focused performance also with complicated.

The utility model content

The purpose of this utility model, in order to remedy the deficiencies in the prior art, through concentrating on studies, repeatedly practise checking exactly, provide a kind of linear light beam after shaping of the present utility model, become definite shape, be evenly distributed, the total reflection method waveform shaper of the linear light beam of light beam satisfactory for result.

The technical scheme of the total reflection method waveform shaper of the linear light beam that the utility model is alleged is achieved in that it is included on the linear light beam direction of propagation that is shaped line source output light beam 32 after the first transparent medium that sets gradually, the second transparent medium, the 3rd transparent medium and the shaping.It is characterized in that: as shaping the first transparent medium, the second transparent medium all has identical refractive index with the 3rd transparent medium, the second transparent medium thickness is d, mutual seamless splicing between the first transparent medium and the second transparent medium and the second transparent medium and the 3rd transparent medium, have between the parallel surface of the first transparent medium and the second transparent medium certain inclination angle (90 °-α), the intersection of the parallel surface of the second transparent medium and XOZ face and Z axis form angle β, mutually vertical between the parallel surface of the first transparent medium and the 3rd transparent medium, and the logical light entrance face of the first transparent medium and the logical light-emitting face of the 3rd transparent medium are parallel to each other, and the direction of propagation of linear light beam is vertical with the logical light entrance face of described the first transparent medium.Linear light beam is incident to the second transparent medium by the first transparent medium, realizes shaping through multiple total reflection, and the light beam after shaping becomes the light beam of setting shape.

According to total reflection principle, light is incident to optically thinner medium from optically denser medium, and as incident angle γ during greater than the angle, zero boundary of total reflection, light is in dielectric interface generation total reflection.If the logical light face of the incident of the first transparent medium is the ZOY face, simultaneously, Y is vertical direction, therefore the direction of propagation of linear light beam is X-direction.Thickness is the second transparent medium of d, and its two parallel surface and Y-axis form the α angle, and the intersection of this parallel surface and surface level (XOZ face, the i.e. parallel surface of the first transparent medium) and Z axis form the β angle simultaneously.Be parallel to the linear light beam of OZ axle along the incident of X direction of principal axis, import the second transparent medium by the first transparent medium, behind the rear parallel surface of the second transparent medium, reflect (can realize total reflection by angle design).Because the existence at α and β angle, reflected light will be to x, the run-off the straight of y direction, after reflecting equally on the previous parallel surface of the second transparent medium, again arrives parallel surface behind the second transparent medium along X-direction.Displacement has occured each luminous point of the linear light beam of this moment and the linear light beam of for the first time incident in the x and y direction but direction is parallel.Because the 3rd transparent medium of the same refractive index of splicing on the border of the second transparent medium one side has destroyed total reflection condition, therefore linear light beam one side is that the part light of a will be able to outgoing along the OZ shaft length, remaining continuation reflection, through parallel surface after arriving behind the parallel surface before the second transparent medium, the displacement that equates generation and last time simultaneously, the part light of linear light beam one side will be able to outgoing again, identical with the light beam length that went out to be shot out last time, direction is parallel, and produces the displacement of b at the y direction of principal axis.This process continues always, until all light are able to outgoing after being cut, form that n joint length a is identical, direction is parallel and is the light beam of b in y direction adjacent spaces, thereby realized cutting and reset, and has namely realized beam shaping.

The principle of cutting apart shaping according to above-mentioned total reflection, and consider that still there is certain angle of divergence in linear light beam itself, in the alleged reshaper of the utility model, the first transparent medium and the width of the second transparent medium on Z-direction should be greater than the total length L of cutting apart linear light beam before the shaping, the length a of the every trifle of the 3rd transparent medium after thickness on the Z-direction then should be divided greater than linear light beam.The second transparent medium and the 3rd transparent medium after the height of Y direction should be greater than shaping beam distribution at the height b(n-1 of Y direction) b.In addition, as shown in Figure 1, α, β and d can be by choosing the incident angle γ that satisfies total reflection condition, and after the cutting that needs between the length a of every trifle light and these trifle light spacing b on Y direction calculate and design.

Set forth the design of parameter and calculate thinking below in conjunction with the total reflection shaping method of diode laser output linearity light beam.

1) cutting umber n's determines

If the linear light beam behind collimation of diode laser output is L in the length of slow-axis direction ₀, it is at the M of fast axle and slow-axis direction ²The factor is respectively

With

Then it at the maximum umber that slow-axis direction can be cut is

2) every trifle beam length a determines

Linear light beam still has certain angle of divergence at slow-axis direction after considering collimation, establishes linear light beam and arrives that the length along slow-axis direction is L 〉=L behind the Shaping Module ₀Can get, after linear light beam was divided, the length of every trifle light beam was

3) the determining of hot spot dimension m after the shaping

Figure 2 shows that the principle signal that is coupled and focuses on after the linear light beam shaping, 33 is the distribution after the linear light beam shaping, and m represents its horizontal dimension; 34 is focus lamp, and f represents its focal length; 35 is the optical fiber that light beam is coupled in advance after the shaping, and θ represents its input aperture half-angle (the numerical aperture NA=sin θ of optical fiber).Therefore there is m to satisfy:

Namely

$m\≤2f\·\frac{\sin \mathrm{\θ}}{\sqrt{1-{\sin }^2\mathrm{\θ}}}=2f\·\frac{\mathrm{NA}}{\sqrt{1-{\mathrm{NA}}^2}}$

4) every trifle beam separation b's determines

As shown in Figure 3,36 for being shaped the rectangular distribution of rear light beam, and a is arranged ²+ (n-1) ²b ²=m ², by 2), 3) can get

$b\≤\frac{\sqrt{m^2-a^2}}{n-1}=\frac{1}{n-1}\sqrt{\frac{{4n}^2\·f^2\·{\mathrm{NA}}^2-L^2\·(1-{\mathrm{NA}}^2)}{(1-{\mathrm{NA}}^2)\·n^2}}$

5) be n for refractive index ₀Transparent optical medium, its incident angle that satisfies total reflection condition is

$\mathrm{\&gamma;}\&GreaterEqual;\arcsin \frac{1}{{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="HDA00001674683300011.png,HDA00001674683300022.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}.$

6) as shown in Figure 4, by target component a, b and the γ of above-mentioned design, can calculate design parameter d, α and the β of total reflection method waveform shaper.

$\begin{array}{cc}d=\frac{\sqrt{a^2+b^2}}{2\sin }& \&angle;\mathrm{\&alpha;}=\arcsin \frac{b\&CenterDot;\sin \mathrm{\&gamma;}}{\sqrt{a^2+b^2}}\\ \&angle;\mathrm{\&beta;}=\arccos \frac{\sqrt{a^2+b^2}\&CenterDot;\cos \mathrm{\&gamma;}}{\sqrt{a^2+b^2{\cos }^2\mathrm{\&gamma;}}}& \end{array}$

The total reflection method waveform shaper of the linear light beam that the utility model is alleged, not only utilize total reflection principle greatly to reduce the luminous energy loss, and novel in design, compact conformation, be conducive to modularization and miniaturization, it can be divided into the linear light beam shaping n part of its maximum that may reach, shaping efficient improves a lot than prior art, so further improved the focusing performance of diode laser.The utlity model has novel, reasonable in design, technological specification, non-environmental-pollution, easily form the characteristics such as industrialized mass.The utility model can be widely used in the fields such as military affairs, scientific research, universities and colleges and enterprise.

Description of drawings

Fig. 1 is total reflection light light-beam forming unit schematic diagram;

Fig. 2 is light beam coupling focusing principle schematic diagram after the shaping;

Fig. 3 is the physical dimension schematic diagram of beam distribution after the shaping;

Fig. 4 is that total reflection method realizes the schematic diagram that light beam moves.

Embodiment

The alleged concrete embodiment of reshaper of the utility model by reference to the accompanying drawings 1 to 4 be described in detail as follows:

According to total reflection principle and solid geometry knowledge, the thickness of design parameter α (parallel surface of the second transparent medium 30 and the angle of Y-axis), β (angle that the intersection of the parallel surface of the second transparent medium 30 and XOZ face and Z axis form) and d(the second transparent medium 30) and design object parameter a(cut apart the length of rear every trifle linear light beam), b(cuts apart between rear every trifle linear light beam the spacing along Y-axis) and γ (the condition incident angle of the total reflection of satisfied the second transparent medium 30) between relational expression be:

$d=\frac{\sqrt{a^2+b^2}}{2\sin \mathrm{\&gamma;}}$ $\&angle;\mathrm{\&alpha;}=\arcsin \frac{b\&CenterDot;\sin \mathrm{\&gamma;}}{\sqrt{a^2+b^2}}$

$\&angle;\mathrm{\&beta;}=\arccos \frac{\sqrt{a^2+b^2}\&CenterDot;\cos \mathrm{\&gamma;}}{\sqrt{a^2+b^2{\cos }^2\mathrm{\&gamma;}}}$

Embodiment 1: establish total length L=12mm that linear light beam 28 arrives Shaping Module, light beam 28 is cut into the n=11 joint, a * (n-1) distribution 32, the first transparent mediums 29, the second transparent medium 30, the 3rd transparent medium 31 of b=1.1 * 1.7mm are got glass SF6 to be arranged in the setting shape, and its refractive index is n ₀≈ 1.805, the incident angle γ that is incident to the second transparent medium 30 parallel surfaces get 34 ° (

), a=1.1mm, b=(1.7/10 are namely arranged) mm=0.17mm, γ=34 °.So need the first transparent medium 29 and the second transparent medium 30 at the width of Z-direction greater than 12mm, the 3rd transparent medium 31 at the thickness of Z-direction greater than 1.1mm, the first transparent medium 30 and the second transparent medium 31 should be greater than 1.7mm at the height of Y direction, 4.899 ° of the angle α ≈ of the parallel surface of the second transparent medium 30 and Y-axis, 33.6849 ° of the angle β ≈ that the intersection of the parallel surface of the second transparent medium 30 and XOZ face and Z axis form, the thickness d of the second transparent medium 30 is about 0.9948.Linear light beam 28 is shaped as the light beam 32 that setting that focusing performance is greatly improved is shaped as rectangle after the first transparent medium 29, the second transparent medium 30 and the 3rd transparent medium 31 are reset.

Embodiment 2: establish total length L=12mm that linear light beam 28 arrives Shaping Module, linear light beam 28 is cut into the n=11 joint, be arranged in to set and be shaped as the light beam 32 of b=1.1 * 1.5mm of a * (n-1), the first transparent medium 29, the second transparent medium 30, the 3rd transparent medium 31 are got glass SF6, and its refractive index is n ₀≈ 1.805, the incident angle γ that is incident to the second transparent medium 30 parallel surfaces get 36 ° (

) a=1.1mm, b=(1.5/10 namely arranged) mm=0.15mm, γ=36 °.So need the first transparent medium 29 and the second transparent medium 30 at the width of Z-direction greater than 12mm, the 3rd transparent medium 31 at the thickness of Z-direction greater than 1.1mm, the second transparent medium 30 and the 3rd transparent medium 31 should be greater than 1.5mm at the height of Y direction, 4.5310 ° of the angle α ≈ of the parallel surface of the second transparent medium 30 and Y-axis, 35.7082 ° of the angle β ≈ that the intersection of the parallel surface of the second transparent medium 30 and XOZ face and Z axis form, the thickness d of the second transparent medium 30 is about 0.9440.Linear light beam 28 is shaped as the light beam 32 that setting that focusing performance is greatly improved is shaped as rectangle after the first transparent medium 29, the second transparent medium 30 and the 3rd transparent medium 31 are reset.

Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.

The content that is not described in detail in this instructions belongs to the known prior art of this area professional and technical personnel.

Claims (4)

1. the total reflection method waveform shaper of a linear light beam, be included on linear light beam (28) direction of propagation that is shaped line source output, the first transparent medium (29) that sets gradually, the second transparent medium (30), light beam (32) after the 3rd transparent medium (31) and the shaping, it is characterized in that: as shaping the first transparent medium (29), the second transparent medium (30) all has identical refractive index with the 3rd transparent medium (31), the second transparent medium (30) thickness is d, having certain inclination angle between the parallel surface of the first transparent medium (29) and the second transparent medium (30) is 90 °-α, described α is the parallel surface of the second transparent medium (30) and the angle of y axle, the parallel surface of the second transparent medium (30) and the intersection of XOZ face and Z axis form angle β, mutually vertical between the parallel surface of the first transparent medium (29) and the 3rd transparent medium (31), the logical light-emitting face of the logical light entrance face of the first transparent medium (29) and the 3rd transparent medium (31) is parallel to each other, and the direction of propagation of linear light beam (28) is vertical with the logical light entrance face of described the first transparent medium (29), linear light beam (28) is incident to the second transparent medium (30) by the first transparent medium (29), realize shaping through multiple total reflection, the light beam after shaping (32) becomes the light beam (32) of setting shape.

2. the total reflection method waveform shaper of linear light beam according to claim 1, it is characterized in that: width should be greater than the total length L of cutting apart linear light beam (28) before the shaping on Z-direction for the first transparent medium (29) and the second transparent medium (30), the length a of the every trifle of the 3rd transparent medium (31) after the thickness on the Z-direction should be divided greater than linear light beam (28), the second transparent medium (30) and the 3rd transparent medium (31) light beam (32) after the height of Y direction is greater than shaping is distributed in height (n-1) b of Y direction, and described b is the spacing of cutting apart between rear every trifle linear light beam along the y axle: described n is not less than 2 natural number.

3. the total reflection method waveform shaper of linear light beam according to claim 1 is characterized in that: every group of design parameter α namely parallel surface and the Y-axis of the second transparent medium (30) angle, β namely unique length, the b of namely cutting apart rear every trifle linear light beam corresponding to one group of design object parameter a of angle and the d of intersection and the Z axis formation of parallel surface and the XOZ face of the second transparent medium (30) thickness that is the second transparent medium (30) namely cut apart between rear every trifle linear light beam the i.e. incident angle of the total reflection condition of satisfied the second transparent medium (30) along the spacing of Y-axis and γ.

4. the total reflection method waveform shaper of linear light beam according to claim 1 is characterized in that: the light beam after shaping (32) is set the light beam (32) that is shaped as rectangle.

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