A long optical path scanning system

Abstract

The application relates to the technical field of optics, in particular to a long optical path scanning system. The long optical path scanning system comprises an incident light generator for outputting a horizontal incident light beam; a total reflection light beam back reflector, an incident surface of the total reflection light beam back reflector being used for receiving the incident light beam, the incident light beam forming an outgoing light beam after undergoing multi-stage total reflection in the total reflection light beam back reflector, the outgoing light beam being output from an outgoing surface of the total reflection light beam back reflector, the incident light beam and the outgoing light beam being parallel; and an outgoing light receiver for receiving the outgoing light beam, the incident light generator and the outgoing light receiver being arranged on the same side of the total reflection light beam back reflector. The long optical path scanning system has the beneficial effects that the optical structure is simplified, the debugging difficulty of an operator is reduced, the influence on optical system data collection is reduced, the processing is simple, the system cost is reduced compared with the high-precision processing required by a relative long optical path optical system, and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical technology, and particularly relates to a long optical path scanning system. BACKGROUND

[0002] In a coherent detection optical system, a variable optical delay means is needed to cause a relative delay between input and detection light, so as to realize scanning and detection of a to-be-measured pulse waveform by a super-short pulse; a scanning delay device produces an adjustable optical path by adjusting the light of an input module and an output module, thereby producing a corresponding light transmission delay; such a device plays an important role in a self-correlation instrument super-short pulse measurement, a terahertz time-domain spectroscopy system, a time-domain optical coherence tomography system, an infrared Fourier transform spectrometer, a pump detection system, and the like; a scanning delay range and a scanning speed are several important technical indexes of the scanning delay device.

[0003] At present, there are various optical path scanning systems on the market, but there are few long optical path scanning systems; increasing a scanning optical path will reduce the stability of an optical path, for example, in a terahertz time-domain spectroscopy system, in order to match a longer spatial optical path of a probe, a single optical fiber is mostly replaced, or a compensation optical path is added; the former will introduce a laser dispersion problem, which greatly affects the whole system; the latter increases additional optical elements, so that the system is not stable, and the cost is increased. SUMMARY

[0004] The present application aims to provide a long optical path scanning system to solve the above technical problems.

[0005] The technical problems solved by the present application can be solved by the following technical solutions.

[0006] A long optical path scanning system comprises,

[0007] An incident light generator is configured to output a horizontal incident light beam.

[0008] A total reflection light beam reflector is configured to receive the incident light beam; the incident light beam forms an outgoing light beam after multiple total reflections in the total reflection light beam reflector; the outgoing light beam is output from an outgoing surface of the total reflection light beam reflector; the incident light beam and the outgoing light beam are parallel.

[0009] An outgoing light receiver is configured to receive the outgoing light beam; the incident light generator and the outgoing light receiver are arranged on the same side of the total reflection light beam reflector.

[0010] Preferably, the total reflection light beam reflector comprises a sharp corner portion and a rectangular portion; the sharp corner portion and the rectangular portion are integrally formed and in communication with each other; the sharp corner portion and the rectangular portion form a closed total reflection light beam reflector.

[0011] The sharp corner portion comprises the incident surface and the exit surface, and an included angle is formed between the incident surface and the exit surface, and the included angle is an acute angle;

[0012] The rectangular portion comprises two long sides respectively connected with the incident surface and the exit surface, and a tail plane perpendicular to the long sides;

[0013] The incident light beam enters the rectangular portion after being refracted on the inner surface of the incident surface, and then reaches the exit surface after multiple total reflections, and the exit light beam is formed after being refracted on the inner surface of the exit surface.

[0014] Preferably, the total reflection light beam reflector is made of a light-transmitting material with a refractive index greater than air, and if the inner surface of the rectangular portion cannot achieve total reflection, a reflective film layer is coated on the inner surface to make the incident light beam achieve total reflection in the rectangular portion.

[0015] Preferably, if the tail plane cannot achieve total reflection, a reflective film layer is coated on the inner surface of the tail plane to make the incident light beam achieve total reflection in the tail plane.

[0016] Preferably, the total reflection light beam reflector is arranged on a linear mechanism, and the linear mechanism drives the total reflection light beam reflector to move linearly horizontally towards or away from the incident light generator, thereby adjusting the optical path scanning delay of the long optical path scanning system.

[0017] Preferably, the spatial optical path of the long optical path scanning system is obtained by processing the following formula:

[0018] A2 = n1x1 + n2x2 + Δx

[0019] Wherein,

[0020] A2 is used to represent the spatial optical path;

[0021] n1 is used to represent the refractive index of the optical path propagation medium;

[0022] n2 is used to represent the refractive index of the total reflection light beam reflector;

[0023] x1 is used to represent the optical path of the inherent spatial light;

[0024] x2 is used to represent the optical path of the light beam in the total reflection light beam reflector;

[0025] Δx is used to represent the displacement of the linear motion mechanism;

[0026] When the sign of Δx is negative, it means that the current position of the linear motion mechanism is closer to the incident light generator relative to the initial position;

[0027] When the sign of Δx is positive, it means that the current position of the linear motion mechanism is farther away from the incident light generator relative to the initial position.

[0028] Preferably, the incident light generator comprises:

[0029] A first optical coupling component for optically coupling an external light source to output the incident light beam emitted by the external light source to the incident surface of the total reflection light beam reflector.

[0030] Preferably, the exit light receiver comprises:

[0031] A reflecting component for reflecting the horizontal exit light beam to form a vertical exit light beam;

[0032] A second optical coupling component for receiving the vertical exit light beam and coupling the exit light beam out to an external light beam receiving device. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The figure is a system structure diagram in the embodiment of the present application;

[0034] Figure 2 The figure is a total reflection light beam reflector structure diagram in the embodiment of the present application;

[0035] Reference numerals: 1, first optical coupling component; 2, incident light beam; 3, total reflection light beam reflector; 4, linear mechanism; 5, exit light beam; 6, second optical coupling component; 7, reflecting component; 21, incident surface; 22, upper surface; 23, tail plane; 24, lower surface; 25, exit surface. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0038] The present application will be further described below with reference to the drawings and specific embodiments, but not as a limitation of the present application.

[0039] A long-path scanning system comprises,

[0040] An incident light generator for outputting a horizontal incident light beam 2;

[0041] A total reflection light beam reflector 3, an incident surface of the total reflection light beam reflector 3 is used for receiving the incident light beam 2, the incident light beam 2 forms an outgoing light beam after undergoing multiple-stage total reflection in the total reflection light beam reflector 3, the outgoing light beam is output from an outgoing surface of the total reflection light beam reflector 3, and the incident light beam 2 and the outgoing light beam are parallel;

[0042] An outgoing light receiver for receiving the outgoing light beam, and the incident light generator and the outgoing light receiver are both arranged on the same side of the total reflection light beam reflector 3.

[0043] Specifically, the total reflection light beam reflector 3 comprises a sharp corner portion and a rectangular portion, the sharp corner portion and the rectangular portion are integrally formed and in communication with each other, and the sharp corner portion and the rectangular portion constitute a closed total reflection light beam reflector 3;

[0044] The sharp corner portion comprises an incident surface and an outgoing surface, and an included angle is formed between the incident surface and the outgoing surface, and the included angle is an acute angle;

[0045] The rectangular portion comprises two long sides respectively connected to the incident surface and the outgoing surface, and a tail plane perpendicular to the long sides;

[0046] The incident light beam 2 enters the rectangular portion after refraction on the inner surface of the incident surface, and then reaches the outgoing surface after undergoing multiple-stage total reflection, and the outgoing light beam is formed after refraction on the inner surface of the outgoing surface;

[0047] Taking a simple 6-time total reflection type light beam reflecting device as an example, the light beam reaches the total reflection light beam reflector 3 through air, the total reflection light beam reflector 3 is a light-transmitting material with a relatively large refractive index, the light beam enters and refracts at the incident surface, and the refracted light beam undergoes one-stage total reflection at the lower surface 24;

[0048] The one-stage total reflection light beam is incident to the upper surface 22 to undergo two-stage total reflection;

[0049] The two-stage total reflection light beam is incident to the lower surface 24 to undergo three-stage total reflection;

[0050] The three-stage total reflection light beam is incident to the tail plane 23 to undergo total reflection, and the reflection angle needs to be calculated here, if the reflection angle cannot be totally reflected, a reflection film layer needs to be plated on the tail plane 23;

[0051] The four-stage total reflection light beam is incident to the upper surface 22 to undergo five-stage total reflection;

[0052] The five-stage total reflection light beam is incident to the lower surface 24 to undergo six-stage total reflection;

[0053] The sixth-order total reflection light beam is incident to the exit surface 25, refracted and emitted as a total reflection light beam.

[0054] Specifically, the input light beam 2 and the output light beam 5 of the total reflection light beam reflector 3 are parallel.

[0055] Specifically, the total reflection light beam reflector 3 is made of a light-transmitting material with a refractive index greater than air. If the inner surface of the rectangular portion cannot achieve total reflection, a reflective film layer is coated on the inner surface to make the incident light beam 2 achieve total reflection in the rectangular portion. The greater the refractive index, the greater the internal optical path length relative to the spatial optical path, and the greater the optical path obtained.

[0056] Specifically, if the tail plane cannot achieve total reflection, a reflective film layer is coated on the inner surface of the tail plane to make the incident light beam 2 achieve total reflection in the tail plane. The reflective film layer can be, but is not limited to, a gold film.

[0057] Specifically, the total reflection light beam reflector 3 is arranged on a linear mechanism. The linear mechanism drives the total reflection light beam reflector 3 to move linearly horizontally towards or away from the incident light generator, thereby adjusting the optical path scanning delay of the long optical path scanning system.

[0058] Specifically, the spatial optical path of the long optical path scanning system is obtained by processing the following formula:

[0059] 2 = n1x1 + n2x2 + Δx

[0060] Wherein,

[0061] A2 is used to represent the spatial optical path;

[0062] n1 is used to represent the refractive index of the optical path propagation medium;

[0063] n2 is used to represent the refractive index of the total reflection light beam reflector 3;

[0064] x1 is used to represent the optical path of the inherent spatial light;

[0065] x2 is used to represent the optical path of the light beam in the total reflection light beam reflector 3;

[0066] Δx is used to represent the displacement of the linear motion mechanism;

[0067] When the sign of Δx is negative, it means that the current position of the linear motion mechanism is closer to the incident light generator relative to the initial position;

[0068] When the sign of Δx is positive, it means that the current position of the linear motion mechanism is farther away from the incident light generator relative to the initial position;

[0069] The spatial optical path of the conventional reflector:

[0070] A1 = n1X G + Δx

[0071] wherein,

[0072] A1 is used to represent the spatial optical path;

[0073] n1 is used to represent the refractive index of the optical path propagation medium, generally the medium is air, then n1 = 1;

[0074] X G is used to represent the length of the beam turn-back;

[0075] Under the condition that the propagation distance of the beam 2 is equal to that of the conventional optical path back reflection device, the optical path of the beam 2 is multiplied to increase, and the short optical path can realize the long optical path scanning technology effect of the conventional optical path back reflection device.

[0076] Specifically, the incident light generator comprises:

[0077] The first optical coupling component 1 is used for optically coupling the external light source to output the incident light beam 2 emitted by the external light source to the incident surface of the total reflection light beam back reflector 3.

[0078] Specifically, the outgoing light receiver comprises:

[0079] The reflection component is used for reflecting the horizontal outgoing light beam to form a vertical outgoing light beam;

[0080] The second optical coupling component is used for receiving the vertical outgoing light beam and coupling the outgoing light beam to be output to the external light beam receiving device.

[0081] The above only describes the preferred embodiments of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A long optical path scanning system, characterized in that, include, Incident light generator, used to output a horizontal incident light beam; A total internal reflection beam retroreflector, wherein the incident surface of the total internal reflection beam retroreflector is used to receive the incident beam, the incident beam undergoes multiple stages of total internal reflection within the total internal reflection beam retroreflector to form an outgoing beam, and the outgoing beam is output from the outgoing surface of the total internal reflection beam retroreflector, and the incident beam and the outgoing beam are parallel. An outgoing light receiver is used to receive the outgoing light beam, and the incident light generator and the outgoing light receiver are both located on the same side of the total internal reflection beam retroreflector; The total internal reflection beam retroreflector includes a pointed corner portion and a rectangular portion, which are integrally formed and interconnected, forming a closed total internal reflection beam retroreflector. The pointed portion includes the incident surface and the exit surface, and an angle is formed between the incident surface and the exit surface, and the angle is an acute angle; The rectangular portion includes two long sides that connect the incident surface and the exit surface, respectively, and a tail plane perpendicular to the long sides; The incident beam is refracted on the inner surface of the incident surface and enters the rectangular portion. After undergoing multiple stages of total internal reflection, it reaches the exit surface and is refracted on the inner surface of the exit surface to form the exit beam. The inner surface of the tail plane is coated with a reflective film.

2. The long optical path scanning system according to claim 1, characterized in that, The total internal reflection beam retroreflector is made of a light-transmitting material with a refractive index greater than that of air. If the inner surface of the rectangular portion cannot achieve total internal reflection, a reflective film is deposited on the inner surface so that the incident beam can achieve total internal reflection in the rectangular portion.

3. The long optical path scanning system according to claim 1, characterized in that, The total internal reflection beam retroreflector is mounted on a linear mechanism. The linear mechanism drives the total internal reflection beam retroreflector to move horizontally toward the incident light generator or horizontally away from the incident light generator in a straight line, thereby adjusting the optical path scanning delay of the long optical path scanning system.

4. The long optical path scanning system according to claim 3, characterized in that, The spatial optical path of the long optical path scanning system is obtained using the following formula: ； in, A2 is used to represent the spatial optical path; n1 is used to represent the refractive index of the medium through which light propagates; n2 is used to represent the refractive index of the total internal reflection beam retroreflector; x1 is used to represent the optical path of intrinsic spatial light; x2 is used to represent the optical path length of the beam refracted back in the total internal reflection beam retroreflector; Δx is used to represent the displacement of the linear mechanism; When Δx is negative, it indicates that the current position of the linear mechanism is closer to the incident light generator relative to the initial position; When the sign of Δx is positive, it indicates that the current position of the linear mechanism is further away from the incident light generator relative to the initial position.

5. The long optical path scanning system according to claim 1, characterized in that, The incident light generator includes: A first optical coupling component is used to optically couple an external light source to output the incident beam emitted by the external light source to the incident surface of the total internal reflection beam retroreflector.

6. The long optical path scanning system according to claim 1, characterized in that, The emitted light receiver includes: A reflecting component for reflecting the horizontal outgoing beam to form a vertical outgoing beam; The second optical coupling component is used to receive the vertically emitted beam and couple the emitted beam to an external beam receiving device.

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