Mini free space isolator

Abstract

The utility model discloses a mini-type free space isolator. The mini-type free space isolator comprises a support which is arranged outside. A shell is installed in a hole position formed in the middle of the support. An input end polaroid is adhered to a light through hole formed in the middle of the shell; an annular magnetic ring is arranged in the shell; an optical rotation sheet fixing sleeve is sleeved in the magnetic ring; an optical rotation sheet is adhered to the interior of the optical rotation sheet fixing sleeve; the external part of the optical rotation sheet fixing sleeve is in threaded connection with a polarization knob; an output end polaroid is adhered to a light through hole formed in the middle of the polarization knob; and the polarization knob is adhered to the inner side of the shell. By using the isolator, the size of the isolator can be effectively reduced, and the effect of industrial production can be conveniently realized.

Description

Technical Field

[0001] This utility model belongs to the field of optical devices, specifically relating to a miniature free space isolator. Background Technology

[0002] Optical systems such as lasers and amplifiers are highly sensitive to reflected light from connectors, fusion splices, and filters. Without control, reflected light can degrade system performance and create safety hazards. Installing a free-space optical isolator within the optical system can significantly reduce the adverse effects of reflected light on the stability of the light source's spectral output power. Based on the Faraday rotation effect, the free-space isolator is a passive optical component with characteristics such as electromagnetic interference resistance, high-voltage insulation, high stability and reliability, high sensitivity, and long lifespan. Free-space isolators have significant practical implications for optical system applications. Currently, relatively mature free-space isolators in China are quite large, typically tens of millimeters in size. For some space-constrained optical systems, where internal components need to be kept to a smaller size, miniature isolators are required. Utility Model Content

[0003] This invention provides a miniature free space isolator, which can effectively reduce the size of the isolator and facilitate industrial production.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a mini free-space isolator, comprising an external support; a housing installed within a hole in the center of the support; an input polarizer adhered to a light-transmitting hole in the center of the housing; an annular magnetic ring inside the housing; a rotator fixing sleeve fitted inside the magnetic ring; a rotator adhered inside the rotator fixing sleeve; a polarization knob threadedly connected to the outside of the rotator fixing sleeve; an output polarizer adhered to a light-transmitting hole in the center of the polarization knob; and the polarization knob adhered to the inner side of the housing.

[0005] Preferably, the angle between the polarization direction of the input polarizer and the polarization direction of the output polarizer is 45°.

[0006] Preferably, the aperture of the light-transmitting hole between the outer shell and the polarization knob is 2.5 mm.

[0007] Preferably, the operating wavelength of the free space isolator is 1064 nm.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] 1. Selecting an optical rotator with a low saturation magnetic field can effectively reduce the volume of the magnetic ring, thereby reducing the size of the assembly housing;

[0010] 2. Simplify the structural design, reduce installation difficulty, and select commonly used polarizer designs to facilitate industrialization and automated production;

[0011] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 This is an assembly diagram of the miniature free-space isolator of this utility model;

[0014] Figure 2 This is an exploded view of the miniature free-space isolator of this utility model;

[0015] In the diagram: 1. Bracket, 2. Housing, 3. Input polarizer, 4. Magnetic ring, 5. Rotator, 6. Rotator fixing sleeve, 7. Output polarizer, 8. Polarization knob. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0018] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0019] Please see Figure 1-2 This utility model provides a technical solution: a mini free space isolator, which includes an external support 1; a housing 2 installed in a hole in the middle of the support 1; an input polarizer 3 bonded to a light-transmitting hole in the middle of the housing 2; an annular magnetic ring 4 inside the housing 2; a rotator fixing sleeve 6 sleeved inside the magnetic ring 4; a rotator 5 bonded inside the rotator fixing sleeve 6; a polarization knob 8 threadedly connected to the outside of the rotator fixing sleeve 6; an output polarizer 7 bonded to a light-transmitting hole in the middle of the polarization knob 8; and the polarization knob 8 bonded to the inside of the housing 2.

[0020] The angle between the polarization direction of the input polarizer 3 and the polarization direction of the output polarizer 7 is 45°. The aperture of the light-passing hole between the outer casing 2 and the polarization knob 8 is 2.5 mm. The operating wavelength of the free-space isolator is 1064 nm.

[0021] The outer shell 2 is fixed to the bracket 1. The input polarizer 3 is glued to the light-transmitting hole of the outer shell 2. The magnetic ring 4 is fitted onto the optical rotator fixing sleeve 6. The optical rotator 5 is glued inside the optical rotator fixing sleeve 6. The optical rotator fixing sleeve 6 is threadedly connected to the polarization knob 8. The output polarizer 7 is glued to the light-transmitting hole of the polarization knob 8. The polarization knob 8 is glued inside the outer shell 2. The bracket 1 has reserved fixing holes for installation in the optical path system.

[0022] Working Principle: A 2.5mm diameter miniature free-space isolator operating at a wavelength of 1064nm. The main structure includes a support 1, a housing 2, a magnetic ring 4, a rotator 5, a rotator fixing sleeve 6, a polarization knob 8, an input polarizer 3, and an output polarizer 7. The magnetic ring 4 provides a magnetic field, and the rotator 5 is located within this magnetic field. When a light beam passes through, its polarization angle is rotated by 45° under the magneto-optical rotation effect. The polarization directions of the input polarizer 3 and the output polarizer 7 are at a 45° angle. When the light beam is transmitted in the forward direction, it enters from the input polarizer 3, and the rotator 5 rotates the beam's polarization direction by 45°, aligning it with the polarization direction of the output polarizer 7, allowing normal output and achieving forward conduction. When the light beam is transmitted in the reverse direction, it enters from the output polarizer 7, and the rotator rotates the beam's polarization direction by 45°, forming a 90° angle with the polarization direction of the output polarizer 7, preventing normal light transmission and achieving reverse isolation.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniature free-space isolator, characterized in that: The mini free space isolator includes an external bracket (1); a housing (2) is installed in a hole in the middle of the bracket (1); an input polarizer (3) is attached to a light-transmitting hole in the middle of the housing (2); an annular magnetic ring (4) is provided inside the housing (2); a rotator fixing sleeve (6) is fitted inside the magnetic ring (4); a rotator (5) is attached inside the rotator fixing sleeve (6); a polarization knob (8) is threadedly connected to the outside of the rotator fixing sleeve (6); an output polarizer (7) is attached to a light-transmitting hole in the middle of the polarization knob (8); and the polarization knob (8) is attached to the inside of the housing (2).

2. The miniature free-space isolator according to claim 1, characterized in that: The angle between the polarization direction of the input polarizer (3) and the polarization direction of the output polarizer (7) is 45°.

3. A miniature free-space isolator according to claim 1, characterized in that: The aperture of the light-transmitting hole between the outer shell (2) and the polarization knob (8) is 2.5 mm.

4. A miniature free-space isolator according to claim 1, characterized in that: The free-space isolator operates at a wavelength of 1064 nm.

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