High-reliability seed source structure

Abstract

The utility model relates to a high-reliability seed source structure. The high-reliability seed source structure comprises a semiconductor chip, a collimating lens group, an isolation unit and an optical fiber collimator which are sequentially arranged along the direction of an optical path, the semiconductor chip is used for emitting signal light; the collimating lens group is used for collimating a signal emitted by the semiconductor chip; the isolation unit is used for reversely isolating light from the optical fiber collimator; the optical fiber collimator is used for receiving the signal light emitted by the semiconductor chip. According to the utility model, the structure design is reasonable, the combination of the polarization splitting prism and the non-reciprocity optical rotation unit is adopted to realize the isolation of the reverse light, the reverse isolation light can be led out from the light path, the optical element does not have the problem of heat absorption, and the power tolerance degree of the seed source is improved; in addition, a section of coreless optical fiber is added at the front end of the single-mode optical fiber, the power density of the surface of the single-mode optical fiber is reduced, and the power tolerance degree of the optical fiber end face is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a seed source structure with high reliability. Background Art

[0002] Fiber lasers have the advantages of low cost, good stability, simple and compact structure, good beam quality and wide temperature range. Due to these advantages, fiber lasers are widely used in various fields, such as micro-machining, laser marking, military applications, medical treatment, laser radar and other fields.

[0003] In the prior art, fiber lasers usually need to add an isolator between the seed source and the gain fiber or add a polarization absorption isolator inside the seed source to protect the seed source. The use of an external isolator protection solution will attenuate the signal light output by the seed source, while adding a device and a fusion point, increasing the overall cost and process complexity of the laser; polarization absorption isolators are prone to absorbing reverse light and causing heat damage, and have limited tolerance to reverse signal light. Summary of the invention

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a seed source structure with high reliability.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A high-reliability seed source structure comprises a semiconductor chip, a collimating lens group, an isolation unit and a fiber collimator arranged in sequence along the optical path direction;

[0007] The semiconductor chip is used to emit signal light;

[0008] The collimating lens group is used to collimate the signal emitted by the semiconductor chip;

[0009] The isolation unit is composed of a first polarization beam splitter prism, a first half-wave plate, a first Faraday rotator, and a second polarization beam splitter prism, which are arranged in sequence, and is used for reversely isolating the light coming out of the optical fiber collimator;

[0010] The optical fiber collimator is composed of a coupling lens, a single optical fiber head, and a glass sleeve, wherein the single optical fiber head is composed of a single-mode optical fiber, a coreless optical fiber, and a capillary tube, and is used to receive the signal light emitted by the semiconductor chip;

[0011] The light emitted by the collimator is decomposed into a P component and an S component, which are transmitted to the second polarization beam splitter prism. After passing through the polarization beam splitter film of the second polarization beam splitter prism, the S component is reflected and then transmitted vertically upward, thereby achieving isolation of the input S light component; in addition, the P component is transmitted through the first Faraday rotator and the first half-wave plate, which is an optical rotation combination, and then the polarization state is rotated 90 degrees. Relative to the first polarization beam splitter prism, it is S light, and after being incident on the polarization beam splitter film of the first polarization beam splitter prism, it is reflected and then transmitted vertically upward, thereby achieving isolation of the input P light component.

[0012] Furthermore, the collimating lens group is an aspherical cylindrical lens, a spherical cylindrical lens or an aspherical spherical lens.

[0013] Furthermore, the first half-wave plate and the first Faraday rotator are a set of non-reciprocal optical rotation units, and the polarization direction of the signal light remains unchanged when the signal light passes from left to right, and the polarization direction rotates 90 degrees when the signal light passes from right to left.

[0014] Preferably, the isolation unit may further be further provided with one or more groups of non-reciprocal optical rotation units, and a polarization beam splitter prism may be added after each group of non-reciprocal optical rotation units.

[0015] The utility model adopts the above technical scheme, and has the following beneficial effects: the utility model has a reasonable structural design, and adopts a combination of a polarization splitter prism and a non-reciprocal optical rotation unit to achieve isolation of reverse light, and can also guide the reverse isolation light out of the optical path. The optical element does not have the problem of absorbing heat, and the power tolerance of the seed source is improved; in addition, by adding a section of coreless optical fiber to the front end of the single-mode optical fiber, the power density on the surface of the single-mode optical fiber is reduced, and the power tolerance of the optical fiber end face is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific implementations:

[0017] Figure 1 It is a schematic diagram of the structure of the first embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the optical fiber collimator in the first embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the isolation unit in the first embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the second embodiment of the utility model. DETAILED DESCRIPTION Embodiment 1

[0021] like Figure 1-3As shown, the utility model is a high-reliability seed source structure, comprising a semiconductor chip 1, a collimating lens group 2, an isolation unit 3 and a fiber collimator 4 arranged in sequence along the optical path direction;

[0022] The semiconductor chip 1 is used to emit signal light;

[0023] The collimating lens group 2 is used to collimate the signal emitted by the semiconductor chip 1; the collimating lens group 2 can be an aspherical cylindrical lens, a spherical cylindrical lens, or an aspherical spherical lens.

[0024] The isolation unit 3 is composed of a first polarization beam splitter prism 31, a first half-wave plate 32, a first Faraday rotator 33, and a second polarization beam splitter prism 34 which are arranged in sequence, and is used to reversely isolate the light coming out of the fiber collimator 4; wherein the first half-wave plate 32 and the first Faraday rotator 33 are a set of non-reciprocal optical rotation units, and the polarization direction of the signal light remains unchanged when passing from left to right, and the polarization direction rotates 90 degrees when the signal light passes from right to left.

[0025] The optical fiber collimator 4 is composed of a coupling lens 41 , a single optical fiber head 43 , and a glass sleeve 42 , wherein the single optical fiber head 43 is composed of a single-mode optical fiber 432 , a coreless optical fiber 431 , and a capillary 433 , and is used to receive the signal light emitted by the semiconductor chip 1 .

[0026] The semiconductor chip 1 emits a signal light whose polarization state is parallel to the polarization state of the first polarization beam splitter prism P. The signal light is collimated and output after passing through the collimating lens group 2. The signal light collimated and output by the collimating lens group 2 is incident on the first polarization beam splitter prism 31, and is transmitted and output after passing through the polarization beam splitter film of the first polarization beam splitter prism 31. The polarization state of the output light remains unchanged after passing through the optical rotation combination of the first half-wave plate 32 and the first Faraday rotator 33, and continues to be transmitted to the second polarization beam splitter prism 34. After passing through the polarization beam splitter film of the second polarization beam splitter prism 34, the output light is coupled and converged to the coreless optical fiber 431 by the coupling lens 41 of the optical fiber collimator 4, and finally enters the single-mode optical fiber 432.

[0027] The light emitted from the fiber collimator 4 can be decomposed into a P component and an S component, and transmitted to the second polarization beam splitter prism 34. After passing through the polarization beam splitter film of the second polarization beam splitter prism 34, the S component is reflected and then transmitted vertically upward, thereby isolating the input S light component. In addition, after the P component is transmitted through the optical rotation combination of the first Faraday rotator 33 and the first half-wave plate 32, the polarization state is rotated 90 degrees, and relative to the first polarization beam splitter prism 31, it is S light, and after being incident on the polarization beam splitter film of the first polarization beam splitter prism 31, it is reflected and then transmitted vertically upward, thereby isolating the input P light component. Embodiment 2

[0028] like Figure 4As shown, on the basis of the first embodiment, 35-a second half-wave plate, 36-a second Faraday rotator and 37-a third polarization beam splitter prism are added, and an isolation unit is added, and the optical path transmission is as follows:

[0029] The semiconductor chip 1 emits a signal light with a polarization state parallel to the polarization state of the first polarization beam splitter prism P. The signal light is collimated and output after passing through the collimating lens group 2. The signal light collimated and output by the collimating lens group 2 is incident on the first polarization beam splitter prism 31, and is transmitted and output after passing through the polarization beam splitter film of the first polarization beam splitter prism 31. The output light passes through the optical rotation combination of the first half-wave plate 32 and the first Faraday rotator 33, and the polarization state remains unchanged. The light continues to be transmitted to the second polarization beam splitter prism 34, and is transmitted and output after passing through the polarization beam splitter film of the second polarization beam splitter prism 34. The output light passes through the optical rotation combination of the second half-wave plate 35 and the second Faraday rotator 36, and the polarization state remains unchanged. The light continues to be transmitted to the third polarization beam splitter prism 37, and is transmitted and output after passing through the polarization beam splitter film of the third polarization beam splitter prism 37. The output light is coupled and converged to the coreless optical fiber 431 by the coupling lens 41 of the optical fiber collimator 4, and finally enters the single-mode optical fiber 432.

[0030] The light emitted from the fiber collimator 4 can be decomposed into a P component and an S component, and transmitted to the third polarization beam splitter prism 37. After passing through the polarization beam splitter film of the third polarization beam splitter prism 37, the S component is reflected and then transmitted vertically upward, thereby realizing the isolation of the input S component. In addition, the P component is transmitted through the optical rotation combination of the second Faraday rotator 36 and the second half-wave plate 35, and the polarization state is rotated 90 degrees. It is S light relative to the second polarization beam splitter prism 34. After being incident on the polarization beam splitter film of the second polarization beam splitter prism 34, it is reflected and then transmitted vertically upward, thereby realizing the first isolation of the input P light component. The residual P light component after the second polarization beam splitter prism 34 is transmitted through the optical rotation combination of the first Faraday rotator 33 and the second half-wave plate 32, and the polarization state is rotated 90 degrees. It is S light relative to the first polarization beam splitter prism 31. After being incident on the polarization beam splitter film of the second polarization beam splitter prism 34, it is reflected and then transmitted vertically upward, thereby realizing the second isolation.

[0031] The above describes the specific implementation of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this implementation without departing from the principle and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.

Claims

1. A high reliability seed source structure, characterized in that: It includes a semiconductor chip, a collimating lens group, an isolation unit and a fiber collimator which are sequentially arranged along the optical path direction; The semiconductor chip is used to emit signal light; The collimating lens group is used to collimate the signal emitted by the semiconductor chip; The isolation unit is composed of a first polarization beam splitter prism, a first half-wave plate, a first Faraday rotator, and a second polarization beam splitter prism, which are arranged in sequence, and is used to reversely isolate the light coming out of the optical fiber collimator; The optical fiber collimator is composed of a coupling lens, a single optical fiber head, and a glass sleeve, wherein the single optical fiber head is composed of a single-mode optical fiber, a coreless optical fiber, and a capillary tube, and is used to receive the signal light emitted by the semiconductor chip; The light emitted by the collimator is decomposed into a P component and an S component, which are transmitted to the second polarization beam splitter prism. After passing through the polarization beam splitter film of the second polarization beam splitter prism, the S component is reflected and then transmitted vertically upward, thereby achieving isolation of the input S light component; in addition, the P component is transmitted through the first Faraday rotator and the first half-wave plate, which is an optical rotation combination, and then the polarization state is rotated 90 degrees. Relative to the first polarization beam splitter prism, it is S light, and after being incident on the polarization beam splitter film of the first polarization beam splitter prism, it is reflected and then transmitted vertically upward, thereby achieving isolation of the input P light component.

2. A high reliability seed source structure according to claim 1, characterized in that: The collimating lens group is an aspherical cylindrical lens, a spherical cylindrical lens or an aspherical spherical lens.

3. A high reliability seed source structure according to claim 1, characterized in that: The first half-wave plate and the first Faraday rotator are a set of non-reciprocal optical rotation units. When the signal light passes from left to right, the polarization direction remains unchanged. When the signal light passes from right to left, the polarization direction rotates 90 degrees.

4. A high reliability seed source structure according to claim 1, characterized in that: The isolation unit may further be provided with one or more groups of non-reciprocal optical rotation units, and a polarization beam splitter prism may be added after each group of non-reciprocal optical rotation units.

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