CN203376144U - Simple and automatic test system for polarization of semiconductor laser - Google Patents

Abstract

The utility model discloses a simple and automatic semiconductor laser polarization testing system, which comprises a semiconductor laser. The emitting end of the semiconductor laser is sequentially provided with a combined optical path, a polarizing prism and a power detector. The polarizing prism is driven by a belt or a gear and controlled by a motor. The motor in the rotating device is connected, the motor-controlled rotating device includes the motor and a motor controller, the polarizing prism is connected with the motor controller through a limit switch, and the motor controls the rotating device and the power detector Connect to the computer separately. The utility model is simple to operate, can avoid errors between different detectors, and accurately measure the power values in the P and S directions, that is, accurately measure the power of the two laser modes of TM and TE. The correspondence of P and S splitting, that is, the accurate separation of the two modes of TM and TE of the same beam.

Description

A Simple and Automatic Diode Laser Polarization Testing System

technical field

The utility model relates to a semiconductor laser polarization test system, in particular to a simple and automatic semiconductor laser polarization test system.

Background technique

High-power, high-efficiency, and high-brightness semiconductor laser diodes are widely used in solid-state laser and fiber laser manufacturing, industry, medical treatment, entertainment display, and national defense due to their small size, high efficiency, long life, stability and reliability, and low cost of use. , laser communication and basic research and other fields. The application of high-power, high-efficiency, and high-brightness semiconductor laser diodes is crucial to the upgrading of industries in the fields of industry, medical care, entertainment display, and national defense in my country. It can not only help improve industrial production efficiency, but also reduce product use costs. , both energy saving and environmental protection.

All high-power semiconductor lasers adopt a strained quantum well structure, and the output is linearly polarized light. Testing the polarization of the output laser can reflect the semiconductor material of the device and the internal structure characteristics of the resonator; in the industrial application of semiconductor lasers, in order to improve the beam quality of semiconductor lasers , often using polarization coupling technology to couple linearly polarized light into circularly polarized light. Therefore, the measurement of the polarization of semiconductor lasers is of great significance to the performance detection and later use of lasers.

"Experimental Research on the Polarization Characteristics of Semiconductor Laser Array and Its Relationship with Stress" (Vol.36, No.5, May, 2009) in "China Laser" introduced a test method for the polarization characteristics of semiconductor laser arrays. The polarizer is irradiated on the CCD camera, the polarizer is rotated 90°, the result is recorded, and the value of the degree of polarization is obtained. This method cannot judge the polarization mode. The polarizer cannot withstand high-power lasers, and it is difficult to test the degree of polarization of high-power semiconductor lasers.

The State Intellectual Property Office of the People's Republic of China published a patent document whose publication number is CN 1024435422A on May 2, 2012, and the name is a semiconductor laser polarization test system. The system compresses and converges the laser light of the semiconductor laser, and then separates the P and S light through the polarization beam splitting device, and places two power detectors in the P and S directions after the light splitting to detect the power. Calculate the polarization value by calculating the ratio of P and S powers.

The State Intellectual Property Office of the People's Republic of China published a patent document with the publication number CN 202255839U on May 30, 2012, titled a semiconductor laser polarization test system. The system splits the laser light of the semiconductor laser, and 95% of the light passes through the polarizer-convergence and compression, then detects the power with a photodetector and a digital multimeter, and records the maximum and minimum values of the multimeter by rotating the polarizer to calculate the polarization value; 5% The light passes through the polarization splitter prism, and two sets of photodetectors and data acquisition cards placed in the P and S directions are used to collect and compare the P and S powers to determine the main polarization mode of the laser.

Among the above two schemes, the first scheme uses two detectors to detect P and S power, and it is difficult to eliminate the error between the two detectors; the second scheme records the maximum value of the multimeter during this process by rotating the polarizer and minimum, difficult to manipulate and automate.

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide a simple and automatic semiconductor laser polarization test system, which can test and record the polarization value of the laser quickly, accurately and automatically, and can be applied to the test of large quantities of semiconductor laser products.

The notification system of the sample processing plant is to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect. The utility model is realized through the following technical solutions:

A simple and automatic semiconductor laser polarization test system, including a semiconductor laser, the output end of the semiconductor laser is sequentially provided with a combined optical path, a polarizing prism and a power detector, and the polarizing prism is driven by a belt or a gear and the motor in the rotating device is controlled by a motor connected, the motor-controlled rotating device includes the motor and a motor controller, the polarizing prism is connected to the motor controller through a limit switch, and the motor-controlled rotating device is connected to a computer respectively with the power detector.

Further, the combined optical path is formed by combining multiple sets of aspheric mirrors.

Further, the polarizing prism is a polarizing PBS cube beam splitter.

Further, the motor-controlled rotating device also includes a fixing kit. ``

The beneficial effects of the utility model are:

The utility model is simple to operate, can avoid errors between different detectors, and accurately measure the power values in the P and S directions, that is, accurately measure the power of the two laser modes of TM and TE. The correspondence of P and S splitting, that is, the accurate separation of the two modes of TM and TE of the same beam.

The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with accompanying drawings. back. The specific embodiment of the utility model is given in detail by the following examples and accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Explanation of the labels in the figure:

1. Semiconductor laser, 2. Combined optical path, 3. Polarizing prism, 4. Power detector, 5. Motor control rotating device, 6. Belt, 7. Limit switch, 8. Computer, 9. Motor, 10. Motor control device.

Detailed ways

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

See Figure 1, a simple and automated semiconductor laser polarization test system,

Comprising a semiconductor laser 1, the output end of the semiconductor laser 1 is sequentially provided with a combined optical path 2, a polarizing prism 3 and a power detector 4, and the polarizing prism 3 is connected to the motor 9 in the motor control rotating device 5 through a belt 6 or a gear transmission , the motor-controlled rotating device 5 includes the motor 9 and a motor controller 10, the polarizing prism 3 is connected to the motor controller 10 through a limit switch 7, and the motor-controlled rotating device 5 is connected to the power detection Device 4 is connected to computer 8 respectively.

Further, the combined optical path 2 is composed of multiple sets of aspheric mirrors.

Further, the polarizing prism 3 is a polarized PBS cube beam splitter, which transmits P-polarized light and reflects S-polarized light. the

Further, the motor-controlled rotating device 5 also includes a fixing kit. The switch signal generated by the limit switch 7 can stop the rotation of the motor 9, thereby precisely controlling the rotation angle of the polarizing prism 3 to be 90°.

The working process of the present utility model is:

After the light emitted by the semiconductor laser 1 passes through the combined optical path 2, the converged light beam is incident on the polarizing prism 3, and the laser light passing through the polarizing prism 3 enters the integrating sphere of the power detector 4, so The polarizing prism 3 allows the P polarized light to pass through, and the S polarized light is reflected. It can be seen that the TM mode power value collected by the integrating sphere head is rotated to 90°, and the TE and TM modes are exchanged with respect to the prism, and are collected again The integrating sphere reads to obtain the TE mode power value, the data is transmitted to the computer 8 through the data line, and the polarization value is calculated by the software on the computer 8.

The motor 9 drives the polarizing prism 3 to rotate:

The motor 9 is controlled by the motor control rotating device 5, and the polarizing prism 3 is driven to rotate by the belt 6 or gear transmission, and the 90° limit on the polarizing prism 3 and the limit switch 7 are connected. Cooperate with generating a switch signal, which can control the rotating device 5 through the motor to stop the rotation of the motor 9, thereby precisely controlling the rotation angle of the polarizing prism 3 to be 90°.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model. the

Claims (4)

1. A kind of simple and easy automation semiconductor laser polarization testing system, comprises semiconductor laser, it is characterized in that: described semiconductor laser output end is provided with combination optical path, polarizing prism and power detector successively, described polarizing prism is driven by belt or gear and motor Control the motor connection in the rotating device, the motor controlling the rotating device includes the motor and the motor controller, the polarizing prism is connected with the motor controller through a limit switch, the motor controlling the rotating device is connected with the power detection connected to the computer respectively. 2. The simple and automatic semiconductor laser polarization test system according to claim 1, characterized in that: the combined optical path is formed by combining multiple groups of aspheric mirrors. 3. The simple and automatic semiconductor laser polarization testing system according to claim 1, characterized in that: the polarizing prism is a polarizing PBS cube beam splitter. 4. The simple and automatic semiconductor laser polarization testing system according to claim 1, characterized in that: the motor-controlled rotating device also includes a fixing kit.

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