阅读说明：本技术 一种具有光栅的垂直腔面激光器的光调制装置及方法 (Optical modulation device and method of vertical cavity surface laser with grating ) 是由 江孝伟 毛建辉 方晓敏 于 2019-09-09 设计创作，主要内容包括：本发明提供了一种具有光栅的垂直腔面激光器的光调制装置及方法,实时监测激光器工作时输出光束的偏振状态和波长,并通过计算机实时补偿和调制激光光束的偏振状态以及波长,有效的实现了对激光光束的调制,确保激光器输出光束工作稳定和质量,可以有效解决激光器输出光束由于工作环境温度的变化、气流和振动的影响导致激光的偏振、波长变化的问题。(The invention provides a light modulation device and a light modulation method of a vertical cavity surface laser with a grating, which can monitor the polarization state and the wavelength of an output light beam of the laser in real time when the laser works, compensate and modulate the polarization state and the wavelength of the laser light beam in real time through a computer, effectively realize the modulation of the laser light beam, ensure the working stability and the quality of the output light beam of the laser, and effectively solve the problem that the polarization and the wavelength of the laser are changed due to the change of the working environment temperature and the influence of air flow and vibration of the output light beam of the laser.)

1. A light modulation device of a vertical cavity surface laser with a grating comprises a vertical cavity surface laser, an electromechanical grating, a polarization compensation component and a computer, wherein the computer is respectively connected with the vertical cavity surface laser, the electromechanical grating and the polarization compensation component; the method is characterized in that:

the vertical cavity surface laser is used for outputting a laser beam with a single wavelength;

The electromechanical grating is used for modulating electromechanical beams according to requirements;

The polarization compensation component is used for dynamically compensating the polarization state of the laser beam according to the instruction of the computer;

The computer is used for controlling the running states of the vertical cavity surface laser, the electromechanical grating and the polarization compensation assembly, controlling the polarization compensation assembly to dynamically compensate the real-time polarization state Pt of the laser beam by executing a polarization compensation instruction, stabilizing the polarization state of the compensated laser beam in an initial polarization state P0, and adjusting the output power of the laser by executing a wavelength adjusting instruction so as to change the wavelength lambda t of the laser beam and enable the wavelength lambda t to be equal to the initial wavelength lambda 0.

2. A light modulation device according to claim 1 wherein the laser beam has an initial wavelength of 980nm, 1331nm or 1550 nm.

3. A light modulation device as claimed in claim 1 wherein the polarization compensation component is preferably a Berek polarization compensator.

4. A light modulation method of a vertical cavity surface laser with a grating is characterized by comprising the following steps:

S1, acquiring an initial polarization state P0 and an initial wavelength lambda 0 of the output beam of the vertical cavity surface laser;

S2, acquiring the real-time polarization state Pt of the laser beam and the wavelength lambda t of the laser beam of the vertical cavity surface laser with the electromechanical grating for the continuous working time t, and respectively acquiring a mapping relation table based on the working time t and the polarization state Pt and a mapping relation table based on the working time t and the wavelength lambda t;

S3, obtaining a polarization compensation instruction according to the working time t based on the initial polarization state P0 and a mapping relation table of the working time t of the laser and the polarization state Pt; obtaining a wavelength adjusting instruction according to the working time t according to the mapping relation table of the initial wavelength lambda 0 and the working time t with the wavelength lambda t;

S4, calling the polarization compensation program to control the polarization compensation component to dynamically compensate the real-time polarization state Pt of the laser beam, and stabilizing the polarization state of the compensated laser beam at P0;

and S5, calling the wavelength adjusting command to dynamically adjust the wavelength lambdat of the laser beam output by the laser to be equal to the initial wavelength lambada 0.

S6, repeating steps S3-S5, so that the laser beam is stabilized at Pt ═ P0, and λ t ═ λ 0.

5. The light modulation method according to claim 4, wherein the step S1 is to obtain the initial polarization state P0 and the initial wavelength λ 0 of the output beam of the VCSEL, and specifically: the initial polarization state P0 and the initial wavelength λ 0 of the output beam of the vertical cavity surface laser are measured by a laser polarization tester and a wavelength tester, respectively.

6. The light modulation method according to claim 4, wherein the initial polarization state P0 and the real-time polarization state Pt are specifically an initial polarization degree and a real-time polarization degree.

7. A light modulation method according to claim 4 wherein the polarization compensation component is preferably a Berek polarization compensator.

8. The light modulation method according to claim 7, wherein the polarization compensation instructions are Berek polarization compensator adjustment instructions for controlling a Berek polarization compensator to modify the real-time polarization state Pt to an initial polarization state P0.

9. The optical modulation method according to claim 4, wherein the wavelength adjustment instruction is specifically: the operating instruction to adjust the real-time output power Et of the laser to equal the initial output power E0 of the laser.

Technical Field

the invention belongs to the technical field of optical modulators, and particularly relates to an optical modulation device and method of a vertical cavity surface laser with a grating.

background

The Vertical Cavity Surface Laser (VCSEL) has the characteristics of high power, single longitudinal mode, circular light spot output, long service life, easy two-dimensional integration and the like, so that the commercial application of the Vertical Cavity Surface Laser is more and more extensive, especially in the fields of telecommunications, Laser display, Laser ignition, pump sources, Laser processing and the like. Among them, single-wavelength vertical cavity surface lasers with wavelengths of 850nm, 980nm, 1310nm, 1550nm, etc., have been widely studied by researchers with their excellent performance.

In a precise spectrum experiment, laser with stable frequency is needed, and the long-term drift of the laser is large due to the change of laboratory temperature and the influence of air flow and vibration when the laser runs freely, so that the polarization and the wavelength of the laser emitted by the laser are affected to different degrees, and therefore the polarization state and the wavelength of the laser need to be compensated, and the stability after the laser is output is ensured.

disclosure of Invention

the invention aims to provide a light modulation device and a light modulation method for a vertical cavity surface laser with a grating, which can effectively solve the problem that the polarization and wavelength of laser light are changed due to the influence of the change of the temperature of a working environment and the influence of air flow and vibration of the output light beam of the laser, and provide the light modulation device and the light modulation method for dynamically compensating the polarization state of the laser light beam and filtering stray light, so that the light beam of the vertical cavity surface laser can be stably output.

The purpose of the invention is realized by the following technical scheme:

A light modulation method of a vertical cavity surface laser with a grating comprises the following steps:

s1, acquiring an initial polarization state P0 and an initial wavelength lambda 0 of the output beam of the vertical cavity surface laser;

S2, acquiring the real-time polarization state Pt of the laser beam and the wavelength lambda t of the laser beam of the vertical cavity surface laser with the electromechanical grating for the continuous working time t, and respectively acquiring a mapping relation table based on the working time t and the polarization state Pt and a mapping relation table based on the working time t and the wavelength lambda t;

S3, obtaining a polarization compensation adjustment instruction according to the working time t based on the initial polarization state P0 and a mapping relation table of the working time t of the laser and the polarization state Pt; obtaining a wavelength adjusting instruction according to the working time t according to the mapping relation table of the initial wavelength lambda 0 and the working time t with the wavelength lambda t;

S4, controlling a polarization compensation component to dynamically compensate the real-time polarization state Pt of the laser beam by calling the polarization compensation adjustment program, and stabilizing the polarization state of the compensated laser beam at P0;

and S5, dynamically adjusting the wavelength lambda t of the laser beam output by the laser by calling the wavelength adjusting instruction to be equal to the initial wavelength lambda 0.

S6, repeating steps S3-S5, so that the laser beam is stabilized at Pt ═ P0, and λ t ═ λ 0.

further, obtaining an initial polarization state P0 and an initial wavelength λ 0 of the output beam of the vertical cavity surface laser includes: the initial polarization state P0 and the initial wavelength λ 0 of the output beam of the vertical cavity surface laser are measured by a laser polarization tester and a wavelength tester, respectively.

Further, the initial polarization state P0 and the real-time polarization state Pt may be degrees of polarization.

Further, in step S4, the step of dynamically compensating the real-time polarization state Pt of the laser beam by calling the polarization compensation adjustment program to control the polarization compensation component specifically includes: and the computer runs the polarization compensation adjusting program to control the polarization compensation assembly to dynamically adjust the polarization state of the laser beam in real time so as to ensure that the real-time polarization state Pt of the laser beam is stabilized in the polarization state P0.

further, in step S5, the wavelength λ t of the laser beam output by the laser is dynamically adjusted to be equal to the initial wavelength λ 0 by invoking the wavelength adjustment command. The method specifically comprises the following steps: and operating a wavelength adjusting instruction through a computer to adjust the output power of the laser so as to change the wavelength lambda t of the laser beam to be equal to the initial wavelength lambda 0.

the invention further provides an optical modulation device of the vertical cavity surface laser with the grating, which comprises the vertical cavity surface laser, the electromechanical grating, the polarization compensation component, a computer, a reflector and a lens, wherein the computer is respectively connected with the vertical cavity surface laser, the electromechanical grating and the polarization compensation component.

The vertical cavity surface laser is used for outputting laser beams with single wavelength.

The electromechanical grating is used for modulating electromechanical beams according to requirements.

And the polarization compensation component is used for dynamically compensating the polarization state of the laser beam according to the instruction of the computer.

And the computer is used for controlling the running states of the vertical cavity surface laser, the electromechanical grating and the polarization compensation component.

The invention has the advantages that:

The invention effectively realizes the modulation of the laser beam and ensures the working stability and quality of the laser output beam by monitoring the polarization state and wavelength of the output beam when the laser works in real time and compensating and modulating the polarization state and wavelength of the laser beam in real time through the computer.

drawings

FIG. 1 is a flow chart of the method of the present invention;

Fig. 2 is a schematic diagram of the system structure of the invention.

Detailed Description

The present invention is described in further detail below with reference to FIGS. 1-2.