A fiber laser phase modulator based on cube corner mirror and piezoelectric ceramics

Abstract

The invention relates to the technical field of optical fiber laser phase control, and discloses an optical fiber laser phase modulator based on a cube corner and piezoelectric ceramics, comprising a base for limiting various components; a polarization-maintaining optical fiber, the polarization-maintaining optical fiber is arranged on one side of the base and is used for inputting and outputting laser; an optical fiber collimator, the optical fiber collimator is connected to the end of the polarization-maintaining optical fiber, and the optical fiber collimator is used for converting the laser emitted by the polarization-maintaining optical fiber into collimated spatial light; a piezoelectric ceramic module, the piezoelectric ceramic module is arranged on the base and is used for generating deformation displacement; a cube corner, the cube corner is arranged corresponding to the polarization-maintaining optical fiber and is used for parallel reflection of the light path; a slider, the end of the slider is connected to the piezoelectric ceramic module, and the cube corner is connected to the slider; and a control line, the control line is connected to the two poles of the piezoelectric ceramic module and is used for inputting a control voltage signal to the piezoelectric ceramic.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber laser phase control, and in particular to an optical fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics. Background Art

[0002] At present, the common fiber laser phase modulation devices are mainly lithium niobate electro-optic phase modulator and piezoelectric ceramic phase modulator. Among them, the lithium niobate electro-optic phase modulator uses the electro-optic effect to change the refractive index of the crystal, thereby achieving the control of the light phase, and the piezoelectric ceramic phase modulator uses the inverse piezoelectric effect of the piezoelectric ceramic material to push the optical fiber coiled on it, change the length of the optical fiber to achieve the control of the light phase. Both phase modulation devices have been fully verified in experiments, but they also have certain defects. Among them, the lithium niobate electro-optic phase modulator has a large insertion loss and a low damage threshold, which leads to the need for multi-stage amplification in the design of the light source part, increasing the complexity and instability of the system. The piezoelectric ceramic phase modulator has a long coiled optical fiber, high cost and assembly difficulty, and poor stability. In addition, the tightly coiled optical fiber will oscillate when reset, the reset time is long, and the application occasions are relatively few. To this end, the present invention proposes a fiber laser phase modulation device based on a corner cube and a series piezoelectric ceramic group. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics.

[0004] The technical solution of the present invention is: a fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics, comprising:

[0005] Base, used to limit the positions of various components;

[0006] A polarization-maintaining optical fiber, which is arranged on one side of the base and is used for input and output of laser light;

[0007] An optical fiber collimator, the optical fiber collimator is connected to the end of the polarization-maintaining optical fiber, and the optical fiber collimator is used to convert the laser emitted by the polarization-maintaining optical fiber into collimated spatial light;

[0008] A piezoelectric ceramic module, which is arranged on the base and is used to generate deformation displacement;

[0009] A corner cube, the corner cube is arranged corresponding to the polarization-maintaining optical fiber and is used for parallel reflection of the light path;

[0010] A slider, an end of which is connected to the piezoelectric ceramic module, and the corner cube is connected to the slider;

[0011] A control line, wherein the control line is connected to two poles of the piezoelectric ceramic module and is used to input a control voltage signal to the piezoelectric ceramic module.

[0012] It can be seen from the above scheme that the control line is used to input a control voltage signal to the piezoelectric ceramic module, thereby driving the piezoelectric ceramic to deform and displace. The present invention uses the displacement deformation of the piezoelectric ceramic to move the corner cube on the slider, thereby changing the length of the internal free space optical path to change the laser phase. The modulator provided by the present invention has the advantages of compact overall structure, convenient assembly, low cost, low insertion loss, fast reset, etc.

[0013] The piezoelectric ceramic module includes a second piezoelectric ceramic. The prism is arranged on the slider through a prism fixing member. One end of the second piezoelectric ceramic is connected to the slider, and the other end is fixedly connected to the base. A first slot is arranged on the base, and the slider is slidably fitted in the first slot.

[0014] The piezoelectric ceramic module also includes a first piezoelectric ceramic, one end of which is fixedly connected to the inner side of the slider, and the other end is connected to the prism fixture. A second slot is provided on the slider, and the prism fixture is slidably fitted in the second slot.

[0015] The negative electrode of the first piezoelectric ceramic is connected to the positive electrode of the second piezoelectric ceramic and connected to the negative electrode of the external input voltage, the positive electrode of the first piezoelectric ceramic is connected to the negative electrode of the first diode, the negative electrode of the second piezoelectric ceramic is connected to the positive electrode of the second diode, and the positive electrode of the first diode is connected to the negative electrode of the second diode and connected to the positive electrode of the external input voltage. It can be seen that by connecting the first piezoelectric ceramic and the second piezoelectric ceramic in series and then combining the diode to realize voltage drive control, the modulator can work normally regardless of whether the control voltage is positive or negative, and the corner cube moves in two opposite directions under positive and negative pressures, respectively, which makes it more convenient to control the laser phase and improves the safety performance of the device.

[0016] The first piezoelectric ceramic and the second piezoelectric ceramic both include a plurality of stacked piezoelectric ceramic sheets, and the adjacent piezoelectric ceramic sheets are bonded and connected by epoxy resin. It can be seen that the piezoelectric ceramic module can achieve a larger stroke and output while maintaining a faster response speed.

[0017] A glass sleeve is arranged between the optical fiber collimator and the base, which can be used to protect the optical fiber collimator and assist in the installation and adjustment of the optical fiber collimator.

[0018] The corner cube fixing piece is provided with a through hole, and the corner cube is adapted to be installed in the through hole. It can be seen that the corner cube is fixed by the through hole.

[0019] The base is buckled with a shell, which includes a sleeve and a cover, the cover is provided with a through slot corresponding to the polarization-maintaining optical fiber, and the sleeve is provided with a wire hole corresponding to the control wire. It can be seen that the shell is buckled on the base to isolate and protect various internal components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of another embodiment of the present invention;

[0022] Figure 3 is a control schematic diagram of a piezoelectric ceramic module according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the shell structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the optical path of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] like Figures 1 to 5As shown, the present invention is a fiber laser phase modulator based on a corner cube and piezoelectric ceramics, a base 101, used to limit various components; an optical fiber module, the optical fiber module includes two polarization-maintaining optical fibers 109 arranged on the side of the base 101, used for laser input and output; an optical fiber collimator 104, the optical fiber collimator 104 is correspondingly connected to the ends of the two polarization-maintaining optical fibers 109, the optical fiber collimator 104 is used to convert the laser emitted by the polarization-maintaining optical fibers 109 into collimated spatial light, a glass sleeve 105 is arranged between the optical fiber collimator 104 and the base 101, the optical fiber collimator 104 and the glass sleeve 105 are fixed together with glue, and the front end is fused to the polarization-maintaining optical fiber 109. When fixing the optical fiber collimator 104, it is necessary to use a matching adjustment tool to fine-tune the spatial positions of the two optical fiber collimators 104, so that the laser incident through one of the collimators can be received by the other collimator after being reflected by the corner mirror 107, and at the same time ensure that the polarization state of the laser remains unchanged during the propagation process; a piezoelectric ceramic module, the piezoelectric ceramic module is arranged on the base 101, and is used to generate deformation displacement; a corner mirror 107, the corner mirror 107 is arranged corresponding to the polarization-maintaining optical fiber 109, and is used to parallelize the light path. During assembly, the corner mirror 107 needs to be rotated so that one of the edges is in a vertical direction; a slider 102, the end of the slider 102 is connected to the piezoelectric ceramic module, the corner mirror 107 is connected to the slider 102, and the slider as a whole is a U-shaped structure; a control line 110, the control line 110 is connected to the two poles of the piezoelectric ceramic module, and is used to input a control voltage signal to the piezoelectric ceramic module.

[0027] like Figure 2In one embodiment shown, the piezoelectric ceramic module includes a second piezoelectric ceramic 108, the prism 107 is arranged on the slider 102 through a prism fixing member 103, one end of the second piezoelectric ceramic 108 is connected to the slider 102, and the other end is fixedly connected to the base 101, and a first slot is provided on the base 101, and the prism fixing member 103 is slidably fitted in the first slot. The laser is input from a polarization-maintaining optical fiber 109, and becomes a collimated light beam after passing through the optical fiber collimator 104 and is transmitted to the free space. After being transmitted to the corner mirror 107, it is reflected three times and finally emitted in parallel with the initial incident light. The light beam is captured by another optical fiber collimator 104 and coupled to the output of another polarization-maintaining optical fiber 109. When the control voltage is applied to the second piezoelectric ceramic 108, the deformation displacement generated is transmitted to the corner mirror fixture 103, so that the corner mirror fixture 103 slides in the first slot of the base 101 with the corner mirror 107, and the optical path of the laser transmitted in the free space changes, thereby changing the laser phase. By continuously adjusting the amplitude, frequency and other parameters of the control voltage signal, the real-time and rapid regulation of the laser phase can be achieved, and the phase noise caused by environmental interference such as external vibration can be compensated.

[0028] like Figure 1In another embodiment shown, the piezoelectric ceramic module includes a first piezoelectric ceramic 106 and a second piezoelectric ceramic 108. The first piezoelectric ceramic 106 and the second piezoelectric ceramic 108 each include a plurality of stacked piezoelectric ceramic sheets, and the adjacent piezoelectric ceramic sheets are bonded and connected by epoxy resin. One end of the first piezoelectric ceramic 106 is fixedly connected to the inner side of the slider 102, and the other end is connected to the prism fixture 103. The slider 102 is provided with a second slot, and the prism fixture 103 is slidably fitted in the second slot, and the prism fixture 103 can move in a small range in the slot. The negative electrode of the first piezoelectric ceramic 106 is connected to the positive electrode of the second piezoelectric ceramic 108 and connected to the negative electrode of the external input voltage, the positive electrode of the first piezoelectric ceramic 106 is connected to the negative electrode of the first diode 111, the negative electrode of the second piezoelectric ceramic is connected to the positive electrode of the second diode 112, and the positive electrode of the first diode 111 is connected to the negative electrode of the second diode 112 and connected to the positive electrode of the external input voltage. The control line 110 is used to input a control voltage signal to the piezoelectric ceramic. The two control lines 110 are respectively welded to the two poles of the piezoelectric ceramic module. When the voltage difference between the two control lines 110 is 0~U (U is determined by the piezoelectric ceramic model, usually 75V or 150V, so it needs to be used with a voltage amplifier), the piezoelectric ceramic produces a corresponding deformation displacement. Under the above-mentioned connection mode of the series piezoelectric ceramic group, the external voltage input can be a positive voltage or a negative voltage, and there is no risk of damaging the piezoelectric ceramic. The positive and negative voltage inputs correspond to an increase in the optical path and a decrease in the optical path, respectively. The control of the laser phase is more convenient and simple, and the overall device has a higher safety performance.

[0029] When the external input voltage is positive, the first diode 111 is turned on and the second diode 112 is turned off. At this time, the first piezoelectric ceramic 106 works normally and the second piezoelectric ceramic 108 does not work. The deformation displacement of the first piezoelectric ceramic 106 is transmitted to the prism fixture 103, so that the prism fixture 103 and the prism 107 move to the right together, and the laser optical path in the free space increases.

[0030] When the external input voltage is negative, the first diode 111 is turned off and the second diode 112 is turned on. At this time, the first piezoelectric ceramic 106 does not work, and the second piezoelectric ceramic 108 works normally. The deformation displacement of the second piezoelectric ceramic 108 is transmitted to the slider 102, so that the slider 102, the prism fixture 103, and the prism 107 move to the left together, and the laser optical path in the free space is reduced.

[0031] The control line 110 is used to input a control voltage signal to the piezoelectric ceramic. The two control lines are respectively welded to the two poles of the piezoelectric ceramic. When the voltage difference between the two control lines is 0~U (U is determined by the piezoelectric ceramic model, usually 75V or 150V, so it needs to be used with a voltage amplifier), the piezoelectric ceramic produces a corresponding deformation displacement. In the above connection mode of the series piezoelectric ceramic group, the external input voltage can be a positive voltage or a negative voltage, and there is no risk of damaging the piezoelectric ceramic.

[0032] The corner cube fixing member 103 is provided with a through hole, and the corner cube 107 is adapted to be installed in the through hole. The base 101 is buckled with a shell 113, and the shell 113 is used to protect the internal components. The shell 113 includes a casing 1131 and a cover 1132. The cover 1132 is provided with a through groove 1133 corresponding to the polarization-maintaining optical fiber 109. The casing 1131 is provided with a wire hole 1134 corresponding to the control line 110, so that the control voltage can be directly applied from the outside of the modulator and the laser can be sent and received. The base 101 is provided with four threaded holes at the bottom for fixing the shell 113.

[0033] In summary, the present invention proposes a fiber laser phase modulation device based on a prism and a piezoelectric ceramic group, which drives the prism through the displacement deformation of the piezoelectric ceramic, changes the length of the internal free space optical path to change the laser phase, and has the advantages of low insertion loss, fast response speed, low cost, compact structure, etc. In addition, the connection method of the series piezoelectric ceramic group makes it possible to avoid the risk of damaging the piezoelectric ceramic regardless of whether the external input voltage is positive or negative, and the positive and negative voltage inputs correspond to an increase in the optical path and a decrease in the optical path, respectively, making the control of the laser phase more convenient and concise, and the overall device has a higher safety performance, providing a new idea for the current relatively monotonous fiber laser phase modulation devices.

[0034] Finally, it should be emphasized that the above-mentioned embodiments only express several implementation methods of the present application, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of this application shall be based on the attached claims.

Claims

1. A fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics, characterized in that: include: A base (101) is used to limit the positions of various components; An optical fiber module, the optical fiber module comprising two polarization-maintaining optical fibers (109) arranged on the side of the base (101) and used for input and output of laser light; An optical fiber collimator (104), the optical fiber collimator (104) being connected to the ends of the two polarization-maintaining optical fibers (109) respectively, and the optical fiber collimator (104) being used to convert laser light emitted by the polarization-maintaining optical fibers (109) into collimated spatial light; A piezoelectric ceramic module, the piezoelectric ceramic module being arranged on the base (101) and being used to generate deformation displacement; A conic mirror (107), the conic mirror (107) being arranged corresponding to the polarization-maintaining optical fiber (109) and used for performing parallel reflection on the light path; A slider (102), the end of the slider (102) being connected to the piezoelectric ceramic module, and the prism (107) being connected to the slider (102); A control line (110), the control line (110) being connected to the two poles of the piezoelectric ceramic module and being used for inputting a control voltage signal to the piezoelectric ceramic module, the piezoelectric ceramic module comprising a second piezoelectric ceramic (108), the prism (107) being arranged on the slider (102) via a prism fixing member (103), one end of the second piezoelectric ceramic (108) being connected to the slider (102) and the other end being fixedly connected to the base (101), the base (101) being provided with a first slot, the slider (102) being slidably fitted in the first slot, the piezoelectric ceramic module further comprising a first piezoelectric ceramic (106), one end of the first piezoelectric ceramic (106) being fixedly ... connected to the inner side of the slider (102), and the other end is connected to the prism fixture (103), the slider (102) is provided with a second slot, the prism fixture (103) is slidably fitted in the second slot, the cathode of the first piezoelectric ceramic (106) is connected to the anode of the second piezoelectric ceramic (108) and connected to the cathode of an external input voltage, the anode of the first piezoelectric ceramic (106) is connected to the cathode of a first diode (111), the cathode of the second piezoelectric ceramic (108) is connected to the anode of a second diode (112), the anode of the first diode (111) is connected to the cathode of the second diode (112) and connected to the cathode of an external input voltage; When the external input voltage is a positive voltage, the first diode (111) is turned on and the second diode (112) is turned off. At this time, the first piezoelectric ceramic (106) works normally and the second piezoelectric ceramic (108) does not work. The deformation displacement of the first piezoelectric ceramic (106) is transmitted to the corner mirror fixing part (103), so that the corner mirror fixing part (103) and the corner mirror (107) move to the right together, and the laser optical path in the free space increases. When the external input voltage is a negative voltage, the first diode (111) is turned off and the second diode (112) is turned on. At this time, the first piezoelectric ceramic (106) does not work and the second piezoelectric ceramic (108) works normally. The deformation displacement of the second piezoelectric ceramic (108) is transmitted to the slider (102), so that the slider (102) and the corner mirror fixing part (103) and the corner mirror (107) move to the left together, and the laser optical path in the free space decreases.

2. The optical fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics according to claim 1, characterized in that: The first piezoelectric ceramic (106) and the second piezoelectric ceramic (108) both comprise a plurality of piezoelectric ceramic sheets stacked together, and adjacent piezoelectric ceramic sheets are bonded and connected by epoxy resin.

3. The optical fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics according to claim 1, characterized in that: A glass sleeve (105) is provided between the optical fiber collimator (104) and the base (101).

4. The optical fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics according to claim 1, characterized in that: The prism fixing piece (103) is provided with a through hole, and the prism (107) is adapted to be installed in the through hole.

5. The optical fiber laser phase modulator based on a cube corner mirror and piezoelectric ceramics according to claim 1, characterized in that: The base (101) is buckled with a housing (113) externally mounted thereon, the housing (113) comprising a casing (1131) and a cover (1132), the cover (1132) being provided with a through slot (1133) corresponding to the polarization-maintaining optical fiber (109), and the casing (1131) being provided with a wire hole (1134) corresponding to the control wire (110).

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