CN111965853A - Spatial optical phase modulator - Google Patents

Spatial optical phase modulator Download PDF

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Publication number
CN111965853A
CN111965853A CN202011007475.5A CN202011007475A CN111965853A CN 111965853 A CN111965853 A CN 111965853A CN 202011007475 A CN202011007475 A CN 202011007475A CN 111965853 A CN111965853 A CN 111965853A
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CN
China
Prior art keywords
wedge
mirror
shaped mirror
phase modulator
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011007475.5A
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Chinese (zh)
Inventor
粟荣涛
龙金虎
汪进
常洪祥
马鹏飞
马阎星
周朴
司磊
许晓军
陈金宝
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National University of Defense Technology
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National University of Defense Technology
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Application filed by National University of Defense Technology filed Critical National University of Defense Technology
Priority to CN202011007475.5A priority Critical patent/CN111965853A/en
Publication of CN111965853A publication Critical patent/CN111965853A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/035—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect in an optical waveguide structure

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

In order to overcome the defects that an existing phase modulator is low in damage-resistant threshold value, small in linear response interval, difficult to flexibly apply to a spatial light path and the like, the invention provides a spatial light phase modulator which comprises a double-wedge-shaped mirror, wherein the double-wedge-shaped mirror comprises a first wedge-shaped mirror and a second wedge-shaped mirror, wedge surfaces of the first wedge-shaped mirror and the second wedge-shaped mirror are vertically arranged oppositely, the first wedge-shaped mirror and the second wedge-shaped mirror are vertically supported by a first supporting structure and a second supporting structure respectively, at least one supporting mechanism in the first supporting structure and the second supporting structure can achieve telescopic adjustment in the vertical direction under the control of a controller, the vertical relative positions of the first wedge-shaped mirror and the second wedge-shaped mirror are changed, and then the phase of a transmission or reflection laser piston passing through the double wedge-shaped mirror is adjusted. The invention has the advantages of high damage-resistant threshold, low insertion loss, wide linear response interval and flexible application.

Description

Spatial optical phase modulator
Technical Field
The invention relates to the technical field of light beam control devices in optics, in particular to a phase modulator under a precise structure.
Background
The fiber laser coherent synthesis technology based on the main oscillation power amplification structure can improve the laser power and simultaneously keep good beam quality, and is one of effective ways for breaking through the limitation of single-path laser power. Through mature active and passive phase locking technology, the phase modulator can be used for realizing effective control of the phase of the array laser piston, and an effective coherent synthesis effect is achieved.
With the improvement of the manufacturing process of components, the control rate of the electro-optic phase modulator based on the lithium niobate crystal can reach GHz level, and the guarantee is provided for realizing rapid phase control. However, limited by the damage threshold of the crystal, the lithium niobate electro-optical phase modulator only allows operation at low power, and when high-power fiber laser is coherently synthesized, staged amplification has to be performed, which not only increases the complexity and power loss of the system structure, but also reduces the stability of the system. Meanwhile, in the application of a spatial light path, the lithium niobate phase modulator must be coupled with an optical fiber, so that the flexible regulation and control of the lithium niobate phase modulator in the spatial light path are limited, and the wavelength modulation range is limited, so that the lithium niobate phase modulator is not beneficial to wavelength expansion.
Because the piezoelectric ceramic has an electrically controllable vibration mode, with the improvement of manufacturing technology, the response frequency can reach hundreds of KHz magnitude, and if the piezoelectric ceramic is applied to the field of spatial optical phase modulation, the piezoelectric ceramic can probably become a novel phase modulation method. At present, piezoelectric ceramics have been widely applied in the field of adaptive optical fiber collimators, and scientific researchers have combined the piezoelectric ceramics with optical fibers to realize an optical fiber phase modulator driven by the piezoelectric ceramics, so as to provide a novel method for laser piston phase control. The existing PZT phase modulator utilizes the inverse piezoelectric effect of a piezoceramic material to change the length of an optical fiber, thereby achieving the purpose of changing the optical path and having the advantages of high optical damage threshold, low insertion loss and the like.
However, the frequency response range of the piezoelectric ceramic is small, only about tens of kHz, and along with the increase of modulation frequency, the frequency response curve starts to change violently, so that the piezoelectric ceramic can only be in a linear response area in a small range in practical application; meanwhile, the optical fiber is relied on, so that the range of the modulated laser wavelength is narrow, flexible phase regulation and control are not convenient on a spatial light path, and application expansion is severely limited.
Therefore, the phase modulator which has the advantages of high damage threshold, low insertion loss, wide linear response interval, realization of phase modulation of any wavelength and convenient application to the field of space optical paths has important application value.
Disclosure of Invention
The invention provides a spatial optical phase modulator, aiming at overcoming the defects of low damage resistance threshold value, small linear response interval, difficult flexible application to a spatial light path and the like of the conventional phase modulator.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
spatial light phase modulator, including two wedge mirrors, two wedge mirrors comprise first wedge mirror and second wedge mirror, the vertical relative setting of wedge face of first wedge mirror and second wedge mirror, first wedge mirror and second wedge mirror are respectively by the vertical support of first bearing structure and second bearing structure, at least one supporting mechanism can realize the flexible regulation of vertical direction under the control of controller in first bearing structure and the second bearing structure, change the vertical relative position of first wedge mirror and second wedge mirror, and then realize the regulation and control of transmission or reflection laser piston phase place through two wedge mirrors.
As a preferable scheme of the present invention, the first support structure can achieve telescopic adjustment in the vertical direction, so as to drive the first wedge-shaped mirror on the first support structure to synchronously displace in the vertical direction, and change the vertical relative position of the first wedge-shaped mirror and the second wedge-shaped mirror.
There are many ways to achieve vertical telescopic adjustment of the support mechanism, such as motor drive, pneumatic drive, etc. However, considering that the optical device needs to be controlled precisely, the preferred proposal of the invention is as follows: the first support structure comprises a flexible hinge structure body, piezoelectric ceramics and a piezoelectric ceramic controller, the first wedge-shaped mirror is vertically supported on the flexible hinge structure body, the flexible hinge structure body is connected with the piezoelectric ceramics, and the piezoelectric ceramics are connected with the piezoelectric ceramic controller in a control mode. The displacement of the piezoelectric ceramic is controlled through the piezoelectric ceramic controller, the piezoelectric ceramic pushes the flexible hinge structure body to generate a moment in the vertical direction, the first wedge-shaped mirror is caused to displace in the vertical direction, the vertical relative position of the first wedge-shaped mirror and the second wedge-shaped mirror is changed, and then the real-time regulation and control of the phase of the transmission or reflection laser piston of the double wedge-shaped mirrors are achieved.
As a preferable scheme of the present invention, the optical device further includes an encapsulation housing, and the first wedge mirror, the second wedge mirror, the first support structure, and the second support structure are all encapsulated in the encapsulation housing. And the corresponding position of the packaging shell is provided with an incident window for the incident of the laser to the double wedge-shaped mirror and an emergent window for the emergent of the laser. The packaging shell is used for packaging and integrating the space optical phase modulator and can protect internal optical devices and the like.
The packaging shell is supported by the shell supporting rod, and the bottom of the shell supporting rod is connected with the supporting base. The shell supporting rod supports the whole packaging shell at a certain height, so that the space optical phase modulator can be conveniently applied to a space optical path. The supporting base is convenient for fixing the whole space optical phase modulator on the experiment table. Further, the support base is generally a magnetic base or other fixed base convenient for practical use.
In a preferred embodiment of the present invention, the first wedge-shaped mirror is a high lens, and the second wedge-shaped mirror is a high-reflection mirror or a high lens. The high reflectance mirror has a reflectance of 99% or more. The high lens has a transmittance of greater than or equal to 99%.
The invention has the following beneficial effects:
the laser is collimated and enters the double wedge-shaped mirror. At least one wedge-shaped mirror in the double wedge-shaped mirrors is controlled by the controller to realize displacement in the vertical direction, the vertical relative position of the two wedge-shaped mirrors in the double wedge-shaped mirrors is changed, and then the phase of the transmission or reflection laser piston passing through the double wedge-shaped mirrors is regulated and controlled.
Preferably, the piezoelectric ceramic is controlled to generate small displacement in the horizontal direction, the flexible hinge is pushed to generate moment in the vertical direction, and the moment is transmitted through the flexible hinge structure to cause the first wedge-shaped mirror to be displaced in the vertical direction, so that flexible regulation and control of the phase of the transmission or reflection laser piston are realized. Because the quartz glass has larger potential on high damage-resistant threshold value, and the phase modulator can be flexibly applied to a space optical path, the invention can better meet the application requirements of high-power fiber laser coherent synthesis and space optical phase modulation in other fields.
The invention has the advantages of high damage-resistant threshold, low insertion loss, wide linear response interval and flexible application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a front view of embodiment 1.
FIG. 2 is a side view of example 1.
FIG. 3 is a front view of embodiment 2.
FIG. 4 is a side view of example 2.
The reference numbers in the figures illustrate:
101. a double wedge mirror; 101a, a first wedge mirror; 101b, a second wedge mirror; 102. a flexible hinge structure; 103. piezoelectric ceramics; 104. a package housing; 105. a piezoelectric ceramic controller; 106. a housing support bar; 107. a support base; 108. a second support structure; 109. and (4) laser.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 1 and 2, the present embodiment provides a spatial optical phase modulator, which is a piezoelectric ceramic driven spatial optical phase modulator based on a flexible hinge structure, and includes a double wedge mirror 101, a flexible hinge structure 102, a piezoelectric ceramic 103, a package housing 104, a piezoelectric ceramic controller 105, a housing support rod 106, a support base 107, and a second support structure 108. The double wedge mirror 101 is composed of a first wedge mirror 101a and a second wedge mirror 101 b.
The first wedge mirror 101a and the second wedge mirror 101b are vertically supported by the first support structure and the second support structure 108, respectively, and wedge faces of the first wedge mirror 101a and the second wedge mirror 101b are vertically disposed symmetrically with respect to each other. The first wedge-shaped mirror 101a and the second wedge-shaped mirror 101b are both high lenses, the transmissivity of the high lenses is greater than or equal to 99%, and an antireflection film is plated at the same time. Specifically, the planes of the first wedge-shaped mirror 101a and the second wedge-shaped mirror 101b are both antireflection films; the wedge surface of the first wedge-shaped mirror 101a is an antireflection film, the wedge surface of the second wedge-shaped mirror 101b is generally an antireflection film, and the wedge surface can also be an antireflection film in some application scenarios.
In this embodiment, the first support structure can realize the telescopic adjustment in the vertical direction, and further drives the first wedge mirror 101a on the first support structure to synchronously displace in the vertical direction, and changes the vertical relative position of the first wedge mirror 101a and the second wedge mirror 101 b.
The first support structure comprises a flexible hinge structure body 102, piezoelectric ceramics 103 and a piezoelectric ceramic controller 105, wherein the first wedge-shaped mirror 101a is vertically supported on the flexible hinge structure body 102, the flexible hinge structure body 102 is connected with the piezoelectric ceramics 103, and the piezoelectric ceramics 103 is in control connection with the piezoelectric ceramic controller 105. The displacement of the piezoelectric ceramic 103 is controlled by the piezoelectric ceramic controller 105, the piezoelectric ceramic 103 pushes the flexible hinge structure 102 to generate a moment in the vertical direction, so that the first wedge-shaped mirror 101a is caused to displace in the vertical direction, the vertical relative positions of the first wedge-shaped mirror 101a and the second wedge-shaped mirror 101b are changed, and the real-time regulation and control of the phase of the transmission laser piston passing through the double wedge-shaped mirrors are further realized.
And the flexible hinge structural body is used for providing support for the first wedge-shaped mirror 101a and is connected with the piezoelectric ceramic 103, so that quick response to micro displacement is realized. In this embodiment, piezoceramics 103 level sets up, and flexible hinge structure 102 includes vertical supporting seat and left and right support arm, and first wedge mirror 101a sets up on the up end of vertical supporting seat, and the base left and right sides symmetry of vertical supporting seat is provided with left and right support arm, and the other end of left and right support arm connects the left and right ends of piezoceramics 103 respectively. The piezoelectric ceramic controller 105 controls the piezoelectric ceramic 103 to generate a small displacement in the horizontal direction, pushes the left and right support arms of the flexible hinge structure 102 to generate a moment in the vertical direction, and causes the first wedge-shaped mirror 101a to generate a displacement in the vertical direction through the moment transmission of the flexible hinge structure, thereby realizing flexible regulation and control of the piston phase of the transmission laser 109. The flexible hinge structure converts the horizontal displacement of the piezoelectric ceramic into the vertical displacement of the first wedge mirror 101 a.
The second support structure can be the same as the first support structure in structure and is designed into a telescopic structure capable of realizing displacement regulation in the vertical direction. The second support structure can also be designed as a fixed support structure, which does not require displacement regulation in the vertical direction. In this embodiment, the second support structure is a fixed support structure, specifically, the second support structure is a vertical support rod, and the second wedge mirror 101b is supported by the vertical support rod.
The first wedge mirror 101a, the second wedge mirror 101b, the first support structure, and the second support structure are all enclosed within an encapsulating housing 104. An incident window for laser to enter the double wedge-shaped mirror and an exit window for laser to exit are formed in the corresponding position of the packaging shell 104. The package case 104 is used to package and integrate the spatial optical phase modulator, and can protect internal optical devices and the like.
The package housing 104 is supported by a housing support rod 106, and the bottom of the housing support rod 106 is connected to a support base 107, and the support base 107 is generally a magnetic base. The housing support rod 106 supports the entire package housing 104 at a certain height, which facilitates the application of the spatial optical phase modulator to the spatial optical path. The supporting base 107 facilitates fixing the whole spatial optical phase modulator on the experiment table.
Example 2:
referring to fig. 3 and 4, the present embodiment provides a spatial optical phase modulator, which is a piezoelectric ceramic driven spatial optical phase modulator based on a flexible hinge structure, and includes a double wedge mirror 101, a flexible hinge structure 102, a piezoelectric ceramic 103, a package housing 104, a piezoelectric ceramic controller 105, a housing support rod 106, a support base 107, and a second support structure 108. The double wedge mirror 101 is composed of a first wedge mirror 101a and a second wedge mirror 101 b.
The difference from embodiment 1 is that the piezoelectric ceramics 103 in this embodiment are disposed vertically. The flexible hinge structure is a linear or S-linear flexible support body disposed in the vertical direction, and the first wedge mirror 101a is disposed on an upper end surface of the flexible support body.
The piezoelectric ceramic controller 105 controls the piezoelectric ceramic 103 to generate vertical micro displacement, pushes the flexible hinge structure to generate vertical displacement, and also causes the first wedge-shaped mirror 101a to generate displacement in the vertical direction, so that flexible regulation and control of the phase of the transmission laser piston are realized.
The other configurations of embodiment 2 are the same as embodiment 1, and are not described again.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. Spatial optical phase modulator, characterized by: including two wedge mirrors, two wedge mirrors comprise first wedge mirror and second wedge mirror, the vertical relative setting of wedge face of first wedge mirror and second wedge mirror, first wedge mirror and second wedge mirror are by first bearing structure and the vertical support of second bearing structure respectively, at least one supporting mechanism can realize the flexible regulation of vertical direction under the control of controller in first bearing structure and the second bearing structure, change the vertical relative position of first wedge mirror and second wedge mirror, and then realize the regulation and control of transmission or reflection laser piston phase place through two wedge mirrors.
2. The spatial optical phase modulator of claim 1, wherein: the first supporting structure can realize the telescopic adjustment in the vertical direction, so that the first wedge-shaped mirror on the first supporting structure is driven to synchronously displace in the vertical direction, and the vertical relative position of the first wedge-shaped mirror and the second wedge-shaped mirror is changed.
3. The spatial optical phase modulator of claim 2, wherein: the first support structure comprises a flexible hinge structure body, piezoelectric ceramics and a piezoelectric ceramic controller, the first wedge-shaped mirror is vertically supported on the flexible hinge structure body, the flexible hinge structure body is connected with the piezoelectric ceramics, and the piezoelectric ceramics are connected with the piezoelectric ceramic controller in a control mode.
4. The spatial optical phase modulator of claim 3, wherein: the displacement of the piezoelectric ceramic is controlled through the piezoelectric ceramic controller, the piezoelectric ceramic pushes the flexible hinge structure body to generate a moment in the vertical direction, the first wedge-shaped mirror is caused to displace in the vertical direction, the vertical relative position of the first wedge-shaped mirror and the second wedge-shaped mirror is changed, and then the real-time regulation and control of the phase of the transmission or reflection laser piston of the double wedge-shaped mirrors are achieved.
5. The spatial optical phase modulator according to any one of claims 1 to 4, characterized in that: the laser packaging structure is characterized by further comprising a packaging shell, the first wedge-shaped mirror, the second wedge-shaped mirror, the first supporting structure and the second supporting structure are packaged in the packaging shell, and an incident window for laser to enter the double wedge-shaped mirrors and an exit window for laser to exit are arranged at the corresponding positions of the packaging shell.
6. The spatial optical phase modulator of claim 5, wherein: still include casing bracing piece and support base, the encapsulation casing is supported by the casing bracing piece, the bottom joint support base of casing bracing piece.
7. The spatial optical phase modulator of claim 6, wherein: the supporting base is a magnetic base.
8. The spatial optical phase modulator of claim 5, wherein: the first wedge-shaped mirror is a high lens, and the second wedge-shaped mirror is a high reflecting mirror or a high lens.
9. The spatial optical phase modulator of claim 8, wherein: the high reflectance mirror has a reflectance of 99% or more.
10. The spatial optical phase modulator of claim 8, wherein: the high lens has a transmittance of greater than or equal to 99%.
CN202011007475.5A 2020-09-23 2020-09-23 Spatial optical phase modulator Pending CN111965853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011007475.5A CN111965853A (en) 2020-09-23 2020-09-23 Spatial optical phase modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011007475.5A CN111965853A (en) 2020-09-23 2020-09-23 Spatial optical phase modulator

Publications (1)

Publication Number Publication Date
CN111965853A true CN111965853A (en) 2020-11-20

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CN202011007475.5A Pending CN111965853A (en) 2020-09-23 2020-09-23 Spatial optical phase modulator

Country Status (1)

Country Link
CN (1) CN111965853A (en)

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