CN115656042B - Large-rotation-angle tuning medium-and-long-wave infrared coherent light source device with stable light beam direction - Google Patents
Large-rotation-angle tuning medium-and-long-wave infrared coherent light source device with stable light beam direction Download PDFInfo
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Abstract
The invention relates to a long-wave infrared coherent light source device in large-angle tuning with stable beam pointing, which comprises a pulse laser, an isolator, an Optical Parametric Oscillator (OPO) input mirror, a nonlinear crystal, an OPO output mirror, a long-pass filter, a fixed right-angle prism and a movable right-angle prism. The laser is used for generating pump light; the pulse isolator is used for ensuring unidirectional laser transmission; the OPO input mirror, the nonlinear crystal and the OPO output mirror are used for generating medium-long wave infrared light; the long-pass filter is used for blocking residual pump light; the fixed right angle prism and the displacement right angle prism are used for compensating the transverse displacement of the output light beam caused in the rotation process of the crystal. The invention compensates the transverse displacement of the light beam by correspondingly moving the prism, realizes the invariable position of the output light beam with large rotation angle tuning, ensures the stable directivity of the output light beam and is beneficial to the subsequent application research. The invention has simple structure and simple and convenient operation, and is suitable for the requirements of infrared molecular spectrum, medical imaging, remote sensing and the like.
Description
Technical Field
The invention relates to the technical field of mid-infrared optics, in particular to a large-rotation-angle tuning mid-long-wave infrared coherent light source device with stable light beam pointing.
Background
The mid-to-long infrared band generally refers to the electromagnetic spectrum ranging in wavelength from 2.5-25 μm, an important transition region from visible to terahertz. The mid-long wave infrared band includes two important atmospheric windows of 3-5 μm and 8-12 μm. Mid-wave infrared (3-5 μm) lasers are gaining wide attention for very important applications in the military field. In addition, the mid-infrared 8-14 μm wave band is in the molecular fingerprint area of the substance, the molecular absorption peak of the area is more and more complex, the area has no strong characteristic, when the molecular structure is slightly different, the absorption of the area has slight difference, the fingerprints of various important substances such as CF4, NH3, O3, glucose and the like are all in the 8-14 μm wave band, and the accurate detection and identification of the important substances can be realized by utilizing the spectral analysis technology of 8-14 μm continuous tuning laser.
Up to now, no corresponding laser gain medium can directly obtain 3-17 μm tunable laser, and generally, an Optical Parametric Oscillation (OPO) mode is adopted to obtain laser output in this band. Many parameters of the mid-wavelength infrared coherent light source have important effects on the system, such as power, energy, divergence angle, spot size, repetition frequency, etc. The pointing stability of the laser output beam is also one of the important parameters of the light source, and it will reflect the output effect of the laser beam, affecting the development of the application field. The angle tuning method adopted by the patent is the method with the fastest tuning speed and the largest range at present. The tuning method is now simple and feasible if the wavelength range of the output laser light is to be realized to cover 3-17 μm. However, in the tuning process, the method can change the beam direction and influence the subsequent application due to the transverse displacement of the output beam caused by the rotation of the nonlinear crystal.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a large-rotation-angle tuning medium-and-long-wave infrared coherent light source device with stable beam pointing, which utilizes the interaction of pump light and nonlinear crystals to generate medium-and-long-wave infrared light, and realizes output wavelength tuning by rotating the nonlinear crystals, and keeps the beam pointing stable according to the relation between the offset distance of the beam generated by tuning and the compensation displacement required by a right-angle prism. The invention can be applied to infrared molecular spectrum, medical imaging, remote sensing and the like.
The technical scheme adopted by the invention for achieving the purpose is as follows:
The light beam directional stable large-rotation angle tuning medium-long wave infrared coherent light source device comprises a pulse laser, an isolator, an optical parametric oscillator OPO input mirror, a nonlinear crystal, an OPO output mirror, a long-pass filter, a fixed right-angle prism and a movable right-angle prism which are sequentially arranged along the light emitting direction of a pumping light source;
The pulse laser emits a pump beam; the isolator enables the pump beam to be transmitted in one direction; the light-passing surfaces of the isolator, the OPO input mirror and the OPO output mirror are parallel, and each light-passing surface is perpendicular to the pumping light beam;
the OPO input mirror and the OPO output mirror form a resonant cavity together, and the included angle theta between the central axis of the nonlinear crystal and the pumping beam is variable; the resonant cavity is used for enabling the input pump light to generate signal light and medium-long wave infrared idler frequency light in the cavity and nonlinear crystal oscillation; the OPO output mirror outputs residual pump light and medium-long wave infrared idler frequency light;
The light-passing end face of the filter forms an angle of 45 degrees with the residual pump light beam and is used for reflecting the residual pump light and transmitting the medium-wavelength and long-wave infrared idler frequency light;
The fixed right-angle prism and the movable right-angle prism are reversely placed and are parallel in inclined plane to form a parallel refraction structure; the distance L between the transverse relative positions of the movable right-angle prism and the fixed right-angle prism is variable, and the distance L is used for changing the effective thickness of the refraction structure.
The pulse laser is a neodymium-doped yttrium aluminum garnet laser; the pulse laser generates pumping light with the wavelength of 1064 nm; the isolator is a space optical isolator, and is plated with 1064nm antireflection film.
The OPO input mirror is a plane mirror, the lens material is K9 glass, the incident surface is plated with a pumping light antireflection film, and the emergent surface is plated with a pumping light antireflection film and a signal light high reflection film; the OPO output mirror is a plane mirror, the lens material is ZnSe, the incident surface is plated with a pumping light high-transmission film, a signal light high-reflection film and a medium-long wave infrared high-transmission film, and the emergent surface is plated with a pumping light high-transmission film and a medium-long wave infrared high-transmission film.
The nonlinear crystal material is a non-oxide selenium gallium barium crystal.
The long-pass filter is made of high-resistance Ge, and is coated with a near infrared high-reflection film and a 3-17 mu m medium-long wave infrared light antireflection film on the surface.
The fixed right-angle prism and the movable right-angle prism are both straight triangular prisms taking isosceles right-angle triangles as bottom edges, the material is ZnSe, and the surface is plated with an infrared antireflection film in the range of 3-17 mu m.
The nonlinear crystal is arranged on a horizontal turntable, and the turntable rotates to change the included angle theta between the central axis of the nonlinear crystal and the pumping beam.
The movable right-angle prism is arranged on the horizontal one-dimensional linear displacement table, and the distance L between the movable right-angle prism and the fixed right-angle prism can be adjusted along the direction perpendicular to the middle-length wave infrared idler light, so that the effective thickness of the refraction structure is changed, and the transverse displacement deviation of the output direction of the middle-length wave infrared idler light beam caused by the rotation of the nonlinear crystal in the tuning process is compensated.
The device also comprises an upper computer, wherein the computer is connected with the horizontal turntable below the nonlinear crystal and the one-dimensional linear displacement table below the movable rectangular prism and is used for outputting command signals to control the work of each device.
A method for controlling a long-wavelength infrared coherent light source in large-rotation-angle tuning with stable light beam pointing comprises the following steps:
Step 1: pre-calibrating a relation model between an included angle theta and a transverse relative position distance L: l=a×θ 3+b×θ2 +c×θ+d, where a, b, c, d is a model coefficient calibrated in advance multiple times;
Step 2: adjusting and detecting an included angle theta between the central axis of the nonlinear crystal 4 and the pump beam in real time;
Step 3: calculating a following transverse relative position distance L corresponding to the current included angle theta according to the relation model;
Step 4: and (3) adjusting the moving right-angle prism 8 to a value calculated in the step (3) along the direction perpendicular to the middle-long-wave infrared idler light, and adjusting the distance L between the moving right-angle prism 8 and the transverse relative position of the fixed right-angle prism 7 to change the effective thickness of the refraction structure, so as to compensate the transverse displacement deviation of the middle-long-wave infrared idler light beam in the output direction caused by the large rotation angle of the nonlinear crystal 4 in the tuning process, thereby realizing the stable beam pointing.
The invention has the following beneficial effects and advantages:
1. The invention utilizes the interaction of pump light in the nonlinear crystal to generate the medium-long wave infrared light, and changes the phase matching condition by rotating the angle of the nonlinear crystal, thereby realizing the tunable output of the medium-long wave infrared light.
2. The nonlinear crystal adopted by the invention is a non-oxide selenium gallium barium (BaGa 4Se7) crystal, the crystal has larger transparent wave band, larger second-order nonlinear coefficient and higher damage threshold, and meanwhile, the dielectric property of the crystal ensures the phase matching of pump light, thereby being beneficial to realizing the high-efficiency output of tunable infrared wave bands (wavelength 3-17 mu m).
3. The method for compensating the beam displacement, which is adopted by the invention, compensates the beam displacement caused by crystal rotation tuning by utilizing the position of the translation stage moving prism, realizes that the beam is not deflected due to tuning, and is kept at the position required by the subsequent light path.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of a beam-pointing stable large-angle tuned medium-length infrared coherent light source device provided by the invention;
FIG. 2 is a top view of an embodiment of a beam-pointing stable large-angle tuned medium-length infrared coherent light source device according to the present invention;
FIG. 3 is a flow chart of a control method of the apparatus of the present invention;
wherein 1 is a pulse laser, 2 is an isolator, 3 is an OPO input mirror, 4 is a nonlinear crystal, 5 is an OPO output mirror, 6 is a long-pass filter, 7 is a fixed rectangular prism, and 8 is a movable rectangular prism.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the invention provides a large-angle tuning medium-long wave infrared coherent light source device with stable beam direction, which comprises a pulse laser 1, an isolator 2, an OPO input mirror 3, a nonlinear crystal 4, an OPO output mirror 5, a long-pass filter 6, a fixed rectangular prism 7 and a movable rectangular prism 8, wherein the isolator 2, the OPO input mirror 3, the nonlinear crystal 4, the OPO output mirror 5, the long-pass filter 6, the fixed rectangular prism 7 and the movable rectangular prism 8 are sequentially arranged in the direction of a medium-long wave infrared output beam. The pulse laser 1 emits pumping light required by a medium-long wave infrared light source; the passing surfaces of the isolator 2, the OPO input mirror 3 and the OPO output mirror 5 are parallel, each passing surface is perpendicular to the input pumping light beam (namely, the generated medium-long wave infrared light); the long-pass filter 6 is arranged behind the OPO output mirror 5, and the light-passing end face of the long-pass filter 6 forms an angle of 45 degrees with the pump output light beam, so that the pump light emitted from the OPO output mirror 5 is blocked, the pump light transmitted by the pulse laser 1 is reflected along the direction perpendicular to the output light beam direction of the middle-long wave infrared light, and the light transmitted through the long-pass filter 6 is the middle-long wave infrared light; the isolator 2 is used for ensuring unidirectional laser transmission and avoiding damage of the pulse laser 1 caused by return light; the OPO input mirror 3 and the OPO output mirror 5 form a resonant cavity together, pump light enters the OPO resonant cavity, signal light and idler frequency light generated in the cavity are repeatedly oscillated in the cavity, and middle infrared light is transmitted and output; the nonlinear crystal 4 meets the phase matching condition of parametric oscillation (the phase matching is realized by utilizing the birefringence characteristic and the dispersion characteristic of the crystal), high-efficiency energy conversion and medium-long wave infrared tuning output are realized, and the included angle theta between the central axis of the nonlinear crystal 4 and the pump beam is variable; the long-pass filter 6 blocks the residual pump light and outputs medium-wavelength infrared light; the fixed right-angle prism 7 and the movable right-angle prism 8 are reversely arranged, the inclined planes are parallel to form a parallel refraction structure, the relative position L of the movable right-angle prism 8 and the fixed right-angle prism 7 is changed by adjusting the transverse position of the prism 8 along the direction perpendicular to the intermediate-wavelength infrared idler frequency light, the effective thickness of the refraction structure is changed, and the beam displacement caused by the rotation of the nonlinear crystal 4 in the tuning process is compensated. The movable rectangular prism 8 compensates for the offset generated by the output of the mid-wavelength infrared beam due to the rotation of the nonlinear crystal 4 after the fixed rectangular prism 7 by refraction, so that the position of the output beam remains unchanged.
As shown in fig. 3, the output wavelength of the mid-long wave infrared light source is adjusted by rotating the nonlinear crystal, changing the phase matching angle θ.
The working principle of the device is as follows:
Step 1: pre-calibrating a relation model between an included angle theta and a transverse relative position distance L: l=a×θ 3+b×θ2 +c×θ+d, where a, b, c, d is a model coefficient calibrated in advance for a plurality of times, and the relationship model is used to compensate the displacement in the output direction of the intermediate-and-long-wave infrared idler light beam caused by the rotation of the nonlinear crystal 4 in the tuning process;
Step 2: adjusting and detecting an included angle theta between the central axis of the nonlinear crystal 4 and the pump beam in real time;
step 3: calculating a following distance L corresponding to the current included angle theta according to the relation model;
Step 4: the movable right-angle prism 8 is adjusted along the direction perpendicular to the middle-long wave infrared idler frequency light, the relative position L between the movable right-angle prism 8 and the fixed right-angle prism 7 is adjusted to the position calculated in the step 3, so that the effective thickness (the optical path of light propagating in the fixed right-angle prism 7 and the movable right-angle prism 8) of the refraction structure is changed, the transverse displacement deviation in the output direction of the middle-long wave infrared idler frequency light beam caused by the large rotation angle of the nonlinear crystal 4 in the tuning process is compensated, and the stable beam pointing is realized.
Example 1:
Further, manual adjustment of example 1 may be employed: in the step2, the included angle theta between the central axis of the nonlinear crystal 4 and the pump beam is manually adjusted; in step 4, the relative position distance L between the movable rectangular prism 8 and the fixed rectangular prism 7 is set.
Example 2:
Furthermore, the technical scheme of embodiment 2, which can be automatically adjusted by setting the mobile device, can be further based on the device of embodiment 1, as shown in fig. 2. The nonlinear crystal 4 is arranged on a turntable which is connected with an upper computer. The movable right-angle prism 8 is arranged on the one-dimensional linear motion module, and a motor on the one-dimensional linear motion module is connected with an upper computer. The upper computer is provided with a program module, when executing a program, the upper computer outputs an instruction to a turntable (an electric turntable) (an automatic platform of a microminiature 5-phase stepping motor with the model of OSCM-25YAM of sigma company), a controller at the lower part is externally connected with the computer and used for controlling the turntable to move, a circular adapter plate is embedded in the center of the platform, a cylindrical supporting rod is fixed at the center of the adapter plate, a crystal is adhered to the other end of the supporting rod), and a one-dimensional linear motion module is realized, so that the following flow steps are realized, as shown in fig. 3:
Step S1: pre-calibrating a relation model between an included angle theta and a distance L: l=a×θ 3+b×θ2 +c×θ+d, where a, b, c, d is a model coefficient calibrated in advance for a plurality of times, and the relationship model is used to compensate the displacement in the output direction of the intermediate-and-long-wave infrared idler light beam caused by the rotation of the nonlinear crystal 4 in the tuning process;
Step S2: the turntable feeds back an included angle, detects an included angle theta between the central axis of the nonlinear crystal 4 and the pump beam in real time through the turntable, and feeds back the included angle theta to a computer program interface;
Step S3: calculating a following transverse relative position distance L corresponding to the current included angle theta according to the relation model;
Step S4: the motor on the one-dimensional linear motion module is controlled to rotate to drive the movable rectangular prism 8 to adjust the distance L between the movable rectangular prism 8 and the fixed rectangular prism 7 along the direction perpendicular to the middle-long-wave infrared idler light to the value calculated in the step 3, so that the effective thickness of the refraction structure (the optical path of light propagating in the fixed rectangular prism 7 and the movable rectangular prism 8) is changed, the transverse displacement deviation in the output direction of the middle-long-wave infrared idler light beam caused by the large rotation angle of the nonlinear crystal 4 in the tuning process is compensated, and the light beam pointing stability is realized.
In practical application, the pulse laser 1 is a commercial neodymium-doped yttrium aluminum garnet (Nd: YAG) Q-switched laser, and outputs near infrared light as pump light, and the wavelength of the near infrared light is 1064nm. The isolator 2 is a space optical isolator, is plated with a 1064nm antireflection film and is used for ensuring that pumping light passes through unidirectionally, enters a nonlinear crystal 4 through an OPO input mirror 3 and generates middle-long wave infrared light through the second-order nonlinear optical frequency conversion effect. By rotating the nonlinear crystal 4, the phase matching condition is changed, and the tunable medium-long wave infrared light output is realized. The OPO input mirror 3 is a plane mirror, K9 glass, a surface coating film, a pumping light antireflection film on the incident surface and a pumping light antireflection film signal light high-reflection film on the emergent surface. The nonlinear crystal 4 is a novel nonlinear crystal of non-oxide, the material is selenium gallium barium (BaGa 4Se7), the size of a light-passing surface is 10 multiplied by 7mm 2, the length is 15mm, the crystal has a larger second-order nonlinear coefficient and a higher damage threshold, meanwhile, the dielectric property of the crystal ensures the phase matching of a parametric oscillation process, the efficient energy conversion and mid-infrared light output are facilitated, and the wavelength tuning is realized by changing the incident angle of the nonlinear crystal. The OPO output mirror 5 is a plane mirror, the surface is coated with a film, the lens material is ZnSe, the incident surface is coated with a high-transmission pumping light film, a high-reflection signal light film and a medium-long wave infrared high-transmission pumping light film, and the emergent surface is coated with a high-transmission pumping light film and a medium-long wave infrared high-transmission pumping light film. The long-pass filter 6 is a high-resistance Ge substrate, and the surface of the long-pass filter is plated with a near infrared high-reflection film and a 3-17 mu m medium-long wave infrared light antireflection film, and is used for filtering out residual pumping light and realizing pure medium-long wave infrared light output. The fixed right-angle prism 7 and the displacement right-angle prism 8 are both straight triangular prisms taking isosceles right-angle triangles as the bottom edges, the right-angle side length is 25mm, the height is 25mm, the material is ZnSe, and the surface is plated with a 3-17 mu m mid-infrared antireflection film, so that the reflection loss of mid-infrared light is reduced.
The device for compensating the light beam offset generated by the medium-long wave infrared tuning by utilizing the translation of the right-angle triangular prism can be used for application research of molecular spectrum, medical imaging, remote sensing and the like. The optical path has simple and compact structure, is simple and convenient to operate, and is suitable for popularization in practical systems.
Claims (10)
1. The light beam directional stable large-rotation angle tuning medium-long wave infrared coherent light source device is characterized by comprising a pulse laser (1), an isolator (2), an optical parametric oscillator OPO input mirror (3), a nonlinear crystal (4), an OPO output mirror (5), a long-pass filter (6), a fixed right-angle prism (7) and a movable right-angle prism (8) which are sequentially arranged along the light emitting direction of a pumping light source; the pulse laser (1) emits a pump beam; the isolator (2) enables the pump beam to be transmitted in one direction; the light-passing surfaces of the isolator (2), the OPO input mirror (3) and the OPO output mirror (5) are parallel, and each light-passing surface is perpendicular to the pumping light beam; the OPO input mirror (3) and the OPO output mirror (5) form a resonant cavity together, and the included angle theta between the central axis of the nonlinear crystal (4) and the pumping beam is variable; the resonant cavity is used for enabling the input pump light to oscillate in the cavity and the nonlinear crystal (4) to generate signal light and medium-wavelength infrared idler frequency light; the OPO output mirror (5) outputs residual pump light and medium-long wave infrared idler frequency light; the light-transmitting end face of the optical filter (6) forms an angle of 45 degrees with the residual pump light beam and is used for reflecting the residual pump light and transmitting the medium-wavelength infrared idler frequency light; the fixed right-angle prism (7) and the movable right-angle prism (8) are reversely placed and are parallel in inclined plane to form a parallel refraction structure; the distance L between the transverse relative positions of the movable right-angle prism (8) and the fixed right-angle prism (7) is variable, and the distance L is used for changing the effective thickness of the refraction structure.
2. The beam-pointing stable large-rotation-angle tuning medium-and-long-wave infrared coherent light source device according to claim 1, characterized in that the pulse laser (1) is a neodymium-doped yttrium aluminum garnet laser; the pulse laser (1) generates pump light with the wavelength of 1064 nm; the isolator (2) is a space optical isolator and is plated with 1064nm antireflection film.
3. The large-rotation-angle tuning medium-and-long-wave infrared coherent light source device with stable beam pointing according to claim 1, wherein the OPO input mirror (3) is a plane mirror, the mirror material is K9 glass, the incident surface is plated with a pumping light antireflection film, and the emergent surface is plated with a pumping light antireflection film and a signal light high-reflection film; the OPO output mirror (5) is a plane mirror, the lens material is ZnSe, the incident surface is plated with a pumping light high-transmission, signal light high-reflection and medium-long wave infrared high-transmission film, and the emergent surface is plated with a pumping light high-transmission and medium-long wave infrared high-transmission film.
4. The beam-pointing stable large-rotation-angle tuning medium-and-long-wave infrared coherent light source device according to claim 1, wherein the nonlinear crystal (4) is made of a non-oxide selenium gallium barium crystal.
5. The light beam-pointing stable large-rotation angle tuning medium-and-long wave infrared coherent light source device according to claim 1, wherein the long-pass filter (6) is made of high-resistance Ge, and the surface is plated with a near infrared high-reflection film and a medium-and-long wave infrared anti-reflection film of 3-17 μm.
6. The large-rotation-angle tuning medium-long-wave infrared coherent light source device with stable beam pointing according to claim 1, wherein the fixed right-angle prism (7) and the movable right-angle prism (8) are both straight triangular prisms with isosceles right-angle triangles as bottom edges, are made of ZnSe, and are coated with medium-infrared antireflection films of 3-17 μm on the surfaces.
7. The beam-pointing stable large-rotation-angle tuning medium-and-long-wave infrared coherent light source device according to claim 1, wherein the nonlinear crystal (4) is arranged on a horizontal turntable, and the turntable rotates to change the included angle theta between the central axis of the nonlinear crystal (4) and the pumping beam.
8. The beam-pointing stable large-rotation-angle tuning medium-long-wave infrared coherent light source device according to claim 1, wherein the movable rectangular prism (8) is arranged on a horizontal one-dimensional linear displacement table, and can adjust the distance L between the movable rectangular prism and the fixed rectangular prism (7) along the direction perpendicular to the medium-long-wave infrared idler light, so as to change the effective thickness of the refraction structure and compensate the transverse displacement deviation of the output direction of the medium-long-wave infrared idler light beam caused by the rotation of the nonlinear crystal (4) in the tuning process.
9. The light beam pointing stable large-rotation angle tuning medium-long wave infrared coherent light source device according to any one of claims 7 or 8, further comprising an upper computer, wherein the computer is connected with a horizontal turntable below the nonlinear crystal (4) and a one-dimensional linear displacement table below the movable rectangular prism (8) and is used for outputting command signals to control the operation of each device.
10. The control method of the beam-pointing stable large-angle-of-rotation tuning medium-and-long-wave infrared coherent light source device according to any one of claims 1 to 9, comprising the steps of:
Step 1: pre-calibrating a relation model between an included angle theta and a transverse relative position distance L: l=a×θ 3+b×θ2 +c×θ+d, where a, b, c, d is a model coefficient calibrated in advance multiple times;
Step 2: adjusting and detecting an included angle theta between the central axis of the nonlinear crystal (4) and the pump beam in real time;
Step 3: calculating a following transverse relative position distance L corresponding to the current included angle theta according to the relation model;
Step 4: and (3) adjusting the moving right-angle prism (8) to the value calculated in the step (3) along the direction perpendicular to the middle-long wave infrared idler frequency light, and adjusting the transverse relative position distance L between the moving right-angle prism and the fixed right-angle prism (7) to change the effective thickness of the refraction structure, so as to compensate the transverse displacement deviation of the middle-long wave infrared idler frequency light beam in the output direction caused by the rotation of the nonlinear crystal (4) in the tuning process, thereby realizing the stable beam pointing.
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