CN109193316B - Multi-polarization period terahertz wave parametric oscillator - Google Patents

Multi-polarization period terahertz wave parametric oscillator Download PDF

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CN109193316B
CN109193316B CN201811187501.XA CN201811187501A CN109193316B CN 109193316 B CN109193316 B CN 109193316B CN 201811187501 A CN201811187501 A CN 201811187501A CN 109193316 B CN109193316 B CN 109193316B
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axis
wave
terahertz wave
terahertz
light
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CN109193316A (en
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邴丕彬
王花
张红涛
谭联
李忠洋
李永军
袁斌
袁胜
邓荣鑫
陈建明
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North China University of Water Resources and Electric Power
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North China University of Water Resources and Electric Power
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
    • H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid

Abstract

A multi-polarization period terahertz wave parametric oscillator comprises a pumping source, a multi-polarization period PPLN crystal, a first parabolic mirror and a second parabolic mirror, wherein the first parabolic mirror and the second parabolic mirror are arranged on two sides of the multi-polarization period PPLN crystal. A pump (pump) oscillating back and forth optically pumps the PPLN crystal, generating Stokes (Stokes) light and terahertz (THz) waves via optical parametric effects. The generated Stokes light oscillates back and forth in the ring resonator and amplifies THz waves through optical parametric effects. The generated THz wave exits perpendicular to the surface of the PPLN crystal. In the optical parametric process, Stokes light and pump light can be recycled, so that the utilization efficiency of the pump light is effectively improved. The generated THz wave is emitted out perpendicular to the surface of the PPLN crystal, any coupling-out device is not needed, and the THz wave output loss is effectively reduced.

Description

Multi-polarization period terahertz wave parametric oscillator
Technical Field
The invention relates to a multi-polarization period terahertz wave parametric oscillator, and belongs to the field of application of terahertz wave technology.
Background
Terahertz (THz) waves are electromagnetic waves having a frequency in the range of 0.1 to 10THz (1THz — 1012Hz), and are located between millimeter waves and infrared waves. The terahertz wave has wide application prospects in the aspects of spectrum detection, imaging, remote sensing, communication, biomedicine, military affairs and the like. At present, a terahertz radiation source with high power, high efficiency, coherence, tunability, miniaturization and room-temperature operation is poor. The PPLN crystal has a great second-order nonlinear coefficient, and the PPLN crystal has a small absorption coefficient for terahertz waves, so that the high-power terahertz waves can be generated by taking the PPLN crystal as a gain medium through an optical parametric effect.
Disclosure of Invention
The invention aims to provide a multi-polarization-period terahertz wave parametric oscillator which is used for solving the problems of low power, low efficiency and the like of the conventional terahertz radiation source.
In order to achieve the purpose, the scheme of the invention is as follows:
a multi-polarization period terahertz wave parametric oscillator comprises a pumping source, a multi-polarization period PPLN crystal, a first parabolic mirror and a second parabolic mirror, wherein the first parabolic mirror and the second parabolic mirror are arranged on two sides of the multi-polarization period PPLN crystal; the multi-polarization period PPLN crystal consists of A, B, C, D four parts of PPLN crystal; pumping light which oscillates back and forth is incident to the multi-polarization PPLN crystal, and four beams of Stokes light and four beams of terahertz waves are generated through an optical parameter effect; the parabolic mirror is provided with a through hole for the pumping light and the four beams of Stokes light to pass through; the four beams of Stokes light and the pump light are transmitted in a collinear way through the through hole on the parabolic mirror and are subjected to resonant amplification in a resonant cavity formed by the first reflecting mirror and the second reflecting mirror; the four beams of terahertz waves are respectively a first terahertz wave, a second terahertz wave, a third terahertz wave and a fourth terahertz wave; the X axis is parallel to the direction of the pump light emitted by the pump source, and the direction of the pump light which is transmitted along the X axis and faces the first reflector is the negative direction of the X axis; the Y axis is vertical to the X axis, and the direction of the third terahertz wave is the negative direction of the Y axis; the Z axis is vertical to the X axis, and the direction of the second terahertz wave is the positive direction of the Z axis; the first terahertz wave is transmitted along the negative direction of the X axis and is coupled and output along the positive direction of the Z axis through the first parabolic mirror; the fourth terahertz wave is transmitted in the positive direction of the X and is coupled and output in the positive direction of the Z axis through the second parabolic mirror; the second terahertz wave is positively propagated along the Z axis and is output in a direction vertical to the X-Y plane of the PPLN crystal; and the third terahertz wave is transmitted along the negative direction of the Y axis and is output in a direction vertical to the X-Z plane of the PPLN crystal.
In the multi-polarization period terahertz wave parametric oscillator, the lengths of the PPLN crystal in the X-axis, Y-axis and Z-axis directions are 4cm, 5mm and 2mm respectively.
In the multi-polarization period terahertz wave parametric oscillator, the multi-polarization period PPLN crystal is a cuboid and is composed of A, B, C, D parts of PPLN crystal, and the periodic wave vector K Λ a, the pump light wave vector Kp, the Stokes light wave vector Ks and the first terahertz wave vector KT of the part a satisfy a quasi-phase matching relationship: i Kp|-|Ks|+|KT|-|KΛA0, |; the periodic wave vector K Λ B, the pump light wave vector Kp and the Stokes light wave vector Ks of the part B meet the quasi-phase matching relationship: i Kp|-|Ks|-|KΛB0, |; the C part periodic wave vector K Lambda C, the pump light wave vector Kp, the Stokes light wave vector Ks and the third terahertz wave vector KT meet the quasi-phase matching relationship: (| K)p|-|Ks|)2+(|KT|)2＝(|KΛC|)2(ii) a The D part of periodic wave vector K Λ D, the pump light wave vector Kp, the Stokes light wave vector Ks and the fourth terahertz wave vector KT meet the quasi-phase matching relationship: i Kp|-|Ks|-|KT|+|KΛD|＝0。
In the multi-polarization periodic terahertz wave parametric oscillator, the periodic wave vector directions of the A, B, D parts are parallel to the X axis, and the periodic wave vector direction of the C part forms a 66-degree included angle with the X axis
In the multi-polarization period terahertz wave parametric oscillator, the wavelengths of the four beams of Stokes light are all equal.
According to the multi-polarization-period terahertz wave parametric oscillator, the frequency of the four beams of terahertz waves is equal.
In the multi-polarization-period terahertz wave parametric oscillator, the center of the parabolic mirror is provided with a through hole for the pumping light and the four beams of Stokes light to pass through.
In the multi-polarization-period terahertz wave parametric oscillator, the first reflecting mirror and the second reflecting mirror are plane mirrors.
The multi-polarization period terahertz wave parametric oscillator, the first reflector and the second reflector are used for totally reflecting the pumping light and the Stokes light.
Compared with the existing terahertz radiation source based on the optical parametric effect, the multi-polarization-period terahertz parametric oscillator has the following advantages:
(1) the Stokes light oscillates back and forth in the resonant cavity, and the terahertz waves can be effectively amplified through an optical parameter effect.
(2) One beam of pump light can generate four beams of terahertz waves, and the optical conversion efficiency is effectively increased.
(3) In the optical parameter process, Stokes light and pump light in the cavity can be recycled, and the utilization efficiency of the pump light is effectively improved.
(4) Four beams of terahertz waves are emitted out perpendicular to the surface of the PPLN crystal, any coupling output device is not needed, and terahertz wave output loss is effectively reduced.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a plan view of four portions of a PPLN crystal A, B, C, D.
FIG. 3 is a schematic diagram of phase matching of pump light, Stokes light and terahertz waves in a PPLN crystal.
In the figure, Kp, Ks and KT are wave vectors of pump light, Stokes light and terahertz wave respectively.
And the K Lambda, the K Lambda B, the K Lambda C and the K Lambda D are periodic wave vectors of the four parts of the PPLN crystal A, B, C, D respectively.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of a multi-polarization periodic terahertz parametric oscillator according to the present invention. As can be seen, the terahertz radiation source includes: mirrors 1, 5, a KD x P crystal 2, a polarizer 3, a laser pumping module 4, a multi-poled periodic PPLN crystal 6.
The pump source is composed of reflectors 1 and 5, a KD x P crystal 2, a polaroid 3 and a laser pump module 4, and pump light 7 emitted by the pump source is subjected to resonant amplification in a resonant cavity composed of the reflectors 1 and 5. YAG quasi-continuous laser with wavelength of 1064nm, pulse width of 30ns, repetition frequency of 20KHz, beam diameter of 1mm, and power density of 100MW/cm2 was used as the pumping source in this example.
The X axis is parallel to the direction of the pump light emitted by the pump source, and the direction of the pump light 7 which is transmitted along the X axis and faces the first reflector 1 is the negative direction of the X axis; the Y axis is perpendicular to the X axis, and the direction of the third terahertz wave 12 is the negative direction of the Y axis; the Z axis is perpendicular to the X axis, and the direction of the second terahertz wave 11 is the positive direction of the Z axis;
the multi-polarization period PPLN crystal is cuboid and consists of A, B, C, D parts of PPLN crystals;
the pump light 7 oscillating back and forth in the X-axis direction is incident on the multi-polarization period PPLN crystal 6, and in the a portion of the multi-polarization period PPLN crystal 6, the pump light 7 generates Stokes light 8 and terahertz waves 9 through the backward optical parametric effect. The Stokes light 8 is generated to propagate collinearly with the pump light 7 and is amplified in resonance in a resonant cavity formed by the reflectors 1 and 5. The generated terahertz waves 9 are transmitted along the negative direction of the X axis and are coupled and output along the positive direction of the Z axis through the parabolic mirror 10.
In the B portion of the PPLN crystal 6, the pump light 7 generates Stokes light 8 and terahertz waves 11 via an optical parametric effect. The Stokes light 8 is generated to propagate collinearly with the pump light 7 and is amplified in resonance in a resonant cavity formed by the reflectors 1 and 5. The generated terahertz wave 11 propagates in the forward direction along the Z axis, and is output perpendicularly to the X-Y plane of the PPLN crystal 6.
In the C portion of the PPLN crystal 6, the pump light 7 generates Stokes light 8 and terahertz waves 12 via an optical parametric effect. The Stokes light 8 is generated to propagate collinearly with the pump light 7 and is amplified in resonance in a resonant cavity formed by the reflectors 1 and 5. The generated terahertz wave 12 is transmitted in the negative direction along the Y axis and is output perpendicular to the X-Z plane of the PPLN crystal 6.
In the D portion of the PPLN crystal 6, the pump light 7 generates Stokes light 8 and terahertz waves 13 via the forward optical parametric effect. The Stokes light 8 is generated to propagate collinearly with the pump light 7 and is amplified in resonance in a resonant cavity formed by the reflectors 1 and 5. The generated terahertz waves 13 are transmitted along the X axis in the forward direction and are coupled and output along the Z axis in the forward direction through a parabolic mirror 14. In this embodiment, the propagation directions of the pump light 7, the Stokes light 8 and the four terahertz waves 9, 11, 12, 13 are shown in fig. 1, and the phases of the pump light 7, the Stokes light 8 and the four terahertz waves 9, 11, 12, 13 are matched as shown in fig. 3.
The first reflecting mirror 1 and the second reflecting mirror 5 used in this embodiment are flat mirrors. The first reflector 1 and the second reflector 5 totally reflect the pump light 7 with the wavelength of 1064nm and the Stokes light 8 with the wavelength of 1065.9nm to form a resonant cavity of the pump light 7 and the Stokes light 8.
The lengths of the PPLN crystal 6 in the X-axis, Y-axis and Z-axis directions are 4cm, 5mm and 2mm, respectively. The A part of periodic wave vectors K Lambda, the 7 wave vectors Kp of the pump light, the 8 wave vectors Ks of the Stokes light and the 9 wave vectors KT of the terahertz wave satisfy a quasi-phase matching relationship: i Kp|-|Ks|+|KT|-|KΛAAnd | ═ 0. The B part periodic wave vector K Lambda B, the pump light 7 wave vector Kp and the Stokes light 8 wave vector Ks satisfy a quasi-phase matching relation: i Kp|-|Ks|-|KΛBAnd | ═ 0. The C part periodic wave vector K Lambda C, the pump light 7 wave vector Kp, the Stokes light 8 wave vector Ks and the terahertz wave 12 wave vector KT meet the quasi-phase matching relationship: (| K)p|-|Ks|)2+(|KT|)2＝(|KΛC|)2. The D part of periodic wave vector K Λ D, the 7 wave vector Kp of the pump light, the 8 wave vector Ks of the Stokes light and the 13 wave vector KT of the terahertz wave satisfy the quasi-phase matching relationship: i Kp|-|Ks|-|KT|+|KΛDAnd | ═ 0. In this embodiment, the polarization period lengths of A, B, C, D are respectively 13.4 μm, 43.5 μm, 17.5 μm and 34.7 μm, the periodic wave vector direction of A, B, D is parallel to the X axis, and the periodic wave vector direction of C forms an angle of 66 ° with the X axis.
The parabolic mirrors 10 and 14 used in this embodiment totally reflect the terahertz waves 9 and 13, respectively. The parabolic mirrors 10, 14 are each drilled with a small hole in the center, the size of the small hole being just enough to allow the pump light 7 and the Stokes light 8 to pass through.
In this embodiment, the wavelengths of the Stokes light 8 are all equal to 1065.9nm, and the frequencies of the terahertz waves 9, 11, 12, and 13 are all equal to 0.5 THz.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.

Claims (8)

1. A multi-polarization period terahertz wave parametric oscillator is characterized in that: the laser pumping device comprises a pumping source, a multi-polarization period PPLN crystal (6), and a first parabolic mirror (10) and a second parabolic mirror (14) which are arranged on two sides of the multi-polarization period PPLN crystal (6), wherein the pumping source consists of a KD (x P) crystal (2), a polarizing plate (3), a laser pumping module (4), a first reflecting mirror (1) and a second reflecting mirror (5);
the multi-polarization period PPLN crystal consists of A, B, C, D four parts of PPLN crystal; pumping light (7) oscillating back and forth enters a multi-polarization period PPLN crystal (6) to generate four beams of Stokes light (8) and four beams of terahertz waves through an optical parameter effect;
the parabolic mirror is provided with a through hole for the pump light (7) and the four beams of Stokes light (8) to pass through; the four beams of Stokes light (8) are transmitted with the pump light (7) in a collinear way through a through hole on the parabolic mirror and are amplified in a resonant cavity formed by the first reflecting mirror (1) and the second reflecting mirror (5) in a resonant mode; the four beams of terahertz waves are respectively a first terahertz wave (9), a second terahertz wave (11), a third terahertz wave (12) and a fourth terahertz wave (13);
the X axis is parallel to the direction of the pump light emitted by the pump source, and the direction of the pump light (7) which is transmitted along the X axis and faces the first reflector (1) is the negative direction of the X axis; the Y axis is vertical to the X axis, and the direction of the third terahertz wave (12) is the negative direction of the Y axis; the Z axis is vertical to the X axis, and the direction of the second terahertz wave (11) is the positive direction of the Z axis;
the first terahertz wave (9) is transmitted along the negative direction of the X axis and is coupled and output along the positive direction of the Z axis through the first parabolic mirror (10); the fourth terahertz wave (13) is transmitted along the X forward direction and is coupled and output along the Z axis forward direction through a second parabolic mirror (14); the second terahertz wave (11) is positively propagated along the Z axis and is output perpendicular to the X-Y plane of the PPLN crystal (6); the third terahertz wave (12) is transmitted along the Y axis in the negative direction and is output in a direction vertical to the X-Z plane of the PPLN crystal (6);
the multi-polarization period PPLN crystal is cuboid and consists of A, B, C, D parts of PPLN crystal, and the wave vector K of the A part of periodΛAWave vector K of pump light (7)pStokes light (8) wave vector KsA wave vector K of the first terahertz wave (9)TThe quasi-phase matching relation is satisfied: i Kp|-|Ks|+|KT|-|KΛA0, |; periodic wave vector K of part BΛBWave vector K of pump light (7)pStokes light (8) wave vector KsThe quasi-phase matching relation is satisfied: i Kp|-|Ks|-|KΛB0, |; periodic wave vector K of part CΛCWave vector K of pump light (7)pStokes light (8) wave vector KsA third terahertz wave (12) wave vector KTThe quasi-phase matching relation is satisfied: (| K)p|-|Ks|)2+(|KT|)2＝(|KΛC|)2(ii) a Periodic wave vector K of part DΛDWave vector K of pump light (7)pStokes light (8) wave vector KsAnd a fourth terahertz wave (13) wave vector KTThe quasi-phase matching relation is satisfied: i Kp|-|Ks|-|KT|+|KΛD|＝0。
2. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: the lengths of the PPLN crystal (6) in the X-axis, Y-axis and Z-axis directions are 4cm, 5mm and 2mm, respectively.
3. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: A. b, D, the directions of the periodic wave vectors of the three parts are parallel to the X axis, and the directions of the periodic wave vectors of the C part form an included angle of 66 degrees with the X axis.
4. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: the four beams of Stokes light (8) are all equal in wavelength.
5. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: the frequency of the four terahertz waves is equal.
6. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: the center of the paraboloidal mirror is provided with a through hole for the pumping light (7) and the four beams of Stokes light (8) to pass through.
7. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: the first reflector (1) and the second reflector (5) are plane mirrors.
8. The multi-polarization periodic terahertz wave parametric oscillator of claim 1, wherein: the first reflector (1) and the second reflector (5) totally reflect the pump light (7) and the Stokes light (8).
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