CN112051696A - Miniaturized compression source generating device - Google Patents
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- CN112051696A CN112051696A CN202010851959.1A CN202010851959A CN112051696A CN 112051696 A CN112051696 A CN 112051696A CN 202010851959 A CN202010851959 A CN 202010851959A CN 112051696 A CN112051696 A CN 112051696A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
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- G—PHYSICS
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- 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
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/001—Optical devices or arrangements for the control of light using movable or deformable optical elements based on interference in an adjustable optical cavity
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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
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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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
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
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Abstract
The invention relates to a miniaturized compressed source generating device, belonging to the technical field of continuous variable non-classical optical field generating equipment, comprising a laser source, an optical isolation device, an optical resonant cavity and an optical reflection device; laser output by the laser source enters the optical resonant cavity after passing through the optical isolation device, generated frequency doubling light is output from the optical resonant cavity after being subjected to parametric up-conversion in the optical resonant cavity, reflected by the optical reflection device and then returns to the optical resonant cavity along the original path, and is used as pump light to be subjected to parametric down-conversion between the generated fundamental frequency compression light and the nonlinear crystal in the optical resonant cavity, and the generated fundamental frequency compression light is output from the optical resonant cavity, returned to the optical isolation device and output through the optical isolation device. The device disclosed by the invention realizes the generation of a high-quality compressed-state light field only through a single optical cavity without an additional frequency doubling cavity under the injection of low-power laser, has the advantages of compact structure, easiness in adjustment, strong practicability and easiness in production and batch production, and can be applied to the frontier fields of quantum precision measurement, biological measurement, quantum imaging and the like.
Description
Technical Field
The invention belongs to the technical field of continuous variable non-classical light field generation, and particularly relates to a miniaturized compression source generation device with compact structure and strong practicability.
Background
The continuous variable compressed state optical field is an important non-classical optical field, can reduce the quantum fluctuation of some observable physical quantity of the optical field to be below the standard quantum limit, is one of the most basic and most hot research contents in the field of continuous variable quantum information all the time, and is widely applied to numerous research fields such as gravitational wave detection, optical precision measurement, quantum information science and the like.
At present, parametric down-conversion is the most effective generation mode of compressed light, and high-quality compressed light can be obtained based on the mode, but the method needs a frequency doubling cavity to generate frequency doubling light, and an optical parametric oscillator is pumped by the frequency doubling light to obtain a compressed optical field. Due to the addition of the frequency doubling cavity, extra cavity length, large phase locking devices and the like are needed, and the system is complex in structure; the compressed light field can be obtained by utilizing parametric up-conversion, and the advantages of the compressed light field are that the compressed state of the light beam with shorter wavelength can be obtained, the device is simple and is beneficial to practical application, but the defects of the compressed light field are that the obtained compressed light has low compression degree and cannot meet the practical requirement.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: a miniaturized compressed source generating device is provided, under the injection of low-power laser, a high-quality compressed optical field is generated through a single optical cavity without an additional frequency doubling cavity.
In order to solve the technical problems, the invention adopts the technical scheme that: a miniaturized compressed source generating device comprises a laser source, an optical isolation device, an optical resonant cavity and an optical reflection device; laser output by the laser source enters the optical resonant cavity after passing through the optical isolation device, generated frequency doubling light is output from the optical resonant cavity after being subjected to parametric up-conversion in the optical resonant cavity, reflected by the optical reflection device and then returns to the optical resonant cavity along the original path, and is used as pump light to be subjected to parametric down-conversion between the generated fundamental frequency compression light and the nonlinear crystal in the optical resonant cavity, and the generated fundamental frequency compression light is output from the optical resonant cavity, returned to the optical isolation device and output through the optical isolation device.
The optical isolator is an optical isolator or an optical fiber circulator.
The optical resonant cavity comprises a nonlinear crystal, and a first cavity mirror, a second cavity mirror, a third cavity mirror and a fourth cavity mirror which form a four-mirror annular cavity, wherein the first cavity mirror and the second cavity mirror are plano-concave mirrors, the third cavity mirror and the fourth cavity mirror are plane cavity mirrors, the first cavity mirror is an input-output coupling mirror, the outer end surface of the first cavity mirror is plated with a fundamental frequency light and frequency doubling light dual-transmission film, and the inner end surface can enable fundamental frequency light and frequency doubling light to transmit.
The reflectivity of the second cavity mirror, the third cavity mirror and the fourth cavity mirror to the fundamental frequency light and the frequency doubling light is more than 99.9%, and two end faces of the nonlinear crystal plating are plated with fundamental frequency light and frequency doubling light double-band antireflection films.
The inner end of the first cavity mirror has a transmittance of 10% for fundamental frequency light and a transmittance of 20% for frequency doubled light.
One of the cavity mirrors of the optical resonant cavity is fixedly arranged on a first piezoelectric ceramic, and the first piezoelectric ceramic is used for adjusting the cavity length of the optical resonant cavity.
The light reflection device comprises a dichroic mirror, a base frequency light reflection mirror and a frequency doubling light reflection mirror, the frequency doubling light reflection mirror is fixedly arranged on the second piezoelectric ceramic, base frequency light and frequency doubling light output from the optical resonant cavity are separated through the dichroic mirror, the separated base frequency light and frequency doubling light respectively return to the dichroic mirror after being reflected by the base frequency light reflection mirror and the frequency doubling light reflection mirror, and then return to the optical resonant cavity after passing through a primary path of the dichroic mirror.
One surface of the dichroic mirror close to the optical resonant cavity is anti-reflection to the frequency doubling light, the base frequency light is highly reflective, and the other surface is anti-reflection to the frequency doubling light.
The transmission rate of the side of the dichroic mirror close to the optical resonant cavity, facing to the frequency doubling light, is more than 97%, the reflectivity of the fundamental frequency light is more than 99.9%, and the reflectivity of the other side, facing to the frequency doubling light, is less than 0.5%.
The laser source, the optical isolation device, the optical resonant cavity and the optical reflection device are fixed on an optical vibration isolation platform which is convenient to move.
Compared with the prior art, the invention has the following beneficial effects: the invention realizes the parametric up-conversion and the parametric down-conversion in a single optical resonant cavity simultaneously by feeding back the frequency doubling light generated by the parametric up-conversion, and can obtain the compressed light with high compression degree only by injecting the low-power fundamental frequency light. Experiments prove that 5dB of vacuum compression light can be obtained by injecting 25mW of fundamental frequency light; and the device does not need to lock the relative phase of the pump light and the seed light, only needs to lock the cavity length of the optical resonant cavity, and has the advantages of simple locking device, easy adjustment of an experimental system and simple and convenient operation. The quantum imaging device has the advantages of compact structure, easiness in adjustment, strong practicability, easiness in production and batch production, and capability of being applied to the leading-edge fields of quantum precision measurement, biological measurement, quantum imaging and the like.
Drawings
Fig. 1 is a schematic block diagram of a miniaturized compressed source generating device according to an embodiment of the present invention;
FIG. 2 is a schematic optical path diagram of a miniaturized compressed source generating device according to an embodiment of the present invention;
FIG. 3 is a graph of the measurement results of the compressed state of the optical field generated by the present invention over the analysis frequency range of 0-10 MHz;
FIG. 4 is a graph of the measurement results of the compressed state of the optical field at an analysis frequency of 2MHz for the compressed light generated by an embodiment of the present invention;
1-laser source, 2-optical isolator, 3-optical resonator, 4-optical reflector, 5-platform, 6-first polarization beam splitter prism, 7-Faraday optical rotator, 8-second polarization beam splitter prism, 9-first cavity mirror, 10-second cavity mirror, 11-third cavity mirror, 12-fourth cavity mirror, 13-fundamental frequency light, 14-frequency doubling light, 15-dichroic mirror, 16-fundamental frequency light high reflection mirror, 17-frequency doubling light high reflection mirror, 18-compressed light.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a miniaturized compressed source generating device, including: the laser comprises a laser source 1, an optical isolation device 2, an optical resonant cavity 3 and an optical reflection device 4, wherein the laser 1 outputs laser; the optical isolation device 2 is used for outputting compressed light generated by the optical resonant cavity; the optical resonant cavity 3 is used for generating a compressed state optical field; the light reflection device 4 reflects the fundamental frequency light 13 and the frequency doubling light 14 into the optical resonant cavity 3 to generate a compressed state light field. In order to enable the system to stably output compressed light and be suitable for various application scenes, the above components are fixed on a small vibration isolation platform 5 which is convenient to move.
In this embodiment, the laser light output by the laser light source 1 passes through the optical isolator 2 and then enters the optical resonant cavity 3, after parametric up-conversion occurs in the optical resonant cavity 3, the generated frequency doubling light is output from the optical resonant cavity 3, reflected by the light reflector 4 and then returns to the optical resonant cavity 3 along the original path, and is used as pump light to be subjected to parametric down-conversion with the nonlinear crystal in the optical resonant cavity 3, and the generated fundamental frequency compression light is emitted from the optical resonant cavity 3 and then returns to the optical isolator 2 and is output through the optical isolator 2.
As shown in fig. 2, for a schematic optical path diagram of a miniaturized compressed source generating device according to an embodiment of the present invention, in particular, in this embodiment, the optical resonant cavity 3 includes a nonlinear crystal and a first cavity mirror 9, a second cavity mirror 10, a third cavity mirror 11, and a fourth cavity mirror 12 which form a four-mirror annular cavity, the first cavity mirror 9 and the second cavity mirror 10 are plano-concave mirrors, the third cavity mirror 11 and the fourth cavity mirror 12 are planar cavity mirrors, the first cavity mirror 9 is an input-output coupling mirror, an outer end surface thereof is plated with a fundamental frequency light and frequency doubling light dual-transmittance film, and an inner end surface thereof can transmit fundamental frequency light and frequency doubling light. Specifically, the inner end of the first cavity mirror 9 has a transmittance of 10% for fundamental light and a transmittance of 20% for frequency doubled light. In addition, the transmittance of the inner end of the first cavity mirror 9 facing the fundamental frequency light and the frequency doubled light can be set as required, and only the transmittance is required. The reflectivity of the second cavity mirror 10, the third cavity mirror 11 and the fourth cavity mirror 12 to the fundamental frequency light and the frequency doubling light is more than 99.9%. The nonlinear crystal in the optical resonant cavity 3 is a PPKTP crystal with the size of 1 x 2 x 10mm, two surfaces of the crystal are respectively plated with fundamental frequency light and frequency doubling light antireflection films, the temperature of the PPKTP crystal is controlled at a phase matching point by a commercial temperature controller, and the temperature control precision is 0.01 ℃.
One of the cavity mirrors of the optical resonant cavity 3 is fixedly arranged on a first piezoelectric ceramic, and the first piezoelectric ceramic is used for actively controlling the cavity length of the optical resonant cavity 3, namely locking the cavity length of the optical resonant cavity 3. As shown in fig. 2, in the present embodiment, the optical isolator element 2 is an optical isolator formed by combining two polarization beam splitters and one faraday rotator, and the optical isolator element 2 may be an optical fiber circulator.
Further, as shown in fig. 2, the light reflection device 4 includes a dichroic mirror 15, a fundamental frequency light reflection mirror 16 and a frequency doubling light reflection mirror 17, the frequency doubling light reflection mirror 17 is fixedly disposed on the second piezoelectric ceramic, the fundamental frequency light and the frequency doubling light output from the optical resonant cavity 3 are separated through the dichroic mirror 15, the separated fundamental frequency light and the separated frequency doubling light are respectively reflected by the fundamental frequency light reflection mirror 16 and the frequency doubling light reflection mirror 17 and then return to the dichroic mirror 15, and then return to the optical resonant cavity 3 after passing through the dichroic mirror 15. One surface of the dichroic mirror 15 close to the optical resonant cavity 3 is anti-reflection to frequency doubling light, the fundamental frequency light is highly reflective, and the other surface is anti-reflection to frequency doubling light. The transmittance of one surface of the dichroic mirror 15 close to the optical resonant cavity 3 for the frequency doubling light is more than 97%, the reflectance of the fundamental frequency light is more than 99.9%, and the reflectance of the other surface for the frequency doubling light is less than 0.5%. Through the second piezoelectric ceramic, the relative phase between the pump light and the seed light, namely the relative phase between the frequency doubling light and the fundamental frequency compression light can be scanned, and the classical gain can be monitored through scanning the phase.
In this embodiment, 1080nm fundamental frequency light emitted from the laser source 1 passes through the optical isolator 2, is injected into the optical resonator 3, and after the cavity length of the optical resonator 3 is locked by a standard PDH frequency stabilization technique, the optical resonator 3 stably outputs 540nm frequency doubled light 14, the fundamental frequency light 13 reflected by the first cavity mirror 9 and the frequency doubled light 14 output by the optical resonator 3 are separated by a dichroic mirror 15, and are respectively reflected by a fundamental frequency light high-reflection mirror 16 and a frequency doubled light high-reflection mirror 17, and then return to and enter the optical resonator 3 through the dichroic mirror 15 to generate compressed light 18, and the generated compressed light 18 is output by the first cavity mirror 9, returns to the optical isolator 2, and can be detected by using a balanced homodyne detection apparatus.
As shown in fig. 2, a schematic optical path diagram of a miniaturized compressed source generating device according to an embodiment of the present invention is shown: 1080nm fundamental frequency light emitted by the laser 1 passes through the optical isolator 2 (the optical isolator used in this embodiment is a combination of a polarization beam splitter prism and a faraday optical rotator), and is injected into the optical resonant cavity 3, after the cavity length of the optical resonant cavity 3 is locked by a standard PDH frequency stabilization technology, the optical resonant cavity 3 stably outputs 540nm frequency doubling light 14, the fundamental frequency light 13 reflected by the first cavity mirror 9 as an input-output mirror and the frequency doubling light 14 output by the optical resonant cavity 3 are separated by the dichroic mirror 15, and are respectively reflected by the first high reflection mirror 16 and the second high reflection mirror 17, and enter the optical resonant cavity 3 to generate compressed light 18, and the generated compressed light 18 is output by the optical isolator 2 and is detected by using a balanced homodyne detection device.
As shown in fig. 3, the measurement result of the optical field in the vacuum compression state generated in the embodiment of the present invention is shown, at this time, the injection power in front of the optical resonant cavity is 25mW, and the scanning frequency is 0-10 MHz. Wherein (a) is inverse compression, (b) is shot noise benchmark, (c) is compression, and (d) is electronic noise, the results show that in the range of 0-10MHz, the compressed light is prepared.
As shown in fig. 4, the measurement result of the optical field in the vacuum compression state generated in the embodiment of the present invention is shown, the injection power of the optical resonant cavity is 25mW, and the measured analysis frequency is 2 MHz. Wherein, (a) represents the shot noise reference, and (b) represents the noise power curve of the compressed light along with the phase change of the local light, and the result shows that the compression degree of the compressed state light field is 5 dB. The miniaturized compression source designed by the invention obtains stable output of compressed light under the condition of low injection power.
The invention reflects the frequency-doubled light output by the optical resonant cavity back to the optical resonant cavity to participate in parametric down-conversion, so that the result which can be realized by two optical resonant cavities in the past can be realized by using a single optical resonant cavity, and the volume of a compressed source is reduced by the device, thereby being beneficial to widely applying a compressed light field to aspects of real life.
It should be noted that the present invention can be implemented by using lasers including, but not limited to, 1550nm, 1342nm, 1064nm and 795nm as laser sources based on the above embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A miniaturized compressed source generating device, characterized by: the device comprises a laser source (1), an optical isolation device (2), an optical resonant cavity (3) and an optical reflection device (4); laser output by the laser source (1) enters the optical resonant cavity (3) after passing through the optical isolation device (2), after parametric up-conversion occurs in the optical resonant cavity (3), generated frequency doubling light is output from the optical resonant cavity (3), and is reflected by the light reflection device (4) and then returns to the optical resonant cavity (3) along the original path, and is used as pump light to perform parametric down-conversion with nonlinear crystals in the optical resonant cavity (3), and generated fundamental frequency compression light is emitted from the optical resonant cavity (3), returns to the optical isolation device (2), and is output through the optical isolation device (2).
2. A miniaturized compressed source generating device according to claim 1, characterized in that said optical isolator element (2) is an optical isolator or a fiber loop-through.
3. The miniaturized compressed source generating device according to claim 1, wherein the optical resonator (3) comprises a nonlinear crystal and a first cavity mirror (9), a second cavity mirror (10), a third cavity mirror (11) and a fourth cavity mirror (12) which form a four-mirror annular cavity, the first cavity mirror (9) and the second cavity mirror (10) are plano-concave mirrors, the third cavity mirror (11) and the fourth cavity mirror (12) are plane cavity mirrors, the first cavity mirror (9) is an input-output coupling mirror, the outer end surface of the first cavity mirror is plated with a fundamental frequency light and frequency doubling light double-transmittance film, and the inner end surface can transmit fundamental frequency light and frequency doubling light.
4. The miniaturized compressed source generating device according to claim 3, wherein the reflectivity of the second cavity mirror (10), the third cavity mirror (11) and the fourth cavity mirror (12) to the fundamental frequency light and the frequency doubling light is more than 99.9%, and both end faces of the nonlinear crystal plating are plated with fundamental frequency light and frequency doubling light double-band antireflection films.
5. A miniaturized compressed source generating device according to claim 3, characterized in that the inner end of said first cavity mirror (9) has a transmission rate of 10% for fundamental frequency light and 20% for frequency doubled light.
6. The miniaturized compressed source generating device according to claim 1, wherein one of the cavity mirrors of the optical resonant cavity (3) is fixedly arranged on a first piezoelectric ceramic, and the first piezoelectric ceramic is used for adjusting the cavity length of the optical resonant cavity (3).
7. The miniaturized compressed source generating device according to claim 1, wherein the light reflecting device (4) comprises a dichroic mirror (15), a fundamental frequency light reflecting mirror (16) and a frequency doubling light reflecting mirror (17), the frequency doubling light reflecting mirror (17) is fixedly arranged on the second piezoceramic, the fundamental frequency light and the frequency doubling light output from the optical resonant cavity (3) are separated after passing through the dichroic mirror (15), and the separated fundamental frequency light and the separated frequency doubling light are respectively reflected by the fundamental frequency light reflecting mirror (16) and the frequency doubling light reflecting mirror (17), then return to the dichroic mirror (15), and then return to the optical resonant cavity (3) after passing through the primary path of the dichroic mirror (15).
8. The miniaturized compressed source generating device according to claim 1, wherein one side of the dichroic mirror (15) near the optical resonant cavity (3) is anti-reflection to the frequency doubling light, the fundamental light is highly anti-reflection, and the other side is anti-reflection to the frequency doubling light.
9. The miniaturized compressed source generating device according to claim 8, wherein the transmittance of the dichroic mirror (15) near the optical resonant cavity (3) for the frequency doubled light is greater than 97%, the reflectance for the fundamental frequency light is greater than 99.9%, and the reflectance for the other frequency doubled light is less than 0.5%.
10. A miniaturized compressed source generating device according to claim 1, characterized in that the laser source (1), the optical isolation device (2), the optical resonator (3) and the optical reflection device (4) are fixed on a conveniently movable optical isolation platform (5).
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| CN114361922A (en) * | 2021-12-17 | 2022-04-15 | 济南量子技术研究院 | All-fiber bright compressed light source based on optical parameter down-conversion |
| CN115683365A (en) * | 2022-12-28 | 2023-02-03 | 安徽鲲腾量子科技有限公司 | Tunable quantum beat frequency interference device based on quantum frequency up-conversion |
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