CN103869462B - A kind of optical cavity ring-down technology that utilizes carries out splicing the device that mirror is total to phase control - Google Patents
A kind of optical cavity ring-down technology that utilizes carries out splicing the device that mirror is total to phase control Download PDFInfo
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- CN103869462B CN103869462B CN201410123961.1A CN201410123961A CN103869462B CN 103869462 B CN103869462 B CN 103869462B CN 201410123961 A CN201410123961 A CN 201410123961A CN 103869462 B CN103869462 B CN 103869462B
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Abstract
The invention discloses a kind of optical cavity ring-down technology that utilizes to carry out splicing the device that mirror is total to phase control.Comprise laser instrument, pattern match optical device, at least one piece of catoptron, plus lens, photodetector, function generator, capture card and computing machine.This device will be converted into by the detection of splicing the optical resonator ring-down time that mirror forms the detection of splicing mirror phase place, by the ring-down time regulating the sub-mirror inclination of splicing and translation to improve optical resonator, realize the common phase control to splicing mirror.
Description
Technical field
The invention belongs to optical field, relate to a kind of optical cavity ring-down technology that utilizes and realize splicing the device that mirror is total to phase control.
Background technology
Optical cavity ring-down technology (CavityRing-Down, CRD) be a kind of hypersensitivity Detection Techniques, this technology does not directly measure light intensity, but the ring-down time of measuring beam in optical resonator, the wave noise of light source output power does not affect measurement result, is the simple absolute measurement techniques of a kind of device.Optical cavity ring-down technology has unrivaled advantage and application widely relative to traditional measurement method, and be suggested the rear sight having attracted world many countries researcher since the eighties in last century, application scope is also constantly expanding.Optical cavity ring-down technology has realized the spectral measurement to comprising the materials such as gas, liquid, solid, plasma, air suspended particle.Optical cavity ring-down technology is also at Trace gas detection, and in flame, the aspect such as material composition, solid film absorption, bending loss of optical fiber, plasma number of free radical, high reflection rate measurement has a wide range of applications.
In wavelength one timing, telescopical resolution improves with the bore increase of primary mirror.But bigbore single primary mirror proposes unprecedented challenge to aspects such as minute surface preparation, processing detections.The method of splicing mirror can realize the optical property of large aperture telescope, can reduce again processing cost and the cycle of mirror, for large telescope opens a new path.But, only have the image quality that can reach identical Aperture Telescope when splicing sub-mirror strict common phase position.Late 1990s so far, there has been proposed the method for multiple phase-detection altogether, such as, between the sub-mirror of splicing, adopt edge dislocation sensor, detect telescope far-field spot, optical component surface shape detects the methods such as interferometer.
To the optical resonator be made up of splicing mirror and catoptron, from optical cavity ring-down angle, the inclination of splicing sub-mirror is relevant with the optical cavity ring-down time with translation degree.When the strict common phase position of the sub-mirror of splicing, the ring-down time of optical resonator is maximum; Splice sub-mirror when not meeting common phase position, diffraction loss can be introduced in resonator cavity, reduce the ring-down time of resonator cavity.
Summary of the invention
Based on when splicing the strict common phase position of sub-mirror, the ring-down time of optical resonator is maximum; Splice sub-mirror when not meeting common phase position, diffraction loss can be introduced in resonator cavity, reduce the phenomenon of the ring-down time of resonator cavity, the present invention proposes a kind of novel optical cavity ring-down technology that utilizes to the device of splicing mirror phase control altogether.
Utilize optical cavity ring-down technology to carry out splicing the device that mirror is total to phase control, comprise laser instrument, pattern match optical device, splicing mirror, optical resonator chamber mirror, condenser lens, photodetector, function generator, data collecting card and computing machine, is characterized in that:
Described optical resonator chamber mirror at least comprises one first optical resonator chamber mirror; Also one second optical resonator chamber mirror can be comprised.Splicing mirror and optical resonator chamber mirror composition stable optical resonator cavity;
The light beam that laser instrument sends, through the modulation of pattern match optical device, incides in optical resonator;
Condenser lens, after being positioned at the first optical resonator chamber mirror, focuses on photodetector by the light beam through optical resonator chamber mirror;
Photodetector, is connected with data collecting card, and light signal is converted into electric signal;
Data collecting card, is connected with computing machine, for gathering the electric signal that photodetector exports, and data is sent to computing machine;
Computing machine, control function generator produces waveform, receives the electric signal of capture card input, is connected with splicing mirror;
Function generator, one end is connected with computing machine, and one end is connected with laser instrument in addition;
When carrying out common phase control, computing machine applies disturbance to the sub-mirror of splicing, detects the change of resonator cavity ring-down time, if ring-down time increases, applies forward disturbance next time, otherwise applies reverse disturbance.
By the distance of element or the focal length of lens in Move Mode matching optics device, the laser that laser instrument is sent is an eigenmodes of optical resonator.There are two kinds of methods can realize the pattern match of optical resonator, the first method, measure Laser Output Beam q parameter, according to Matrix optics method, when calculating meets pattern match condition, the parameter of pattern match optical system; Second method is that the state of fixed optics resonator cavity is constant, the longest for target with optical resonator ring-down time, and regulate the parameter of matching optics system, when the optical cavity ring-down time is the longest, the Mode Coupling in optical resonator is minimum, and the optical cavity ring-down time is maximum.
The optical resonator of splicing mirror and at least one piece of optical resonator chamber mirror composition is stable cavity; Optical resonator at least comprises one piece of catoptron, and when only using one piece of catoptron, catoptron is coaxial parallel with splicing mirror, forms straight chamber; When using polylith catoptron, catoptron and splicing mirror composition folded cavity.
Laser Output Beam is Gaussian beam, can be Ermy-Gaussian beam, also can be Laguerre-Gaussian beam, and the output beam of special pattern can reduce the loss of splicing sub-mirror gap.
Before plus lens is positioned at photodetector, play beams converge to the effect in photodetector photosensitive region.Computing machine needs calculating optical resonator cavity ring-down time, and defining the ring-down time τ swinging chamber that declines is that output intensity I (t) decays to initial transmission light intensity I
11/e time required time.
Splice the inclination of sub-mirror, loss that translation can change optical resonator, but splice the inclination of sub-mirror and the loss relation complexity of translation and resonator cavity, when carrying out common phase control, computing machine applies disturbance to the sub-mirror of splicing, detect the change of resonator cavity ring-down time, if ring-down time increases, apply forward disturbance next time, otherwise apply reverse disturbance.
Principle of the present invention is as follows:
For the optical resonator be made up of splicing mirror, the common phase error of splicing sub-mirror can introduce diffraction loss in resonator cavity, cause optical resonator ring-down time to reduce, only have when splicing sub-mirror at strict satisfied phase condition altogether, the ring-down time of optical resonator is the longest.Therefore in order to realize the common phase control to splicing mirror, first the present invention will splice mirror and at least one piece of catoptron composition optical resonator, the longest for target with optical resonator ring-down time, by the mode of random optimizing, regulate the inclination of the sub-mirror of splicing, translation, realize the common phase control to splicing mirror.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment light path schematic diagram of apparatus of the present invention;
Fig. 2 splices the relation simulation result between the size of translation error between mirror and ring-down time;
Fig. 3 is based on the common phase position control imitation result of random paralleling gradient descent algorithm.
Embodiment
Describe the present invention in detail below in conjunction with embodiment and accompanying drawing, but the present invention is not limited to this.
As shown in Figure 1, one utilizes optical cavity ring-down technology to splicing mirror common phase level control device, comprise laser instrument (1), pattern match optical device (2), splicing mirror (3), optical resonator mirror ((4-1) and (4-2)), condenser lens (5), photodetector (6), function generator (7), data collecting card (8), computing machine (9).
The method that employing device as shown in Figure 1 carries out splicing the common phase control of mirror is as follows:
1) splice mirror (3) to be made up of two pieces of sub-mirrors of splicing, in order to reduce to splice the loss that between sub-mirror, gap is introduced, the pattern that laser instrument (1) exports is TEM
10mould light beam;
2) see Fig. 1, optical resonator comprises one first optical resonator chamber mirror (4-1), and the first optical resonator chamber mirror (4-1) is level crossing; Also comprise one second optical resonator chamber mirror (4-2), its radius of curvature R=6 meter; Splicing mirror (3) is level crossing, the first optical resonator chamber mirror (4-1), the second optical resonator chamber mirror (4-2) and splicing mirror (3) composition hemicon-focal resonator, the i.e. long L=R/2 in chamber;
3) by the distance of element in Move Mode matching optics device (2), the beam waist be injected in optical resonator is made to be positioned on the sub-mirror minute surface of splicing, this embodiment simulates translation error size between the sub-mirror of splicing to be affected resonator cavity ring-down time, as shown in Figure 2;
4) computing machine (9) is modulated by the output power of function generator (7) to laser instrument (1), produce square-wave output signal, at the negative edge of laser power, by the laser intensity signal that capture card (8) collection photodetector (6) measures, computing machine (9) asks optical resonator ring-down time by the mode of curve, and definition ring-down time τ is that output intensity I (t) decays to initial transmission light intensity I
11/e time required time;
5) in the present embodiment, adopt random paralleling gradient descent algorithm as random control method for improving.Using the maximum control objectives as random paralleling gradient descent algorithm of ring-down time τ, utilize random paralleling gradient descent algorithm to calculate the translation error splicing sub-mirror in real time, the present embodiment simulates the control effects to the sub-mirror translation error of splicing, as shown in Figure 3.
Claims (5)
1. one kind utilizes optical cavity ring-down technology to carry out splicing the device that mirror is total to phase control, comprise laser instrument (1), pattern match optical device (2), splicing mirror (3), optical resonator chamber mirror (4), condenser lens (5), photodetector (6), function generator (7), data collecting card (8) and computing machine (9), is characterized in that:
Splicing mirror (3) and optical resonator chamber mirror (4) composition stable optical resonator cavity; Optical resonator chamber mirror comprises at least one first optical resonator chamber mirror (4-1);
The light beam that laser instrument (1) sends, through pattern match optical device (2) modulation, incides in optical resonator;
Condenser lens (5), after being positioned at the first optical resonator chamber mirror (4-1), focuses on photodetector (6) by the light beam through the first optical resonator chamber mirror (4-1);
Photodetector (6), is connected with data collecting card (8), light signal is converted into electric signal;
Data collecting card (8), is connected with computing machine (9), for gathering the electric signal that photodetector (6) exports, and data is sent to computing machine (9);
Computing machine (9), control function generator (7) produces waveform, receives the electric signal that capture card (8) inputs, and is connected with splicing mirror (3);
Function generator (7), one end is connected with computing machine (9), and one end is connected with laser instrument (1) in addition;
When carrying out common phase control, computing machine (9) applies disturbance to the sub-mirror of splicing, detects the change of resonator cavity ring-down time, if ring-down time increases, applies forward disturbance next time, otherwise applies reverse disturbance.
2. utilize optical cavity ring-down technology to carry out splicing the device that mirror is total to phase control as claimed in claim 1, it is characterized in that, described pattern match optical device (2) is the combination of positive lens, negative lens or positive lens and negative lens, and in pattern match optical device (2), at least one element can change focal length or move along laser beam transmission direction.
3. utilize optical cavity ring-down technology to carry out splicing the device of mirror altogether phase control as claimed in claim 1, it is characterized in that, described splicing mirror (3) is at least made up of two pieces of sub-mirrors of splicing, splices sub-mirror with tilting or the device of translational adjustment.
4. utilize optical cavity ring-down technology to carry out splicing the device that mirror is total to phase control as claimed in claim 1, it is characterized in that, described optical resonator comprises splicing mirror (3) and at least one piece of optical resonator chamber mirror (4);
Described optical resonator is stable cavity:
Time only with one piece of optical resonator chamber mirror, described optical resonator chamber mirror is one first optical resonator chamber mirror (4-1), and described first optical resonator chamber mirror (4-1) is coaxial parallel with splicing mirror (3), forms straight chamber;
When using polylith optical resonator chamber mirror, described optical resonator chamber mirror comprises one first optical resonator chamber mirror (4-1), and second optical resonator chamber mirror (4-2), described first optical resonator chamber mirror (4-1), the second optical resonator chamber mirror (4-2) and splicing mirror (3) composition folded cavity.
5. utilize optical cavity ring-down technology to carry out splicing the device that mirror is total to phase control as claimed in claim 1, it is characterized in that, the waveform that described function generator (7) produces is rectangular wave, and it is 5 microseconds that the high level of rectangular wave and low level continue minimum time.
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| CN107966280B (en) * | 2017-11-21 | 2021-07-06 | 华东交通大学 | Photoelectric detection system applied to spliced telescope and rapid common-phase adjustment method thereof |
| CN108845415B (en) * | 2018-04-03 | 2021-02-26 | 华东交通大学 | Coarse common-phase adjustment method and detection system applied to splicing mirror |
| CN108827596B (en) * | 2018-04-03 | 2021-06-29 | 华东交通大学 | Common-phase detection method and device applied to segmented splicing telescope |
| CN111141707A (en) * | 2019-12-25 | 2020-05-12 | 电子科技大学 | High-resolution imaging measurement method for reflectivity distribution of high-reflection optical element |
| CN113310902B (en) * | 2021-05-26 | 2023-10-03 | 中国科学院光电技术研究所 | Cavity ring-down self-adaptive optical active transverse mode matching method |
| CN114720402A (en) * | 2022-03-31 | 2022-07-08 | 中国科学院光电技术研究所 | Calibration device for composite sensing passive cavity |
| CN116385547B (en) * | 2023-06-02 | 2023-08-01 | 中国科学院云南天文台 | Astronomical telescope main mirror surface co-phase detection method, system and computer equipment |
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