CN213341067U - Device for realizing narrow linewidth output based on optical parametric oscillator - Google Patents
Device for realizing narrow linewidth output based on optical parametric oscillator Download PDFInfo
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- CN213341067U CN213341067U CN202021451974.9U CN202021451974U CN213341067U CN 213341067 U CN213341067 U CN 213341067U CN 202021451974 U CN202021451974 U CN 202021451974U CN 213341067 U CN213341067 U CN 213341067U
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Abstract
The invention discloses a device for realizing narrow linewidth output based on an optical parametric oscillator, which comprises a pulse laser, a convergent convex lens, a first parametric oscillation cavity mirror, a silver reflecting mirror, a parametric crystal, a second parametric oscillation cavity mirror, a pumping light transmission light shielding plate, a first FP etalon, a second FP etalon, a third parametric oscillation cavity mirror, a first reflecting mirror and a filter plate, wherein the first parametric oscillation cavity mirror is used for reflecting the laser; the first parametric oscillation cavity mirror, the silver reflecting mirror, the parametric crystal, the second parametric oscillation cavity mirror and the third parametric oscillation cavity mirror form an optical parametric oscillator OPO; the pump light is converged through the convex lens, loss of the pump light is reduced, the pump light is transmitted through the first parametric oscillation lens and enters the parametric crystal to generate signal light, the signal light is reflected by the second parametric oscillation lens, filtering and line width narrowing are carried out through the combined FP etalon, then the signal light is transmitted and reflected through the third parametric oscillation lens, the transmission part is output as the signal light, and the reflected light is used as resonant signal light of the optical parametric oscillator and oscillates in the cavity.
Description
Technical Field
The invention belongs to the field of laser, and particularly relates to a device for realizing narrow linewidth output based on an optical parametric oscillator.
Background
With the continuous improvement of nonlinear material crystal technology, high-performance optical parametric oscillators are realized. The optical parametric oscillator has the advantages of small size, good stability, high energy, large adjustment range and the like, so that the optical parametric oscillator is widely researched. The near-infrared band has important application in the fields of atmospheric monitoring, missile defense, communication and the like, so that the research on the optical parametric oscillator of the near-infrared band is always a hot spot.
The research on the optical parametric oscillator is from the aspects of a pumping source, a nonlinear crystal material, an optimized oscillation cavity and the like, but the line width of the output signal light cannot meet the practical application to a certain extent, so the research on the narrow line width output of the parametric oscillator in the near infrared band is also one direction. The narrower the line width of the output signal light, the smaller the corresponding light spot, the higher the energy, the longer the transmission distance, and the wider the application in many fields. The invention aims at improving the line width problem of output signal light of a near-infrared band, can realize the output of the narrow line width of the near-infrared band by carrying out different combinations of temperature regulation and intracavity filtering on a nonlinear crystal, and has the characteristics of easy regulation and high controllability.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a device for realizing narrow linewidth output based on an optical parametric oscillator, and the method has the advantages of narrow output signal light and high energy.
The technical scheme is as follows: the invention discloses a device for realizing narrow linewidth output based on an optical parametric oscillator, which comprises the following specific steps:
the device comprises a pulse laser, a convergent convex lens, a first parametric oscillation cavity mirror, a silver mirror, a parametric crystal, a second parametric oscillation cavity mirror, a pumping light transmission light shielding plate, a first FP etalon, a second FP etalon, a third parametric oscillation cavity mirror, a first reflector and a filter plate.
The first parametric oscillation cavity mirror, the silver reflecting mirror, the parametric crystal, the second parametric oscillation cavity mirror and the third parametric oscillation cavity mirror form an optical parametric oscillator OPO.
The pump light is converged through the convex lens, loss of the pump light is reduced, the pump light is transmitted through the first parametric oscillation lens and enters the parametric crystal to generate signal light, the signal light is reflected by the second parametric oscillation lens, filtering and line width narrowing are carried out through the combined FP etalon, then the signal light is transmitted and reflected through the third parametric oscillation lens, the transmission part is output as the signal light, and the reflected light is used as resonant signal light of the optical parametric oscillator and oscillates in the cavity.
The parametric crystal is MgO-PPLN (magnesium oxide doped periodically poled lithium niobate crystal) crystal, and the end face of the parametric crystal is vertical to the pump light, so that the resonant cavity is optimized, and better signal light output power is obtained.
YAG laser source is adopted as the pump light, the output pump light pulse width is 23ns, the wavelength is 1064nm, and a laser with wider pulse is adopted to improve the light conversion efficiency.
45 is describedOThe 1550nm high-reflection and 97% high-transmission characteristics of the cavity mirror are that the cavity mirror has high reflection of nearly 100% and high transmission of 1064nm, and since pump light generates signal light around 1.5um and residual pump light after passing through the crystal and needs to be separated, 45 is adoptedOThe cavity mirror separates and continuously oscillates the signal light.
The third parametric oscillation cavity is parallel to the collimation optical path, 80% of 1550nm is high-reflection, 97% of 1064nm is high-transmission, and as the third oscillation cavity selects 80% of signal light, part of signal light is transmitted and output, and the reflected signal light oscillates in the OPO cavity.
The first FP etalon 2mm double-sided polishing silicon chip is selected as the FP tool with narrow line width because the silicon chip has small absorption in the near infrared wave band.
The second FP etalon 500um double-sided polishing silicon chip and the first FP etalon are combined into a combined etalon.
The parametric crystal periodically polarizes the magnesium-doped lithium niobate crystal (MgO: PPLN), and two end faces are plated with 99% high-transmittance films 1064nm and 1550nm, and the matching period is 29.64 um.
The 100um double-sided polishing silicon wafer of the filter is selected according to frequency doubling light generated by the frequency doubling characteristic of the crystal because the 100um thick silicon wafer has the total reflection characteristic for light with the wavelength less than 800 nm.
The basic principle of the invention is as follows: firstly, a transmission performance test is carried out on a combined FP tool of the intracavity filter to obtain the optimal transmission wavelength, then the temperature of the nonlinear crystal is adjusted to enable the pump light to carry out wavelength conversion through the nonlinear crystal to obtain signal light with the optimal transmission wavelength, and the obtained signal light passes through the filter of the FP tool and the narrowing of the line width to enable the FP tool to output signal light with a single narrow line width.
Has the advantages that: according to the device for realizing narrow linewidth output based on the optical parametric oscillator, the silicon wafers FP with different thicknesses are inserted into the parametric oscillation cavity for combination, frequency-selective filtering of signal light and further narrowing of linewidth are realized, and the device has a wide application scene. The method has the advantages of easy tuning, low cost and high controllability, and avoids the limitation of poor tunability of the lens coated with the dielectric film.
Drawings
FIG. 1 is a schematic diagram of the optical path of the system of the present invention.
FIG. 2 is a transmission spectrum of a 2mm crystal silicon wafer.
FIG. 3 is a transmission spectrum of a 500um crystal silicon wafer.
FIG. 4 is a transmission spectrum of a 2mm and 500um combined crystal silicon wafer.
FIG. 5 is a spectrum diagram of an output signal without a silicon chip in the cavity.
FIG. 6 is a spectrum diagram of the output signal of double-side polished crystal silicon with 2mm and 500um inserted into the cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Fig. 1 is a schematic diagram of an optical path of a device for realizing narrow-linewidth output based on an optical parametric oscillator of the present invention, which is known from the figure and comprises a pulse laser 1, a converging convex lens 2, a first parametric oscillation cavity mirror 3, a silver mirror 4, a parametric crystal 5, a second parametric oscillation cavity mirror 6, a first FP etalon 7, a second FP etalon 8, a third parametric oscillation cavity mirror 9, a first reflecting mirror 10 and a filter 11, wherein the pump light transmission light shielding plate 12 has the following characteristics:
YAG laser, the output pump light pulse width is 23ns, the wavelength is 1064 nm;
the converging convex lens 2 of the embodiment is f-15 cm and is plated with an antireflection film of 1064 nm;
the first parametric oscillation cavity mirror 3 and the second parametric oscillation cavity mirror 6 of this embodiment are plated with a 1064nm antireflection film and a 1550nm high reflection film;
the silver mirror 4 of the present embodiment is a 1550nm full mirror;
the parametric crystal 5 of this embodiment is MgO PPLN, which has a period of 29.64 um; the parameter crystal periodically polarizes the magnesium-doped lithium niobate crystal (MgO: PPLN), two end faces are plated with 99% high-transmittance films 1064nm and 1550nm, the matching period is 29.64um, the selected crystal has the characteristics of wide transmission spectrum range, higher optical damage threshold and low manufacturing difficulty, and the size of the adopted crystal is 50mm in length, X in width and X in height, namely 50mm X3mm X4 mm.
In the embodiment, the first FP etalon 7 and the second FP etalon 8 are both non-plated films, and two sides of a silicon wafer are polished to be 2mm and 500um in thickness respectively; the transmission line of the first FP etalon 7 is as shown in fig. 2, the transmission line of the second FP etalon 8 is as shown in fig. 3, and the transmission line of the combined etalon composed of the first FP etalon 7 and the second FP etalon 8 is as shown in fig. 4.
The third parametric oscillation cavity mirror 9 of this embodiment is plated with an antireflection film of 1064nm and a partial reflection film having a reflectivity of 80% at 1550 nm;
the first reflector 10 of this embodiment is plated with an antireflection film of 1064nm and a high reflection film of 1550 nm;
the filter 11 of the present embodiment is a 100um double-side polished silicon wafer;
the positional relationship of the above elements is as follows:
follow pulse laser 1 output pump light direction loop through convex lens 2 and first parametric oscillation chamber mirror 3, the pump light passes through first parametric oscillation chamber mirror 3 transmission and gets into the OPO resonant cavity, through carrying out temperature tuning to parametric crystal 5, make the pump light pass through the parametric crystal and produce near 1.5um signal light, remaining pump light passes through second parametric oscillation chamber mirror 6 transmission OPO chamber in the light beam, near 1.5um signal light loops through second parametric oscillation chamber mirror 6, the combination etalon of first FP etalon 7 and second FP etalon 8 constitution carries out the frequency selection filtering, at the partial transmission output of third parametric oscillation chamber mirror 9, the reverberation is as optical parametric oscillator resonant signal light, oscillate in the OPO intracavity.
The part of the output signal light transmitted by the third parametric oscillation cavity mirror 9 contains little pump light, frequency doubling light generated by the pump light and the signal light is red light near 532nm and 750nm respectively. And secondary filtering is carried out through a 100um double-side polished silicon wafer, so that the output of single signal light is achieved.
The invention discloses a device for realizing narrow linewidth output based on an optical parametric oscillator. Based on a 1064nm pulse laser source, the device adopts the innovative combination of a double-FP etalon and an optical parametric oscillator, and can obtain narrow line width output (about 0.03nm) near 1.5um by combining nonlinear crystal temperature regulation and FP etalon filtering in the optical parametric oscillator as shown in figure 6. The silicon chip is used as an FP tool near 1.5um, a single FP tool can realize the output of narrow line width of 0.05nm, the double FP tools are used, the narrow line width is further narrowed to 0.03nm, and the method has the advantages of easy tuning, low cost and high controllability.
Claims (8)
1. The utility model provides a device based on optical parametric oscillator realizes narrow linewidth output which characterized in that: the laser comprises a pulse laser (1), a converging convex lens (2), a first parametric oscillation cavity mirror (3), a reflective silver mirror (4), a parametric crystal (5), a second parametric oscillation cavity mirror (6), a first FP etalon (7), a second FP etalon (8), a third parametric oscillation cavity mirror (9), a first reflector (10), a filter plate (11) and a pump light transmission light shielding plate (12);
the first parametric oscillation cavity mirror (3), the reflective silver mirror (4), the parametric crystal (5), the second parametric oscillation cavity mirror (6) and the third parametric oscillation cavity mirror (9) form an optical parametric oscillator OPO;
the transmission direction of the pump light sequentially passes through the converging convex lens (2), the first parametric oscillation cavity mirror (3), the parametric crystal (5) and the second parametric oscillation cavity mirror (6) to reach the pump light transmission light shielding plate (12), the pump light is transmitted through the first parametric oscillation cavity mirror (3) to enter the optical parametric oscillator, the pump light passes through the parametric crystal (5), and a part of the pump light is converted into signal light;
the edge signal light and remaining pump light pass through second parametric oscillation chamber mirror (6), remaining pump light forms first transmitted light through second parametric oscillation chamber mirror (6), signal light forms first reverberation through second parametric oscillation chamber mirror (6), first reverberation light is through the combination filtering of first FP etalon (7), second FP etalon (8), form second transmission light and second reverberation through third parametric oscillation chamber mirror (9), the output signal light of second transmission light as optical parametric oscillator, the second reverberation is as optical parametric oscillator resonance signal light, oscillate in optical parametric oscillator OPO resonant cavity.
2. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: the pumping light of the pulse laser (1) adopts an Nd: YAG laser source, the output wavelength is 1064nm, and the pulse width is 23 ns.
3. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: the first parametric oscillation cavity mirror (3), the second parametric oscillation cavity mirror (6) and the first reflecting mirror (10) adopt 45 DEG COAnd the mirror is coated with a 1550nm high reflection film and a 1064nm antireflection film.
4. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: and the third parametric oscillation cavity mirror (9) is plated with a reflecting film with 1550nm reflectivity of 80% and an antireflection film with 1064 nm.
5. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: the first FP etalon (7) adopts a double-sided polished silicon chip with the thickness of 2 mm.
6. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: the second FP etalon (8) adopts a double-sided polished silicon wafer with the thickness of 500 um.
7. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: the parametric crystal (5) is a magnesium oxide doped periodically poled lithium niobate crystal.
8. The apparatus of claim 1, wherein the apparatus for narrow linewidth output based on the optical parametric oscillator comprises: the filter (11) adopts a double-sided polished silicon wafer with the thickness of 100 um.
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| CN202021451974.9U CN213341067U (en) | 2020-07-22 | 2020-07-22 | Device for realizing narrow linewidth output based on optical parametric oscillator |
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| CN202021451974.9U CN213341067U (en) | 2020-07-22 | 2020-07-22 | Device for realizing narrow linewidth output based on optical parametric oscillator |
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