CN112054378A - Optical parametric oscillation device with intracavity compensation and spectrometer - Google Patents
Optical parametric oscillation device with intracavity compensation and spectrometer Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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Abstract
The invention discloses an optical parametric oscillation device and a spectrometer with intracavity compensation, wherein the optical parametric oscillation device comprises: an optical resonant cavity comprising a plurality of cavity mirrors; the optical resonant cavity is used for inputting pump light; a nonlinear crystal located within the optical resonant cavity, the nonlinear crystal to form a signal light and an idler light based on the pump light; the idler frequency light is led out of the optical resonant cavity through one cavity mirror; part of the signal light is led out of the resonant cavity through the other cavity mirror; an optical frequency reference for generating a control signal based on the signal emitted by the optical resonator; an electro-optic crystal located within the optical resonator; the electro-optic crystal is used for adjusting the frequency of the signal light based on the control signal. By applying the technical scheme provided by the invention and utilizing the thought of intracavity compensation, the line width of the signal light and the idler frequency light can be effectively narrowed, and narrow line width output is realized.
Description
Technical Field
The invention relates to the technical field of laser, in particular to an optical parametric oscillation device with intracavity compensation and a spectrometer.
Background
Optical parametric oscillation is one of the important methods of the current infrared laser technology, and is widely applied to spectrum detection. The continuous optical parametric oscillation method has great application potential due to the advantages of stable output power, large-range tuning of the wavelength of the emergent light and the like.
At present, the main idea of the optical parametric oscillation method is to guide out signal light in an optical parametric oscillator, lock the signal light on a stable external optical cavity, and compensate the change of the optical cavity mode wavelength of the optical parametric oscillator by adjusting the optical cavity length of the optical parametric oscillator. However, with this method, the compensation signal is loaded on the cavity mirror of the optical parametric oscillator, and is limited by the bandwidth, and cannot realize fast compensation, and it is difficult to obtain an extremely narrow output optical line width.
Disclosure of Invention
In view of this, the present invention provides an intracavity compensated optical parametric oscillation device and a spectrometer, which can effectively narrow the line widths of signal light and idler frequency light by using the concept of intracavity compensation, thereby realizing narrow line width output.
In order to achieve the above purpose, the invention provides the following technical scheme:
an intracavity compensated optical parametric oscillation device, the optical parametric oscillation device comprising:
an optical resonant cavity comprising a plurality of cavity mirrors; the optical resonant cavity is used for inputting pump light and realizing the multiple reflection enhancement of signal light;
a nonlinear crystal located within the optical resonant cavity, the nonlinear crystal to form a signal light and an idler light based on the pump light; the idler frequency light is led out of the optical resonant cavity through one cavity mirror; after the signal light is subjected to resonant amplification in the optical resonant cavity, part of the signal light is led out of the optical resonant cavity through the other cavity mirror;
an optical frequency reference for generating a control signal based on the signal emitted by the optical resonator;
an electro-optic crystal located within the optical resonator; the electro-optic crystal is used for adjusting the frequency of the signal light based on the control signal.
Preferably, in the above optical parametric oscillation device, the optical resonator has four of the cavity mirrors; the four cavity mirrors are sequentially a first cavity mirror to a fourth cavity mirror;
the first cavity mirror is used for incidence of the pump light and reflecting the signal light; the second cavity mirror is an idler frequency light guide mirror and is used for leading out the idler frequency light and reflecting the signal light; the third cavity mirror is a signal light guide mirror and can guide out part of the signal light after resonance amplification;
the nonlinear crystal is positioned between the light propagation paths of the first cavity mirror and the second cavity mirror;
the electro-optical crystal is positioned between the light propagation paths of the third cavity mirror and the fourth cavity mirror.
Preferably, in the optical parametric oscillation device, all the cavity mirrors are dichroic mirrors;
the reflectivity of the first cavity mirror, the second cavity mirror and the fourth cavity mirror to the signal light is more than 99%;
the reflectivity of the third cavity mirror to the signal light is larger than 97%.
Preferably, in the above optical parametric oscillation device, the nonlinear crystal and the electro-optical crystal are respectively located in separate temperature controlled furnaces.
Preferably, in the above optical parametric oscillation device, two opposite current-carrying end faces of the electro-optical crystal are provided with metal coatings for realizing electrical conductivity;
and the light-transmitting end faces of the electro-optical crystal are provided with antireflection films of the signal light.
Preferably, in the above optical parametric oscillation device, the electro-optical crystal is a magnesium oxide-doped lithium niobate electro-optical crystal.
Preferably, in the above optical parametric oscillation device, the electro-optical crystal has a cut angle set so that the signal light is incident on the electro-optical crystal at brewster's angle.
Preferably, in the above optical parametric oscillation device, the optical frequency reference is used to generate a reference signal, and the control signal is generated based on a frequency comparison result between the reference signal and the reference signal.
Preferably, in the above optical parametric oscillation device, the reference signal includes: any one of an atomic absorption signal, a molecular absorption signal, and an optical cavity signal.
The invention also provides a spectrometer comprising the optical parametric oscillation device.
As can be seen from the above description, in the optical parametric oscillation device and the spectrometer with intracavity compensation provided in the technical scheme of the present invention, the electro-optic crystal is inserted into the optical resonant cavity to perform fast and efficient feedback control, the idea of intracavity compensation is utilized to realize fast locking of the signal light and the optical frequency reference, and the control signal generated by the optical frequency reference is loaded on the electro-optic crystal, so that the compensation bandwidth is greatly increased, the frequency noise of the signal light and the line width of the signal light are greatly reduced, and thus the line widths of the signal light and the idler light are effectively narrowed, and narrow line width output is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention.
Fig. 1 is a top view of an intracavity compensated optical parametric oscillation device according to an embodiment of the present invention;
fig. 2 is a signal optical line width measurement diagram of the intracavity compensated optical parametric oscillation device according to the embodiment of the present invention.
Detailed Description
Embodiments of the present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the application are shown, and in which it is to be understood that the embodiments described are merely illustrative of some, but not all, of the embodiments of the application. 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 application.
Optical parametric oscillation is one of the important methods of the current mid-infrared laser technology, and is widely applied to spectrum detection. The continuous optical parametric oscillation method has great application potential due to the advantages of stable output power, large-range tuning of the wavelength of the emergent light and the like. In the application of the current optical parametric oscillation method, there are major problems including: the width of the emergent light line is wide.
In the prior art, the main idea of the optical cavity locking narrow linewidth technology is to guide out signal light in an optical parametric oscillator, lock the signal light on a stable external optical cavity, and compensate the change of the optical cavity mode wavelength of the optical parametric oscillator by adjusting the optical cavity length of the optical parametric oscillator. However, with this method, the compensation signal is loaded on the cavity mirror of the optical parametric oscillator, and is limited by the bandwidth, and cannot realize fast compensation, and it is difficult to obtain an extremely narrow output optical line width.
The main idea of the output optical linewidth technology of the narrowing optical parametric oscillator is to guide out the idler frequency light in the optical parametric oscillator, lock the idler frequency light on a stable outer optical cavity, and compensate the change of the optical cavity mode wavelength of the optical parametric oscillator by adjusting the pumping photocurrent of the optical parametric oscillator. However, the method is very dependent on the selection and use of the pump laser, greatly limits the application of the optical parametric oscillator, and is not suitable for the pulsed optical parametric oscillator.
Therefore, in order to solve the above problems, the present invention provides an intracavity compensated optical parametric oscillation device and a spectrometer, the optical parametric oscillation device comprising:
an optical resonant cavity comprising a plurality of cavity mirrors; the optical resonant cavity is used for inputting pump light;
a nonlinear crystal located within the optical resonant cavity, the nonlinear crystal to form a signal light and an idler light based on the pump light; the idler frequency light is led out of the optical resonant cavity through one cavity mirror; after the signal light is subjected to resonant amplification in the optical resonant cavity, part of the signal light is led out of the optical resonant cavity through the other cavity mirror;
an optical frequency reference for generating a control signal based on the signal emitted by the optical resonator;
an electro-optic crystal located within the optical resonator; the electro-optic crystal is used for adjusting the frequency of the signal light based on the control signal.
As can be seen from the above description, in the optical parametric oscillation device and the spectrometer with intracavity compensation provided in the technical scheme of the present invention, the electro-optic crystal is inserted into the optical resonant cavity to perform fast and efficient feedback control, the idea of intracavity compensation is utilized to realize fast locking of the signal light and the optical frequency reference, and the control signal generated by the optical frequency reference is loaded on the electro-optic crystal, so that the compensation bandwidth is greatly increased, the frequency noise of the signal light and the line width of the signal light are greatly reduced, and thus the line widths of the signal light and the idler light are effectively narrowed, and narrow line width output is realized.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, fig. 1 is a top view of an intracavity compensated optical parametric oscillation device according to an embodiment of the present invention. As shown in fig. 1, the optical parametric oscillation device includes:
an optical resonant cavity 11, the optical resonant cavity 11 comprising a plurality of cavity mirrors; the optical resonant cavity 11 is used for inputting pump light and realizing multiple reflection enhancement of signal light;
a nonlinear crystal 12 located within the optical resonant cavity 11, the nonlinear crystal 12 for forming a signal light and an idler light based on the pump light; the idler frequency light is led out of the optical resonant cavity 11 through one cavity mirror; after the signal light is subjected to resonant amplification in the optical resonant cavity 11, part of the signal light is guided out of the optical resonant cavity 11 through the other cavity mirror; the nonlinear crystal 12 and the pump light and the idler frequency light realize quasi-phase matching, so that the pump light and the signal light generate nonlinear interaction to convert and generate the idler frequency light and form optical parametric oscillation;
an optical frequency reference 13, said optical frequency reference 13 being adapted to generate a control signal based on said signal emitted by said optical resonator 11;
an electro-optic crystal 14 located within the optical cavity 11; the electro-optic crystal 14 is used for adjusting the frequency of the signal light based on the control signal. The electro-optical crystal 14 is arranged in the optical parametric oscillation cavity 11, and can also perform rapid compensation on the optical phase of the signal in the optical parametric oscillation cavity 11.
In the embodiment of the present invention, the pump light enters the nonlinear crystal 12 through one cavity mirror of the optical cavity resonator 11 to form the signal light and the idler light, the idler light is guided out of the optical cavity resonator 11 through one cavity mirror, after the signal light is resonantly amplified in the optical cavity resonator 11, a part of the signal light is guided out of the optical cavity resonator 11 through the other cavity mirror, enters the optical frequency reference 13, a control signal is generated, and the control signal is loaded on the electro-optical crystal 14, so that the change of the signal light frequency can be compensated rapidly and efficiently, and the signal light and the idler light with narrow line width can be obtained.
The nonlinear crystal 12 realizes the function of nonlinear phase matching through special doping, and no voltage is applied to the nonlinear crystal 12. The electro-optic crystal 14 is a commonly doped nonlinear crystal of other types to achieve the function of increasing the threshold of optical damage, and the frequency of the electro-optic crystal 14 needs to be adjusted through voltage.
Compared with the prior art, the intracavity compensated optical parametric oscillation device provided by the invention realizes the rapid locking of the signal light and the optical frequency reference by utilizing the intracavity compensation idea, and loads the control signal generated by the optical frequency reference 13 on the electro-optical crystal 14, so that the compensation bandwidth is greatly increased, the frequency noise of the signal light and the line width of the signal light are greatly reduced, the line widths of the signal light and the idler frequency light are effectively narrowed, and the narrow line width output is realized.
In the manner shown in fig. 1, the optical resonator 11 has four of the cavity mirrors; the four cavity mirrors are a first cavity mirror 15, a second cavity mirror 16, a third cavity mirror 17 and a fourth cavity mirror 18 in sequence; the first cavity mirror 15 is used for incidence of the pump light and reflection of the signal light; the second cavity mirror 16 is an idler frequency light guide mirror, and is used for deriving the idler frequency light and reflecting the signal light; the third cavity mirror 17 is a signal light guide mirror, and can guide out part of the signal light after resonance amplification; the nonlinear crystal 12 is positioned between the light propagation paths of the first cavity mirror 15 and the second cavity mirror 16; the electro-optic crystal 14 is located between the light propagation paths of the third 17 and fourth 18 cavity mirrors.
In the illustration of fig. 1, the solid arrows between the fourth mirror 18 and the optical frequency reference 13 represent light propagation and the dashed arrows represent control signals.
It should be noted that the number of the mirrors in the optical resonant cavity 11 can be set based on the requirement, and is not limited to four cavity mirrors in this application.
In the technical scheme of the invention, pump light enters the nonlinear crystal 12 through the first cavity mirror 15 to generate idler frequency light and signal light, the signal light is subjected to resonant amplification in a butterfly-shaped resonant cavity formed by the first cavity mirror 15, the second cavity mirror 16, the third cavity mirror 17 and the fourth cavity mirror 18, the idler frequency light is led out from the second cavity mirror 16, part of the signal light is led out from the third cavity mirror 17 and enters the optical frequency reference 13 to generate an error signal and a feedback control signal, the feedback control signal is loaded on the electro-optic crystal 14, the change of the frequency of the signal light can be rapidly and efficiently compensated, and the signal light with narrow line width can be obtained.
Further, all the cavity mirrors are dichroic mirrors; the reflectivity of the first cavity mirror 15, the second cavity mirror 16 and the fourth cavity mirror 18 to the signal light is more than 99%; the reflectivity of the third cavity mirror 17 to the signal light is greater than 97%. The dichroic mirror is highly reflective to signal light and transmissive to idler light and pump light.
In the embodiment of the present invention, the four cavity mirrors are butterfly-shaped cavity mirrors, wherein the first cavity mirror 15 and the second cavity mirror 16 are flat concave mirrors, the concave surfaces of the flat concave mirrors point to the inside of the optical resonant cavity 11, and the third cavity mirror 17 and the fourth cavity mirror 18 are plane mirrors. The four cavity mirrors are required to form a stable resonant cavity for the signal light, the substrates of the four cavity mirrors are all made of materials with high transmission for the pumping light and the idler frequency light, wherein the coating of the first cavity mirror 15, the second cavity mirror 16 and the fourth cavity mirror 18 is required to have a reflectivity of more than 99% for the signal light, a high transmission rate is shown for the wave bands of the pumping light and the idler frequency light, the coating of the third cavity mirror 17 is required to have a reflectivity of more than 97% for the signal light, a high transmission rate is shown for the wave bands of the pumping light and the idler frequency light, and the function of the coating is to enable the signal light to be stably resonated and amplified in the optical.
In the embodiment of the present invention, 1064nm laser is taken as pump light, 1750nm laser is taken as signal light, and signal light line width measurement is given as shown in fig. 2, where fig. 2 is a signal light line width measurement diagram of an intracavity compensated optical parametric oscillation device provided in the embodiment of the present invention. In the mode of fig. 2, 21 is a measurement point, 22 is an analog line, and the horizontal axis represents a relative frequency (khz), and it can be seen from fig. 2 that the laser line width obtained by the intracavity compensated optical parametric oscillation device of the present invention is 20 khz.
The cavity mirror, namely the coated dichroic mirror, of the invention is highly reflective to the signal light wave band and transmissive to the idler frequency light and the pumping light, and the pumping light and the idler frequency light pass through the cavity mirror and the nonlinear crystal 12 in a single time, thereby realizing quasi-phase matching.
In the embodiment of the invention, the nonlinear crystal 12 and the electro-optic crystal 14 are respectively positioned in separate temperature control furnaces. The temperature control furnace is used for controlling the temperature of the nonlinear crystal 12 and the electro-optic crystal 14 to realize the control of the frequency of signal light, the electro-optic crystal 14 is arranged in the temperature control furnace, and has better temperature stability, and the typical temperature stability is that the temperature fluctuation is less than 10 mK.
The electro-optic crystal 14 is a polyhedron, such as may be a cube. Two opposite surfaces of the electro-optical crystal 14 serve as two light-passing ends, and the other two opposite surfaces serve as power-passing ends.
The light-transmitting end faces of the electro-optic crystal 14 are provided with antireflection films for the signal light. The light-transmitting end faces are the left end and the right end of the electro-optic crystal 14 in the figure 1, and the transmissivity of the antireflection film is more than 99%.
Two opposite electrified end faces of the electro-optical crystal 14 are provided with metal coatings for realizing conductivity. The electro-optical crystal 14 can also be an electro-optical crystal with a film plated at the electrifying end, the film layer at the electrifying end has good electric conductivity and preferable characteristics and length, rapid and efficient compensation of signal light phase in the optical cavity can be realized, the electro-optical crystal 14 has high refractive index stability to signal light, and the typical fluctuation of the refractive index stability is less than 0.1%.
In the embodiment of the present invention, the selection of the coating film at the light-transmitting end of the electro-optical crystal 14 can realize low insertion loss of the signal light in the optical resonant cavity 11, the selection of the length and the characteristics thereof can realize rapid and efficient phase and frequency compensation of the signal light, the control of the refractive index stability of the electro-optical crystal 14 can ensure the stable operation of the optical parametric oscillation device, and the temperature control of the electro-optical crystal 14 can realize small amplitude modulation of the signal light.
In the embodiment of the present invention, the polarization direction of the electro-optical crystal 14 has higher consistency with the polarization direction of the nonlinear crystal 12 in the optical parametric oscillation cavity 11, and the stability of the signal light amplitude can be ensured.
The electro-optical crystal 14 may be a magnesium oxide doped lithium niobate electro-optical crystal. The electro-optical crystal 14 has a high transmittance for the signal light, and its refractive index can be modulated by an electrical signal, thereby compensating for the change in the frequency of the signal light.
In the embodiment of the present invention, the electro-optical crystal 14 has a set cut angle, so that the signal light is incident to the electro-optical crystal 14 at the brewster angle, and high transmittance of the signal light is achieved. The cut angle may be the angle between the long axis of the electro-optic crystal 14 and the horizontal in figure 1.
The device of the invention gives full play to the idea of fast compensation in the optical parametric oscillation cavity, a dichroscope is used as a cavity mirror to form a stable optical parametric oscillation cavity 11, pumping light enters the optical parametric oscillation cavity 11 through a first cavity mirror 15, and acts with a nonlinear crystal 12 to generate signal light and idler light, the idler light is led out from a second cavity mirror 16, part of the signal light is led out from a third cavity mirror 17 and enters an optical frequency reference 13 to generate a control signal, and the control signal is loaded on an electro-optical crystal 14, so that the fast and efficient compensation of the frequency of the signal light can be realized, the control of the frequency of the idler light is realized, and the narrow linewidth output is realized.
In the embodiment of the present invention, the optical frequency reference 13 is configured to generate a reference signal, and generate the control signal based on a frequency comparison result between the reference signal and the reference signal.
Further, the reference signal may include: any one of an atomic absorption signal, a molecular absorption signal, and an optical cavity signal. The signal light is guided out of the optical cavity 11 and enters the optical frequency reference 13, and the frequency of the signal light is compared with the frequency of the optical frequency reference 13 to generate control signals, namely an error signal and a feedback control signal.
It should be noted that the optical frequency reference 13 may be any frequency reference such as an atomic molecular absorption line, an optical reference cavity, an optical frequency comb, and the like.
As can be seen from the above description, in the optical parametric oscillation device with intracavity compensation provided by the technical scheme of the present invention, the compensation method of the electro-optical crystal is added in the optical resonant cavity, the electro-optical crystal is inserted into the optical resonant cavity to perform fast and efficient feedback control, the fast locking of the signal light and the optical frequency reference is realized by using the intracavity compensation idea, and the control signal generated by the optical frequency reference is loaded on the electro-optical crystal, so that the compensation bandwidth is greatly increased, the frequency noise of the signal light and the line width of the signal light are greatly reduced, and thus the line widths of the signal light and the idler light are effectively narrowed, and the narrow line width output is realized.
The optical parametric oscillation device adopting the intracavity compensation can be used for continuous type and pulse type optical parametric oscillation devices according to the thought and the technology.
Based on the above description of the embodiments, another embodiment of the present invention further provides a spectrometer, which includes the optical parametric oscillation device described in the above embodiments. The spectrometer adopts the intracavity compensated optical parametric oscillation device described in the above embodiment, and can effectively narrow the line widths of the signal light and the idler frequency light, thereby realizing narrow line width output.
The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the spectrometer disclosed in the embodiment, since it corresponds to the optical parametric oscillation device disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the partial description of the optical parametric oscillation device.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An intracavity compensated optical parametric oscillation device, comprising:
an optical resonant cavity comprising a plurality of cavity mirrors; the optical resonant cavity is used for inputting pump light and realizing the multiple reflection enhancement of signal light;
a nonlinear crystal located within the optical resonant cavity, the nonlinear crystal to form a signal light and an idler light based on the pump light; the idler frequency light is led out of the optical resonant cavity through one cavity mirror; after the signal light is subjected to resonant amplification in the optical resonant cavity, part of the signal light is led out of the optical resonant cavity through the other cavity mirror;
an optical frequency reference for generating a control signal based on the signal emitted by the optical resonator;
an electro-optic crystal located within the optical resonator; the electro-optic crystal is used for adjusting the frequency of the signal light based on the control signal.
2. An optical parametric oscillation device according to claim 1, wherein the optical resonator cavity has four of the cavity mirrors; the four cavity mirrors are sequentially a first cavity mirror to a fourth cavity mirror;
the first cavity mirror is used for incidence of the pump light and reflecting the signal light; the second cavity mirror is an idler frequency light guide mirror and is used for leading out the idler frequency light and reflecting the signal light; the third cavity mirror is a signal light guide mirror and can guide out part of the signal light after resonance amplification;
the nonlinear crystal is positioned between the light propagation paths of the first cavity mirror and the second cavity mirror;
the electro-optical crystal is positioned between the light propagation paths of the third cavity mirror and the fourth cavity mirror.
3. The optical parametric oscillation device of claim 2, wherein all of the cavity mirrors are dichroic mirrors;
the reflectivity of the first cavity mirror, the second cavity mirror and the fourth cavity mirror to the signal light is more than 99%;
the reflectivity of the third cavity mirror to the signal light is larger than 97%.
4. The optical parametric oscillation device of claim 1, wherein the nonlinear crystal and the electro-optic crystal are each located in a separate temperature controlled oven.
5. The optical parametric oscillation device according to claim 1, wherein both of the opposite energized end faces of the electro-optical crystal have a metal coating for realizing electrical conductivity;
and the light-transmitting end faces of the electro-optical crystal are provided with antireflection films for signal light.
6. The optical parametric oscillation device of claim 1, wherein the electro-optic crystal is a magnesium oxide doped lithium niobate electro-optic crystal.
7. The optical parametric oscillation device of claim 1, wherein the electro-optic crystal has a cut angle set such that the signal light is incident on the electro-optic crystal at brewster's angle.
8. The optical parametric oscillation device of claim 1, wherein the optical frequency reference is used to generate a reference signal, and the control signal is generated based on a frequency comparison of the reference signal and the reference signal.
9. The optical parametric oscillation device of claim 8, wherein the reference signal comprises: any one of an atomic absorption signal, a molecular absorption signal, and an optical cavity signal.
10. A spectrometer comprising an optical parametric oscillation device as claimed in any of claims 1 to 9.
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