DE212021000433U1 - Miniature dual-microdisk-based mid-infrared laser - Google Patents

Abstract

A double microdisk-based miniature mid-infrared laser comprising a laser source (1), a coupler (2), an echo wall microdisk laser (3), and an echo wall microdisk optical parametric oscillator (4); wherein the echo wall microdisk laser (3) and the echo wall microdisk optical parametric oscillator (4) are stacked;
wherein the coupler (2) comprises a first lens (21), a lower coupling crystal (22), an upper coupling crystal (23) and a second lens (24), and wherein the lower coupling crystal (22) and the upper coupling crystal (23) are stacked;
the first lens (21) being positioned between the laser source (1) and an incident surface (221) of the lower coupling crystal (22), the echo wall microdisk laser (3) being tangential to a lower coupling surface (222) of the lower coupling crystal (22) and the echo wall microdisk laser (3) is tangent to a top coupling surface (231) of the top coupling crystal (23), the echo wall microdisk optical parametric oscillator (4) is tangent to a top coupling surface (231) of the top coupling crystal ( 23), the second lens (24) is coupled to an output face (232) of the upper coupling crystal (23);
the laser source (1) being arranged to produce a single frequency laser which is coupled and collimated by the first lens (21) and thereafter coupled through the lower coupling crystal (22) into the echo wall microdisk laser (3), the single frequency laser after a transition to the upper energy level by the echo wall microdisc laser (3) forms pump light, which is coupled through the upper coupling crystal (23) into the echo wall microdisk optical parametric oscillator (4), wherein after resonance amplification of the pump light in the echo wall microdisk Optical parametric oscillator (4) signal light in a near-infrared band and idle frequency light in a mid-infrared band are generated, the signal light and idle frequency light sequentially passing through the upper coupling crystal (23) and the second lens (24) and then being output.

Description

TECHNICAL AREA

The present application relates to the field of mid-infrared laser technology and more particularly relates to a dual-microdisk-based miniature mid-infrared laser.

STATE OF THE ART

Mid-infrared lasers in the wavelength range of 3-5 µm are best suited for infrared spectroscopy, and hence are widely used in various fields such as medicine and biology. Moreover, due to the strong penetrating ability of the mid-infrared band laser in the atmosphere, it finds wide applications in many aspects such as weather monitoring, space optical communication, laser ranging, laser radar, laser guidance, long-distance scanning.

Among the many technical solutions for generating long-wavelength light sources in the infrared band, a near-infrared laser is used as a pumping light source and frequency down-conversion is enabled by an optical parametric effect, which is a solution for obtaining the long-wavelength infrared laser of 3-5 µm. The technical methods included are differential frequency (DF), optical parametric generation (OPG), optical parametric oscillation (OPO), and optical parametric amplifier (OPA). Compared with the DF and OPG technologies, in the OPO and OPA technologies, technical devices are simple in design, high repetition frequency and high average power output can be achieved.

Based on the above principles, patent publication number discloses CN209418978U a high-efficiency intermediate infrared continuous tunable optical parametric oscillation laser; the patent with the publication number CN106981818B discloses a nanosecond pulse optical parametric amplifier, with locking tunable midinfrared narrow line-width and sheet micro-cavity near infrared seed light injection light injection); and patent publication number CN106992426B discloses a cavity pump light parameter oscillator of single-ended output. In all the above patents, separate optical space elements such as resonator mirror, lens and reflecting mirror etc. are used to form the main components of a laser, resulting in the laser being heavy in areas because of its complex overall structure and large volume as well as heavy weight with high weight and volume requirements.

DISCLOSURE OF THE INVENTION

The present application provides a double-microdisk-based miniature mid-infrared laser that solves the problem that a laser is difficult to be used in areas requiring high weight and volume because of its complex structure of the whole, large volume and heavy weight can.

In order to solve the above problem, a technical solution is available in the present application: a double-microdisk-based miniature mid-infrared laser comprising a laser source, a coupler, an echo wall microdisk laser, and an echo wall microdisk optical parametric oscillator; wherein the echo wall microdisk laser and the echo wall microdisk optical parametric oscillator are stacked;
wherein the coupler comprises a first lens, a bottom coupling crystal, a top coupling crystal and a second lens; the lower coupling crystal and the upper coupling crystal are stacked;
wherein the first lens is provided between the laser source and an incident surface of the lower coupling crystal, the echo wall microdisk laser is tangent to a lower coupling surface of the lower coupling crystal, the echo wall microdisk laser is tangent to an upper coupling surface of the upper coupling crystal, the echo wall microdisk optical - the parametric oscillator is tangent to an upper coupling surface of the upper coupling crystal, the second lens is coupled to an output surface of the upper coupling crystal;
wherein the laser source is for generating a single-frequency laser, the single-frequency laser being coupled and collimated by the first lens and thereafter coupled through the lower coupling crystal into the echo wall microdisk laser, the single-frequency laser forming pump light after a transition to the upper energy level through the echo wall microdisk laser, wherein the pump light is coupled through the upper coupling crystal into the echo wall microdisc optical parametric oscillator after resonant amplification of the pump light in the echo wall mic rodisk optical parametric oscillator, signal light in a near infrared band and idle frequency light in a mid infrared band are generated, the signal light and the idle frequency light successively pass through the upper coupling crystal and the second lens, and thereafter are output.

As a preferred solution, the upper coupling crystal further comprises a first reflective surface and a second reflective surface; wherein the first reflective surface and the second reflective surface are both an arcuate surface;
the pump light is successively reflected from the first reflecting surface and the second reflecting surface and focused into the upper coupling crystal.

As a preferred solution, the double-microdisk-based miniature mid-infrared laser further includes a first heater plate and a second heater plate provided on two sides of the echo wall microdisk laser, respectively.

As a preferred solution, the double-microdisc-based miniature mid-infrared laser further comprises a third heater plate and a fourth heater plate provided on two sides of the echo wall microdisk optical parametric oscillator, respectively.

As a preferred solution, a neodymium-doped yttrium vanadate crystal with a thickness of 0.5 mm and a diameter of 1 mm-10 mm is used as the material of the echo wall microdisk laser.

As a preferred solution, a ferroelectric crystal is used as the material of the echo wall microdisc optical parametric oscillator.

As a preferred solution, rutile is used as the material of the lower coupling crystal and the upper coupling crystal.

As a preferred solution, a plane on which the lower coupling surface is located coincides with a plane on which the upper coupling surface is located;
wherein there is a spacing of 100 nm between the echo wall microdisc laser and the lower coupling surface; there is a distance of 100 nm between the echo wall microdisc optical parametric oscillator and the upper coupling surface.

As a preferred solution, the double-microdisk-based miniature mid-infrared laser further includes a metal case, inside the metal case is provided a heat insulating plate, the metal case is provided with a gas-tight opening for filling with nitrogen, and a wire hole for leading out an electric control wire.

In practical application, a laser source is used to generate a single-frequency laser, the single-frequency laser being coupled and collimated through the first lens and then coupled through the lower coupling crystal into the echo wall microdisk laser, the single-frequency laser pumping light through the echo wall microdisk laser after a transition to the upper energy level wherein the pump light is coupled into the echo wall microdisc optical parametric oscillator through the upper coupling crystal, after resonant amplification of the pump light in the echo wall microdisk optical parametric oscillator, signal light in a near infrared band and idle frequency light in a mid infrared band are generated, the signal light and the idle frequency light sequentially pass through the upper coupling crystal and the second lens, and then are output.

Compared to the prior art, the advantageous effects of the present application are that the mass and volume of the double-microdisk-based miniature mid-infrared laser are significantly reduced by using the echo wall microdisk laser and the echo wall microdisk optical parametric oscillator as one stacked double microdisk structure and multiple coupling of the laser is made possible by means of a coupler, whereby the high requirements of the laser in terms of weight and volume are met.

character list

• 1 ist eine schematische Darstellung des Gesamtaufbaus eines doppelmikroscheibe-basierten Miniatur-Mittelinfrarotlasers gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung;
• 2 ist eine schematische Darstellung einer Doppelmikroscheibenstruktur eines doppelmikroscheibe-basierten Miniatur-Mittelinfrarotlasers gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung;
• 3 ist eine schematische Darstellung einer Kopplerstruktur eines doppelmikroscheibe-basierten Miniatur-Mittelinfrarotlasers gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung;
• 4 ist eine schematische Darstellung eines linearen periodischen Musters eines Echowand-Mikroscheiben-Optisch-Parametrischen-Oszillators gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung;
• 5 ist eine schematische Darstellung eines sektoralen periodischen Musters eines Echowand-Mikroscheiben-Optisch-Parametrischen-Oszillators gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung;
• 6 ist eine schematische Darstellung der Struktur eines doppelmikroscheibe-basierten Miniatur-Mittelinfrarotlasers gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung in Draufsicht;
• 7 ist eine schematische Darstellung der Struktur eines doppelmikroscheibe-basierten Miniatur-Mittelinfrarotlasers gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung in Seitensicht;
• 8 ist eine schematische Darstellung einer Gehäusestruktur eines doppelmikroscheibe-basierten Miniatur-Mittelinfrarotlasers gemäß einem Ausführungsbeispiel der vorliegenden Anmeldung.

To illustrate the disclosure content of the present invention, reference is made to the accompanying figures. It should be noted that the figures are presented for illustrative purposes only, not to limit the scope of the present invention. In the figures, one and the same reference number stands for the same component.

• 1 Fig. 12 is a schematic representation of the overall structure of a double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application;
• 2 Figure 12 is a schematic representation of a double-microdisk structure of a double-microdisk-based miniature mid-infrared la sers according to an embodiment of the present application;
• 3 Fig. 12 is a schematic representation of a coupler structure of a dual-microdisk-based miniature mid-infrared laser according to an embodiment of the present application;
• 4 Fig. 12 is a schematic representation of a linear periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application;
• 5 Fig. 12 is a schematic representation of a sectoral periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application;
• 6 Fig. 12 is a schematic representation of the structure of a double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application in plan view;
• 7 Fig. 12 is a schematic representation of the structure of a dual-microdisk-based miniature mid-infrared laser according to an embodiment of the present application in side view;
• 8th 12 is a schematic representation of a package structure of a dual-microdisk-based miniature mid-infrared laser according to an embodiment of the present application.

Reference List

1

laser source,

2

coupler,

21

first lens,

22

lower coupling crystal,

221

incident surface,

222

lower coupling surface,

23

upper coupling crystal,

231

upper coupling surface,

232

exit surface,

233

first reflective surface,

234

second reflective surface,

24

second lens,

3

echo wall microdisc laser,

4

echo wall microdisk optical parametric oscillator,

5

first heating plate,

6

second heating plate,

7

third heating plate,

8th

fourth heating plate,

9

metal case,

91

gas-tight opening,

92

wire hole.

EMBODIMENTS OF THE INVENTION

It is understood that according to the technical solution of the present invention, a person skilled in the art can make a variety of mutually interchangeable constructions and implementations without changing the substantive concept of the present invention. Therefore, the following specific embodiments and figures are only exemplary representations of the technical solution of the present invention and must not be regarded as definitions or limitations for the entire present invention or for the technical solution of the present invention.

In order to meet the relatively high weight and volume requirements of the laser, in one embodiment of the present application, a dual-microdisk-based miniature mid-infrared laser is provided. As in 1 shown, it is a schematic representation of the overall structure of a double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application; the dual microdisk-based miniature mid-infrared laser comprises a laser source 1, a coupler 2, an echo wall microdisk laser 3, and an echo wall microdisk optical parametric oscillator 4. As in 2 1 is a schematic representation of a double-microdisk structure of a double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application; the echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4 are stacked, a double microdisk structure is formed. The echo wall microdisk laser 3 consists of a crystal doped with rare earth ions, for example Nd:YAG (yttrium aluminum garnet), Nd:YVO ₄ (neodymium-doped yttrium vanadate) or the like. The echo wall microdisk laser 3 has a thickness of 0.5 mm and a diameter of 1 mm - 10 mm, preferably 3 mm.

The wavelength of the resonance light of the echo wall microdisk laser 3 is 1000 nm to 1500 nm, for example, in practice 1064 nm, 1342 nm or the like. As a material of the echo wall microdisc optical parametric oscillator 4, a ferroelectric crystal is used, for example, consists of crystals of LiNbO ₃ (lithium niobate), LiTaO ₃ (lithium tantalate), or KTP (potassium titanyl phosphate); Periodic domain structures are generated using a room-temperature electric field polarization method to compensate for a potential phase mismatch in the second-order nonlinear process. Typical polarization patterns are shown in 4 and 5 shown. 4 Fig. 12 is a schematic representation of a linear periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application; 5 Fig. 12 is a schematic representation of a sectoral periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application; in 4 and 5 the black and white parts represent domains in opposite directions of polarization. The laser source 1 consists of a distributed Bragg reflection DBR semiconductor laser of 808 nm and outputs single-frequency lasers with a wavelength of 808 nm.

As in 3 1 is a schematic representation of a coupler structure of a dual-microdisk-based miniature mid-infrared laser according to an embodiment of the present application; the coupler 2 comprises a first lens 21, a lower coupling crystal 22, an upper coupling crystal 23 and a second lens 24; the lower coupling crystal 22 and the upper coupling crystal 23 are stacked.

In practical application, the lower coupling crystal 22 and the upper coupling crystal 23 are produced from the rutile; the first lens 21 is provided between the laser source 1 and an incident surface 221 of the lower coupling crystal 22, the echo wall microdisk laser 3 is tangential to a lower coupling surface 222 of the lower coupling crystal 22, the echo wall microdisk laser 3 is tangent to an upper coupling surface 231 of the upper coupling crystal 23, the echo wall microdisk optical parametric oscillator 4 is tangent to an upper coupling surface 231 of the upper coupling crystal 23, the second lens 24 is coupled to an output surface 232 of the upper coupling crystal 23.

In the double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application, in practical application, the laser source 1 is provided for generating a single-frequency laser, the single-frequency laser being coupled and collimated through the first lens 21 and then through the lower coupling crystal 22 into the echo wall Microdisc laser 3 is coupled, the single-frequency laser forms pump light after a transition to the upper energy level through the echo wall microdisk laser 3, the pump light being coupled through the upper coupling crystal 23 into the echo wall microdisk optical parametric oscillator 4, after resonance amplification of the pump light in the echo wall microdisc optical parametric oscillator 4, signal light in a near-infrared band and idle frequency light in a mid-infrared band are generated, the signal light and idle frequency light successively passing through the upper coupling crystal 23 and the second lens 24 and then being output.

The mass and volume of the double-microdisk-based miniature mid-infrared laser are significantly reduced by designing the echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4 as a stacked double-microdisk structure and using a coupler 2 multiple coupling of the laser is made possible, whereby the high requirements of the laser in terms of weight and volume are met.

As in 3 As shown, in some embodiments of the present application, the top coupling crystal 23 further comprises a first reflective surface 233 and a second reflective surface 234; the first reflecting surface 233 and the second reflecting surface 234 are both an arc surface; the pumping light is sequentially reflected by the first reflecting surface 233 and the second reflecting surface 234 and focused into the upper coupling crystal 23 . The following is illustrated by specific examples. 6 Fig. 12 is a schematic representation of the structure of a double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application in plan view; 7 12 is a schematic representation of the structure of a dual-microdisk-based miniature mid-infrared laser according to an embodiment of the present application in side view.

As in 6 shown, it is a schematic representation of the structure of the 1 in top view. The laser source 1 is a DBR laser with a wavelength of 808 nm, a line width of 10 MHz and an average power of 100 mW. The 808 nm laser output from the laser source 1 is collimated by the first lens 21 and then output, and entered the lower coupling crystal 22; the distance between the echo wall microdisk laser 3 and the lower one coupling surface 222 is 100 nm; the distance between the echo wall microdisc optical parametric oscillator 4 and the upper coupling surface 231 is 100 nm; the 808 nm laser forms an evanescent wave at the interface between the lower coupling surface 222 and the echo wall microdisk laser 3, enters the echo wall microdisk laser 3, and propagates along the outer annular side wall of the echo wall microdisk laser 3 out of. After the Nd:YVO ₄ crystal has absorbed the 808 nm laser, a transition to the upper energy level produces the 1064 nm laser; the resonance amplified pump light is formed in the echo wall microdisk laser 3 and exits through the coupling plane; the pumping light enters the upper coupling surface 231 and is sequentially reflected and focused by the first reflecting surface 233 and the second reflecting surface 234, and then enters the echo wall microdisk optical parametric oscillator 4 through the upper coupling surface 231 and propagates along the outside of the echo wall microdisc optical parametric oscillator 4; resonance amplification is performed for the 1064 nm laser in the echo wall microdisc optical parametric oscillator 4; when the intensity exceeds a threshold, a 1548.6 nm laser (signal light) and a 3400 nm laser (idle frequency light) which have been parametric down-converted are generated. The generated signal light and the idle frequency light are resonant amplified in the echo wall microdisk optical parametric oscillator 4, and the generated laser of 1548.6 nm and the laser of 3400 nm are successively transmitted through the upper coupling surface 231, the output surface 232 and the second Lens 24 output.

The second-order nonlinear process in the echo wall microdisc optical parametric oscillator 4 runs such that a 1064 nm photon is converted into a 1548.6 nm photon and a 3400 nm photon by a second-order nonlinear process, and according to the phase matching equation, the echo wall microdisk optical parametric oscillator 4 has a polarization period of 30.6 μm at 27° C. The above period is calculated by polarizing the electric field at room temperature according to the pattern in 5 created.

As an example will 6 called. In the echo wall microdisk laser 3, the 808 nm laser rotates counter-clockwise, while the generated 1064 nm laser is distributed in both clockwise and counter-clockwise directions. The clockwise rotating laser of 1064 nm enters the lower coupling crystal 22 through the lower coupling surface 222, and returns the same way and re-enters the echo wall microdisk laser 3, then converts to counterclockwise rotation. After repeating the above operation several times, because of the gain competition effect of the laser, the counterclockwise rotating 1064nm laser becomes stronger and the clockwise rotating 1064nm laser becomes weaker, finally producing an effect of unidirectional transmission and unidirectional output of the laser Lasers of 1064nm in the micro disk laser is made possible. In the echo wall microdisk optical parametric oscillator 4, because of the non-linear effect, the direction of the generated signal light and the idle frequency light is the same as the direction of the pump laser (1064 nm), so there is only the counterclockwise transmitted laser.

Furthermore, the wavelength of the pump laser output from the echo wall microdisk laser 3 must match the longitudinal mode of the echo wall microdisk optical parametric oscillator 4, only then a maximum coupling effect is achieved. In order to achieve this purpose, in an embodiment of the present application, both the echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4 have a temperature control device. As in 7 1, it is a schematic representation of the structure in side view, the double-microdisk-based miniature mid-infrared laser further comprises a first heating plate 5 and a second heating plate 6, each provided on two sides of the echo wall microdisk laser 3, and a third heating plate 7 and a fourth heating plate 8 provided on two sides of the echo wall microdisc optical parametric oscillator 4, respectively. Controlling the temperature of the echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4 ensures that the wavelength of the pump laser matches the longitudinal mode of the echo wall microdisk optical parametric oscillator 4 .

The first heating plate 5, the second heating plate 6, the third heating plate 7 and the fourth heating plate 8 are each internally composed of an electric heating wire and a temperature sensor (eg PT1000). By controlling the first heating plate 5 and the second heating plate 6, the temperature of the echo wall microdisk laser 3 is controlled, and by controlling the third heating plate 7 and the fourth heating plate 8, the temperature of the echo wall microdisk optical parametric oscillator 4 is controlled, so that the wavelength of the 1064 nm laser output from the echo wall microdisk laser 3 can be aligned with the resonance wavelength of the echo wall microdisk optical parametric oscillator 4, and so that the signal light and the idle frequency light in the echo wall microdisk optical parametric oscillator 4 can perform a double resonance.

As in 8th shown, it is a schematic representation of a housing structure of a double-microdisk-based miniature mid-infrared laser according to an embodiment of the present application. The double-microdisk-based miniature mid-infrared laser further comprises a metal case 9, inside of the metal case 9 a heat insulating plate is provided, the metal case 9 is designed as a sealed structure and provided with a gas tight opening 91 for filling with nitrogen and a wire hole 92 for leading out a electric control wire is provided, the gas-tight opening 91 is rotated repeatedly to open and seal.

In summary, the present application discloses a double-microdisk-based miniature mid-infrared laser, the advantageous effect of which includes that the mass and volume of the double-microdisk-based miniature mid-infrared laser are significantly reduced by using the echo wall microdisk laser 3 and the echo wall microdisk optical parametric -Oscillator 4 are designed as a stacked double microdisk structure and multiple coupling of the laser is made possible by means of a coupler 2 . Thus, the problem is solved that a laser is difficult to be used in areas with high weight and volume requirements because of its complex overall structure and large volume and weight, thus satisfying high weight and volume requirements of the laser.

The technical scope of the present application is not limited to the content described above, those skilled in the art can make various variations and modifications to the above embodiments without departing from the technical concept of the present invention, and all such variations and modifications fall under the scope of protection of the present invention.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• CN 209418978 U [0004]
• CN 106981818B [0004]
• CN 106992426B [0004]

Claims (9)

A double microdisk-based miniature mid-infrared laser comprising a laser source (1), a coupler (2), an echo wall microdisk laser (3), and an echo wall microdisk optical parametric oscillator (4); wherein the echo wall microdisk laser (3) and the echo wall microdisk optical parametric oscillator (4) are stacked; wherein the coupler (2) comprises a first lens (21), a lower coupling crystal (22), an upper coupling crystal (23) and a second lens (24), and wherein the lower coupling crystal (22) and the upper coupling crystal (23) are stacked; the first lens (21) being positioned between the laser source (1) and an incident surface (221) of the lower coupling crystal (22), the echo wall microdisk laser (3) being tangential to a lower coupling surface (222) of the lower coupling crystal (22) and the echo wall microdisk laser (3) is tangent to a top coupling surface (231) of the top coupling crystal (23), the echo wall microdisk optical parametric oscillator (4) is tangent to a top coupling surface (231) of the top coupling crystal ( 23), the second lens (24) is coupled to an output face (232) of the upper coupling crystal (23); the laser source (1) being arranged to produce a single frequency laser which is coupled and collimated by the first lens (21) and thereafter coupled through the lower coupling crystal (22) into the echo wall microdisk laser (3), the single frequency laser after a transition to the upper energy level by the echo wall microdisc laser (3) forms pump light, which is coupled through the upper coupling crystal (23) into the echo wall microdisk optical parametric oscillator (4), wherein after resonance amplification of the pump light in the echo wall microdisk Optical parametric oscillator (4) signal light in a near-infrared band and idle frequency light in a mid-infrared band are generated, the signal light and idle frequency light sequentially passing through the upper coupling crystal (23) and the second lens (24) and then being output. double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that the upper coupling crystal (23) further comprises a first reflective surface (233) and a second reflective surface (234); both of which are an arc surface; and wherein the pumping light is sequentially reflected from the first reflecting surface (233) and the second reflecting surface (234) and focused into the upper coupling crystal (23). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that it further comprises a first heating plate (5) and a second heating plate (6) each provided on two sides of the echo wall microdisk laser (3). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that it further comprises a third heating plate (7) and a fourth heating plate (8) each provided on two sides of the echo wall microdisc optical parametric oscillator (4). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that a neodymium-doped yttrium vanadate crystal with a thickness of 0.5 mm and a diameter of 1 mm-10 mm is used as the material of the echo wall microdisk laser (3). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that a ferroelectric crystal is used as the material of the echo wall microdisk optical parametric oscillator (4). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that rutile is used as the material of the lower coupling crystal (22) and the upper coupling crystal (23). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that a plane on which the lower coupling surface (222) is located coincides with a plane on which the upper coupling surface (231) is located; and that there is a distance of 100 nm between the echo wall microdisk laser (3) and the lower coupling surface (222); there being a distance of 100 nm between the echo wall microdisc optical parametric oscillator (4) and the upper coupling surface (231). double-microdisk-based miniature mid-infrared laser after the claim 1 , characterized in that it further comprises a metal case (9), a heat insulating plate being provided inside the metal case (9), and the metal case (9) having a gas-tight opening (91) for filling with nitrogen and a wire hole (92) for Bringing out an electrical control wire is provided.

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