JP3243836U - Compact mid-infrared laser based on dual microdisks - Google Patents

Abstract

The compact mid-infrared laser based on dual microdisk includes a laser light source (1), a coupler (2), an echowall microdisk laser (3) and an echowall microdisk optical parametric oscillator (4), and the echowall microdisk The laser (3) and the echo wall microdisk optical parametric oscillator (4) are installed in a stacked manner, and the coupler (2) includes a first lens (21), a lower layer coupling crystal (22), an upper layer coupling crystal (23) and a second lens. (24), the lower layer coupling crystal (22) and the upper layer coupling crystal (23) are installed in a stack, and during the actual application, the echo wall microdisk laser (3) and the echo wall microdisk optical parametric oscillator (4) By designing a stacked dual microdisk structure and realizing multiple combinations of laser light using one coupler (2), the mass and volume of a small mid-infrared laser based on dual microdisks can be reduced. significantly reduced, thereby meeting high demands on laser weight and volume. [Selection diagram] Figure 8

Description

The present application relates to the field of mid-infrared laser light technology, and in particular to compact mid-infrared lasers based on dual microdisks.

Mid-infrared laser light with a wavelength range of 3 to 5 μm is optimal for infrared spectroscopic analysis, and is therefore widely applied in multiple fields such as medicine and biotechnology. In addition, because laser light in the mid-infrared wavelength band has strong atmospheric penetration ability, it is widely applied in multiple fields such as meteorological observation, spatial optical communication, laser ranging, laser radar, laser guidance, and remote sensing. .

In many technical configurations that generate light sources in the long-wavelength infrared wavelength band, it is possible to use a near-infrared laser as the pump light source, and to realize frequency conversion using the optical parametric effect, it is possible to use a long-wavelength infrared laser with a wavelength of 3 to 5 μm. One means of acquiring light and its technological approaches include difference frequency (DF), optical parametric generation (OPG), optical parametric oscillation (OPO), and optical parametric amplifier (OPA). OPO and OPA technologies have simpler devices than DF and OPG technologies, and can obtain higher repetition frequencies and higher average power outputs.

Based on the above principle, the utility model CN209418978U registration publication discloses a highly efficient mid-infrared continuously tunable optical parametric oscillation laser, and the patent CN106981818B registration publication discloses a sheet-like microcavity near-infrared seed light injection lock. A tunable mid-infrared narrow linewidth nanosecond pulsed optical parametric amplifier is disclosed, and patent CN106992426B registration publication discloses a single-ended output intracavitary pump optical parametric oscillator. All of the above documents adopt separate spatial optical elements as the main components of the laser, such as resonator mirrors, lenses, reflectors, etc., so the laser has a complex overall structure and a large volume. Due to its large size and heavy weight, it is difficult to be applied in fields with high demands on weight and volume.

China Utility Model No. 209418978 Chinese Patent No. 106981818 Chinese Patent No. 106992426

The present application provides a compact mid-infrared laser based on dual microdisks, which can solve the problem that the overall structure is complex, the volume is large, and the weight is heavy, making it difficult to be applied in fields with high requirements for weight and volume. do.

In order to solve the above problems, a compact mid-infrared laser based on dual microdisks according to the present application includes a laser light source, a coupler, an EchoWall Microdisk laser, and an EchoWall Microdisk optical parametric oscillator, and includes the EchoWall Microdisk optical parametric oscillator. The disk laser and the echo wall micro disk optical parametric oscillator are stacked and installed,
The coupler includes a first lens, a lower layer bonding crystal, an upper layer bonding crystal, and a second lens, and the lower layer bonding crystal and the upper layer bonding crystal are stacked,
The first lens is installed between the laser light source and the incident surface of the lower coupling crystal, the echo wall microdisk laser is adjacent to the lower coupling surface of the lower coupling crystal, and the echo wall microdisk The laser is in contact with the upper coupling surface of the upper coupling crystal, the echo wall microdisk optical parametric oscillator is in contact with the upper coupling surface of the upper coupling crystal, and the second lens is in contact with the upper coupling surface of the upper coupling crystal. coupled to the output surface,
The laser light source is used to generate a single frequency laser light, and the single frequency laser light is combined and collimated by the first lens, and then combined by the lower coupling crystal to generate the echo wall micro. A single frequency laser beam enters the disk laser and forms a pump light by upper level transition by the echo wall micro disk laser, and the pump light is combined by the upper layer coupling crystal to generate the echo wall micro disk optical parametric. The pump light enters the oscillator, and the resonance is enhanced within the echo wall microdisk optical parametric oscillator to generate a signal light in the near-infrared wavelength band and an idler light in the mid-infrared wavelength band, and the signal light and the idler light are passes through the upper layer coupling crystal and the second lens in order and is output.

As a preferable configuration, the upper layer bonded crystal further includes a first reflective surface and a second reflective surface, and the first reflective surface and the second reflective surface are both arcuate surfaces,
The pump light enters the upper layer coupling crystal after being sequentially reflected and focused by the first reflective surface and the second reflective surface.

Preferably, the dual microdisk based compact mid-infrared laser further includes a first heating sheet and a second heating sheet respectively installed on both sides of the echo wall microdisk laser.

In a preferred configuration, the dual microdisk based compact mid-infrared laser further includes a third heating sheet and a fourth heating sheet respectively installed on both sides of the echo wall microdisk optical parametric oscillator.

In a preferred configuration, the material of the echo wall microdisk laser is a neodymium-doped yttrium vanadate crystal with a thickness of 0.5 mm and a diameter of 1 mm to 10 mm.

In a preferred configuration, the material of the echo wall microdisk optical parametric oscillator is a ferroelectric crystal.

In a preferred configuration, the material of the lower layer bonded crystal and the upper layer bonded crystal is rutile.

In a preferred configuration, a plane on which the lower bonding surface is located overlaps a plane on which the upper bonding surface is located,
The pitch between the echo wall microdisk laser and the lower coupling surface is 100 nm, and the pitch between the echo wall microdisk optical parametric oscillator and the upper coupling surface is 100 nm.

In a preferred configuration, the small mid-infrared laser based on dual microdisks further includes a metal case, a heat insulating plate is installed inside the metal case, and the metal case is filled with nitrogen gas. There is an airtight opening for this and a wire hole for pulling out the electrical control line.

During practical application, a laser light source is used to generate a single frequency laser light, which is combined and collimated by a first lens, and then combined by a lower coupling crystal to produce an echo. Entered into the wall microdisk laser, the single frequency laser light forms a pump light by the upper level transition by the echo wall microdisk laser, and the pump light is combined by the upper layer coupling crystal to produce an echo wall microdisk optical parametric oscillator. The pump light is resonantly enhanced within the echo wall microdisk optical parametric oscillator to generate a signal light in the near-infrared wavelength band and an idler light in the mid-infrared wavelength band, and the signal light and idler light are The light passes through the upper layer coupling crystal and the second lens in order and is output.

Compared to the prior art, the beneficial effects of the present application include the following. By designing the Echo Wall Micro Disk laser and the Echo Wall Micro Disk optical parametric oscillator into a stacked dual micro disk structure, and realizing multiple combinations of laser beams using one coupler, we can create a dual micro disk. The mass and volume of the compact mid-infrared laser based on the laser are significantly reduced, thereby meeting the high demands on the weight and volume of the laser.

The disclosure of the present invention will be explained with reference to the drawings. The drawings are only for illustration purposes and do not limit the protection scope of the present invention. In the drawings, like symbols are used to refer to like parts.
1 is a schematic diagram of the overall structure of a compact mid-infrared laser based on dual microdisks according to an embodiment of the present application; FIG. 1 is a schematic diagram of a dual microdisk structure of a compact mid-infrared laser based on dual microdisks according to an embodiment of the present application; FIG. 1 is a schematic diagram of a coupler structure of a compact mid-infrared laser based on dual microdisks according to an embodiment of the present application; FIG. FIG. 2 is a schematic diagram of a linear periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application. FIG. 2 is a schematic diagram of a fan-shaped periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application. 1 is a schematic diagram of a planar structure of a compact mid-infrared laser based on dual microdisks according to the present application; FIG. FIG. 2 is a schematic diagram of a side structure of a compact mid-infrared laser based on dual microdisks according to the present application. 1 is a schematic diagram of a case structure of a compact mid-infrared laser based on dual microdisks according to an embodiment of the present application; FIG.

Based on the technical configuration of the present invention, those skilled in the art can provide various structural forms and implementation forms that can be replaced with each other without changing the substantial spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary explanations for the technical configuration of the present invention, and should not be considered as limitations or limitations on the entire present invention or the technical configuration of the present invention.

In an embodiment of the present application, in order to meet the high demands on the weight and volume of the laser, a compact mid-infrared laser based on dual microdisks is provided, and as shown in FIG. 1 is a schematic diagram of the overall structure of a small mid-infrared laser based on dual microdisks, and the small mid-infrared laser based on dual microdisks includes a laser light source 1, a coupler 2, an echowall microdisk laser 3 and an echowall microdisk optical parametric 3 is a schematic diagram of a dual microdisk structure of a small mid-infrared laser based on dual microdisks according to an embodiment of the present application, including an oscillator 4, as shown in FIG. 2, the echo wall microdisk laser 3 and the echo wall The microdisk optical parametric oscillators 4 are arranged in a stacked manner to form a dual microdisk structure. The echo wall microdisk laser 3 is composed of a rare earth ion-doped crystal such as Nd:YAG (yttrium aluminum garnet) or Nd:YVO ₄ (neodymium-doped yttrium vanadate), and the echowall microdisk laser 3 is , a thickness of 0.5 mm and a diameter of 1 mm to 10 mm, preferably a diameter of 3 mm.

The resonant wavelength of the echo wall microdisk laser 3 is 1000 nm to 1500 nm, and can be set at 1064 nm, 1342 nm, etc. in actual application, and the material of the echo wall microdisk optical parametric oscillator 4 is ferroelectric. It is composed of crystals such as LiNbO ₃ (lithium niobate), LiTaO ₃ (lithium tantalate), or KTP (potassium titanium phosphate), and uses a room temperature electric field polarization method to eliminate the phase mismatch of the second-order nonlinear process. A periodic domain structure is generated for compensation. Here, typical polarization patterns are as shown in FIGS. 4 and 5, and FIG. 4 is a schematic diagram of a linear periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application, and FIG. 5 is a schematic diagram of a fan-type periodic pattern of an echo wall microdisk optical parametric oscillator according to an embodiment of the present application, and in FIGS. 4 and 5, black and white portions represent domains with opposite polarization directions. There is. The laser light source 1 is composed of an 808 nm distributed Bragg reflection semiconductor laser, and outputs a single frequency laser beam having a wavelength of 808 nm.

As shown in FIG. 3, which is a schematic diagram of a coupler structure of a small mid-infrared laser based on dual microdisks according to an embodiment of the present application, the coupler 2 includes a first lens 21, a lower coupling crystal 22, It includes an upper layer bonding crystal 23 and a second lens 24, and the lower layer bonding crystal 22 and the upper layer bonding crystal 23 are stacked.

In actual application, rutile material is used to manufacture the lower layer bonded crystal 22 and the upper layer bonded crystal 23. The first lens 21 is installed between the laser light source 1 and the entrance surface 221 of the lower coupling crystal 22, and the echo wall microdisk laser 3 is adjacent to the lower coupling surface 222 of the lower coupling crystal 22. The echo wall microdisk laser 3 is in contact with the upper coupling surface 231 of the upper coupling crystal 23 , and the echo wall microdisk optical parametric oscillator 4 is in contact with the upper coupling surface 231 of the upper coupling crystal 23 . , the second lens 24 is coupled to the output surface 232 of the upper coupling crystal 23 .

During the practical application of the compact mid-infrared laser based on dual microdisk according to the embodiment of the present application, the laser light source 1 is used to generate a single frequency laser light, and the single frequency laser light is After being combined and collimated by the first lens 21, the single frequency laser beam is combined by the lower coupling crystal 22 and enters the echo wall microdisk laser 3. The pump light is coupled by the upper layer coupling crystal 23 and enters the echo wall microdisk optical parametric oscillator 4; The resonance is strengthened to generate a signal light in a near-infrared wavelength band and an idler light in a mid-infrared wavelength band, and the signal light and idler light sequentially pass through the upper layer coupling crystal 23 and the second lens 24 and are output. be done.

The echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4 are designed to have a stacked dual microdisk structure, and one coupler 2 is used to couple the laser beams multiple times. This greatly reduces the mass and volume of the compact mid-infrared laser based on the dual microdisk, thereby meeting the high demands on the weight and volume of the laser.

As shown in FIG. 3, in some embodiments of the present application, the upper layer coupling crystal 23 further includes a first reflective surface 233 and a second reflective surface 234, and the first reflective surface 233 and the second reflective surface 234 are all arcuate surfaces, and the pump light enters the upper layer coupling crystal 23 after being reflected and focused by the first reflecting surface 233 and the second reflecting surface 234 in this order. A specific example will be explained below. FIG. 6 is a schematic diagram of a planar structure of a compact mid-infrared laser based on dual microdisks according to the present application, and FIG. 7 is a schematic diagram of a side structure of a compact mid-infrared laser based on dual microdisks according to the present application. be.

As shown in FIG. 6, which is a schematic diagram of the planar structure of FIG. 1, the laser light 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 beam output from the laser light source 1 is collimated by the first lens 21 and then output, and enters the lower layer coupling crystal 22 to connect the echo wall microdisk laser 3 and the lower layer coupling surface 222. The pitch between the echo wall micro disk optical parametric oscillator 4 and the upper coupling surface 231 is 100 nm, and the 808 nm laser beam is transmitted between the lower coupling surface 222 and the echo wall micro disk. An evanescent wave (attenuated wave) is formed at the interface with the disk laser 3, which enters the echo wall micro disk laser 3 and is propagated along the outer annular side wall of the echo wall micro disk laser 3. The Nd:YVO ₄ crystal absorbs the 808 nm laser light, and the upper level transition generates the 1064 nm laser light, which forms a resonance-enhanced pump light in the echo wall microdisk laser 3 and transmits it through the coupling plane. The emitted pump 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 passes through the upper coupling surface 231 to the echo wall microdisk optical parametric oscillator. 4 and propagates along the outside of the echo wall microdisk optical parametric oscillator 4, and the 1064 nm laser light in the echo wall microdisk optical parametric oscillator 4 undergoes resonance enhancement, and when the intensity exceeds a threshold, the parametric A 1548.6 nm laser beam (signal light) and a 3400 nm laser beam (idler light) are generated by the downward conversion. The generated signal light and idler light are resonance-enhanced in the echo wall microdisk optical parametric oscillator 4, and the generated 1548.6 nm laser light and 3400 nm laser light are transmitted to the upper coupling surface 231, the output surface 232 and The light passes sequentially through the second lens 24 and is output.

The second order nonlinear process in the echo wall microdisk optical parametric oscillator 4 is that one 1064 nm photon is converted into one 1548.6 nm photon and one 3400 nm photon by the second order nonlinear process, and bit matching According to the formula, at 27° C., the polarization period of the echo wall microdisk optical parametric oscillator 4 is 30.6 μm. The above period was created according to the graph of FIG. 5 using a room temperature electric field polarization method.

Taking FIG. 6 as an example, in the echo wall microdisk laser 3, the 1064 nm laser beam generated by rotating the 808 nm laser beam counterclockwise is distributed in both the clockwise and counterclockwise directions. The clockwise 1064 nm laser beam enters the lower coupling crystal 22 via the lower coupling surface 222, returns along the original path, enters the echo wall microdisk laser 3 again, and rotates counterclockwise. Convert to After repeating the above process multiple times, the 1064nm laser light rotating in the counterclockwise direction will become more and more intense because of the gain competition effect in the laser light, and the 1064nm laser light rotating in the clockwise direction will become more and more intense. It becomes weaker and weaker, thereby finally forming the unidirectional transmission and unidirectional output effect of the 1064 nm laser light in the microdisk laser. In addition, in the echo wall microdisk optical parametric oscillator 4, the direction of the generated signal light and idler light coincides with the direction of the pump laser light (1064 nm) due to the nonlinear effect, so the laser beam is transmitted in the counterclockwise direction. Only light exists.

Furthermore, in order to achieve the maximum coupling effect, the wavelength of the pump laser light output from the echo wall microdisk laser 3 needs to overlap with the longitudinal mode of the echo wall microdisk optical parametric oscillator 4. To achieve this objective, in the embodiment of the present application, the echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4 each have a temperature control device, as shown in FIG. 1, the small mid-infrared laser based on the dual microdisk includes a first heating sheet 5 and a second heating sheet 6 installed on both sides of the echo wall microdisk laser 3, and , further including a third heating sheet 7 and a fourth heating sheet 8 installed on both sides of the echo wall microdisk optical parametric oscillator 4, respectively. By controlling the temperatures of the echo wall microdisk laser 3 and the echo wall microdisk optical parametric oscillator 4, it is ensured that the wavelength of the pump laser light and the longitudinal mode of the echo wall microdisk optical parametric oscillator 4 overlap. .

The insides of the first heating sheet 5, the second heating sheet 6, the third heating sheet 7, and the fourth heating sheet 8 are all configured with heating wires and temperature sensors (eg, PT1000). By controlling the first heating sheet 5 and the second heating sheet 6, the temperature of the echo wall microdisk laser 3 is controlled, and by controlling the third heating sheet 7 and the fourth heating sheet 8, the temperature of the echo wall microdisk laser 3 is controlled. The temperature of the microdisk optical parametric oscillator 4 is controlled. Thereby, the wavelength of the 1064 nm laser beam output from the Echo Wall Microdisk laser 3 can be aligned with the resonant wavelength of the Echo Wall Microdisk optical parametric oscillator 4. The signal light and the idler light can cause double resonance.

As shown in FIG. 8, it is a schematic diagram of a case structure of a compact mid-infrared laser based on dual microdisks according to an embodiment of the present application. The small mid-infrared laser based on dual microdisks further includes a metal case 9, a heat insulating plate is installed inside the metal case 9, and the metal case 9 has a sealed design structure, and has a nitrogen-containing structure. An airtight opening 91 for filling gas and a wire hole 92 for drawing out an electric control line are provided, and the airtight opening 91 can be repeatedly opened and sealed by rotation.

In summary, this application discloses a compact mid-infrared laser based on dual microdisks, the beneficial effects of which are as follows. The echo wall micro disk laser 3 and the echo wall micro disk optical parametric oscillator 4 are designed to have a stacked dual micro disk structure, and one coupler 2 is used to realize multiple combinations of laser beams. This greatly reduces the mass and volume of the small mid-infrared laser based on dual microdisks, and the laser has high requirements on weight and volume due to its complex overall structure, large volume, and heavy weight. Solving the problem of difficulty in application in the field, thereby meeting the high demands on the weight and volume of the laser.

The technical scope of the present application is not limited to the contents of the above explanation, and those skilled in the art will be able to make various modifications and modifications to the above embodiment without departing from the technical idea of the present invention. Any such variations and modifications that may be made should fall within the protection scope of the present invention.

DESCRIPTION OF SYMBOLS 1...Laser light source, 2...Coupler, 21...First lens, 22...Lower layer coupling crystal, 221...Incidence surface, 222...Lower layer coupling surface, 23...Upper layer coupling crystal, 231...Upper layer coupling surface, 232...Output surface, 233...First reflective surface, 234...Second reflective surface, 24...Second lens, 3...Echo wall microdisk laser, 4...Echo wall microdisk optical parametric oscillator, 5...First heating sheet, 6...Second heating Sheet, 7...Third heating sheet, 8...Fourth heating sheet, 9...Metal case, 91...Airtight opening, 92...Wire hole

Claims (9)

It includes a laser light source (1), a coupler (2), an Echo Wall Microdisk laser (3) and an Echo Wall Microdisk optical parametric oscillator (4), the Echo Wall Microdisk laser (3) and the Echo Wall Microdisk optical The parametric oscillator (4) is installed in a stacked manner,
The coupler (2) includes a first lens (21), a lower layer bonding crystal (22), an upper layer bonding crystal (23), and a second lens (24), and the lower layer bonding crystal (22) and the upper layer bonding crystal (23) is a stacked installation,
The first lens (21) is installed between the laser light source (1) and the incident surface (221) of the lower layer coupling crystal (22), and the echo wall microdisk laser (3) The echo wall micro disk laser (3) is adjacent to the lower bonding surface (222) of the crystal (22), and the echo wall micro disk laser (3) is adjacent to the upper bonding surface (231) of the upper bonding crystal (23). The disk optical parametric oscillator (4) is adjacent to the upper coupling surface (231) of the upper coupling crystal (23), and the second lens (24) is adjacent to the output surface (232) of the upper coupling crystal (23). combined with
The laser light source (1) is used to generate a single frequency laser light, which is combined and collimated by the first lens (21) and then the lower coupling crystal (22). ) and enter the echo wall microdisk laser (3), the single frequency laser light forms a pump light by the upper level transition by the echo wall microdisk laser (3), and the pump light is The pump light is coupled by the upper layer coupling crystal (23) and enters the echo wall micro-disk optical parametric oscillator (4), and the pump light is resonance-enhanced within the echo wall micro-disk optical parametric oscillator (4) to generate near-infrared light. Generates a signal light in an outer wavelength band and an idler light in a mid-infrared wavelength band, and the signal light and idler light sequentially pass through the upper layer coupling crystal (23) and the second lens (24) and are output.
A compact mid-infrared laser based on dual microdisks. The upper layer bonded crystal (23) further includes a first reflective surface (233) and a second reflective surface (234), and each of the first reflective surface (233) and the second reflective surface (234) has a circular arc shape. surface,
The pump light enters the upper layer coupling crystal (23) after being sequentially reflected and focused by the first reflective surface (233) and the second reflective surface (234).
A compact mid-infrared laser based on dual microdisks according to claim 1. further comprising a first heating sheet (5) and a second heating sheet (6) respectively installed on both sides of the echo wall microdisk laser (3);
A compact mid-infrared laser based on dual microdisks according to claim 1. further comprising a third heating sheet (7) and a fourth heating sheet (8) respectively installed on both sides of the echo wall microdisk optical parametric oscillator (4);
A compact mid-infrared laser based on dual microdisks according to claim 1. The material of the echo wall microdisk laser (3) is neodymium-doped yttrium vanadate crystal, with a thickness of 0.5 mm and a diameter of 1 mm to 10 mm.
A compact mid-infrared laser based on dual microdisks according to claim 1. The material of the echo wall microdisk optical parametric oscillator (4) is a ferroelectric crystal.
A compact mid-infrared laser based on dual microdisks according to claim 1. The material of the lower layer combined crystal (22) and the upper layer combined crystal (23) is rutile;
A compact mid-infrared laser based on dual microdisks according to claim 1. The plane on which the lower bonding surface (222) is located overlaps the plane on which the upper bonding surface (231) is located,
The pitch between the echo wall microdisk laser (3) and the lower coupling surface (222) is 100 nm, and the pitch between the echo wall microdisk optical parametric oscillator (4) and the upper coupling surface (231) is 100 nm. The pitch of is 100 nm,
A compact mid-infrared laser based on dual microdisks according to claim 1. It further includes a metal case (9), a heat insulating plate is installed inside the metal case (9), and the metal case (9) has an airtight port (91) for filling with nitrogen gas and A wire hole (92) is installed for drawing out the electric control line,
A compact mid-infrared laser based on dual microdisks according to claim 1.