CN216489003U - Multi-wavelength intermediate infrared sequence pulse laser - Google Patents
Multi-wavelength intermediate infrared sequence pulse laser Download PDFInfo
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- CN216489003U CN216489003U CN202123141366.5U CN202123141366U CN216489003U CN 216489003 U CN216489003 U CN 216489003U CN 202123141366 U CN202123141366 U CN 202123141366U CN 216489003 U CN216489003 U CN 216489003U
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Abstract
The utility model provides a multi-wavelength mid-infrared sequence pulse laser, which comprises a pump laser module, a laser Q-switching module, a light beam control module and a mid-infrared laser module which are arranged along a light path; the pump laser module is used for generating continuous pump light; the laser Q-switching module is used for adjusting the intra-cavity loss of the pump laser module so that the continuous pump light forms sequential pulse laser, and the sequential pulse laser is also used as the pump light of the intermediate infrared laser module; the beam control module is used for shaping the beam of the formed sequence pulse laser; the mid-infrared laser module is used for absorbing the sequential pulse laser and forming multi-wavelength mid-infrared laser which is periodically output. As a novel solid laser, the laser has the advantages of being capable of outputting multi-wavelength high-frequency time sequences compared with the existing intermediate infrared laser, high in repetition frequency and peak power of each output wavelength, and very important in expanding the practicability and application range of the intermediate infrared laser.
Description
Technical Field
The utility model relates to the field of laser technology, especially, relate to a multi-wavelength mid-infrared sequence pulse laser.
Background
The mid-infrared band is used as an atmospheric window with minimum attenuation, and has extremely important application value and prospect in the fields of imaging, remote sensing, communication, medical treatment, spectroscopy and the like.
In the prior art, a paper published by crimson people of the university of vinpochology in "photonics press" 2018, 6 th, "based on multicycle MgO: a PPLN inner cavity wide tuning continuous mid-infrared optical parametric oscillator' discloses a new technology for generating 3.2-4.1um continuous mid-infrared laser by an optical parametric oscillator based on a magnesium oxide doped lithium niobate crystal, which is specifically shown in figure 1. In the schematic diagram, the resonant cavity of fundamental frequency light is a flat cavity, and an Optical Parametric Oscillator (OPO) is a V-shaped cavity. The optical parametric oscillator includes an 808nm fiber laser 101, 1: 1.5 of a beam-reducing mirror group 102, a plane mirror 103, Nd: YVO4 crystal 104, a red copper heat sink 105, a focusing lens 106 with the focal length of 150mm, a 15-degree deflection mirror 107, MgO: PPLN crystal 108, a temperature control furnace 109, a plane mirror 110 and a plane mirror 111. Wherein, the pumping light is emitted from the 808nm fiber laser 101, and forms 1064nm fundamental frequency laser oscillation in the resonant cavity 103 → 104 → 106 → 111 through the beam shrinking mirror group 102. Meanwhile, the intracavity device 107 → 108 → 110 → 111 forms a V-shaped cavity which performs optical parametric oscillation under the action of 1064nm fundamental frequency light and outputs signal light and idler frequency light. Wherein the signal light is near infrared band, and the idler frequency light is intermediate infrared band.
The above prior art has the following disadvantages: first, fast switching of wavelengths cannot be achieved. The known technology adopts temperature control and a PPLN crystal translation mode to realize wavelength switching, but the temperature control is usually in minutes, the PPLN crystal translation is in seconds, and quick switching cannot be realized. And secondly, the output laser is continuous laser without pulse laser characteristics. The prior art adopts continuous laser pumping, does not have the characteristics of pulse laser, namely, has no repetition frequency characteristic, and shows that the peak power is extremely low (equal to the average power and the watt level). Thirdly, the light-light conversion efficiency is low. The generation principle of the mid-infrared laser is an Optical Parametric Oscillator (OPO), and the conversion efficiency of the OPO is in positive correlation with the peak power.
Therefore, a new type of sequential pulse laser is needed to solve the problem.
SUMMERY OF THE UTILITY MODEL
In view of the above, embodiments of the present invention provide a multi-wavelength mid-ir train pulse laser to obviate or mitigate one or more of the disadvantages of the prior art.
The technical scheme of the utility model as follows:
the laser comprises a pump laser module, a laser Q-switching module, a light beam control module and a mid-infrared laser module which are arranged along a light path; the pump laser module is used for generating continuous pump light for exciting the intermediate infrared laser module; the laser Q-switching module is used for adjusting the intra-cavity loss of the pump laser module so that the continuous pump light forms sequential pulse laser, and the sequential pulse laser is also used as the pump light of the intermediate infrared laser module; the beam control module is used for carrying out beam shaping on the formed sequence pulse laser and controlling the action period of the sequence pulse laser and the intermediate infrared laser module; the mid-infrared laser module is used for absorbing the sequence pulse laser and forming multi-wavelength mid-infrared laser which is periodically output.
In some embodiments, the pump laser module includes a side pump laser, a first laser crystal, a polarizer, a half-wave plate, an input mirror, and an output mirror arranged along an optical path; wherein the side-pumped laser is used for outputting laser to provide pumping energy for the first laser crystal; the first laser crystal is used for absorbing the energy of the side pumping laser and outputting near-infrared laser; the polarizer is used for controlling the polarization characteristic of a resonant cavity formed in the pump laser module so as to ensure that output laser is polarized laser; the half-wave plate is used for controlling the polarization direction so as to ensure that the polarization of the fundamental frequency light is matched with that of the laser Q-switching module, thereby generating the maximum loss in the cavity; the input mirror is used as a reflector of the resonant cavity to ensure the gain effect of the laser; the output mirror is used as an output mirror of the resonant cavity to ensure the resonant gain of the laser.
In some embodiments, the first laser crystal is a neodymium-doped yttrium aluminum garnet crystal; the side pumping laser is used for outputting 808nm laser; the first laser crystal is used for outputting 1064nm near-infrared laser.
In some embodiments, the laser Q-switch module comprises a first electro-optic Q-switch crystal, a first Q-switch drive, a second electro-optic Q-switch crystal, a second Q-switch drive, and a signal generator; the first electro-optic Q-switching crystal is arranged in an optical path between the output mirror and the first laser crystal, and the first Q-switching drive is connected with the first electro-optic Q-switching crystal; the second electro-optic Q-switching crystal is arranged in an optical path between the half-wave plate and the input mirror, and the second Q-switching drive is connected with the second electro-optic Q-switching crystal; the signal generator is connected with the first Q-switching drive and the second Q-switching drive; wherein the signal generator is used for generating a sequence pulse signal; the first Q-switching drive is used for converting the sequential pulse signals generated by the signal generator into high-voltage electric signals so as to realize the drive control of the first electro-optic Q-switching crystal; the second Q-switching drive is used for converting the sequential pulse signal generated by the signal generator into a high-voltage electric signal so as to realize the drive control of the second electro-optical Q-switching crystal; the first electro-optic Q-switching crystal and the second electro-optic Q-switching crystal are used for generating controllable specific loss in the resonant cavity at the same time so as to ensure complete turn-off of the resonant cavity and generate sequential pulse laser.
In some embodiments, the beam control module includes a focusing mirror, a first fast-yaw mirror, and a second fast-yaw mirror arranged along an optical path; the focusing mirror is used for carrying out beam shaping on the generated sequential pulse laser processed by the laser Q-switching module so as to realize effective pumping of the intermediate infrared laser module; the first fast deflection mirror is used for periodically adjusting the transmission direction of the sequence pulse laser so as to realize periodic pumping of the intermediate infrared laser module and further obtain multi-wavelength intermediate infrared sequence pulse laser; and the second quick deflection mirror is used for realizing the spatial output of the multi-wavelength mid-infrared laser excited by the mid-infrared laser module.
In some embodiments, the second fast deflection mirror is a controllable deflection mirror, the light beam control module further includes a deflection mirror controller connected to the second fast deflection mirror, the deflection mirror controller is configured to generate a control signal and output the control signal to the second fast deflection mirror, and the second fast deflection mirror performs angle control in response to the control signal to realize parallel emission.
In some embodiments, the mid-infrared laser module includes a second laser crystal for absorbing pump light energy and outputting mid-infrared laser light through the action of optical parametric oscillation.
In some embodiments, the second laser crystal is a sector PPLN crystal for combining the second fast swing mirror and a swing mirror controller to obtain a multi-wavelength mid-infrared laser.
In some embodiments, the fan-shaped PPLN crystal is a multi-period PPLN crystal with two-side coated films, the period of the multi-period PPLN crystal is 29um/29.5um/30um, the input end of the multi-period PPLN crystal is coated with a film with a high transmittance of 1064nm and a high reflectance of 1.4-1.6um and 3.6-4.5um, the output end of the multi-period PPLN crystal is coated with a film with a high reflectance of 1064nm and a high reflectance of 1.4-1.6um and a high reflectance of 3.6-4.5um, and the transmittance is 10%; the focusing lens is a positive lens with the focal length f being 200 mm; the output mirror is a plane mirror with a coating film of 1064nm and 40% of transmittance; the side pumping laser is a 880nm semiconductor laser; the neodymium-doped yttrium aluminum garnet crystal is an yttrium aluminum garnet crystal with neodymium being doped by 0.5 percent; the polarizer is a polarization selection device; the half-wave plate is a plane mirror with 1064nm retardation 1/2 lambda; the input mirror is a plane mirror with 1064nm high reflection; the first Q-switching drive and the second Q-switching drive are drivers for generating high-voltage electricity; the first electro-optic Q-switching crystal and the second electro-optic Q-switching crystal are RTP crystals which respond to the first Q-switching drive and the second Q-switching drive and generate 90% of maximal loss to 1064 nm; the signal generator is used for generating a sequence pulse signal.
In some embodiments, after the laser reaches a steady state, the laser outputs multi-wavelength mid-infrared sequence pulse lasers with the wavelengths of 3.8um, 3.9um and 4.0 um.
According to the utility model discloses infrared sequence pulse laser in multi-wavelength, the beneficial effect that can obtain includes at least:
as a novel solid laser, the multi-wavelength intermediate infrared sequence pulse laser has the advantages of being capable of outputting multi-wavelength high-frequency time sequences compared with the existing intermediate infrared laser, high in repetition frequency and peak power and important in expanding the practicability and application range of the intermediate infrared laser.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For convenience in illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary device actually manufactured according to the present invention. In the drawings:
fig. 1 is a schematic diagram of a structural principle of an optical parametric oscillator in the prior art.
Fig. 2 is a schematic structural diagram of a multi-wavelength mid-ir train pulse laser according to an embodiment of the present invention.
Reference numerals:
1. a yaw mirror controller; 2. a second fast deflection mirror; 3. a second laser crystal; 4. a first fast yaw mirror; 5. a focusing mirror; 6. an output mirror; 7. side pumped laser; 8. a first laser crystal; 9. a polarizer; 10. a half-wave plate; 11. an input mirror; 12. a first Q-switched drive; 13. a first electro-optic Q-switching crystal; 14. a signal generator; 15. a second Q-switched drive; 16. a second electro-optic Q-switching crystal;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and/or process steps that are closely related to the solution according to the invention are shown in the drawings, while other details that are not relevant to the invention are omitted.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
The utility model provides a multi-wavelength mid-infrared sequence pulse laser to solve or alleviate the unable wavelength fast switch over of laser among the prior art and unable output pulse laser scheduling problem.
In some embodiments, the laser includes a pump laser module, a laser Q-switching module, a beam steering module, and a mid-infrared laser module arranged along an optical path.
Wherein the pump laser module is used for generating continuous pump light for exciting the intermediate infrared laser module. The laser Q-switching module is used for adjusting the loss in the cavity of the pump laser module to form a sequence pulse laser, and the sequence pulse laser is also used as the pump light of the intermediate infrared laser module. The light beam control module is used for carrying out light beam shaping on the formed sequence pulse laser and controlling the action period of the sequence pulse laser and the intermediate infrared laser module so as to form multi-wavelength intermediate infrared laser which is periodically output. And the intermediate infrared laser module is used for absorbing the sequence pulse laser and exciting multi-wavelength intermediate infrared laser.
In the above embodiment, the multi-wavelength mid-infrared sequence pulse laser, as a novel solid laser, has multi-wavelength high-frequency time sequence output compared with the existing mid-infrared laser, and each output wavelength has the characteristics of high repetition frequency and high peak power, and has very important significance in expanding the practicability and application range of the mid-infrared laser.
Fig. 2 is a schematic structural diagram of a multi-wavelength mid-ir sequence pulse laser in an embodiment of the present invention, as shown in fig. 2, the pump laser module is used to generate continuous pump light, and includes a side pump laser 7, a first laser crystal 8, a polarizer 9, a half-wave plate 10, an input mirror 11, and an output mirror 6 arranged along a light path.
Wherein the side-pumped laser 7 is used to output laser light to provide pumping energy to the first laser crystal 8. The first laser crystal 8 is used for absorbing the energy of the side pumping laser 7 and outputting near-infrared laser. The polarizer 9 is used for controlling the polarization characteristic of a resonant cavity formed in the pump laser module to ensure that the output laser is polarized laser. The half-wave plate 10 is used for controlling the polarization direction to ensure that the polarization of the fundamental frequency light is matched with that of the laser Q-switching module, so that the maximum loss in the cavity is generated. The input mirror 11 is used as a reflector of the resonant cavity to ensure the gain effect of the laser; the output mirror 6 is used as an output mirror 6 of the resonant cavity to ensure the resonant gain of the laser.
In this embodiment, the pump light of the laser is emitted by a side pump laser 7, pumping a first laser crystal 8 such that λ1The spectral line makes a transition in the first laser crystal 8 and forms laser oscillation in the resonant cavity (13 → 8 → 11), and forms continuous laser light with adjustable polarization direction under the action of the polarizer 9 and the half-wave plate 10.
In the above-described embodiment, the side pump laser light 7 supplies pump energy to the first laser crystal 8 from the side thereof, that is, the side pump laser light 7 lases the first laser crystal 8 from the side thereof.
Here, 880nm semiconductor laser may be used as the side pumping laser 7 to output 808nm laser; the first laser crystal 8 is used for outputting 1064nm near-infrared laser, and may be a neodymium-doped yttrium aluminum garnet crystal, and further, the neodymium-doped yttrium aluminum garnet crystal is an yttrium aluminum garnet crystal with 0.5% neodymium doped. But is not limited thereto. In other embodiments, the first laser crystal 8 may also be a single-end-pumped or double-end-pumped laser crystal, and the direction of the side-pumped laser 7 using the energy for pumping needs to be changed accordingly. For example, when the first laser crystal 8 is a single-end-face pumped laser crystal, a semiconductor laser or other pump source is used to provide pumping energy to the single-end-face pumped first laser crystal 8. Here, the side-pumped laser 7 may also be other forms of pumping sources, such as flash lamps, light emitting diodes, etc.
In some embodiments, as shown in fig. 2, the laser Q-switching module is used for intra-cavity loss adjustment of a pump laser to form a sequential pulse laser, and includes a first electro-optical Q-switching crystal 13, a first Q-switching driver 12, a second electro-optical Q-switching crystal 16, a second Q-switching driver 15, and a signal generator 14.
Wherein the first electro-optic Q-switching crystal 13 is arranged in the optical path between the output mirror 6 and the first laser crystal 8, and the first Q-switching driver 12 is connected with the first electro-optic Q-switching crystal 13. The second electro-optic Q-switching crystal 16 is arranged in the optical path between the half-wave plate 10 and the input mirror 11, and the second Q-switching driver 15 is connected with the second electro-optic Q-switching crystal 16. The signal generator 14 is connected to the first Q-switched driver 12 and the second Q-switched driver 15.
The working principle of the laser Q-switching module is as follows: the signal generator 14 is used for generating a sequence pulse signal; the first Q-switching driver 12 is configured to convert the sequential pulse signal generated by the signal generator 14 into a high-voltage electrical signal to implement driving control on the first electro-optical Q-switching crystal 13; the second Q-switching driver 15 is configured to convert the sequential pulse signal generated by the signal generator 14 into a high-voltage electrical signal to implement driving control on the second electro-optical Q-switching crystal 16; the first electro-optic Q-switching crystal 13 and the second electro-optic Q-switching crystal 16 are used for generating controllable specific loss in the resonant cavity at the same time so as to ensure complete turn-off of the resonant cavity, and therefore, the sequential pulse laser is generated.
In this embodiment, the signal generator 14 generates a serial pulse signal, converts the serial pulse signal into a high voltage signal by the first Q-switch driver 12 (electro-optical driver) and the second Q-switch driver 15 (electro-optical driver), and forms an intra-cavity specific loss through the first electro-optical Q-switch crystal 13 and the second electro-optical Q-switch crystal 16, and finally converts the continuous laser light into a serial pulse laser light.
In some embodiments, the beam control module is used for beam shaping of the sequential pulse laser and controlling the action period of the sequential pulse laser and the mid-infrared crystal, and comprises a focusing mirror 5, a first fast deflection mirror 4 and a second fast deflection mirror 2 which are arranged along the optical path.
The focusing mirror 5 is used for beam shaping of the generated sequential pulse laser processed by the laser Q-switching module so as to realize effective pumping of the intermediate infrared laser module; the first fast deflection mirror 4 is used for periodically adjusting the transmission direction of the sequence pulse laser so as to realize periodic pumping of the intermediate infrared laser module and further obtain multi-wavelength intermediate infrared sequence pulse laser; the second fast deflection mirror 2 is used for realizing spatial output of the multi-wavelength mid-infrared laser excited by the mid-infrared laser module.
In the above embodiment, the second fast deflection mirror 2 is a controllable deflection mirror, the light beam control module further includes a deflection mirror controller 1 connected to the second fast deflection mirror 2, the deflection mirror controller 1 is configured to generate a control signal and output the control signal to the second fast deflection mirror 2, and the second fast deflection mirror 2 performs angle control in response to the control signal to realize parallel emission.
In some embodiments, the mid-infrared laser module includes a second laser crystal 3, the second laser crystal 3 is a mid-infrared crystal, and the second laser crystal 3 is configured to absorb pump light energy and output mid-infrared laser light through the effect of optical parametric oscillation.
Here, the second laser crystal 3 may be a sector-shaped PPLN crystal for combining the second fast swing mirror 2 and the swing mirror controller 1 to obtain a multi-wavelength mid-infrared laser.
In the above embodiment, the sequential pulse laser is coupled into the sector PPLN crystal (where D polarization periods are engraved in the sector PPLN crystal) under the action of the focusing mirror 5 and the first fast tilting mirror 4, and the tilting mirror controller 1 is synchronously controlled in time sequence to generate a control signal of H × D repetition frequency according to the repetition frequency H generated by the signal generator 14, so as to ensure that each sequential pulse enters the sector PPLN crystal in a periodic deflection manner to generate a periodic multi-wavelength mid-infrared sequential pulse laser. Finally, the emitted multi-wavelength mid-infrared sequence pulse laser is controlled by the second fast deflection mirror 2 to realize parallel emission.
The output laser of the pump laser module after the action of the laser Q-switching module is serial pulse laser, the serial pulse laser is used as pump light to directly pump the fan-shaped PPLN crystal, and the obtained mid-infrared laser is pulse serial laser; the fan-shaped PPLN crystal is used for absorbing the energy of the pump light and outputting the mid-infrared laser through the action of optical parametric oscillation. The fan-shaped PPLN crystal generates mid-infrared laser, and the multi-wavelength mid-infrared laser can be obtained by combining the second fast swing mirror 4 and the swing mirror controller 1.
In some embodiments, the fan-shaped PPLN crystal is a multi-period PPLN crystal with two-side coated films, the period of the multi-period PPLN crystal is 29um/29.5um/30um, the input end of the multi-period PPLN crystal is coated with a film with a high transmittance of 1064nm and a high reflectance of 1.4-1.6um and 3.6-4.5um, the output end of the multi-period PPLN crystal is coated with a film with a high reflectance of 1064nm and a high reflectance of 1.4-1.6um and a high reflectance of 3.6-4.5um, and the transmittance is 10%; the focusing lens 5 is a positive lens with the focal length f being 200 mm; the output mirror 6 is a plane mirror with a coated 1064nm transmittance of 40%; the side pumping laser 7 is a 880nm semiconductor laser; the neodymium-doped yttrium aluminum garnet crystal is an yttrium aluminum garnet crystal with neodymium being doped by 0.5 percent; the polarizer 9 is a polarization selection device; the half-wave plate 10 is a plane mirror with 1064nm retardation 1/2 lambda; the input mirror 11 is a plane mirror with a high reflection of 1064 nm; the first Q-switched driver 12 and the second Q-switched driver 15 are drivers for generating high voltage electricity; the first electro-optic Q-switching crystal 13 and the second electro-optic Q-switching crystal 16 are RTP crystals which respond to the first Q-switching drive 12 and the second Q-switching drive 15 and generate 90% of maximum loss to 1064 nm; the signal generator 14 is a signal generator 14 that generates a train of pulse signals.
In some embodiments, after the laser reaches a steady state, the laser outputs multi-wavelength mid-infrared sequence pulse lasers with the wavelengths of 3.8um, 3.9um and 4.0 um.
The utility model discloses an infrared sequence pulse laser ware in multi-wavelength carries out the pumping with sequence pulse laser to fan-shaped PPLN crystal, can produce the sequence pulse laser of high repetition frequency, high peak power. Meanwhile, through the angle control of the rapid deflection mirror, mid-infrared sequence pulse laser output in a multi-wavelength time sequence can be generated, the generated mid-infrared laser has the advantages of high repetition frequency, high peak power, high conversion efficiency and multi-wavelength time sequence emission, and the laser has the characteristics of high repetition frequency, high peak power and multi-wavelength time sequence output, so that the application potential and the application value of the mid-infrared laser in the fields can be effectively improved.
According to the utility model discloses infrared sequence pulse laser in multi-wavelength, the beneficial effect that can obtain includes at least:
(1) the utility model provides a multi-wavelength mid-infrared sequence pulse laser uses sequence pulse laser as the pumping source to carry out the pumping to fan-shaped PPLN crystal, and the mid-infrared pulse laser who obtains has the advantage such as high peak power, high repetition frequency and highlight-light conversion efficiency.
(2) The utility model provides a multi-wavelength mid-infrared sequence pulse laser realizes the periodic pumping to fan-shaped PPLN crystal with quick beat mirror, and the mid-infrared laser that obtains has the characteristics of multi-wavelength chronogenesis output.
(3) The utility model provides a multi-wavelength mid-infrared sequence pulse laser uses sequence laser as pump laser, combines quick deflection mirror to carry out periodic pumping to fan-shaped PPLN crystal, and the mid-infrared laser that obtains has high peak power (kilowatt level), high repetition frequency (100kHz), highlight-light conversion efficiency (wavelength > 3.8um, luminous efficiency > 10%) and the advantage of multi-wavelength chronogenesis output (wavelength switching time is kHz).
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The multi-wavelength intermediate infrared sequence pulse laser is characterized by comprising a pump laser module, a laser Q-switching module, a beam control module and an intermediate infrared laser module which are arranged along a light path;
the pump laser module is used for generating continuous pump light for exciting the intermediate infrared laser module;
the laser Q-switching module is used for adjusting the intra-cavity loss of the pump laser module so that the continuous pump light forms sequential pulse laser, and the sequential pulse laser is also used as the pump light of the intermediate infrared laser module;
the beam control module is used for carrying out beam shaping on the formed sequence pulse laser and controlling the action period of the sequence pulse laser and the intermediate infrared laser module;
the mid-infrared laser module is used for absorbing the sequence pulse laser and forming multi-wavelength mid-infrared laser which is periodically output.
2. The multi-wavelength mid-ir train pulse laser of claim 1, wherein the pump laser module comprises a side pump laser, a first laser crystal, a polarizer, a half-wave plate, an input mirror and an output mirror arranged along an optical path;
wherein the side-pumped laser is used for outputting laser to provide pumping energy for the first laser crystal;
the first laser crystal is used for absorbing the energy of the side pumping laser and outputting near-infrared laser;
the polarizer is used for controlling the polarization characteristic of a resonant cavity formed in the pump laser module so as to ensure that output laser is polarized laser;
the half-wave plate is used for controlling the polarization direction so as to ensure that the polarization of the fundamental frequency light is matched with that of the laser Q-switching module, thereby generating the maximum loss in the cavity;
the input mirror is used as a reflector of the resonant cavity to ensure the gain effect of the laser;
the output mirror is used as an output mirror of the resonant cavity to ensure the resonant gain of the laser.
3. The multi-wavelength mid-infrared sequence pulse laser as claimed in claim 2, wherein the first laser crystal is a neodymium-doped yttrium aluminum garnet crystal;
the side pumping laser is used for outputting 808nm laser;
the first laser crystal is used for outputting 1064nm near-infrared laser.
4. The multi-wavelength mid-infrared sequential pulse laser as claimed in claim 3, wherein the laser Q-switching module comprises a first electro-optic Q-switching crystal, a first Q-switching driver, a second electro-optic Q-switching crystal, a second Q-switching driver and a signal generator;
the first electro-optic Q-switching crystal is arranged in an optical path between the output mirror and the first laser crystal, and the first Q-switching drive is connected with the first electro-optic Q-switching crystal;
the second electro-optic Q-switching crystal is arranged in an optical path between the half-wave plate and the input mirror, and the second Q-switching drive is connected with the second electro-optic Q-switching crystal;
the signal generator is connected with the first Q-switching drive and the second Q-switching drive;
wherein the signal generator is used for generating a sequence pulse signal;
the first Q-switching drive is used for converting the sequential pulse signals generated by the signal generator into high-voltage electric signals so as to realize the drive control of the first electro-optic Q-switching crystal;
the second Q-switching drive is used for converting the sequential pulse signal generated by the signal generator into a high-voltage electric signal so as to realize the drive control of the second electro-optical Q-switching crystal;
the first electro-optic Q-switching crystal and the second electro-optic Q-switching crystal are used for generating controllable specific loss in the resonant cavity at the same time so as to ensure complete turn-off of the resonant cavity and generate sequential pulse laser.
5. The multi-wavelength mid-IR sequence pulse laser according to claim 4, wherein the beam steering module comprises a focusing mirror, a first fast-yaw mirror and a second fast-yaw mirror arranged along the optical path;
the focusing mirror is used for carrying out beam shaping on the generated sequential pulse laser processed by the laser Q-switching module so as to realize effective pumping of the intermediate infrared laser module;
the first fast deflection mirror is used for periodically adjusting the transmission direction of the sequence pulse laser so as to realize periodic pumping of the intermediate infrared laser module and further obtain multi-wavelength intermediate infrared sequence pulse laser;
and the second quick deflection mirror is used for realizing the spatial output of the multi-wavelength mid-infrared laser excited by the mid-infrared laser module.
6. The multi-wavelength mid-IR sequence pulse laser according to claim 5, wherein the second fast deflection mirror is a controllable deflection mirror, the beam control module further comprises a deflection mirror controller connected to the second fast deflection mirror, the deflection mirror controller is configured to generate a control signal and output the control signal to the second fast deflection mirror, and the second fast deflection mirror performs angle control in response to the control signal to realize parallel emission.
7. The multi-wavelength mid-infrared sequence pulse laser as claimed in claim 6, wherein the mid-infrared laser module comprises a second laser crystal for absorbing pump light energy and outputting mid-infrared laser light by the action of optical parametric oscillation.
8. The multi-wavelength mid-ir sequenced pulse laser as claimed in claim 7 wherein said second laser crystal is a fan shaped PPLN crystal used in conjunction with said second fast swing mirror and a swing mirror controller to obtain a multi-wavelength mid-ir laser.
9. The multi-wavelength mid-infrared sequence pulse laser according to claim 8,
the fan-shaped PPLN crystal is a multi-period PPLN crystal with two-side coated films, the period of the fan-shaped PPLN crystal is 29um/29.5um/30um, the input end of the fan-shaped PPLN crystal is coated with a film with the wavelength of 1064nm high-transmittance and 1.4-1.6um and 3.6-4.5um high-reflectance, the output end of the fan-shaped PPLN crystal is coated with a film with the wavelength of 1064nm high-transmittance and 1.4-1.6um high-reflectance and 3.6-4.5um, and the transmittance is 10%;
the focusing lens is a positive lens with the focal length f being 200 mm;
the output mirror is a plane mirror with a coated 1064nm transmittance of 40%;
the side pumping laser is a 880nm semiconductor laser;
the neodymium-doped yttrium aluminum garnet crystal is an yttrium aluminum garnet crystal with neodymium being doped by 0.5 percent;
the polarizer is a polarization selection device;
the half-wave plate is a plane mirror with 1064nm retardation 1/2 lambda;
the input mirror is a plane mirror with 1064nm high reflection;
the first Q-switching drive and the second Q-switching drive are drivers for generating high-voltage electricity;
the first electro-optic Q-switched crystal and the second electro-optic Q-switched crystal are RTP crystals which respond to a first Q-switched drive and a second Q-switched drive and generate 90% of maximal loss to 1064 nm;
the signal generator is used for generating a sequence pulse signal.
10. The multi-wavelength mid-infrared sequence pulse laser according to any one of claims 1 to 9, wherein the laser outputs multi-wavelength mid-infrared sequence pulse laser with wavelengths of 3.8um, 3.9um, 4.0um after reaching a steady state.
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