CN220527389U - Single-frequency high-energy 2 mu m laser for coherent detection - Google Patents
Single-frequency high-energy 2 mu m laser for coherent detection Download PDFInfo
- Publication number
- CN220527389U CN220527389U CN202322066188.7U CN202322066188U CN220527389U CN 220527389 U CN220527389 U CN 220527389U CN 202322066188 U CN202322066188 U CN 202322066188U CN 220527389 U CN220527389 U CN 220527389U
- Authority
- CN
- China
- Prior art keywords
- reflecting mirror
- laser
- degree reflecting
- degree
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 230000001427 coherent effect Effects 0.000 title claims abstract description 36
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 238000002834 transmittance Methods 0.000 claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims description 46
- 239000013078 crystal Substances 0.000 claims description 37
- 239000011521 glass Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000005350 fused silica glass Substances 0.000 claims description 11
- 230000035559 beat frequency Effects 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- 230000000737 periodic effect Effects 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 241000357437 Mola Species 0.000 description 1
- IXUZXIMQZIMPSQ-ZBRNBAAYSA-N [(4s)-4-amino-4-carboxybutyl]azanium;(2s)-2-amino-4-hydroxy-4-oxobutanoate Chemical compound OC(=O)[C@@H](N)CCC[NH3+].[O-]C(=O)[C@@H](N)CC(O)=O IXUZXIMQZIMPSQ-ZBRNBAAYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012826 global research Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Lasers (AREA)
Abstract
The utility model provides a single-frequency high-energy 2 mu m laser for coherent detection, which is characterized in that a 45-degree mirror reflector component I and a 0-degree mirror form a 2 mu m wave band ring laser together, an external reflection triangular prism and a 0-degree plane mirror are combined together to effectively compress the cavity length of the laser, one path of output of a single-frequency seed laser is injected into a laser resonant cavity through a part of transmittance mirror surface of a third 45-degree mirror I, a piezoelectric ceramic actuator is connected with a first 45-degree mirror I, periodic interference is generated by the single-frequency seed laser through expansion and contraction, a photoelectric detector detects a periodic interference signal of the seed laser, and whether an acousto-optic Q-switching element opens a door is controlled according to the detected interference peak. The utility model solves the defects of overlarge volume and low integration level of the existing high-energy single-frequency 2 mu m laser, meets the space application condition, can realize high-integration design and can realize stable operation of laser with pulse width of more than 200ns, energy of more than 200mJ and line width of less than 5 MHz.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a single-frequency high-energy 2 mu m laser for coherent detection.
Background
The space all-solid-state laser is a core light source of the space laser radar, is widely applied to the fields of laser altimetry, laser remote sensing, laser communication, laser countermeasure and the like, and has extremely high requirements on the mechanical environment adaptability of the laser besides requiring the laser to have extremely high optical indexes. With global wind field detection, CO 2 Space lasers are gradually developed from 1 μm to 2 μm near infrared and from direct detection to coherent detection. All-solid-state lasers for spatial coherence detection require the characteristics of long pulse width, high energy, single frequency of the emitted laser, whereas the pulse width of all-solid-state lasers is positively correlated with the laser cavity length.
Spatial lasers typically emit at 1064nm wavelength, with pulse widths shorter than 20ns, energies on the order of tens mJ, line widths of hundred GHz, e.g., calipso, LOLA, MOLA, etc., for atmospheric detection, distance measurement, etc. The detection of the global wind field is also becoming a global research hotspot for more than 10 years, one important technology of wind field detection is coherent detection, and a laser used for spatial coherent detection requires that the laser emission wavelength is 2 μm band and the linewidth is less than 10MHz in order to improve the coherence of laser. The existing 2 mu m wave band high-energy single-frequency laser generally adopts a seed injection locking mode, and resonant cavities such as torsional modes or annular cavities are selected according to different used media.
Usually, a torsion die cavity or an 8-shaped annular cavity design is adopted for 2 mu m, and the laser has overlarge volume and low integration level, and is difficult to meet the satellite-borne coherent detection requirement.
Therefore, the use of the conventional 2 μm-band pulse single-frequency laser is greatly limited in the space laser remote sensing environment.
Disclosure of Invention
The utility model provides a single-frequency high-energy 2 mu m laser for coherent detection, which aims to solve the problem that a 2 mu m laser is applied in a remote sensing environment, wherein a 45-degree mirror reflector component I and a 0-degree reflector jointly form a 2 mu m wave band ring laser, an external reflection triangular prism and a 0-degree plane reflector are jointly combined to effectively compress the cavity length of the laser, the plane size of the laser can be reduced by more than 30 percent under the condition that the cavity length of the laser is unchanged, and the laser has good self-adaptive capacity to external vibration interference; the single-frequency seed laser has two paths of laser outputs, one path is used for beat frequency detection, the other path is injected into a laser resonant cavity through a part of transmittance mirror surface of a third 45-degree reflecting mirror I, one surface of the third 45-degree reflecting mirror I is plated with a 2 mu m wave band antireflection film, the other surface of the third 45-degree reflecting mirror I is plated with a medium film with transmittance of 10% -50%, a piezoelectric ceramic actuator is connected with the first 45-degree reflecting mirror I to enable the single-frequency seed laser to generate periodic interference through stretching, a photoelectric detector is positioned behind the second 45-degree reflecting mirror I to detect periodic interference signals of the seed laser, and whether an acousto-optic Q-switching element opens a door is controlled according to the detected interference peaks: the utility model solves the defects of overlarge volume and low integration level of the existing high-energy single-frequency 2 mu m laser, meets the space application condition, can realize high-integration design and can realize stable operation of laser with pulse width of more than 200ns, energy of more than 200mJ and line width of less than 5 MHz.
The utility model provides a single-frequency high-energy 2 mu m laser for coherent detection, which comprises a laser side pump module, a polarization beam splitter, a 45-degree reflecting mirror component I, a compensating lens component, an optical wedge component, an external reflecting triangular prism and a 0-degree reflecting mirror, wherein the optical wedge component is arranged on the side of the laser side pump module;
the 45-degree reflecting mirror assembly I comprises a first 45-degree reflecting mirror I, a second 45-degree reflecting mirror I, a third 45-degree reflecting mirror I and a fourth 45-degree reflecting mirror I, the compensating lens assembly comprises a first compensating lens and a second compensating lens, and the optical wedge assembly comprises a first optical wedge and a second optical wedge;
the external reflection triangular prism comprises a bottom surface S1, a first side surface S2 and a second side surface S3 which are intersected with the bottom surface S1 respectively, wherein the first side surface S2 and the second side surface S3 are intersected at the top;
the polarization beam splitter and the first 45-degree reflecting mirror I are sequentially arranged on one side output light path of the laser side pump module, and the first 45-degree reflecting mirror I turns the light path by 45 degrees; the first compensation lens, the first optical wedge and the second 45-degree reflecting mirror I are sequentially arranged on an output light path of the first 45-degree reflecting mirror I, and the second 45-degree reflecting mirror I turns the light path by 45 degrees; the third 45-degree reflecting mirror I is arranged on the output light path of the second 45-degree reflecting mirror I;
the fourth 45-degree reflecting mirror I is arranged on the other side output light path of the laser side pump module, and turns the light path by 45 degrees; the second compensation lens, the second optical wedge and the external reflection triangular prism are sequentially arranged on the output light path of the fourth 45-degree reflecting mirror I, the first side surface S2 faces the output light path of the second optical wedge, and the second side surface S3 faces the input light path of the third 45-degree reflecting mirror I;
the 0-degree reflecting mirror is arranged on the output light path of the external reflection triangular prism;
the first side S2 reflects the output light of the second optical wedge to the 0-degree reflecting mirror, the 0-degree reflecting mirror reflects the output light to the second side S3, and the second side S3 makes optical path turning and reflects the output light to the third 45-degree reflecting mirror I.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is used as a preferable mode and further comprises a single-frequency seed laser, a frequency shifter, an isolator and a 45-degree reflecting mirror assembly II, wherein the frequency shifter, the isolator and the 45-degree reflecting mirror assembly II are sequentially arranged on an output optical path of the single-frequency seed laser, the 45-degree reflecting mirror assembly II comprises a first 45-degree reflecting mirror II and a second 45-degree reflecting mirror II which are sequentially arranged, the first 45-degree reflecting mirror II carries out 45-degree optical path turning on output light of the isolator to be output to the second 45-degree reflecting mirror II, and the second 45-degree reflecting mirror II carries out 45-degree optical path turning on the output light to be output to a third 45-degree reflecting mirror I;
one side of the third 45-degree reflecting mirror I, which faces the external reflecting triangular prism, and one side of the second 45-degree reflecting mirror I is plated with a 2 mu m wave band antireflection film, the other side is plated with a dielectric film with the transmittance of 10% -50%, and the third 45-degree reflecting mirror I transmits the output light part of the second 45-degree reflecting mirror II to the second 45-degree reflecting mirror I.
In the single-frequency high-energy 2 μm laser for coherent detection, the top included angle between the first side surface S2 and the second side surface S3 is 92-100 degrees.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is used as an optimal mode and further comprises an acousto-optic Q-switching element arranged on an optical path between a second 45-degree reflecting mirror I and a third 45-degree reflecting mirror I, a piezoelectric ceramic actuator connected with the rear side of the first 45-degree reflecting mirror I and a photoelectric detector arranged on one side of the second 45-degree reflecting mirror I.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is characterized in that the laser crystal of a laser side pump module is any one of the following modes: tm, ho: YLF crystal, tm, ho: YAG crystal, tm, ho: YAP crystal, tm: YLF crystal, tm: YAG crystal, tm: YAP crystal and Tm: Y 2 O 3 A crystal;
the pumping wavelength of the laser diode of the laser side pumping module is 780 nm-800 nm.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is characterized in that a polarization beam splitter is used as a preferable mode and is any one of the following: 45-degree polarizing plate beam splitter, brewster angle polarizing plate beam splitter and polarizing beam splitter cube, wherein the polarizing beam splitter is made of any one of the following materials: ultraviolet fused silica, N-SF1 glass, and H-LaK67 glass.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is characterized in that the side surfaces of a first 45-degree reflecting mirror I, a second 45-degree reflecting mirror I and a fourth 45-degree reflecting mirror I are polished and plated with a high-reflection film with a wave band of 45+/-3 DEG and 2 mu m and an antireflection film with a wavelength of 792 nm;
the first compensation lens and the second compensation lens are both curved lenses, and two surfaces of the first compensation lens and the second compensation lens are plated with 2 mu m wave band antireflection films;
the angles of the first optical wedge and the second optical wedge are 0.5-5 degrees, and two sides of the first optical wedge and the second optical wedge are plated with 2 mu m wave band antireflection films;
the first inclined plane S2 and the second inclined plane S3 are plated with 2 mu m wave band high-reflection films; the 0 DEG plane mirror is plated with a 0 + -10 DEG 2 mu m high reflection film.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is characterized in that a 45-degree reflecting mirror component I, a compensating lens component, an optical wedge component, an external reflecting triangular prism, a 0-degree reflecting mirror and a 45-degree reflecting mirror component II are all made of any one of the following materials: JGS1 glass, JGS3 glass, 7979 glass, and 7980 glass.
The utility model relates to a single-frequency high-energy 2 mu m laser for coherent detection, which is characterized in that a 45-degree reflecting mirror component II is used for reflecting seed light as a preferable mode;
the single-frequency seed laser module is an optical fiber DFB laser which emits 2 mu m single-frequency laser and has a linewidth smaller than 30kHz, and outputs two paths through an optical fiber beam splitter, wherein one path is used for beat frequency detection, and the other path is injected into the laser;
the frequency shifter uses homologous double-path acousto-optic frequency shifting, the frequency shifter is made of fused quartz crystal, two sides of the frequency shifter are plated with 2 mu m wave band antireflection films, and the frequency shifting amount is 40-120 MHz;
the isolator is a magneto-optical crystal having a deflection angle.
According to the single-frequency high-energy 2 mu m laser for coherent detection, as an optimal mode, an acousto-optic Q-switching element uses fused quartz crystals, and two sides of the element are plated with 2 mu m wave band antireflection films;
the photodetector uses an enhanced InGaAs photodetector or a PbS detector;
the piezoelectric ceramic actuator is a cylindrical piezoelectric ceramic actuator and an annular piezoelectric ceramic actuator.
The utility model solves the defects of overlarge volume and low integration level of the traditional high-energy single-frequency 2 mu m laser by a novel single-frequency high-energy 2 mu m laser for coherent detection, meets the space application condition, can realize high-integration design, and can realize stable operation of laser with pulse width of more than 200ns, energy of more than 200mJ and line width of less than 5 MHz.
The utility model provides a novel single-frequency high-energy 2 mu m laser for coherent detection, which is applied to laser wind-finding radar, greenhouse gas detection laser radar and other applications, and comprises the following components: the device comprises a laser side pump module, a polarizing element, a 45-degree reflecting mirror I, a compensating lens, an optical wedge, an external reflecting triangular prism, a 0-degree plane reflecting mirror, an acousto-optic Q-switching element, a 45-degree partial transmittance mirror, a single-frequency optical fiber seed laser module, a frequency shifter, an isolator, a 45-degree reflecting mirror II, a photoelectric detector and a piezoelectric ceramic actuator;
the 45-degree mirror reflector component I and the 0-degree reflector jointly form a 2-mu m-wave band ring laser, and the five 45-degree mirror reflectors are plated with a 45-degree +/-3-degree high-reflection film with the 2-mu m wave band and are anti-reflection with the wavelength of 792 nm; the side surface of the external reflection right angle prism is polished, and inclined planes S2 and S3 are plated with a 2 mu m wave band high-reflection film and a 0 DEG reflecting mirror and a 2 mu m wave band 0 DEG high-reflection film;
the single-frequency seed laser is injected into a laser resonant cavity through a partial transmittance mirror surface of a third 45-degree reflecting mirror I, one surface of the third 45-degree reflecting mirror I is plated with a 2-mu m wave band antireflection film, the other surface of the third 45-degree reflecting mirror I is plated with a partial transmittance dielectric film, a piezoelectric ceramic actuator is connected with the 45-degree reflecting mirror, the single-frequency seed laser generates periodic interference through expansion and contraction, and a photoelectric detector is positioned behind a special coated 45-degree plane mirror and detects a periodic interference signal of the seed laser;
optionally, the laser crystal of the laser side pump module is selected from one of the following crystals: tm, ho: YLF, tm, ho: YAG crystal, tm, ho: YAP crystal, tm: YLF, tm: YAG crystal, tm: YAP crystal, tm: Y 2 O 3 Crystals, etc.;
optionally, the pumping wavelength of the laser diode of the laser side pump module is selected to be a certain wavelength between 780nm and 800 nm;
optionally, the polarizing element may be one of a 45 ° polarizing plate beam splitter, a brewster angle polarizing plate beam splitter and a polarizing beam splitter cube, and is made of one of ultraviolet fused quartz, N-SF1 glass and H-LaK67 glass;
a 45-degree reflecting mirror I is plated with a 45+/-3-degree 2-mu m-wave band high-reflection film and a 792-nm anti-reflection film;
the compensation lens is a curved lens and is used for compensating the laser mode in the resonant cavity, and two sides of the compensation lens are plated with 2 mu m wave band antireflection films;
the optical wedge is a flat inclined mirror with an angle of 0.5-5 degrees, and two sides of the optical wedge are plated with 2 mu m wave band antireflection films;
the inclined planes S2 and S3 of the external reflection triangular prism are plated with high reflection films with the wave band of 2 mu m, laser is reflected at the inclined planes, and the obtuse angle of the external reflection triangular prism is 92-100 degrees;
the 0-degree plane reflecting mirror is plated with a 0+ -10-degree 2 μm high-reflection film;
the external reflection triangular prism and the 0-degree plane reflecting mirror are combined together to effectively compress the cavity length of the laser, and ensure that the laser has good self-adaptive capacity to external vibration interference, and even if the external reflection triangular prism deflects in one dimension, the laser emergent is not influenced;
the acousto-optic Q-switching element adopts fused quartz crystal, and two sides of the element are plated with 2 mu m wave band antireflection films;
the acousto-optic Q-switching element outputs coupling transmittance through voltage regulation, the photoelectric detector detects a resonance signal and feeds back the resonance signal, and the acousto-optic Q-switching element receives a trigger signal when the highest peak of the resonance signal is detected;
a 45-degree partial transmittance mirror, one surface of which is plated with a 2 mu m wave band antireflection film and the other surface of which is plated with a partial transmittance (T=10-50%) dielectric film;
optionally, the fiber single-frequency seed laser module adopts a fiber DFB (distributed feedback) laser to emit 2 μm single-frequency laser with a linewidth smaller than 30kHz, and adopts a fiber beam splitter to realize two paths of output, one path is used for beat frequency detection, and the other path is injected into the laser;
the frequency shifter adopts homologous double-path acousto-optic frequency shifting, the material adopts fused quartz crystals, two sides of the frequency shifter are plated with 2 mu m wave band antireflection films, and the frequency shifting amount is 40-120 MHz;
the isolator adopts a magneto-optical crystal with a certain deflection angle to isolate the damage of the return light of the laser to the single-frequency seed laser;
the 45-degree reflector II is used for reflecting seed light and injecting the seed light into the laser resonant cavity through the 45-degree partial transmittance mirror;
the compensating lens, the optical wedge, the external reflection right angle prism, the 0-degree reflecting mirror, the 45-degree partial transmittance mirror and the right angle reflecting prism are made of one of JGS1 glass, JGS3 glass, 7979 glass and 7980 glass;
the piezoelectric ceramic actuator is a cylindrical piezoelectric ceramic actuator and an annular piezoelectric ceramic actuator, the piezoelectric ceramic actuator is connected with the 45-degree reflecting mirror, and the piezoelectric ceramic actuator is connected with an external reflection rectangular prism to stretch and contract when the piezoelectric ceramic actuator is electrified, so that injected seed light generates an interference signal in the laser;
the photoelectric detector adopts an enhanced InGaAs photoelectric detector or a PbS detector, and is positioned behind the 45-degree mirror to detect the injected seed optical resonance signal.
The utility model has the following advantages:
(1) In the technical scheme, a laser side pump module is used as an energy source for generating 2 mu m laser, and a 45-degree mirror reflector component I and a 0-degree reflector form a 2 mu m wave band ring laser together; the external reflection triangular prism and the 0-degree plane reflecting mirror are combined together to effectively compress the laser cavity length, so that the plane size of the laser can be reduced by more than 30% under the condition that the laser cavity length is unchanged, and the laser has good self-adaptive capacity to external vibration interference;
(2) In the technical scheme, the single-frequency seed laser has two paths of laser outputs, one path is used for beat frequency detection, the other path is injected into a laser resonant cavity through a partial transmittance mirror surface of a 45-degree partial transmittance mirror, one surface of a third 45-degree reflecting mirror I is plated with a 2 mu m wave band antireflection film, the other surface of the third 45-degree reflecting mirror I is plated with a medium film with transmittance of 10% -50%, a piezoelectric ceramic actuator is connected with a first 45-degree reflecting mirror I to enable the single-frequency seed laser to generate periodic interference through expansion and contraction, a photoelectric detector is positioned behind a second 45-degree reflecting mirror I to detect a periodic interference signal of the seed laser, and whether an acousto-optic Q-switching element opens a door is controlled according to the detected interference peak:
(3) The utility model solves the defects of overlarge volume and low integration level of the existing high-energy single-frequency 2 mu m laser, meets the space application condition, can realize high-integration design and can realize stable operation of laser with pulse width of more than 200ns, energy of more than 200mJ and line width of less than 5 MHz.
Drawings
FIG. 1 is a schematic diagram of a single frequency high energy 2 μm laser for coherent detection;
FIG. 2 is a schematic diagram of a single frequency high energy 2 μm laser triangular prism for coherent detection.
Reference numerals:
1. a laser side pump module; 2. a polarizing element; 3. a 45 ° mirror assembly I; 31. a first 45 ° mirror I; 32. a second 45 DEG mirror I; 33. a third 45 ° mirror I; 33. a fourth 45 ° mirror I; 4. a compensation lens assembly; 41. a first compensation lens; 42. a second compensation lens; 5. an optical wedge assembly; 5-1, a first optical wedge; 5-2, a second optical wedge; 6. an external reflection triangular prism; 7. a 0 ° mirror; 8. an acousto-optic Q-switching element; 9. 45 DEG mirror assembly II; 9-1, a first 45 DEG reflecting mirror II; 9-2, a second 45-degree reflecting mirror II; 10. a single frequency seed laser module; 11. a frequency shifter; 12. an isolator; 13. a piezoelectric ceramic actuator; 14. a photodetector.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Example 1
As shown in fig. 1-2, a single-frequency high-energy 2 μm laser for coherent detection is applied to a coherent detection laser radar, and the single-frequency high-energy 2 μm laser for coherent detection specifically comprises the following components: a laser side pump module 1, a polarizing element 2, a 45-degree reflecting mirror assembly I3 (including 3-1, 3-2, 3-3 and 3-4), a compensating lens assembly 4 (4-1 and 4-2), an optical wedge assembly 5 (5-1 and 5-2), an external reflecting triangular prism 6, a 0-degree reflecting mirror 7, an acousto-optic Q-switching element 8, a 45-degree reflecting mirror assembly II 9 (including 9-1 and 9-2), a single-frequency seed laser module 10, a frequency shifter 11, an isolator 12, a piezoelectric ceramic actuator 13 and a photodetector 14;
the laser crystal of the laser side pump module 1 adopts a-cut Tm, ho, YLF crystal, the pumping wavelength of the laser diode adopts 792nm, and the laser side pump module 1 is used as an energy source for generating 2 mu m laser;
the polarizing element 2 adopts a 45-degree polarizing flat beam splitter and is made of N-SF1 glass so as to improve the polarization ratio of the laser;
the side surface of the 45-degree reflecting mirror component I3 is polished and plated with a 45+/-3-degree 2-mu m wave band high-reflection film;
one side of the third 45-degree reflecting mirror component I3-3 is plated with a 2-2.1 mu m wave band antireflection film, the other side is plated with a 2-2.1 mu m wave band transmittance 30% dielectric film, the 45-degree partial transmittance mirror 9 is used as a coupling output mirror, one side injects seed light into a laser resonant cavity through reflection, and the other side emits 2 mu m laser generated by a laser;
the compensating lens 4 is a plano-convex lens with a focal length of 1500mm, and two sides of the compensating lens are plated with 2-2.1 mu m wave band antireflection films for compensating laser modes in the resonant cavity and changing the distribution of the modes in the cavity;
the optical wedge 5 is a 2-degree flat inclined mirror, two sides of the optical wedge are plated with 2-2.1 mu m wave band antireflection films, and angle errors caused by structural machining errors of the adjusting lasers are symmetrically placed in the lasers;
the external reflection right angle prism 6, the inclined planes S2 and S3 are plated with 2-2.1 mu m wave band high reflection films, the laser is reflected at the inclined planes, and the obtuse angle is 92 degrees;
the 0 degree reflecting mirror 7 is plated with a 0+ -10 degree 2 μm high reflection film;
under the condition that the external reflection right-angle prism 6 and the 0-degree reflecting mirror 7 are combined together to ensure that the cavity length of the laser is unchanged, the plane size of the laser is reduced by more than 30 percent;
the 45-degree reflecting mirror component I3, the compensating lens 4, the external reflecting rectangular prism 6 and the 0-degree reflecting mirror 7 form a laser resonant cavity together;
the acousto-optic Q-switching element 8 adopts fused quartz crystal, and two sides are plated with 2-2.1 mu m wave band antireflection films;
the 45-degree reflecting mirror component II 9 is used for reflecting seed light and injecting the seed light into the laser resonant cavity through the third 45-degree reflecting mirror component I3-3;
the single-frequency seed laser 10 adopts a holmium fiber laser, emits 2 mu m single-frequency laser with a line width of 10kHz, and has two paths of laser outputs, wherein one path is used for beat frequency detection, and the other path is injected into a laser resonant cavity through a third 45-degree reflecting mirror component I3-3;
the frequency shifter 11 adopts homologous double-path acousto-optic frequency shifting, the material adopts fused quartz crystal, two sides are plated with 2-2.1 mu m wave band antireflection films, and the frequency shifting amount is 105MHz;
the isolator 12 adopts a 45-degree magneto-optical crystal to isolate the damage of the laser return light to the single-frequency seed laser;
the 45-degree reflecting mirror component I3, the compensating lens 4, the optical wedge 5, the external reflecting rectangular prism 6, the 0-degree reflecting mirror 7 and the 45-degree reflecting mirror component II 9 are made of 7979 glass;
the piezoelectric ceramic actuator 13 is a cylindrical piezoelectric ceramic actuator, the piezoelectric ceramic actuator 13 is connected with the first 45-degree reflecting mirror I3-1, and the piezoelectric ceramic actuator 13 stretches and contracts with the first 45-degree reflecting mirror I3-1 when the piezoelectric ceramic actuator is electrified, so that the injected seed light generates a periodic interference signal in the laser;
the photoelectric detector 14 adopts an enhanced InGaAs photoelectric detector, detects an injected seed light interference signal after being positioned on the second 45-degree reflecting mirror I3-2, and controls whether the acousto-optic Q-switching element 8 opens the door according to the detected interference peak.
In this embodiment 1, the laser side pump module 1 is an energy source for generating 2 μm laser, and the 45 ° mirror assembly I3 and the 0 ° mirror 7 together form a 2 μm band ring laser; the external reflection triangular prism 6 and the 0-degree plane reflector 7 are combined together to effectively compress the cavity length of the laser; the compensating lens 4 compensates the laser mode in the resonant cavity and changes the mode distribution in the cavity; the single-frequency seed laser 10 has two paths of laser outputs, one path is used for beat frequency detection, the other path is injected into a laser resonant cavity through one surface of a third 45-degree reflecting mirror I3-3, which is plated with a dielectric film with the transmittance of 10% -50%, and 2 mu m laser generated by the laser is emitted through one surface of the third 45-degree reflecting mirror I3-3, which is plated with a 2 mu m wave band antireflection film; the piezoelectric ceramic actuator 13 is connected with the first 45-degree reflecting mirror I3-1, single-frequency seed laser generates periodic interference through expansion and contraction, the photoelectric detector 14 is positioned behind the second 45-degree reflecting mirror I3-2 and detects a periodic interference signal of the seed laser, and whether the acousto-optic Q-switching element 8 opens the door is controlled according to the detected interference peak.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (10)
1. A single frequency high energy 2 μm laser for coherent detection, characterized by: the device comprises a laser side pump module (1), a polarization beam splitter (2), a 45-degree reflecting mirror component I (3), a compensating lens component (4), an optical wedge component (5), an external reflection triangular prism (6) and a 0-degree reflecting mirror (7);
the 45-degree reflecting mirror assembly I (3) comprises a first 45-degree reflecting mirror I (3-1), a second 45-degree reflecting mirror I (3-2), a third 45-degree reflecting mirror I (3-3) and a fourth 45-degree reflecting mirror I (3-4), the compensating lens assembly (4) comprises a first compensating lens (4-1) and a second compensating lens (4-2), and the optical wedge assembly (5) comprises a first optical wedge (5-1) and a second optical wedge (5-2);
the external reflection triangular prism (6) comprises a bottom surface S1, a first side surface S2 and a second side surface S3 which are intersected with the included angle of the bottom surface S1 respectively, wherein the first side surface S2 and the second side surface S3 are intersected at the top;
the polarization beam splitter (2) and the first 45-degree reflecting mirror I (3-1) are sequentially arranged on an output light path at one side of the laser side pump module (1), and the first 45-degree reflecting mirror I (3-1) turns the light path by 45 degrees; the first compensation lens (4-1), the first optical wedge (5-1) and the second 45-degree reflecting mirror I (3-2) are sequentially arranged on an output light path of the first 45-degree reflecting mirror I (3-1), and the second 45-degree reflecting mirror I (3-2) turns the light path by 45 degrees; the third 45-degree reflecting mirror I (3-3) is arranged on the output light path of the second 45-degree reflecting mirror I (3-2);
the fourth 45-degree reflecting mirror I (3-4) is arranged on the output light path at the other side of the laser side pump module (1), and the fourth 45-degree reflecting mirror I (3-4) turns the light path by 45 degrees; the second compensation lens (4-2), the second optical wedge (5-2) and the external reflection triangular prism (6) are sequentially arranged on the output light path of the fourth 45-degree reflecting mirror I (3-4), the first side surface S2 faces the output light path of the second optical wedge (5-2), and the second side surface S3 faces the input light path of the third 45-degree reflecting mirror I (3-3);
the 0-degree reflecting mirror (7) is arranged on the output light path of the external reflection triangular prism (6);
the first side S2 reflects the output light of the second optical wedge (5-2) to the 0-degree reflecting mirror (7), the 0-degree reflecting mirror (7) reflects the output light to the second side S3, and the second side S3 turns a light path and reflects the output light to the third 45-degree reflecting mirror I (3-3) for outputting.
2. A single frequency high energy 2 μm laser for coherent detection according to claim 1, characterized in that: the single-frequency seed laser module (10) is sequentially arranged on a frequency shifter (11), an isolator (12) and a 45-degree reflecting mirror assembly II (9) on an output light path of the single-frequency seed laser module (10), the 45-degree reflecting mirror assembly II (9) comprises a first 45-degree reflecting mirror II (9-1) and a second 45-degree reflecting mirror II (9-2) which are sequentially arranged, the first 45-degree reflecting mirror II (9-1) outputs output light of the isolator (12) to the second 45-degree reflecting mirror II (9-2) in a 45-degree light path turning mode, and the second 45-degree reflecting mirror II (9-2) outputs the output light of the isolator to the third 45-degree reflecting mirror I (3-3) in a 45-degree light path turning mode;
one side of the third 45-degree reflecting mirror I (3-3) facing the external reflecting triangular prism (6) and the second 45-degree reflecting mirror I (3-2) is plated with a 2-mu m wave band antireflection film, the other side of the third 45-degree reflecting mirror I is plated with a dielectric film with 10% -50% of transmittance, and the third 45-degree reflecting mirror I (3-3) transmits the output light part of the second 45-degree reflecting mirror II (9-2) to the second 45-degree reflecting mirror I (3-2).
3. A single frequency high energy 2 μm laser for coherent detection according to claim 1, characterized in that: the top included angle between the first side surface S2 and the second side surface S3 is 92-100 degrees.
4. A single frequency high energy 2 μm laser for coherent detection according to any one of claims 1-3, characterized in that: the device also comprises an acousto-optic Q-switching element (8) arranged on the optical path between the second 45-degree reflecting mirror I (3-2) and the third 45-degree reflecting mirror I (3-3), a piezoelectric ceramic actuator (13) connected with the rear side of the first 45-degree reflecting mirror I (3-1) and a photoelectric detector (14) arranged on one side of the second 45-degree reflecting mirror I (3-2).
5. A method according to claim 1 forThe single-frequency high-energy 2 mu m laser for coherent detection is characterized in that: the laser crystal of the laser side pump module (1) is any one of the following: tm, ho: YLF crystal, tm, ho: YAG crystal, tm, ho: YAP crystal, tm: YLF crystal, tm: YAG crystal, tm: YAP crystal and Tm: Y 2 O 3 A crystal;
the pumping wavelength of the laser diode of the laser side pump module (1) is 780 nm-800 nm.
6. A single frequency high energy 2 μm laser for coherent detection according to claim 1, characterized in that: the polarization beam splitter (2) is any one of the following: 45-degree polarizing plate beam splitter, brewster angle polarizing plate beam splitter and polarizing beam splitter cube, wherein the polarizing beam splitter (2) is made of any one of the following materials: ultraviolet fused silica, N-SF1 glass, and H-LaK67 glass.
7. A single frequency high energy 2 μm laser for coherent detection according to claim 1, characterized in that: the side surfaces of the first 45-degree reflecting mirror I (3-1), the second 45-degree reflecting mirror I (3-2) and the fourth 45-degree reflecting mirror I (3-4) are polished and plated with a 45+/-3-degree 2-mu m-band high-reflection film and a 792-nm anti-reflection film;
the first compensation lens (4-1) and the second compensation lens (4-2) are both curved lenses, and two surfaces of the first compensation lens and the second compensation lens are plated with 2 mu m wave band antireflection films;
the angles of the first optical wedge (5-1) and the second optical wedge (5-2) are 0.5-5 DEG, and two sides of the first optical wedge and the second optical wedge are plated with 2 mu m wave band antireflection films;
the first side S2 and the second side S3 are plated with 2 mu m-band high-reflection films;
the 0-degree reflecting mirror (7) is plated with a 0+ -10-degree 2 μm high-reflection film.
8. A single frequency high energy 2 μm laser for coherent detection according to claim 2, characterized in that: the 45-degree reflecting mirror assembly I (3), the compensating lens assembly (4), the optical wedge assembly (5), the external reflecting triangular prism (6), the 0-degree reflecting mirror (7) and the 45-degree reflecting mirror assembly II (9) are made of any one of the following materials: JGS1 glass, JGS3 glass, 7979 glass, and 7980 glass.
9. A single frequency high energy 2 μm laser for coherent detection according to claim 2, characterized in that:
the 45-degree reflecting mirror assembly II (9) reflects seed light;
the single-frequency seed laser module (10) is an optical fiber DFB laser which emits 2 mu m single-frequency laser and has a linewidth smaller than 30kHz, the single-frequency seed laser module (10) outputs two paths through an optical fiber beam splitter, one path is used for beat frequency detection, and the other path is injected into the laser;
the frequency shifter (11) uses homologous two-way acousto-optic frequency shifting, the frequency shifter (11) is made of fused quartz crystal, two sides of the frequency shifter are plated with 2 mu m wave band antireflection films, and the frequency shifting amount is 40-120 MHz;
the isolator (12) is a magneto-optical crystal having a deflection angle.
10. A single frequency high energy 2 μm laser for coherent detection according to claim 4, characterized in that: the acousto-optic Q-switching element (8) uses fused quartz crystals, and two sides of the element are plated with 2 mu m wave band antireflection films;
the piezoelectric ceramic actuator (13) is a cylindrical piezoelectric ceramic actuator and an annular piezoelectric ceramic actuator;
the photodetector (14) uses an enhanced InGaAs photodetector or PbS detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322066188.7U CN220527389U (en) | 2023-08-02 | 2023-08-02 | Single-frequency high-energy 2 mu m laser for coherent detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322066188.7U CN220527389U (en) | 2023-08-02 | 2023-08-02 | Single-frequency high-energy 2 mu m laser for coherent detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220527389U true CN220527389U (en) | 2024-02-23 |
Family
ID=89935288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322066188.7U Active CN220527389U (en) | 2023-08-02 | 2023-08-02 | Single-frequency high-energy 2 mu m laser for coherent detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220527389U (en) |
-
2023
- 2023-08-02 CN CN202322066188.7U patent/CN220527389U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8130800B2 (en) | Mode-locked solid state lasers using diode laser excitation | |
| US5148444A (en) | Tunable single-frequency ring laser | |
| CN110943366B (en) | Dual-wavelength alternating Q-switching output group pulse laser and laser output method | |
| CN108155550B (en) | Ring oscillator capable of obtaining high repetition frequency injection locking single-frequency pulse | |
| CN105119139B (en) | Based on 2 μm of solid state lasers of suspension resonant cavity tunable single longitudinal mode | |
| CN101483317A (en) | Pump mode for semiconductor laser | |
| CN114696184B (en) | Feedback enhancement method of self-injection locking laser based on echo wall external cavity | |
| CN112636143B (en) | Anti-detuning type multi-time folding resonant cavity laser | |
| CN220527389U (en) | Single-frequency high-energy 2 mu m laser for coherent detection | |
| US7457328B2 (en) | Polarization methods for diode laser excitation of solid state lasers | |
| CN112290359A (en) | Double-resonant-cavity Raman laser | |
| CN102035136B (en) | External cavity semiconductor laser | |
| US7068700B2 (en) | Optical bench for diode-pumped solid state lasers in field applications | |
| CN215343344U (en) | Edge-emitting laser | |
| CN115799965A (en) | Injection locking type blue laser system | |
| WO1999035722A1 (en) | Solid laser not requiring alignment | |
| CN113241578A (en) | Phase bias nonlinear polarization rotation mode locking fiber laser and implementation method | |
| CN102263364A (en) | Transverse plane pump laser capable of high efficiently using pump light | |
| CN117543317A (en) | High vibration-resistant high-energy annular single-frequency laser | |
| CN112652941A (en) | High-energy, high-stability and high-reliability slab laser | |
| CN114731024A (en) | Non-reciprocal optical assembly for injection-locked laser | |
| CN113161856B (en) | 1.6 mu m injection locking solid laser based on bipyramid resonant cavity and generation method | |
| CN214411754U (en) | Self-feedback-regulated high-stability ultraviolet pulse laser | |
| CN217087125U (en) | Narrow pulse width laser with high repetition frequency and high beam quality | |
| Cella et al. | Coatingless, tunable finesse interferometer for gravitational wave detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |