CN109459415B - Laser transient grating system with continuously adjustable space period - Google Patents
Laser transient grating system with continuously adjustable space period Download PDFInfo
- Publication number
- CN109459415B CN109459415B CN201811457616.6A CN201811457616A CN109459415B CN 109459415 B CN109459415 B CN 109459415B CN 201811457616 A CN201811457616 A CN 201811457616A CN 109459415 B CN109459415 B CN 109459415B
- Authority
- CN
- China
- Prior art keywords
- grating
- laser beam
- detection
- excitation
- light
- 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
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4788—Diffraction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Microscoopes, Condenser (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a laser transient grating system with continuously adjustable spatial period, which comprises an excitation laser beam, a mask grating, a filtering device and a continuous zooming imaging device. By using the laser transient grating system with continuously adjustable spatial period, the continuous change of the imaging multiplying power of the system can be realized by adjusting the distance between all the first lenses under the condition of keeping the sample position still, namely, the laser transient grating with continuously adjustable spatial period is realized on the sample, and the requirement of carrying out fine continuous fine adjustment control on the period of the transient grating in some application fields is met.
Description
Technical Field
The invention relates to the field of laser pumping detection, in particular to a laser transient grating system with a continuously adjustable spatial period.
Background
The transient grating technology generated by laser excitation is a time resolution technology, two mutually crossed laser pulses generate interference in a sample to form a space periodic excitation, and the dynamic change of the space periodic excitation can be observed through the diffraction of the space periodic excitation on detection light; transient grating spectroscopy has been applied to a wide range of fields, such as the research fields of acoustic wave propagation, phonon polarization, heat transfer, molecular diffusion, semiconductor carrier and spin dynamics, charge density waves, and the kinetic behavior of proteins.
At present, most transient grating devices generate a pair of excitation laser beams by utilizing first-order diffraction with higher diffraction efficiency of a grating, and stable optical heterodyne detection can be realized by utilizing the diffraction grating; the most commonly used heterodyne transient grating divides excitation light into excitation laser beam pairs through a phase mask grating, divides detection light into detection laser beams and reference beams, the beams are superposed again in a sample after passing through a 4f system, diffraction light generated by the transient grating excited by pump laser in the sample and the reference beams transmitted from the sample are coaxial and collinear, so that heterodyne detection is realized, and the phase difference between the detection light and the reference light can be controlled by adjusting the inclination angle of a glass sheet placed in a detection light path.
Although transient gratings of different frequencies can be excited by replacing mask gratings of different frequencies, in some applications fine control of the period of the transient grating is required, for example in acoustic measurements where it is desirable to be able to perform continuous accurate mode selection excitation at the boundary of the brillouin zone of a phononic crystal or to seek narrow resonances of acoustic metamaterials.
Disclosure of Invention
The invention aims to overcome the defects that the conventional laser transient grating system in the prior art can excite a transient grating with different frequencies by replacing a mask grating with different frequencies, but cannot meet the requirement of finely controlling the period of the transient grating in some application fields, and provides a laser transient grating system with continuously adjustable spatial period.
In order to achieve the above purpose, the invention provides the following technical scheme:
a laser transient grating system with a continuously adjustable spatial period, comprising:
an excitation laser beam for exciting the transient grating;
the mask grating is used for carrying out diffraction light splitting on the excitation laser beam, and the excitation laser beam is irradiated on the mask grating from one side of the mask grating;
the filtering device and the excitation laser beams are respectively positioned at two opposite sides of the mask grating, the filtering device comprises a plurality of absorption baffles, and the absorption baffles are used for absorbing zero-order diffraction light and high-order diffraction light which shield the excitation laser beams, leaving +/-1-order diffraction light of the excitation laser beams and forming excitation beam pairs;
the continuous zooming imaging device and the mask grating are respectively positioned on two opposite sides of the filtering device, the continuous zooming imaging device comprises at least three first lenses which are sequentially arranged, the distance between every two adjacent first lenses is adjustable, the excitation light beam is oppositely emitted into the continuous zooming imaging device and is refracted by all the first lenses to be emitted, and finally the light beams are converged and cross-interfered on a sample to form a transient grating.
Wherein the first lens comprises a convex lens, a concave lens, a plano-convex lens and a plano-concave lens, and the continuous zooming imaging device comprises two basic combination structures of convex-concave-convex or concave-convex-concave, and a combination structure which is deformed and expanded on the two basic combination structures of convex-concave-convex or concave-convex-concave, such as convex-concave-convex, concave-convex-concave, and the like.
By adopting the laser transient grating system with continuously adjustable spatial period, the continuous change of the imaging multiplying power of the system can be realized by adjusting the distance between all the first lenses under the condition of keeping the sample position still, namely, the laser transient grating with continuously adjustable spatial period is realized on the sample, and the requirement of carrying out fine continuous fine adjustment control on the period of the transient grating in some application fields is met.
Preferably, the mask grating is a variable-frequency mask grating for generating diffracted lights at different angles.
By adopting the structural arrangement, the variable-frequency mask grating comprises a plurality of gratings with different frequencies, the excitation laser beam irradiates on the same grating every time, and the position of the mask grating is moved to enable the excitation laser beam to irradiate on the gratings with different frequencies, so that the diffraction splitting angle is controlled, and the transient grating is adjusted.
Preferably, the transient grating system further comprises a 4f device, the 4f device is located between the mask grating and the continuous zoom imaging device, the 4f device comprises two second lenses which are oppositely arranged, the filter device is located between the two second lenses, and the 4f device is used for receiving and refracting the ± 1 st order diffracted light of the excitation laser beam.
The 4f device referred to herein is a 4f system commonly used in the optical field.
By adopting the structure, through confocal imaging of the 4f device, the light beams after being diffracted and dispersed by the mask grating are superposed at the imaging position to form an image of the mask grating, and the continuous fine adjustment of the transient grating period is realized through an image transmission mode.
Preferably, the transient grating system further includes a detection laser beam and a detection device, the detection laser beam and the excitation laser beam are located on the same side of the mask grating and act on the same position of the mask grating, the detection device and the continuous zoom imaging device are located on two opposite sides of the sample, the detection laser beam is diffracted by the transient grating, and the detection device is configured to receive diffracted light of the detection laser beam.
The mask grating performs diffraction light splitting on the detection laser beam, the absorption baffle absorbs redundant diffraction light of the detection laser beam, the required detection laser beam diffraction light is reserved and enters the continuous zooming imaging device, and finally the detection laser beam diffraction light is transmitted to the transient grating.
Preferably, the excitation laser beam is coaxial with the detection laser beam in the initial state.
Preferably, the transient grating system further comprises an excitation light source and a detection light source, wherein the excitation light source is used for emitting the excitation laser beam, and the detection light source is used for emitting the detection laser beam.
Preferably, the excitation laser beam is a short pulse laser or an ultrashort pulse laser, and the detection laser beam is a narrow-linewidth continuous laser or a synchronous long pulse laser.
Preferably, the detection laser beam comprises a detection beam and a reference beam.
The mask grating is used for carrying out diffraction light splitting on the detection laser beam, the absorption baffle plate is used for absorbing zero-order diffraction light and high-order diffraction light which shield the detection laser beam, and +/-1-order diffraction light of the detection laser beam is reserved, the +/-1-order diffraction light of the detection laser beam is the detection light beam and the reference light beam, the detection light beam and the reference light beam enter the continuous zooming imaging device and are finally transmitted to the transient grating, the diffraction light generated by the transient grating in the sample of the detection light beam and the reference light beam transmitted from the sample are coaxial and collinear, and heterodyne detection is realized.
Preferably, the transient grating system further includes an attenuation sheet, the attenuation sheet is located between the mask grating and the continuous zoom imaging device and located on the light path of the reference beam, and the attenuation sheet is used for adjusting the intensity of the reference beam to facilitate heterodyne detection.
Preferably, the attenuation sheet is a neutral attenuation sheet.
Preferably, the transient grating system further comprises a glass sheet, the glass sheet is located between the mask grating and the continuous zoom imaging device, the glass sheet and the attenuation sheet are equal in thickness, the glass sheet is located on the optical path of the detection beam, and the glass sheet is used for enabling the optical paths of the detection beam and the reference beam to be equal.
The phase difference of both the probe beam and the reference beam can be controlled by adjusting the tilt angle of the glass sheet.
Preferably, the continuous zoom imaging device further includes a housing, all the first lenses are disposed in the housing, the housing includes a light inlet and a light outlet which are disposed oppositely, the excitation light beam pair is incident from the light inlet, transmitted through all the first lenses, and emitted from the light outlet, and is converged and cross-interfered on the sample to form a transient grating.
Preferably, the first lens close to one side of the mask grating is fixedly arranged relative to the housing, and the imaging magnification of the continuous zooming imaging device is adjusted by only changing the position relation of the rest of the first lenses, so that the structural design of the continuous zooming imaging device is simplified, and the use is convenient.
Preferably, the continuous zooming imaging device further comprises a guide rail, the guide rail is arranged in the shell, all the first lenses are slidably arranged on the guide rail, a plurality of adjusting parts are arranged on the outer surface of the shell, a plurality of transmission parts are arranged in the shell, each transmission part is correspondingly connected with one first lens, and each adjusting part is used for adjusting at least one linkage of the transmission parts, so that at least one linkage of the first lenses is adjusted, and the continuous zooming imaging device is continuously changed in imaging magnification.
Preferably, the adjusting part is a knob, an indication strip is arranged on the knob, and an imaging magnification calibration value is arranged on the outer surface of the shell corresponding to the knob.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. by using the laser transient grating system with continuously adjustable spatial period, the continuous change of the imaging multiplying power of the system can be realized by adjusting the distance between all the first lenses under the condition of keeping the sample position still, namely, the laser transient grating with continuously adjustable spatial period is realized on the sample, and the requirement of carrying out fine continuous fine adjustment control on the period of the transient grating in some application fields is met, so that the system has the advantages of simple structure, convenience in use and good effect;
2. by applying the laser transient grating system with continuously adjustable spatial period, which is disclosed by the invention, the variable-frequency mask grating comprises a plurality of gratings with different frequencies, the excitation laser beam irradiates on the same grating each time, and the position of the mask grating is moved to enable the excitation laser beam to irradiate on the gratings with different frequencies, so that the diffraction beam splitting angle is controlled, and the transient grating is adjusted;
3. by applying the laser transient grating system with continuously adjustable spatial period, the light beams after being diffracted and dispersed by the mask grating are coincided at the imaging position through the confocal imaging of the 4f device to form the image of the mask grating, and the continuous fine adjustment of the transient grating period is realized through the image transmission mode;
4. by using the laser transient grating system with continuously adjustable spatial period, the detection beam passes through diffraction light generated by the transient grating in the sample and is coaxial and collinear with the reference beam transmitted from the sample, so that heterodyne detection is realized;
5. by using the laser transient grating system with continuously adjustable spatial period, the attenuation sheet is used for adjusting the intensity of the reference beam so as to be beneficial to heterodyne detection;
6. by using the laser transient grating system with the continuously adjustable spatial period, the thickness of the glass sheet is equal to that of the attenuation sheet, the optical paths of the detection beam and the reference beam are equal through the glass sheet, and the phase difference between the detection beam and the reference beam can be controlled by adjusting the inclination angle of the glass sheet.
Drawings
Fig. 1 is a schematic structural diagram of a laser transient grating system with a continuously adjustable spatial period according to the present invention.
The labels in the figure are: 1-excitation laser beam, 2-detection laser beam, 21-detection beam, 22-reference beam, 3-mask grating, 4-4f device, 41-glass sheet, 42-attenuation sheet, 43-absorption baffle, 44-second lens, 5-continuous zooming imaging device, 51-first lens, 52-shell, 6-detection device and 7-sample.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Examples
As shown in fig. 1, the laser transient grating system with continuously adjustable spatial period according to the present invention includes:
the excitation light source is used for emitting an excitation laser beam 1, the excitation laser beam 1 is used for exciting the transient grating, and the excitation laser beam 1 is short pulse laser or ultrashort pulse laser;
the detection light source is used for emitting a detection laser beam 2, the detection laser beam 2 and the excitation laser beam 1 are positioned on the same side of the mask grating 3 and act on the same position of the mask grating 3, and the detection laser beam 2 is a narrow-linewidth continuous laser;
the mask grating 3 is used for diffracting and splitting the excitation laser beam 1 and the detection laser beam 2, the excitation laser beam 1 and the detection laser beam 2 are irradiated onto the mask grating 3 from one side of the mask grating 3, the mask grating 3 is a variable-frequency mask grating, the variable-frequency mask grating comprises a plurality of gratings with different frequencies, the excitation laser beam 1 and the detection laser beam 2 are irradiated onto the same grating each time, and the positions of the mask grating 3 are moved to enable the excitation laser beam 1 and the detection laser beam 2 to be irradiated onto the gratings with different frequencies, so that the diffraction splitting angle is controlled, and the transient grating is adjusted;
the 4f device 4 and the excitation laser beam 1 are respectively positioned at two opposite sides of the mask grating 3, the 4f device 4 comprises two second lenses 44 which are oppositely arranged, the mask grating 3 is positioned at the front focal point position of the second lens 44 which is close to the mask grating, and a filter device, a glass plate 41 and an attenuation plate 42 are arranged between the two second lenses 44; the optical filtering device comprises a plurality of absorbing baffles 43, all the absorbing baffles 43 are positioned at the back focal plane position of the second lens 44 close to the mask grating 3 (and at the same time, at the front focal plane position of the second lens 44 far away from the mask grating 3), the absorbing baffles 43 are used for absorbing the zero-order diffraction light and the high-order diffraction light which block the excitation laser beam 1, and absorbing the zero-order diffraction light and the high-order diffraction light which block the detection laser beam 2, leaving the plus or minus 1-order diffraction light of the excitation laser beam 1 to form an excitation beam pair, leaving the plus or minus 1-order diffraction light of the detection laser beam 2, and dividing the plus or minus 1-order diffraction light of the detection laser beam 2 into a detection beam 21 and a reference beam 22; the attenuation sheet 42 is a neutral attenuation sheet and is located on the light path of the reference beam 22, the attenuation sheet 42 is used for adjusting the intensity of the reference beam 22 to facilitate heterodyne detection, the glass sheet 41 and the attenuation sheet 42 are equal in thickness and located on the light path of the detection beam 21, and the glass sheet 41 is used for enabling the light paths of the detection beam 21 and the reference beam 22 to be equal; the 4f device 4 is used for receiving and transmitting the diffracted light of the excitation laser beam 1 and converging the excitation beam pair, the probe beam 21 and the reference beam 22;
the continuous zooming imaging device 5 and the mask grating 3 are respectively positioned at two opposite sides of the 4f device 4, and the continuous zooming imaging device 5 comprises a shell 52 and three first lenses 51 arranged in sequence; the housing 52 comprises a light inlet and a light outlet which are oppositely arranged, a guide rail and a plurality of transmission components are arranged in the housing 52, all the first lenses 51 are connected to the guide rail in a sliding manner, and each transmission component is correspondingly connected with one first lens 51; a plurality of knobs are arranged on the outer surface of the shell 52, indicator strips are arranged on the knobs, imaging magnification calibration values are arranged on the outer surface of the shell 52 at positions corresponding to the knobs, and each knob is used for adjusting linkage of at least one transmission part so as to adjust linkage of at least one first lens 51 and realize continuous change of imaging magnification of the continuous zooming imaging device 5; the first lens 51 comprises a convex lens and a concave lens; the excitation light beam pair is emitted from the light inlet, refracted by all the first lenses 51, emitted from the light outlet, and converged and cross-interfered on the sample 7 to form a transient grating; wherein the front diaphragm of the continuous zoom imaging device 5 is kept at a fixed distance from the back focal plane of the second lens 44 close to the continuous zoom imaging device 5;
the detection device 6, the detection device 6 and the continuous zoom imaging device 5 are located on two opposite sides of the sample 7, diffracted light generated by the transient grating in the sample 7 through the probe beam 21 is coaxial and collinear with the reference beam 22 transmitted from the sample 7, and the detection device 6 is used for receiving the diffracted light of the probe beam 21 and the reference beam 22 to realize heterodyne detection; wherein the detecting device 6 comprises at least one third lens, the sample 7 is kept at a fixed distance from the rear diaphragm of the continuous zoom imaging device 5, and the front focus of the third lens close to the sample 7 is located at the sample 7.
In use, the excitation light source emits the excitation laser beam 1, the detection light source emits the detection laser beam 2, the detection laser beam 2 and the excitation laser beam 1 act on the same position of the mask grating 3, the mask grating 3 diffracts and splits the excitation laser beam 1 and the detection laser beam 2, the plus or minus 1 st order diffracted light of the excitation laser beam 1 is taken as the excitation beam, the plus or minus 1 st order diffracted light of the detection laser beam 2 is taken as the detection beam 21 and the reference beam 22, the rest diffracted light is absorbed by the absorption baffle 43 in the 4f device 4, the reference beam 22 passes through the attenuation sheet 42 in the 4f device 4, the detection beam 21 passes through the glass sheet 41 in the 4f device 4, and the excitation beam, the detection beam 21 and the reference beam 22 are transmitted and converged through the 4f device 4 to form the mask grating 3 And the excitation beam, the probe beam 21 and the reference beam 22 enter the continuous zoom imaging device 5 and finally converge on the sample 7, the excitation beam forms a transient grating on the sample 7, the probe beam 21 is diffracted on the transient grating, the diffracted light of the probe beam 21 is coaxially collinear with the transmitted light of the reference beam 22 on the transient grating and is detected by the detection device 6, the reference beam 22 strengthens the signal intensity of the diffracted light of the probe beam 21, and the excitation beam, the probe beam 21 and the reference beam 22 are adjusted by the continuous zoom imaging device 5 to realize the continuous change of the imaging magnification of the system under the condition that the sample 7 is kept still.
As a preferable solution of this embodiment, the excitation laser beam 1 is coaxial with the detection laser beam 2 in an initial state; the phase difference of both the probe beam 21 and the reference beam 22 can be controlled by adjusting the tilt angle of the glass sheet 41; the first lens 51 close to one side of the mask grating 3 is fixedly arranged relative to the housing 52, and the imaging magnification of the continuous zooming imaging device 5 is adjusted by only changing the position relation of the rest of the first lenses 51, so that the structural design of the continuous zooming imaging device 5 is simplified, and the use is convenient.
By using the laser transient grating system with continuously adjustable spatial period, the position of the sample 7 can be kept still, the confocal imaging of the 4f device 4 is utilized, the light beams after the diffraction and the light splitting of the mask grating 3 are superposed at the imaging position to form the image of the mask grating 3, and the image of the mask grating 3 is transmitted through the continuous zooming imaging device 5, wherein the distance between all the first lenses 51 is adjusted to realize the continuous change of the imaging multiplying power of the system, namely the laser transient grating with continuously adjustable spatial period is realized on the sample 7, so that the requirement of carrying out fine continuous fine adjustment control on the period of the transient grating in some application fields is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A laser transient grating system with continuously adjustable spatial period is applied to acoustic measurement, and comprises: an excitation laser beam (1) for exciting the transient grating; a mask grating (3) for diffracting and splitting the excitation laser beam (1); the detection laser beam (2) and the excitation laser beam (1) are positioned on the same side of the mask grating (3) and act on the same position of the mask grating (3); the filtering device and the excitation laser beam (1) are respectively positioned at two opposite sides of the mask grating (3), the filtering device comprises a plurality of absorption baffles (43), the absorption baffles (43) are used for absorbing zero-order diffraction light and high-order diffraction light for shielding the excitation laser beam (1) and absorbing the zero-order diffraction light and the high-order diffraction light for shielding the detection laser beam (2) at the same time, leaving +/-1-order diffraction light of the excitation laser beam (1) to form an excitation beam pair and leaving +/-1-order diffraction light of the detection laser beam (2) at the same time, and dividing the +/-1-order diffraction light of the detection laser beam (2) into a detection beam (21) and a reference beam (22); continuous zooming imaging device (5), with mask grating (3) is located respectively the relative both sides of filter, continuous zooming imaging device (5) includes at least three first lens (51) that arrange the setting in proper order, and adjacent two the interval of first lens (51) is adjustable, excitation beam is to inciding into continuous zooming imaging device (5), and pass through all in proper order first lens (51) refraction back outgoing finally assembles, cross interference formation transient state grating on sample (7), still includes 4f device (4), 4f device (4) are located mask grating (3) with between continuous zooming imaging device (5), 4f device (4) include two relative second lens (44) that set up, filter is located two between second lens (44), 4f device (4) are used for receiving and refracting the 1 st order diffracted light of excitation laser beam (1), enabling the light beams after being diffracted and split by the mask grating (3) to coincide at an imaging position through confocal imaging of the 4f device (4) to form an image of the mask grating (3), wherein a front diaphragm of the continuous zooming imaging device (5) keeps a fixed distance from a back focal plane of the second lens (44) close to the continuous zooming imaging device (5); the mask grating (3) is a variable-frequency mask grating, the variable-frequency mask grating comprises a plurality of gratings with different frequencies, the excitation laser beam (1) and the detection laser beam (2) irradiate the same grating each time, and the excitation laser beam (1) and the detection laser beam (2) irradiate the gratings with different frequencies by moving the position of the mask grating (3), so that the diffraction beam splitting angle is controlled; the device is characterized by further comprising a detection device (6), wherein the detection device (6) and the continuous zooming imaging device (5) are positioned on two opposite sides of the sample (7), the detection laser beam (2) is diffracted through the transient grating, and the detection device (6) is used for receiving diffracted light of the detection laser beam (2).
2. The laser transient grating system with continuously adjustable spatial period according to claim 1, characterized in that the excitation laser beam (1) is a short pulse laser or an ultra-short pulse laser and the detection laser beam (2) is a narrow linewidth continuous laser or a synchronous long pulse laser.
3. The laser transient grating system of claim 1, further comprising an attenuation sheet (42), wherein said attenuation sheet (42) is located between two of said second lenses (44) and in the optical path of said reference beam (22).
4. The laser transient grating system with continuously adjustable spatial period as claimed in claim 3, further comprising a glass sheet (41), wherein said glass sheet (41) is located between two of said second lenses (44), said glass sheet (41) is equal in thickness to said attenuation sheet (42), and said glass sheet (41) is located in the optical path of said probe beam (21).
5. The laser transient grating system with the continuously adjustable spatial period according to any one of claims 1 to 4, wherein the continuously variable-focus imaging device (5) further comprises a housing (52), all the first lenses (51) are disposed in the housing (52), the housing (52) comprises a light inlet and a light outlet which are oppositely arranged, the excitation light beam pair enters from the light inlet, is transmitted through all the first lenses (51), exits from the light outlet, and converges and interferes crosswise on the sample (7) to form the transient grating.
6. The laser transient grating system with the continuously adjustable spatial period according to claim 5, wherein the continuously variable-focus imaging device (5) further comprises a guide rail, the guide rail is disposed in the housing (52), all the first lenses (51) are slidably disposed on the guide rail, a plurality of adjusting components are disposed on an outer surface of the housing (52), a plurality of transmission components are disposed in the housing (52), each transmission component is correspondingly connected to one of the first lenses (51), and each adjusting component is used for adjusting linkage of at least one of the transmission components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811457616.6A CN109459415B (en) | 2018-11-30 | 2018-11-30 | Laser transient grating system with continuously adjustable space period |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811457616.6A CN109459415B (en) | 2018-11-30 | 2018-11-30 | Laser transient grating system with continuously adjustable space period |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109459415A CN109459415A (en) | 2019-03-12 |
| CN109459415B true CN109459415B (en) | 2021-06-15 |
Family
ID=65612158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811457616.6A Active CN109459415B (en) | 2018-11-30 | 2018-11-30 | Laser transient grating system with continuously adjustable space period |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109459415B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072406Y (en) * | 2007-08-06 | 2008-06-11 | 苏州大学 | Pump detecting device based on 4f phase coherent imaging |
| CN202472096U (en) * | 2012-03-16 | 2012-10-03 | 新朔光电科技股份有限公司 | Dual-telecentric continuous zoom imaging device |
| CN202614180U (en) * | 2012-03-23 | 2012-12-19 | 新朔光电科技股份有限公司 | Double telecentric continuous variable-focus imaging device of interferometer |
| CN202916182U (en) * | 2012-11-20 | 2013-05-01 | 合肥知常光电科技有限公司 | Material characteristic detecting device based on standing wave-induced transient grating effect |
| CN103235489A (en) * | 2013-05-15 | 2013-08-07 | 中国科学院光电技术研究所 | Method for variable period multi-beam interference photoetching |
| CN204116710U (en) * | 2014-09-26 | 2015-01-21 | 江苏大学 | A kind of two step diffraction phase imaging systems |
| CN108061959A (en) * | 2017-11-27 | 2018-05-22 | 昆山慕藤光精密光学仪器有限公司 | The accurate zooming system of zoom camera lens |
| CN108593106A (en) * | 2018-04-19 | 2018-09-28 | 南昌航空大学 | A kind of system and device of detection stimulated Brillouin scattering transient state ultrasonic grating spectrum |
| CN108871640A (en) * | 2018-06-13 | 2018-11-23 | 西安交通大学 | Residual stress nondestructive detection system and method based on transient grating Laser thermo-elastic generated surface acoustic waves |
-
2018
- 2018-11-30 CN CN201811457616.6A patent/CN109459415B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072406Y (en) * | 2007-08-06 | 2008-06-11 | 苏州大学 | Pump detecting device based on 4f phase coherent imaging |
| CN202472096U (en) * | 2012-03-16 | 2012-10-03 | 新朔光电科技股份有限公司 | Dual-telecentric continuous zoom imaging device |
| CN202614180U (en) * | 2012-03-23 | 2012-12-19 | 新朔光电科技股份有限公司 | Double telecentric continuous variable-focus imaging device of interferometer |
| CN202916182U (en) * | 2012-11-20 | 2013-05-01 | 合肥知常光电科技有限公司 | Material characteristic detecting device based on standing wave-induced transient grating effect |
| CN103235489A (en) * | 2013-05-15 | 2013-08-07 | 中国科学院光电技术研究所 | Method for variable period multi-beam interference photoetching |
| CN204116710U (en) * | 2014-09-26 | 2015-01-21 | 江苏大学 | A kind of two step diffraction phase imaging systems |
| CN108061959A (en) * | 2017-11-27 | 2018-05-22 | 昆山慕藤光精密光学仪器有限公司 | The accurate zooming system of zoom camera lens |
| CN108593106A (en) * | 2018-04-19 | 2018-09-28 | 南昌航空大学 | A kind of system and device of detection stimulated Brillouin scattering transient state ultrasonic grating spectrum |
| CN108871640A (en) * | 2018-06-13 | 2018-11-23 | 西安交通大学 | Residual stress nondestructive detection system and method based on transient grating Laser thermo-elastic generated surface acoustic waves |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109459415A (en) | 2019-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105466886B (en) | Middle infrared scanning system | |
| KR102144989B1 (en) | Low noise, high stability, deep ultra-violet, continuous wave laser | |
| JP6079863B2 (en) | Fourier transform infrared spectrophotometer | |
| CN107421910B (en) | Terahertz strong field system of ultrashort pulse pump based on wave surface inclination method | |
| US7385693B2 (en) | Microscope apparatus | |
| CN109459415B (en) | Laser transient grating system with continuously adjustable space period | |
| JP6384589B2 (en) | Light attenuator | |
| CN105092032B (en) | Transient state high resolution spectrometer based on F-P etalons | |
| CN116773147A (en) | Laser output light spot characteristic measuring device and method | |
| KR101620594B1 (en) | spectroscopy apparatus | |
| JP2005317669A (en) | Terahertz wave generator and measuring instrument using it | |
| CN116908135A (en) | Broadband terahertz Bessel beam transmission detection device and detection imaging method | |
| CN105973480A (en) | Grating secondary diffraction type laser wavelength meter | |
| US10082456B2 (en) | Photothermal conversion spectroscopic analyzer | |
| CN106404695B (en) | Spectrophotometer | |
| CN114295064A (en) | Optical measurement device, optical measurement method, and photoacoustic film thickness measurement system | |
| JP4074271B2 (en) | Time-resolved spectrometer | |
| CN207423365U (en) | Spectrometer and spectral detection system | |
| CN110824679A (en) | Total reflection type coaxial LIBS excitation collection system and collection method thereof | |
| CN111562002A (en) | High-flux high-resolution high-contrast polarization interference spectrum imaging device and method | |
| RU2808750C1 (en) | Device for measuring parameters and characteristics of radiation sources | |
| CN113507775B (en) | Multipurpose optical Thomson scattering spectrum measuring system suitable for large-scale laser device | |
| CN211505195U (en) | Device for realizing double-beam pumping in femtosecond transient absorption spectrometer | |
| CN116892883B (en) | Inclination displacement sensor and optical anti-shake system | |
| RU125691U1 (en) | INTERFEROMETER FOR CONTROL OF TELESCOPIC SYSTEMS AND OBJECTS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |