CN208721256U - A kind of subnanosecond laser pulse contrast measuring device - Google Patents
A kind of subnanosecond laser pulse contrast measuring device Download PDFInfo
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- CN208721256U CN208721256U CN201821446854.2U CN201821446854U CN208721256U CN 208721256 U CN208721256 U CN 208721256U CN 201821446854 U CN201821446854 U CN 201821446854U CN 208721256 U CN208721256 U CN 208721256U
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Abstract
Utility model discloses a kind of subnanosecond laser pulse contrast measuring device.In the measuring device, light is become reflected light and transmitted light after spectroscope by tested high power ultra-short laser pulse square beam of light, reflected light becomes a series of convergent laser trains of pulse that there is set time delay each other after pulse-delay unit, frequency-doubling crystal is projected simultaneously with the transmission square beam of light carries out frequency transformation, it is formed after frequency-doubling crystal up and down at equal intervals, there are a plurality of autocorrelation signals of set time delay each other, last imaged lens imaging is acquired to CCD, processing, obtain the contrast ration information of magnitude of subnanosecond time record length.The setup time record length of utility model is wide, at low cost, structure is simple, easy to adjust.
Description
Technical field
Utility model belongs to ultrashort laser pulse the field of test technology, and in particular to a kind of subnanosecond laser pulse contrast
Measuring device.
Background technique
Contrast ration is a key index of high power ultrashort laser device performance and application, at present ultrashort laser arteries and veins
Contrast measurement is rushed mainly using correlation method.The China of entitled " apparatus for measuring high power ultra-short laser pulse contrast " is practical
New patent (patent No.: ZL 200720077677.0) discloses a kind of by non-colinear harmonic conversion acquisition third-order correlation letter
Number contrast ration measurement method, the method due to repeatedly transmiting light splitting using plate glass can only obtain in impulse waveform
The contrast information of several particular point in time；The Chinese invention of entitled " device for measuring contrast ratio of single-time ultrashort laser pulses "
Patent (patent No.: ZL2009 1 0263670.1) discloses a kind of to the third-order correlation signal progress main pulse of generation and pre- arteries and veins
The method for rushing subregion measurement obtains contrast information；Entitled " a kind of device for measuring contrast ratio of single-time ultrashort laser pulses "
Chinese utility model patent (patent No.: ZL2010 2 0293190.8) discloses a kind of cascade method of use and obtains master respectively
The third-order correlation signal of pulse and prepulsing measures main phase OFF signal and edge coherent signal using respective detector respectively
Method completes the measurement of single ultrashort laser pulse contrast；A kind of entitled " high power ultra-short laser pulse contrast measurement dress
Set " Chinese invention patent (patent No.: ZL 201510000961.7) disclose a kind of method using optical Limiting to be promoted pair
Than the dynamic range of degree test.These measuring devices are limited to crystalline size although improving dynamic range, can only measure pulsewidth
Contrast information in about ten picosecond ranges.
Summary of the invention
In order to overcome time record length of the existing measuring device in the measurement of ultrashort laser pulse contrast narrow not
Foot, utility model provide a kind of subnanosecond laser pulse contrast measuring device.
Utility model solves technical solution used by its technical problem:
The subnanosecond laser pulse contrast measuring device of utility model, its main feature is that, in the measuring device, in height
Be provided with beam splitter in power ultrashort laser pulse square beam of light incident direction, incident pulse light through beam splitter be divided into transmitted light and
Reflected light.Reflecting mirror I, light path regulating mechanism, reflecting mirror II are disposed on the transmitted light path of beam splitter.In beam splitter
Reflecting mirror III, pulse-delay unit, frequency-doubling crystal are disposed on reflected light path；The transmitted light of beam splitter is reflected through reflecting mirror I
Reflecting mirror II is projected after carrying out light path adjusting on to light path regulating mechanism, the reflected light of beam splitter is reflected into arteries and veins through reflecting mirror III
It rushes on delayer, by becoming existing each other a series of convergent laser trains of pulse of set time delay after pulse-delay unit,
The convergent laser train of pulse is assembled on frequency-doubling crystal, forms up and down horizontal linear beam string at equal intervals, the water
Flat linear beam string projects frequency-doubling crystal with the square beam of light reflected from reflecting mirror II simultaneously and carries out frequency transformation, in frequency multiplication crystalline substance
Equidistant horizontal linear frequency doubled light beam string up and down is formed after body.Set gradually in optical path after frequency-doubling crystal absorbing sheet, at
As lens, CCD；The basic frequency beam being emitted from frequency-doubling crystal is absorbed piece and absorbs, the linear frequency multiplication of the level being emitted from frequency-doubling crystal
Light beam string is transmitted to CCD after imaging len transmits, and imaging len is by the linear frequency doubled light beam string of the level on frequency-doubling crystal surface
It is imaged on the test surface of CCD.The external computer of CCD, the signal from CCD finally enter computer and carry out data processing.
The pulse-delay unit is made of three block elements；Plate I, plate II, cylindrical lens are set gradually in order；Plate
I is mounted on moving guide rail, and plate I and plate II are placed in an angle of wedge in the vertical direction each other；It is reflected from reflecting mirror III
Light penetrate plate I, transmit after multiple reflections, formed strong from plate II back and forth between plate I and the inner surface of plate II
Train of pulse that degree successively decreases, with set time delay is formed above and below a series of after cylindrical lens are assembled on cylindrical lens focal plane
At equal intervals, the adjacent horizontal linear beam string with set time delay.
Outer surface plating anti-reflection film, the inner surface of the plate I and plate II plate semi-transparent semi-reflecting film.
The frequency-doubling crystal is placed on the position of focal plane of cylindrical lens, is matched using 90 degree of I saphes of non-colinear, according to not
Same incident wavelength selects different crystalline materials.
The beneficial effect of utility model is:
Utility model uses the structure of similar Fabry-glass Luo Gan's interferometer to carry out pulse daley light splitting, by traditional correlation
The reference time measurement of instrument is promoted from several picosecond magnitudes to magnitude of subnanosecond, broadens the detection time starting point of prepulsing.
Detailed description of the invention
Fig. 1 is a kind of light path schematic diagram of subnanosecond laser pulse contrast measuring device of utility model；
Fig. 2 is the light path schematic diagram of the pulse-delay unit in utility model；
Fig. 3 is the single-shot time intensity autocorrelogram of CCD acquisition in utility model as arrangement schematic diagram；
Fig. 4 is the single-shot time intensity auto-correlation image mosaic schematic diagram of Fig. 3；
In figure, 1. beam splitter, 2. reflecting mirror, I 3. light path regulating mechanism, 4. reflecting mirror, II 5. reflecting mirror III 6.
9. imaging len of pulse-delay unit 7. frequency-doubling crystal, 8. absorbing sheet, 10. I 6-2. plate of CCD 6-1. plate, II 6-
3. cylindrical lens 6-4. moving guide rail.
Specific embodiment
Utility model is further illustrated with reference to the accompanying drawings and examples, but the protection of utility model should not be limited with this
Range.
Embodiment 1
Fig. 1 is a kind of subnanosecond laser pulse contrast measuring device light path schematic diagram of utility model；Fig. 2 is practical new
Pulse-delay unit light path schematic diagram in type is the A of the pulse-delay unit in Fig. 1 to side view；Fig. 3 is CCD in utility model
The single-shot time intensity autocorrelogram of acquisition is as arrangement schematic diagram；Fig. 4 is the single-shot time intensity auto-correlation image mosaic signal of Fig. 3
Scheme, character position indicates neighbouring image mosaic POS INT point in Fig. 3 in figure.In Fig. 1 ~ Fig. 4, one kind of utility model
In subnanosecond laser pulse contrast measuring device, it is provided in high power ultra-short laser pulse square beam of light incident direction point
Beam mirror 1, incident pulse light are divided into transmitted light and reflected light through beam splitter 1；It is disposed on the transmitted light path of beam splitter 1 anti-
Penetrate mirror I 2, light path regulating mechanism 3, reflecting mirror II 4；Reflecting mirror III 5, pulse are disposed on the reflected light path of beam splitter 1
Delayer 6, frequency-doubling crystal 7；The transmitted light of beam splitter 1 is reflected into progress light path adjusting on light path regulating mechanism 3 through reflecting mirror I 2
After project reflecting mirror II 4, the reflected light of beam splitter 1 is reflected on pulse-delay unit 6 through reflecting mirror III 5, passes through pulse daley
Become a series of convergent laser trains of pulse that there is set time delay each other after device 6, the convergent laser train of pulse exists
Assembled on frequency-doubling crystal 7, form up and down horizontal linear beam string at equal intervals, the horizontal linear beam string with from reflecting mirror
The square beam of light of II 4 reflections projects frequency-doubling crystal 7 simultaneously and carries out frequency transformation, is formed after frequency-doubling crystal 7 equidistant up and down
The linear frequency doubled light beam string of level；Absorbing sheet 8, imaging len 9, CCD10 are set gradually in the optical path after frequency-doubling crystal 7；From
The basic frequency beam that frequency-doubling crystal 7 is emitted is absorbed the absorption of piece 8, and the linear frequency doubled light beam string of the level being emitted from frequency-doubling crystal 7 passes through
Imaging len 9 is transmitted to CCD10 after transmiting, the linear frequency doubled light beam string of the level on 7 surface of frequency-doubling crystal is imaged by imaging len 9
On the test surface of CCD10；The external computer of CCD10, the signal from CCD10 finally enter computer and carry out data processing.
The pulse-delay unit 6 is made of three block elements；It is saturating that I 6-1 of plate, II 6-2 of plate, column are set gradually in order
Mirror 6-3；I 6-1 of plate is mounted on moving guide rail 6-4, and I 6-1 of plate and II 6-2 of plate are in a wedge in the vertical direction each other
It places at angle；Outer surface plating anti-reflection film, the inner surface of II 6-2 of I 6-1 of plate and plate plates semi-transparent semi-reflecting film；It is reflected from reflecting mirror III 5
Light penetrate I 6-1 of plate, transmitted back and forth from II 6-2 of plate after multiple reflections between the inner surface of II 6-2 of I 6-1 of plate and plate
Out, strength decrease, train of pulse with set time delay are formed, it is burnt in cylindrical lens 6-3 after cylindrical lens 6-3 convergence
A series of equidistant up and down, the adjacent horizontal linear beam strings with set time delay are formed on face.
The frequency-doubling crystal 7 is placed on the position of focal plane of cylindrical lens 6-3, is matched using 90 degree of I saphes of non-colinear, institute
The frequency-doubling crystal 7 stated selects KDP crystalline material.
In the device of utility model, frequency-doubling crystal 7 is placed at cylindrical lens 6-3 focal plane, the light reflected from reflecting mirror II 4
The horizontal linear beam of N row of Shu Yucong cylindrical lens 6-3 transmission is overlapped on frequency-doubling crystal 7, realizes frequency-doubled conversion in overlapping region,
The horizontal linear imaged lens 9 of frequency doubled light beam of the N row of generation are imaged on CCD10.
The basic principle of the subnanosecond laser pulse contrast measurement of utility model is: using II 6- of I 6-1 of plate and plate
2 two pieces of plates form the plate of similar Fabry-glass Luo Gan's interferometer to structure, as shown in Fig. 2, light beam is in the plate to it
Between multiple reflections back and forth, it is τ that time delay is formed after the plate is to transmission0=2d/c, energy variation multiplying power are R1R2
Train of pulse:
(1)
D is the spacing of plate pair in formula, and c is the light velocity in vacuum, R1、R2For plate I, the inner surface reflectivity of plate II,
Ii(t, x) indicate from plate to output, t moment, horizontal position be x locate, in chronological sequence sequentially i-th of pulsed light beam
Intensity；The plate is placed in micro locking angle, after the cylindrical lens that focal length is f are assembled, the shape on cylindrical lens focal plane
At the horizontal linear beam of N row between the upper and lower away from 2 α f of difference, τ is differed between the adjacent beams at the same horizontal position x0Time prolong
Late；After the N row linear beam (as shown in Figure 3) and measured pulse light beam carries out single-shot time intensity auto-correlation, obtained on CCD
The i-th row, horizontal position be x at image strength signal G (i, x) are as follows:
(2)
I is measured pulse intensity in formula, and β is proportionality coefficient, G(2)(τ) indicates that time delay is the intensity auto-correlation letter of τ
Number, the relative time-delay amount that τ is the i-th row, horizontal position is two incident basic frequency beams at x.Adjust the moving guide rail in Fig. 2
6-4 makes the horizontal position X of the (i-1)-th row0With the horizontal position-X of the i-th row0The time delay τ at place is equal, i.e., between plate pair
Meet away from d:
(3)
Then the x of the i-th row is belonged into section [- X0, X0] strength signal G (i, x) divided by (R1R2)iAfterwards, it is spliced to the 0th row
X belong to section [- (2i-1) X0, (2i+1) X0] strength signal image in (as shown in Figure 4), the image obtained after splicing is i.e.
Measure the intensity autocorrelogram picture of the measured pulse after length extension for the time, corresponding strength distribution curve is intensity from phase
Curve is closed, utility model is by the reference time measurement of coherent signal from 2 traditional β X0It is expanded to (2N-1) 2 β X0。
Using utility model measuring device measure subnanosecond laser pulse contrast the following steps are included:
1. aplanatism is calibrated.Pulse width is less than less than 1 picosecond, beam modulation near field degree less than 1.2, near field contrast
0.06 horizontal polarization square laser beam is input to the device, adjusts moving guide rail 6-4, makes in II 6-2 of I 6-1 of plate and plate
Surface is close to, and mobile light path regulating mechanism 3, the frequency doubled light for generating frequency-doubling crystal 7 is most strong, and most strong region is located at CCD10's
The most center of next line threadiness hot spot, the horizontal line shaped laser spot are denoted as 0 row, and the coordinate position of most strength is denoted as coordinate original
Point x=0, light beam more than 0 row are successively labeled as the 1st, 2 ... i ... row, as shown in Figure 3.
2. calibration of the plate to spacing.Light path regulating mechanism 3 is adjusted, the most strong frequency doubled light of 0 row is adjusted to rightmost position
It sets, the coordinate position is denoted as x=X0.Then moving guide rail 6-4 is adjusted, the most strong frequency doubled light for generating the 1st row appears in
Horizontal position x=-X0.Plate at this time is recorded to spacing d=d0, light path regulating mechanism 3 is then adjusted, most strong times generated is made
Frequency light returns to the coordinate origin x=0 of the 0th row；
3. contrast calculates.Using formula (2), the x of the i-th row is belonged into section [- X0, X0] intensity autocorrelation signal G
(i, x) is divided by (R1R2)iAfterwards, the x for being spliced to the 0th row belongs to section [- (2i-1) X0, (2i+1) X0] intensity autocorrelation signal figure
As in, the ratio of the intensity value G (0) of intensity value G (x) and coordinate origin after splicing at any x position of image: G (0)/G
(x) it is and main pulse time phase difference dx/ (cX0) at pulse contrast.
In the present embodiment, incident laser pulse wavelength is 1053nm, and pulse width is about 200ps, and energy is about 10mJ, light
Beam bore is 2cm, and horizontal polarization, frequency-doubling crystal 7 is KDP material, is matched using 90 degree non-colinear ooe.From pulse daley
The convergent laser train of pulse that device 6 transmits symmetrically is incident on again with the square beam of light reflected from reflecting mirror II 4 with about 30 degree of angle
The transformation of the enterprising line frequency of frequency crystal 7；The spacing of II 6-2 of I 6-1 of plate and plate in pulse-delay unit 6 is d0=3.6mm, it is corresponding
The time delay of 24ps, the angle of wedge are α=2mrad；The focal length of cylindrical lens 6-3 is f=500mm, and the Pixel size that CCD is used is lp=8
μm, pixel 2048 × 2048, the autocorrelogram picture of acquisition totally 9 row, proportionality coefficient β=0.58mm/ps, because this time measures length
Up to 24ps × 9=216ps, time sense is about 2 β lp=2×0.58mm/ps×8μm≈10fs。
Claims (4)
1. a kind of subnanosecond laser pulse contrast measuring device, it is characterised in that: super in high power in the measuring device
Be provided in short laser pulse square beam of light incident direction beam splitter (1), incident pulse light through beam splitter (1) be divided into transmitted light and
Reflected light；Reflecting mirror I (2), light path regulating mechanism (3), reflecting mirror II are disposed on the transmitted light path of beam splitter (1)
(4)；Reflecting mirror III (5), pulse-delay unit (6), frequency-doubling crystal (7) are disposed on the reflected light path of beam splitter (1)；Point
The transmitted light of Shu Jing (1) is reflected on light path regulating mechanism (3) after progress light path adjusting through reflecting mirror I (2) and projects reflecting mirror
The reflected light of II (4), beam splitter (1) is reflected on pulse-delay unit (6) through reflecting mirror III (5), after pulse-delay unit (6)
Become a series of convergent laser trains of pulse that there is set time delay each other, the convergent laser train of pulse is in frequency multiplication crystalline substance
Body is assembled on (7), forms up and down horizontal linear beam string at equal intervals, the horizontal linear beam string with from reflecting mirror II
(4) square beam of light reflected projects frequency-doubling crystal (7) simultaneously and carries out frequency transformation, is formed afterwards in frequency-doubling crystal (7) inferior
The linear frequency doubled light beam string of the level of spacing；Absorbing sheet (8), imaging len are set gradually in the optical path after frequency-doubling crystal (7)
(9), CCD(10)；The basic frequency beam being emitted from frequency-doubling crystal (7) is absorbed piece (8) and absorbs, the water being emitted from frequency-doubling crystal (7)
Horizontal line shape frequency multiplication light beam string is transmitted to CCD(10 after imaging len (9) transmit), imaging len (9) is by frequency-doubling crystal (7) table
The linear frequency doubled light beam string of level in face is imaged onto CCD(10) test surface on；CCD(10) external computer comes from CCD(10)
Signal finally enters computer and carries out data processing.
2. subnanosecond laser pulse contrast measuring device according to claim 1, it is characterised in that: the pulse is prolonged
Slow device (6) is made of three block elements；Plate I (6-1), plate II (6-2), cylindrical lens (6-3) are set gradually in order；Plate I
(6-1) is mounted on moving guide rail (6-4), and plate I (6-1) and plate II (6-2) are in an angle of wedge in the vertical direction each other
It places；The light reflected from reflecting mirror III (5) penetrates plate I (6-1), between plate I (6-1) and the inner surface of plate II (6-2)
Transmitted after multiple reflections from plate II (6-2) back and forth, formed strength decrease, with the set time delay train of pulse,
Through cylindrical lens (6-3) convergence after, formed on cylindrical lens (6-3) focal plane it is a series of up and down equidistant, adjacent have fix
The horizontal linear beam string of time delay.
3. subnanosecond laser pulse contrast measuring device according to claim 2, it is characterised in that: the plate I
Anti-reflection film is plated in the outer surface of (6-1) and plate II (6-2), inner surface plates semi-transparent semi-reflecting film.
4. subnanosecond laser pulse contrast measuring device according to claim 1, it is characterised in that: the frequency multiplication is brilliant
Body (7) is placed on the position of focal plane of cylindrical lens (6-3), is matched using 90 degree of I saphes of non-colinear.
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| CN201821446854.2U CN208721256U (en) | 2018-09-05 | 2018-09-05 | A kind of subnanosecond laser pulse contrast measuring device |
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| CN201821446854.2U CN208721256U (en) | 2018-09-05 | 2018-09-05 | A kind of subnanosecond laser pulse contrast measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060151A (en) * | 2018-09-05 | 2018-12-21 | 中国工程物理研究院激光聚变研究中心 | A kind of subnanosecond laser pulse contrast measuring device |
| CN112908126A (en) * | 2021-01-21 | 2021-06-04 | 潍坊学院 | Lens imaging experimental device with focusing state digital display function |
-
2018
- 2018-09-05 CN CN201821446854.2U patent/CN208721256U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060151A (en) * | 2018-09-05 | 2018-12-21 | 中国工程物理研究院激光聚变研究中心 | A kind of subnanosecond laser pulse contrast measuring device |
| CN109060151B (en) * | 2018-09-05 | 2023-08-15 | 中国工程物理研究院激光聚变研究中心 | Subnanosecond laser pulse contrast measuring device |
| CN112908126A (en) * | 2021-01-21 | 2021-06-04 | 潍坊学院 | Lens imaging experimental device with focusing state digital display function |
| CN112908126B (en) * | 2021-01-21 | 2022-07-08 | 潍坊学院 | Lens imaging experimental device with focusing state digital display |
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