CN1786750A - Device for generating multi-pulse by utilizing Dammann grating pair - Google Patents
Device for generating multi-pulse by utilizing Dammann grating pair Download PDFInfo
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Abstract
A device for generating multi-pulse by utilizing Dammann grating pair comprises a main grating, wherein the main grating is a 1xn reflection type Dammann grating, n is a positive integer, two sides of a perpendicular normal line from the L position of the main grating are symmetrically provided with n/2 pieces of reflection type compensation gratings in the diffraction light direction of corresponding diffraction orders, the reflection type compensation gratings are respectively called a first-order Dammann grating, a third-order Dammann grating, a fifth-order Dammann grating and … …, the distance between the two Dammann gratings of each order is b, the period of the main grating is d, the period of the third-order Dammann grating is d/3, and the period of the fifth-order Dammann grating is d/5 … …; the distance s between the two sides of the main grating and the working surface of the compensation grating is provided with a first total reflector, a second total reflector and a mechanism for separating output light from input light. The device can compress the pulse with the positive chirp and form a plurality of pulses with the same wavelength and adjustable pulse intervals.
Description
Technical field
The present invention relates to Darman raster, particularly a kind of Darman raster that utilizes is to producing multipulse device
Technical background
Generally, grating pair is used to the compression of laser pulse as a kind of device with negative dispersion character.The grating that is adopted is that (1000 lines/mm-2000 line/mm), the manufacture difficulty of grating is bigger, the cost height for high dencity grating mostly; And this device does not produce multiple-pulse; Common grating can cause the intensity difference of each order of diffraction time very big, is applied in the device that our bottom mentions and also is difficult to obtain multiple-pulse.
The common methods that produces dipulse is by Michelson interferometer, the dipulse device of dual wavelength is also arranged, but they can not compress to input pulse.
The Darman raster that line density is low excessively is (less than 10 lines/mm), paired pulses does not have pinch effect; Line density is excessive, and (greater than 100 lines/mm), just become high dencity grating, manufacture difficulty and cost problem just display again.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of Darman raster that utilizes to producing multipulse device, this device should obtain the multiple-pulse of co-wavelength, pulse be adjustable at interval, and align the pulse of warbling compression effectiveness arranged.Require to make than being easier to, cost is also lower.
Technical solution of the present invention is as follows:
A kind of Darman raster that utilizes is to producing multipulse device, its formation comprises key light grid, these key light grid are the 1xn reflective dammann grating, wherein n is a positive integer, apart from these key light grid L place, the both sides of the normal of Chuiing in the inferior diffraction light direction of the corresponding order of diffraction, are provided with n/2 blocks of reflecting null grating symmetrically therein, be called the one-level Darman raster, three grades of Darman rasters, the Pyatyi Darman raster ... distance between two Darman rasters of each grade time is b, the cycle of described key light grid is d, and the cycle of three grades of Darman rasters is d/3, and the cycle of Pyatyi Darman raster is d/5 At a distance of the s place, first completely reflecting mirror and second completely reflecting mirror are arranged respectively at the workplace of the both sides of key light grid and described null grating, described L and b, s should satisfy the following relationship formula:
L≥2D·d/(4λ
0-(m+|m-2|)·Δλ)
b＝2Ltgα
s≥Φctgα
In the formula:
The cycle of d-key light grid,
λ
0The centre wavelength of-input laser,
Δ λ-input laser bandwidth,
D-incident beam diameter,
The m-order of diffraction is inferior,
The plus or minus m order diffraction diffraction of light angle of α-key light grid;
The diameter of Φ-first completely reflecting mirror, second completely reflecting mirror;
To export light in addition and import the mechanism that light separates.
Described light and the mechanism that separates of input light of will exporting is that the reflecting surface of first completely reflecting mirror and second completely reflecting mirror and null grating has an angle theta, and θ＜5.
The described light of will exporting is on the normal of key light grid with the mechanism that input light separates, promptly along on the incident ray direction, be disposed with polarization medium template (4) and the quarter wave plate (5) at 45 with light path, this polarization medium template (4) is to the P polarized light total transmissivity of 45 ° of incidents, and to the total reflection of S polarized light.
Described n=2.
In the described null grating, there are one or more null gratings to place on the micropositioner.
The density of described Darman raster is 10 lines/mm-100 line/mm.
Technique effect of the present invention:
Our experiments show that: because the present invention is by having selected the suitable line density (Darman raster of 10 lines/mm-100 line/mm), utilize Darman raster to export the character of each order of diffraction time isocandela, obtained the multiple-pulse of co-wavelength, pulse be adjustable at interval, and can align the pulse of warbling and realize compression.Because the line density of the Darman raster that is adopted is not high, to make than being easier to, cost is also lower.Apparatus of the present invention are processed at femtosecond laser, and there is good application prospects in fields such as shaping pulse, and dipulse also has application in the femtosecond laser fields of measurement.
Description of drawings
Fig. 1 is apparatus of the present invention theory structure synoptic diagram
Fig. 2 is the structural representation of the embodiment of the invention 1
Fig. 3 is the structural representation of the embodiment of the invention 2
Fig. 4 is the structural representation of the embodiment of the invention 3
Fig. 5 is the structural representation of the embodiment of the invention 4
Fig. 6 is the structural representation of the embodiment of the invention 5
Embodiment
See also Fig. 1 earlier, Fig. 1 is apparatus of the present invention structural representations, as seen from the figure, the present invention utilizes Darman raster to producing multipulse device, comprises key light grid 1, and these key light grid 1 are the 1xn reflective dammann grating, wherein n is a positive integer, apart from these key light grid 1L place, the both sides of the normal of Chuiing therein are in the diffraction light direction of the corresponding order of diffraction time, be arranged with n/2 blocks of reflecting null grating 21 symmetrically, 23,25 ... 2 (n-1); 31,33,35,3 (n-1) are called one-level Darman raster 21,31, three grades of Darman rasters 23,33, Pyatyi Darman raster 25,35 ..., the distance between two Darman rasters of each grade time is b, the cycle of described key light grid 1 is d, and the cycle of three grades of Darman rasters 23,33 is d/3, the cycle of Pyatyi Darman raster 25,35 is d/5 At a distance of the s place, first completely reflecting mirror 2 and second completely reflecting mirror 3 are arranged respectively at the workplace of the both sides of key light grid 1 and described null grating, described L and b, s should satisfy the following relationship formula:
L≥2D·d/(4λ
0-(m+|m-2|)·Δλ)
b＝2Ltgα
s≥Φctgα
In the formula:
The cycle of d-key light grid 1,
λ
0The centre wavelength of-input laser,
Δ λ-input laser bandwidth,
D-incident beam diameter,
The m-order of diffraction is inferior,
The plus or minus m order diffraction diffraction of light angle of α-key light grid 1;
The diameter of Φ-first completely reflecting mirror, second completely reflecting mirror;
To export light in addition and import the mechanism that light separates.
In order to make the different orders of diffraction separately inferior, L has a minimum value L
Min=2Dd/ (4 λ
0-(m+|m-2|) Δ λ), the distance b between two blocks of gratings of the same order of diffraction time is not arbitrarily, b=2Ltg α; 21,31, three grades of Darman rasters 23,33 of key light grid 1 and one-level Darman raster, Pyatyi Darman raster 25,35 ... normal direction parallel.Light after the compensation incides first completely reflecting mirror 2 and second completely reflecting mirror 3 respectively, and light after reflection returns by former road, and the output light that obtains is multiple-pulse.Diameter of phi one timing when first completely reflecting mirror 2 and second completely reflecting mirror 3, this first completely reflecting mirror 2, second completely reflecting mirror 3 and one-level Darman raster 21,31, three grades of Darman rasters 23,33, Pyatyi Darman raster 25,35 ... between neither be arbitrarily apart from s, the too little diffraction light that can hinder key light grid 1 of s is so there is a minimum value s
Min=Φ ctg α.
We are with dipulse, and four pulses, six pulses are that example is further described the present invention.We adopt 1 * 2,1 * 4 respectively, 1 * 6 even number reflective dammann grating grating 1 of deciding.
Embodiment 1:
As shown in Figure 2, key light grid 1 are 1 * 2 reflective dammann gratings, and the cycle is 25 μ m, with its at a distance of two identical 1 * 2 reflective one-level Darman rasters 21,31 of 30cm place placement grating by way of compensation; The axis of symmetry of two one-level Darman rasters 21,31 is on the normal of key light grid 1, and the normal direction of key light grid 1 and one-level Darman raster 21,31 is parallel.The central horizontal distance of the two is 2cm.Place first completely reflecting mirror 2 and second completely reflecting mirror 3 in the place of distance one-level Darman raster 21,31 35cm;
Have the laser pulse normal incidence of just warbling and arrive key light grid 1, its positive and negative first-order diffraction light incides one-level Darman raster 21,31 respectively; Reflected light is by first completely reflecting mirror 2 and 3 reflections of second completely reflecting mirror, and the surface of first completely reflecting mirror 2 and second completely reflecting mirror 3 and pedal line have a very little angle (less than 5.) θ; The angle that 2 θ are then arranged through the light before and after the catoptron is to realize separating on emergent light and the incident light space; Final emergent light and incident light also have the angle of 2 θ.Wherein we are by adopting stroke 12.5cm, and minimum resolution is 1 μ m, and least count is that the micropositioner of 10 μ m comes mobile one-level Darman raster 21,31, and by regulating them, we can realize between the dipulse at interval adjustable arbitrarily.By selection, can realize compression to laser pulse with different positive chirp values to the Darman raster cycle.
Embodiment 2:
We can adopt another kind of mode to make input light and output light separately.As shown in Figure 3, on the normal of key light grid 1,, be disposed with polarization medium template 4 and the quarter wave plate 5 at 45 with light path promptly along on the incident ray direction, the P polarized light full impregnated of 4 pairs of 45 ° of incidents of this polarization medium template, and the S polarized light is all-trans.If incident light is the p polarization, export light so because twice process quarter wave plate 5 can become the s polarization.Make the p polarized light transmission, 45 ° of total reflections of s polarized light have just realized separating of output light and input light.
Embodiment 3:
The structure of present embodiment and embodiment 2 is basic identical, as shown in Figure 4, and when diameter of phi one timing of first completely reflecting mirror 2 and second completely reflecting mirror 3, they and one-level Darman raster 21, between 31 is not arbitrarily apart from s, and the too little diffraction light that can hinder key light grid 1 of s is so there is a minimum value s
Min=Φ ctg α; α is the angle of diffraction of the positive and negative one-level of Darman raster that adopted.
The input pulse that is recorded by the second harmonic frequency resolution optical switchgear of standard in the experiment is that chirp value is 0.00031rad/fs, input pulse 88.5fs, the output pulse is the dipulse of 46.2fs, has tangible pulse compression, by regulating one- level Darman raster 21,31, can obtain the dipulse in a series of different recurrent intervals.
Embodiment 4:
The structure of present embodiment as shown in Figure 5, key light grid 1 are 1 * 4 reflective dammann gratings, the cycle is 60 μ m, at three grades of Darman rasters 23,33 grating by way of compensation that at a distance of two identical one-level Darman rasters 21,31 of 30cm place placement and cycle is 20 μ m; Their axis of symmetry is all on the normal of key light grid 1, their position is determined by incident light, makes light incide the center of one- level Darman raster 21,31 through the positive and negative first-order diffraction light in key light grid 1 back, positive and negative three order diffraction light incide the center of three grades of Darman rasters 23,33.The normal direction of key light grid 1 and one- level Darman raster 21,31 and three grades of Darman rasters 23,33 is parallel.First completely reflecting mirror 2 and second completely reflecting mirror 3 are placed in place at the 35cm of distance one- level Darman raster 21,31 and three grades of Darman rasters 23,33;
Have with light path at 45 polarization medium template 4 and the quarter wave plate 5 of laser pulse through setting gradually of just warbling, normal incidence is to key light grid 1, and its positive and negative first-order diffraction light incides one- level Darman raster 21,31 respectively, positive and negative three order diffraction light incide three grades of Darman rasters 23,33 respectively; Reflected light is by first total reflective mirror 2 and the reflection of second total reflective mirror 3, returns once more through quarter wave plate 5 and the 4 reflection outputs of polarization medium template by former road, to realize separating on emergent light and the incident light space; Come mobile one- level Darman raster 21,31 and three grades of Darman rasters 23,33 by micropositioner equally, we can realize between four pulses at interval adjustable arbitrarily.
Embodiment 5:
The structure of present embodiment as shown in Figure 6, key light grid 1 are 1 * 6 reflective dammann grating, cycle is 60 μ m, place two identical one-level Darman rasters 21 at a distance of the 30cm place, 31, the cycle is three grades of Darman rasters 23,33 of 20 μ m, cycle is Pyatyi Darman raster grating 25,35 grating by way of compensation of 12 μ m; One-level Darman raster 21,31, three grades of Darman rasters 23,33 and the axis of symmetry of Pyatyi Darman raster 25,35 all on the normal of key light grid 1, their position is determined by incident light, make light incide one-level Darman raster 21 through the positive and negative first-order diffraction light in key light grid 1 back, 31 center, positive and negative three order diffraction light incide the center of three grades of Darman rasters 23,33, positive and negative Pyatyi diffraction light incides the center of Pyatyi Darman raster 25,35.The normal direction of key light grid 1 and one-level Darman raster 21,31, three grades of Darman rasters 23,33 and Pyatyi Darman raster 25,35 is parallel.In distance one-level Darman raster 21,31, three grades of Darman rasters 23,33 and Pyatyi Darman raster 25,35 distances for placing first completely reflecting mirror 2 and second completely reflecting mirror 3 in the place of 35cm;
Have the laser pulse of just warbling through setting gradually with light path polarization medium template 4 at 45 and quarter wave plate 5 normal incidences to key light grid 1, its positive and negative first-order diffraction light incides one- level Darman raster 21,31 respectively; Positive and negative three order diffraction light incide three grades of Darman rasters 23,33 respectively; Positive and negative Pyatyi diffraction light incides Pyatyi Darman raster 25,35 respectively; Reflected light is respectively by first completely reflecting mirror 2 and the reflection of second completely reflecting mirror 3, returns by former road and passes through quarter wave plate 5 once more, by the 4 reflection outputs of polarization medium template, to realize separating on emergent light and the incident light space; Come mobile one- level Darman raster 21,31, three grades of Darman rasters 23,33 or/and Pyatyi Darman raster 25,35 by micropositioner, we can realize between six pulses at interval adjustable arbitrarily.
Above embodiment explanation, utilize apparatus of the present invention, can acquire the multiple-pulse of adjustable pulse interval, and align the laser pulse of warbling tangible compression effectiveness is arranged, the Darman raster that adopts the also high dencity grating of general pulse shortener is made easily, and cost reduces a lot.Multiple-pulse is processed at femtosecond laser, and there is good application prospects in fields such as shaping pulse, and dipulse also has application in the femtosecond laser fields of measurement.
Claims (6)
1, a kind of Darman raster that utilizes is to producing multipulse device, it is characterized in that constituting and be: comprise key light grid (1), these key light grid are the 1xn reflective dammann grating, and wherein n is a positive integer, apart from this key light grid (1) L place, the both sides of the normal of Chuiing therein, in the inferior diffraction light direction of the corresponding order of diffraction, be provided with n/2 blocks of reflecting null grating (21,23 symmetrically, 25 ... 2 (n-1); 31,33,35,3 (n-1)), be called one-level Darman raster (21,31), three grades of Darman rasters (23,33), Pyatyi Darman raster (25,35) ..., the distance between two Darman rasters of each grade time is b, the cycle of described key light grid (1) is d, and the cycle of three grades of Darman rasters (23,33) is d/3, the cycle of Pyatyi Darman raster (25,35) is d/5 At a distance of the s place, first completely reflecting mirror (2) and second completely reflecting mirror (3) are arranged respectively at the workplace of the both sides of key light grid (1) and described null grating, described L and b, s should satisfy the following relationship formula:
L≥2D·d/(4λ
0-(m+|m-2|)·Δλ)
b＝2Ltgα
s≥Φctgα
In the formula:
The cycle of d-key light grid (1),
λ
0The centre wavelength of-input laser,
Δ λ-input laser bandwidth,
D-incident beam diameter,
The m-order of diffraction is inferior,
The plus or minus m order diffraction diffraction of light angle of α-key light grid (1);
The diameter of Φ-first completely reflecting mirror, second completely reflecting mirror;
To export light in addition and import the mechanism that light separates.
2, the Darman raster that utilizes according to claim 1 is to producing multipulse device, it is characterized in that described light and the mechanism that separates of input light of will exporting is that the reflecting surface of described first completely reflecting mirror (2) and second completely reflecting mirror (3) and described null grating has an angle theta, and θ＜5 °
3, the Darman raster that utilizes according to claim 1 is to producing multipulse device, it is characterized in that the described light of will exporting is on the normal of key light grid (1) with the mechanism that input light separates, promptly along on the incident ray direction, be disposed with polarization medium template (4) and the quarter wave plate (5) at 45 with light path, this polarization medium template (4) is to the P polarized light total transmissivity of 45 ° of incidents, and to the total reflection of S polarized light.
4, the Darman raster that utilizes according to claim 1 is characterized in that described n=2 to producing multipulse device.
5, according to each described Darman raster that utilizes of claim 1 to 5 to producing multipulse device, it is characterized in that in the described null grating having one or more null gratings to place on separately the micropositioner.
6, the Darman raster that utilizes according to claim 5 is to producing multipulse device, and the line density that it is characterized in that described Darman raster is 10 lines/mm-100 line/mm.
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| CNB2005101109708A CN1325946C (en) | 2005-11-30 | 2005-11-30 | Device for generating multi-pulse by utilizing Dammann grating pair |
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|---|---|---|---|
| CNB2005101109708A CN1325946C (en) | 2005-11-30 | 2005-11-30 | Device for generating multi-pulse by utilizing Dammann grating pair |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100428040C (en) * | 2006-08-22 | 2008-10-22 | 中国科学院上海光学精密机械研究所 | Femtosecond double-pulse grating device |
| CN100442134C (en) * | 2006-08-22 | 2008-12-10 | 中国科学院上海光学精密机械研究所 | Femtosecond pulse compression device |
| CN106735868A (en) * | 2017-02-21 | 2017-05-31 | 长春理工大学 | Laser interference micro-nano technology device and method based on reflective dammann grating beam splitting |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5629801A (en) * | 1995-06-07 | 1997-05-13 | Silicon Light Machines | Diffraction grating light doubling collection system |
| CN1155148C (en) * | 1998-07-31 | 2004-06-23 | 中国科学院物理研究所 | Method and device for broadening ultrashort laser pulse without aberration completely |
| US6739728B2 (en) * | 2002-04-08 | 2004-05-25 | The Regents Of The University Of California | Short pulse laser stretcher-compressor using a single common reflective grating |
| CN1185461C (en) * | 2003-02-28 | 2005-01-19 | 清华大学 | Frequency shift without chromatic aberration of wideband light source and device generation interferential heterodgne signal |
| CN1286225C (en) * | 2004-04-15 | 2006-11-22 | 中国科学院上海光学精密机械研究所 | Dammann grating beam splitting and angular dispersion compensation method for femtosecond laser pulse |
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2005
- 2005-11-30 CN CNB2005101109708A patent/CN1325946C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100428040C (en) * | 2006-08-22 | 2008-10-22 | 中国科学院上海光学精密机械研究所 | Femtosecond double-pulse grating device |
| CN100442134C (en) * | 2006-08-22 | 2008-12-10 | 中国科学院上海光学精密机械研究所 | Femtosecond pulse compression device |
| CN106735868A (en) * | 2017-02-21 | 2017-05-31 | 长春理工大学 | Laser interference micro-nano technology device and method based on reflective dammann grating beam splitting |
| CN106735868B (en) * | 2017-02-21 | 2018-10-23 | 长春理工大学 | Laser interference micro-nano technology device and method based on reflective dammann grating beam splitting |
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