CN110609372A - Debugging method for parallelism of grating surfaces of compressor of ultrashort pulse laser system - Google Patents
Debugging method for parallelism of grating surfaces of compressor of ultrashort pulse laser system Download PDFInfo
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- CN110609372A CN110609372A CN201910891143.9A CN201910891143A CN110609372A CN 110609372 A CN110609372 A CN 110609372A CN 201910891143 A CN201910891143 A CN 201910891143A CN 110609372 A CN110609372 A CN 110609372A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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Abstract
The invention relates to a debugging method for the surface parallelism of a compressor grating of an ultrashort pulse laser system, which belongs to the technical field of grating regulation, and regulates the surface parallelism of the compressor grating in the vertical direction by utilizing the space spectrum interference information of an upper sub-aperture and a lower sub-aperture of reference light and compressor output light, and regulates the surface parallelism of the compressor grating in the horizontal direction by utilizing the space spectrum interference information of a left sub-aperture and a right sub-aperture of the reference light and the compressor output light.
Description
Technical Field
The invention belongs to the technical field of grating adjustment, and particularly relates to a method for debugging the parallelism of a grating surface of a compressor of an ultrashort pulse laser system.
Background
Ultrashort ultrastrong pulse laser is an important tool for researching the interaction between laser and substances. Chirped pulse amplification is the most commonly used method for generating ultrashort ultrastrong pulse laser, and the limit output pulse is obtained by stretching, amplifying and compressing a pulse laser source. In chirped pulse amplification systems, the compressor is a key component, typically consisting of a parallel grating pair. When the surface of the compressor grating is parallel to the scribe line, and the introduced negative dispersion compensates the positive dispersion introduced by the pulse laser source in the widening and amplifying process, the system can obtain the output pulse with extreme limit.
The adjustment of the compressor grating comprises plane parallel adjustment, reticle parallel adjustment and dispersion adjustment, wherein the plane parallel and reticle parallel are the prerequisite, and the compressor can perform dispersion compensation well only under the condition that the grating plane and the reticle are parallel. To adjust the plane-parallelism of the compressor gratings, jupengfei et al propose (see parallelism adjustment of a single working pair of compressor gratings, china laser, 2002, 29(6)) two methods. The first method is to observe the positions of the first-order diffraction light and the zero-order diffraction light relative to the incident light to realize regulation by utilizing the characteristic that the light beam returns along the original path when the grating surfaces are parallel; the second method is to perform blind adjustment by utilizing the characteristic that angular dispersion is generated when the grating is not parallel, and emergent light of two beams of incident parallel light after passing through the grating becomes non-parallel by the angular dispersion, and when the grating is adjusted, the emergent light of the two beams of incident parallel light after passing through the grating is also parallel. The first method has complicated adjusting steps, more light to be observed, more adjusting elements and large errors, and the first-order diffraction light and the zero-order diffraction light of the light beam passing through the small-hole diaphragm are weak and difficult to observe; the second method has no clear indication on the adjustment of the grating and can only be used as a criterion when the grating is well adjusted in parallel. Li rushing et al proposed using a right-angle prism to adjust the plane parallelism of a grating pair (see adjustment method of parallel grating pair, invention patent ZL200610031058.8), and using a right-angle prism with two surfaces perpendicular to each other, the right-angle prism can provide reference planes in two directions for moving a collimated light source to achieve the plane parallelism adjustment of the grating. In the debugging process, the positions of the collimation light source and the right-angle prism need to be changed, the operation is complex, and the light path needs to be rebuilt in each debugging. Summer autumn and the like propose that an autocorrelator and a far-field detector consisting of a Fabry-Perot interferometer, an achromatic mirror and a CCD are utilized to monitor the angle imbalance of the adjusting grating on line (an on-line monitoring and adjusting method of the grating imbalance of the visible light pulse compressor, China laser, 2016, 43(8)), the method needs a plurality of professional instruments, and is complex in monitoring light path structure and adjusting thought, so that the method is suitable for professionals familiar with the principle and structure of the whole system.
Disclosure of Invention
Aiming at various defects in the prior art and solving the problems, the debugging method for the parallelism of the grating surface of the compressor of the ultrashort pulse laser system is provided, has intuitive principle, simple operation and high precision, can simultaneously realize the precise adjustment of the parallelism of the grating surface of the compressor in the vertical direction and the horizontal direction, does not influence the main laser light path, and can be realized on line.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for debugging the parallelism of the grating surface of a compressor of an ultrashort pulse laser system comprises the following steps:
s1: adjusting the surface parallelism of the compressor grating in the vertical direction by utilizing the reference light and the space spectrum interference information of the upper sub-aperture and the lower sub-aperture of the output light of the compressor;
s2: and adjusting the surface parallelism of the compressor grating in the horizontal direction by utilizing the spatial spectrum interference information of the left sub-aperture and the right sub-aperture of the reference light and the output light of the compressor.
Preferably, the step S1 includes:
s11: selecting the upper sub-aperture and the lower sub-aperture of the output light of the compressor;
s12: collecting the space spectrum interference information of the upper edge sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionOn the upper part；
S13: collecting the empty spectrum interference information of the lower sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the empty spectrum interference fringe in the horizontal directionLower part；
S14: adjusting the pitch of the compressor grating;
s15: repeating the steps S12 to S14 to make POn the upper part＝PLower partI.e. the grating pairs are finished to be parallel in the vertical direction.
Preferably, the step S2 includes:
s21: selecting a left sub-aperture and a right sub-aperture of the output light of the compressor;
s22: collecting the spatial spectrum interference information of the left sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the spatial spectrum interference fringe in the horizontal directionLeft side of；
S23: collecting the space spectrum interference information of the right sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionRight side；
S24: adjusting the deflection of the grating of the compressor;
s25: repeating the steps S22 to S24 to make PLeft side of＝PRight sideI.e. the complete grating pair is plane-parallel in the horizontal direction.
Preferably, the debugging order of step S1 and step S2 is interchangeable.
Preferably, when the spatial spectrum interference fringe is monotonously changed and has no extreme point, the space between the two gratings is changed, so that the spatial spectrum interference fringe generates the extreme point.
The invention has the beneficial effects that:
the surface parallelism of the compressor grating in the vertical direction is adjusted by utilizing the space spectrum interference information of the upper sub-aperture and the lower sub-aperture of the reference light and the output light of the compressor, and the surface parallelism of the compressor grating in the horizontal direction is adjusted by utilizing the space spectrum interference information of the left sub-aperture and the right sub-aperture of the reference light and the output light of the compressor.
Drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a schematic view of the sub-aperture distribution of the output light from the compressor;
FIG. 3(a) is a schematic diagram of a spatial spectrum interference fringe with an extreme point;
FIG. 3(b) is a schematic diagram of FIG. 3(a) after binarization processing;
FIG. 4(a) is a schematic diagram of a spatial spectrum interference fringe with an extreme point;
FIG. 4(b) is a schematic diagram of FIG. 4(a) after binarization processing;
FIG. 5(a) is a schematic diagram of a spatial spectrum interference fringe without an extreme point;
FIG. 5(b) is a schematic diagram of a spatial spectrum interference fringe with extreme points generated by changing the spacing between two gratings;
fig. 5(c) is a schematic diagram of fig. 5(b) after the binarization process.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, a method for debugging the parallelism of the grating surface of a compressor of an ultrashort pulse laser system includes the following steps:
s1, adjusting the surface parallelism of the compressor grating in the vertical direction by utilizing the spatial spectrum interference information of the upper sub-aperture and the lower sub-aperture of the reference light and the output light of the compressor, specifically:
s11: selecting the upper edge sub-aperture D of the output light of the compressorOn the upper partAnd lower edge caliber DLower part；
S12: upper edge sub-aperture D for collecting reference light and output light of compressorOn the upper partMarking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionOn the upper partAs shown in fig. 3, fig. 3(a) shows that there is an extreme point of the spatial spectrum interference fringe, and the binarization processing is performed on fig. 3(a) to obtain a plurality of curves with alternate light and dark, as shown in fig. 3(b), the extreme points of the curves are basically overlapped in the vertical direction, and the position P of the marked extreme point in the horizontal direction is markedOn the upper part；
S13: lower edge sub-aperture D for collecting reference light and output light of compressorLower partMarking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionLower partAs shown in fig. 4, fig. 4(a) shows that there is an extreme point of the spatial spectrum interference fringe, and the binarization processing is performed on fig. 4(a) to obtain a plurality of curves with alternate light and dark, as shown in fig. 4(b), the extreme points of the curves are substantially overlapped in the vertical direction, and the position P of the extreme point in the horizontal direction is markedLower part；
S14: adjusting the pitch of the compressor grating;
s15: repeating the steps S12 to S14 to make POn the upper part＝PLower partI.e. the grating pairs are finished to be parallel in the vertical direction.
S2, utilizing the reference light and the left sub-aperture D of the output light of the compressorLeft side ofRight minor caliber DRight sideThe spatial spectrum interference information of (2) adjusts the surface parallelism of the compressor grating in the horizontal direction, specifically:
s21: selecting a left sub-aperture and a right sub-aperture of the output light of the compressor;
s22: miningLeft sub-aperture D integrating reference light and output light of compressorLeft side ofMarking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionLeft side of；
S23: right sub-aperture D for collecting reference light and output light of compressorRight sideMarking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionRight side；
S24: adjusting the deflection of the grating of the compressor;
s25: repeating the steps S22 to S24 to make PLeft side of＝PRight sideI.e. the complete grating pair is plane-parallel in the horizontal direction.
Meanwhile, in some other embodiments, the debugging sequence of step S1 and step S2 may be interchanged, that is, the debugging method is performed in the order of executing S2 first and then executing S1. In addition, in some other embodiments, when the spatial spectrum interference fringe changes monotonously and has no extreme point, the spacing between the two gratings is changed, so that the spatial spectrum interference fringe generates the extreme point. As shown in fig. 5(a), the null spectrum interference fringe has no extreme point, fig. 5(b) is a null spectrum interference fringe with an extreme point generated by changing the distance between two gratings, and a plurality of curves with alternate light and dark are obtained by performing binarization processing on fig. 5(b), and as shown in fig. 5(c), the extreme points of the curves are substantially overlapped in the vertical direction.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (5)
1. A debugging method for parallelism of a grating surface of a compressor of an ultrashort pulse laser system is characterized by comprising the following steps:
s1: adjusting the surface parallelism of the compressor grating in the vertical direction by utilizing the reference light and the space spectrum interference information of the upper sub-aperture and the lower sub-aperture of the output light of the compressor;
s2: and adjusting the surface parallelism of the compressor grating in the horizontal direction by utilizing the spatial spectrum interference information of the left sub-aperture and the right sub-aperture of the reference light and the output light of the compressor.
2. The debugging method according to claim 1, wherein said step S1 comprises:
s11: selecting the upper sub-aperture and the lower sub-aperture of the output light of the compressor;
s12: collecting the space spectrum interference information of the upper edge sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionOn the upper part；
S13: collecting the empty spectrum interference information of the lower sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the empty spectrum interference fringe in the horizontal directionLower part；
S14: adjusting the pitch of the compressor grating;
s15: repeating the steps S12 to S14 to make POn the upper part＝PLower partI.e. the grating pairs are finished to be parallel in the vertical direction.
3. The debugging method according to claim 1, wherein said step S2 comprises:
s21: selecting a left sub-aperture and a right sub-aperture of the output light of the compressor;
s22: collecting the spatial spectrum interference information of the left sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the spatial spectrum interference fringe in the horizontal directionLeft side of；
S23: collecting the space spectrum interference information of the right sub-aperture of the reference light and the output light of the compressor, and marking the position P of the extreme point of the space spectrum interference fringe in the horizontal directionRight side；
S24: adjusting the deflection of the grating of the compressor;
s25: repeating the steps S22 to S24 to make PLeft side of＝PRight sideI.e. the complete grating pair is plane-parallel in the horizontal direction.
4. The debugging method according to claim 2 or 3, wherein the debugging order of step S1 and step S2 can be interchanged.
5. The debugging method of claim 4, wherein when the spatial spectrum interference fringe is monotonously changed and has no extreme point, the spacing between the two gratings is changed to make the spatial spectrum interference fringe generate the extreme point.
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