Novel high-precision full-automatic electric control dispersion controller

Abstract

The utility model discloses a high-precision novel full-automatic electric control dispersion controller, comprising a base plate and a stepping motor, the base plate is provided with a three-dimensional adjusting rack 1, a rotation adjusting rack, a prism adjusting rack, a first grating adjusting rack, a second grating adjusting rack and a three-dimensional adjusting rack 2; a long-working-distance polarization-maintaining optical fiber collimator is installed on the first three-dimensional adjusting frame. According to the utility model, the mechanical structure has high flexibility, and different dispersion modules can be designed according to diffraction angles of different gratings; the distance between the gratings is coarsely adjusted by adjusting the position of a screw hole of the precise sliding table, the position of the screw hole can be parallel to the direction of diffraction light of the first grating, and therefore it is guaranteed that the diffraction light of the first grating can be emitted to the same position of the second grating all the time while the distance between the gratings is changed, and light path deviation is avoided. The grating spacing can be precisely adjusted through a precise pitch lead screw and a stepping motor in a precise rotation angle manner, and the precision is adjusted in a micron dimension.

Description

Technical Field

[0001] The utility model relates to the technical field of dispersion control, in particular to a high-precision novel fully automatic electrically controlled dispersion controller. Background Art

[0002] Dispersion control technology aims at the dispersion mismatch problem in femtosecond solid-state / fiber laser amplifier systems, provides a second-order dispersion that is conjugate with the system, completes the high-quality compression process of the system output pulse, and achieves a pulse width output of few cycles or hundreds of femtoseconds. The commonly used technical means at present are: using grating pairs to provide second-order dispersion with opposite signs to the laser system, and controlling the dispersion amount by controlling the spacing of the grating pairs. In view of the problem that the spacing of the grating pairs needs to be adjusted, the adapted grating spacing controller often uses a combination of a commercial grating adjustment frame and a translation stage. The commercial grating adjustment frame (eg. KM100CL, Thorlabs) uses a clamping arm and an adjustable angle structure. The clamping arm can be installed with a grating with a height of up to 33mm, and its angle adjustment range is ±4°; the translation stage can be used in both electric and manual modes to adapt to the needs of different scenarios.

[0003] The existing dispersion controller composed of a commercial grating adjustment frame and a displacement stage can meet the requirements of dispersion control to a certain extent, but it also has certain limitations. For commercial grating adjustment frames, although the structural clamping arm can flexibly adapt to gratings of different sizes, it is limited by the grating length during use and can only clamp small-sized gratings. As the grating length increases, the clamping stability will also be greatly reduced; and the connection between this type of adjustment frame and the displacement platform is difficult to achieve high stability, which is easy to cause mechanical drift, thereby affecting the stability of the optical path. For laser systems that work for a long time, they need to be adjusted regularly, which adds unnecessary time costs. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of high-precision fully automatic electronically controlled dispersion controller to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-precision novel fully automatic electrically controlled dispersion controller, comprising a base plate and a stepping motor, wherein a three-dimensional adjustment frame 1, a rotating adjustment frame, a prism adjustment frame, a first grating adjustment frame, a second grating adjustment frame and a three-dimensional adjustment frame 2 are installed on the base plate, a long working distance polarization-maintaining fiber collimator is installed on the three-dimensional adjustment frame 1, a half-wave plate is installed on the rotating adjustment frame, a right-angle prism is installed on the prism adjustment frame, a first sheet grating and a second sheet grating are installed on the first grating adjustment frame and the second grating adjustment frame, respectively, and the first sheet grating and the second sheet grating are arranged in parallel, the long working distance polarization-maintaining fiber collimator, the half-wave plate, the right-angle prism and the first sheet grating are arranged in sequence, a polarization beam splitter prism installed on the base plate is provided on one side of the right-angle prism, and the polarization beam splitter prism is arranged correspondingly to the right-angle prism, a right-angle prism pair is installed on the three-dimensional adjustment frame 2, and the right-angle prism pair is arranged correspondingly to the second sheet grating;

[0006] The stepper motor is installed on one side of the base plate, the output end of the stepper motor is connected to a precision lead screw, and a slide is installed on the precision lead screw, and the second grating adjustment frame and the three-dimensional adjustment frame are both installed on the slide.

[0007] Preferably, a plurality of screw holes are provided on the bottom plate.

[0008] Preferably, the three-dimensional adjustment frame and the rotation adjustment frame are fixed to the base plate through mechanical adapters.

[0009] Preferably, the prism adjustment frame and the first grating adjustment frame are both connected to the base plate via screws.

[0010] Preferably, the polarization beam splitter prism is mounted on the bottom plate via a polarization beam splitter prism frame.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) The mechanical structure of the utility model is highly flexible, and different dispersion modules can be designed according to the diffraction angles of different gratings;

[0013] (2) The spacing of the gratings of the utility model is roughly adjusted by adjusting the screw hole position of the precision slide, and the screw hole position can be set parallel to the diffracted light direction of the first grating, so as to ensure that when the grating spacing is changed, the diffracted light of the first grating can always hit the same position of the second grating, and no optical path deviation occurs;

[0014] (3) The utility model can finely adjust the grating spacing through a precision pitch lead screw and a stepper motor with a precise rotation angle, with an adjustment accuracy of micrometers, and can achieve more accurate dispersion compensation;

[0015] (4) The utility model adopts a mechanical microstructure design, which is highly compact and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model.

[0017] In the figure: 1. Base plate; 2. Long working distance polarization-maintaining fiber collimator; 3. Three-dimensional adjustment frame 1; 4. Rotation adjustment frame; 5. Right-angle prism; 6. Polarization beam splitter prism; 7. First sheet grating; 8. Screw hole; 9. Second sheet grating; 10. Slide; 11. Precision lead screw; 12. Stepper motor; 13. Three-dimensional adjustment frame 2. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1 The utility model provides a technical solution: a high-precision new fully automatic electric-controlled dispersion controller, comprising a base plate 1 and a stepping motor 12, a three-dimensional adjustment frame 1 3, a rotating adjustment frame 4, a prism adjustment frame, a first grating adjustment frame, a second grating adjustment frame and a three-dimensional adjustment frame 2 13 are installed on the base plate 1, a long working distance polarization-maintaining fiber collimator 2 is installed on the three-dimensional adjustment frame 1 3, a half-wave plate is installed on the rotating adjustment frame 4, a right-angle prism 5 is installed on the prism adjustment frame, a first grating adjustment frame and a second grating adjustment frame are installed on the three-dimensional adjustment frame 1 The first sheet grating 7 and the second sheet grating 9 are respectively installed on the adjustment frame, and the first sheet grating 7 and the second sheet grating 9 are arranged in parallel, the long working distance polarization-maintaining fiber collimator 2, the half-wave plate, the right-angle prism 5 and the first sheet grating 7 are arranged in sequence, and a polarization beam splitter prism 6 installed on the bottom plate 1 is provided on one side of the right-angle prism 5, and the polarization beam splitter prism 6 is arranged corresponding to the right-angle prism 5, and a right-angle prism pair is installed on the three-dimensional adjustment frame 13, and the right-angle prism pair is arranged corresponding to the second sheet grating 9;

[0020] The stepper motor 12 is installed on one side of the base plate 1 , the output end of the stepper motor 12 is connected to a precision lead screw 11 , and a slide 10 is installed on the precision lead screw 11 , and the second grating adjustment frame and the three-dimensional adjustment frame 13 are both installed on the slide 10 .

[0021] In the present invention, a plurality of screw holes 8 are provided on the bottom plate 1 .

[0022] In the present invention, the three-dimensional adjustment frame 1 3 and the rotation adjustment frame 4 are fixed on the bottom plate 1 through mechanical adapters.

[0023] In the utility model, the prism adjustment frame and the first grating adjustment frame are connected to the bottom plate 1 through screws.

[0024] In the utility model, the polarization beam splitter prism 6 is installed on the bottom plate 1 through the polarization beam splitter prism frame.

[0025] The utility model: a long working distance polarization-maintaining fiber collimator 2 is installed on a three-dimensional adjustment frame 3, which can realize three-dimensional optical path adjustment, thereby realizing the collimation of the optical path. The three-dimensional adjustment frame 3 is fixed to the mechanical base plate through a mechanical adapter; a rotating adjustment frame 4 is used to install a half-wave plate, and the polarization direction of the output light of the long working distance polarization-maintaining fiber collimator 2 is adjusted to S light or P light by rotating the half-wave plate to ensure that the incident light meets the grating specification requirements, and the rotating adjustment frame 4 is fixed to the mechanical base plate through a mechanical adapter; a right-angle prism 5 is installed on the prism adjustment frame to realize the reflection of the optical path after passing through the grating pair, and is connected to the mechanical base plate through screws; the first grating adjustment frame is provided with an angle fine-tuning structure The structure can realize the adjustment of the grating angle, thereby realizing the change of dispersion parameters and the maximization of diffraction efficiency, and is fixed to the mechanical base plate by screws; the second grating adjustment frame is set with an angle parallel to the first grating adjustment frame, and is provided with an angle fine-tuning structure to realize the change of grating dispersion parameters and the maximization of diffraction efficiency; the three-dimensional adjustment frame 13 is used to install the right-angle prism pair, the light beam is diffracted by the second grating to the upper prism surface of the right-angle prism pair, and after being reflected to the lower prism surface, it returns to the second grating along the original light path (with a height difference with the incident light) back to the first grating, and is reflected by the right-angle prism clamped by the prism adjustment frame to the polarization splitter prism clamped by the polarization splitter prism frame for reflection and output.

[0026] The utility model realizes coarse adjustment of the spacing between the first grating and the second grating by changing the screw hole position of the stepping motor installed with the second grating adjustment frame and the three-dimensional adjustment frame 13 on the mechanical base plate. Since the punching direction of the mechanical base plate is strictly arranged according to the diffraction direction of the first grating, it can ensure that the diffracted light beam is incident on the same position of the second grating when the grating spacing is coarsely adjusted. The precision lead screw and slide table of the stepping motor can realize fine adjustment of the grating spacing, and the adjustment range is micron level.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the utility model have been shown and described, it is understandable to those of ordinary skill in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. High-precision new fully automatic electronically controlled dispersion controller, characterized by: The invention comprises a base plate (1) and a stepping motor (12); a three-dimensional adjustment frame (3), a rotation adjustment frame (4), a prism adjustment frame, a first grating adjustment frame, a second grating adjustment frame and a three-dimensional adjustment frame (13) are installed on the base plate (1); a long working distance polarization-maintaining optical fiber collimator (2) is installed on the three-dimensional adjustment frame (3); a half-wave plate is installed on the rotation adjustment frame (4); a right-angle prism (5) is installed on the prism adjustment frame; a first sheet grating (7) and a second sheet grating adjustment frame are installed on the first grating adjustment frame and the second sheet grating adjustment frame, respectively. Two sheet gratings (9), and the first sheet grating (7) and the second sheet grating (9) are arranged in parallel, the long working distance polarization-maintaining fiber collimator (2), the half-wave plate, the right-angle prism (5) and the first sheet grating (7) are arranged in sequence and in correspondence, a polarization beam splitter prism (6) mounted on the bottom plate (1) is provided on one side of the right-angle prism (5), and the polarization beam splitter prism (6) is arranged in correspondence with the right-angle prism (5), and a right-angle prism pair is installed on the second three-dimensional adjustment frame (13), and the right-angle prism pair is arranged in correspondence with the second sheet grating (9); The stepper motor (12) is mounted on one side of the base plate (1), the output end of the stepper motor (12) is connected to a precision lead screw (11), and a slide table (10) is mounted on the precision lead screw (11), and the second grating adjustment frame and the second three-dimensional adjustment frame (13) are both mounted on the slide table (10).

2. The high-precision new fully automatic electronically controlled dispersion controller according to claim 1 is characterized in that: The bottom plate (1) is provided with a plurality of screw holes (8).

3. The high-precision new fully automatic electronically controlled dispersion controller according to claim 1 is characterized in that: The three-dimensional adjustment frame (3) and the rotation adjustment frame (4) are fixed on the base plate (1) via mechanical adapters.

4. The high-precision new fully automatic electronically controlled dispersion controller according to claim 1 is characterized in that: The prism adjustment frame and the first grating adjustment frame are both connected to the base plate (1) via screws.

5. The high-precision new fully automatic electronically controlled dispersion controller according to claim 1 is characterized in that: The polarization beam splitting prism (6) is mounted on the bottom plate (1) via a polarization beam splitting prism frame.

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