Preparation method of high-speed electric control holographic crystal diffraction beam splitter
A technology of electronically controlled holography and crystal diffraction, which is applied in the direction of instruments, nonlinear optics, optics, etc., can solve the problems of the response speed of electronically controlled beam splitting and the inability to control the splitting switch in real time, etc.
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specific Embodiment approach 1
[0020] Embodiment 1: The high-speed electronically controlled holographic crystal diffraction beam splitter of this embodiment is composed of a paraelectric phase electronically controlled holographic crystal. The crystal has two light-transmitting surfaces, and the two light-transmitting surfaces are perpendicular to the The [100] axis of the crystal, one of the light-passing surfaces is used as the light input end, and the other light-passing surface is used as the light output end. The crystal is engraved with a grating, and the groove spacing of the grating satisfies the Raman-Nath diffraction condition. The wave vector direction is parallel to the [001] axis of the crystal, and the grating plane is perpendicular to the [100] axis of the crystal.
[0021] Wherein, the Raman-Nath diffraction condition, that is, the Q value is less than 1, and the expression of the Q value is: Q=2πλL / nΛ 2 . Among them, λ is the wavelength of the incident light, n is the refractive index, L ...
specific Embodiment approach 2
[0031] Specific implementation mode two: combination figure 1 and figure 2 Describe this embodiment, the preparation method of the high-speed electronically controlled holographic crystal diffraction beam splitter of this embodiment, its process is as follows:
[0032]Step A1, apply a direct current electric field between the two ends of the [001] axis direction of the paraelectric phase electronically controlled holographic crystal (that is, one electrode of the direct current electric field is connected to one end of the crystal in the [001] axis direction, and the other electrode of the direct current electric field connected to the other end of the crystal in the direction of the [001] axis), and the field strength of the DC electric field is E W ,E W ≠0;
[0033] Step A2, making two coherent beams incident on the light input end of the crystal, and making the two coherent beams intersect in the crystal, and the angle θ between the two coherent beams satisfies the Rama...
specific Embodiment approach 3
[0042] Specific embodiment three: the beam splitting method based on the high-speed electronically controlled holographic crystal diffraction beam splitter of this embodiment, its process is as follows:
[0043] Step B1. Place the high-speed electronically controlled holographic crystal diffraction beam splitter in the optical path to be split, so that the beam to be split is incident on the light input end of the beam splitter. At this time, the light output of the beam splitter output a bunch of outgoing beams;
[0044] Step B2, applying an electric field between the two ends of the [001] axis direction of the beam splitter, the field strength of the electric field is E 0 , and E 0 ≠0, the light output end of the beam splitter outputs N beams, N is a positive integer greater than 2, and the size of N is determined by E 0 Decide;
[0045] Wherein, the applied electric field in step B2 can be a DC electric field or an AC electric field.
[0046] This embodiment can realize...
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Abstract
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