Method and device for acquiring Bessel beam based on cross phase modulation
A cross-phase modulation and Bessel beam technology, applied in the field of nonlinear optics, can solve the problems of high price, large optical distortion, and irreconcilable central bright spots, etc., and achieve the effect of reducing operation difficulty, simple experimental equipment, and simple realization
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[0047] Example 1:
[0048] Prepare the following test devices:
[0049] There are 2 lasers, the continuous tunable ring Ti:Sapphire laser (Matisse TR) emits the light as the modulated laser beam; the external cavity semiconductor laser emits the light as the modulated laser beam.
[0050] 1 convex lens, focal length 500mm.
[0051] Two half-wave plates.
[0052] 2 polarization beam splitting cubes.
[0053] Non-linear medium, rubidium (Rb) atomic pool.
[0054] CCD, used for imaging.
[0055] Such as figure 1 As shown, the specific steps for obtaining a hollow beam using the method of the present invention are as follows:
[0056] Step 1. Focus the modulated laser beam 8 emitted by a tunable ring Ti:Sapphire (Matisse TR) laser with a convex lens 1 to obtain a Gaussian beam with a waist spot size of 172 μm, and set the waist spot position as the coordinate origin; the lens transformed The Gaussian beam passes through the first half-wave plate 2 and the first polarization beam splitting cube...
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