Optical system capable of eliminating central bright spot and method for adjusting light divergence angle
An optical system and bright spot technology, which is applied in the field of optics, can solve the problems of the unfavorable influence of special-shaped light fields, the inability to eliminate the zero-order diffraction center bright spot of diffractive optical elements, etc., and achieve low cost, simple and convenient adjustment of light divergence angle, and miniaturized size Effect
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Embodiment 1
[0036] Such as Figure 4 and 5As shown, the illuminating light source 1 is a collimated light illuminating light source, and the diffractive optical structure 2 cooperates with the imaging lens through the diffractive optical element designed as a virtual image. According to the system design requirements, the collimated light illuminating light source is used to realize the special-shaped light field. The diffractive optical structure 2 in the present invention can be designed as a Fresnel diffractive optical element or a Fraunhofer diffractive optical element. The diffractive optical element is irradiated by parallel light, and its light field divergence angle is θ0. Place the refraction optical structure 2 between the illumination light source 1 and the zoom lens structure 3, the distance between the special-shaped light field position 6 realized by the refraction optical structure 2 and the main section position 7 of the zoom lens structure of the imaging system is U1, and...
Embodiment 2
[0038] Such as Figure 4 and 6 As shown, the illuminating light source 1 is a collimated light illuminating light source, and the diffractive optical structure 2 cooperates with the imaging lens through the diffractive optical element designed as a virtual image. According to the system design requirements, the collimated light illuminating light source is used to realize the special-shaped light field. The diffractive optical structure 2 in the present invention can be designed as a Fresnel diffractive optical element or a Fraunhofer diffractive optical element. The diffractive optical element is irradiated by parallel light, and its light field divergence angle is θ0. Place the refraction optical structure 2 between the illumination light source 1 and the zoom lens structure 3, the distance between the special-shaped light field position 6 realized by the refraction optical structure 2 and the main section 7 of the zoom lens structure of the imaging system is U2, and the ima...
Embodiment 3
[0040] Such as Figure 4 and 7 As shown, the illuminating light source 1 is a collimated light illuminating light source, and the diffractive optical structure 2 cooperates with the imaging lens through the diffractive optical element designed as a virtual image. According to the system design requirements, the collimated light illuminating light source is used to realize the special-shaped light field. The diffractive optical structure 2 in the present invention can be designed as a Fresnel diffractive optical element or a Fraunhofer diffractive optical element. The diffractive optical element is irradiated by parallel light, and its light field divergence angle is θ0. Place the refraction optical structure 2 between the illumination light source 1 and the zoom lens structure 3, the distance between the special-shaped light field position 6 realized by the refraction optical structure 2 and the main section position 7 of the zoom lens of the imaging system is U3, and the imag...
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