Laser illumination optical system combining diffraction optical element with laser

Abstract

The invention belongs to the field of photoelectric communication, and especially relates to a laser illumination optical system combining a diffraction optical element with a laser. The laser illumination optical system comprises a laser irradiation light source and the diffraction optical element. After the laser irradiation light source is irradiated on the diffraction optical element, the optical field of the laser irradiation light source is optically modulated by the diffraction optical element, the laser optical field is spread along a specific angle area, and through design and adjustment of optical field wavefront phase modulation, micro morphology and overall dimension of the diffraction optical element, a divergence angle of a needed complex illumination optical field is designed. According to the invention, through diffraction optical design and optical modulation of optical field parameters of the laser irradiation light source are realized through the diffraction optical element, the light intensity utilization rate is high, the distribution shape of the optical field and the light intensity distribution can be flexibly controlled, and the complex illumination optical field can be realized according to needs of such application systems as monitoring shooting, human-eye observation and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronic communication, and in particular relates to a laser illumination optical system which adopts a diffraction optical element combined with a laser. Background technique [0002] The optical design of the traditional lighting light field is based on the characteristics of light-emitting sources (such as LEDs, lasers, etc.), through the use of refractive optical components, such as lenses, mirrors, microlens arrays, lenses, astigmatism sheets, spatial light modulators (such as mask, liquid crystal screen, etc.), to realize the secondary modulation of the luminous light field, and to realize the output of the required lighting light field. The traditional design method is to modulate the incident light field by means of refraction, occlusion, and imaging. The design method has complex optical elements, a large number, very low light utilization efficiency, and single function, which cannot realize complex...

AI Technical Summary

Problems solved by technology

The traditional design method is to modulate the incident light field by means of refraction, occlusion, and imaging. The design method has complex optical elements, a large number, very low light utilization efficiency, and single function, which cannot realize complex lighting light fields. For example, traditional design methods cannot realize widely used light intensity distribution asymmetry correction and long-distance lighting above 1000 meters.

At the same time, the traditional lighting light field design method has large optical devices, high cost, and high requirements for the application environment. Fine dust on the surface of the optical device will cause serious defects in the special-shaped light field. The above factors have caused many problems for the use of this product. Unfavorable factors seriously limit the market application of the product

[0003] In modern technology, with the application and development of optoelectronic equipment and systems, the application of active light source lighting fields in various optoelectronic product fields is becoming more and more extensive, and the requirements are also constantly improving, such as night vision monitoring equipment, industrial lighting equipment, ultra-wide-angle The development of shooting equipment, ultra-long-distance shooting equipment and other fields has put forward complex and stringent requirements for the active lighting light field. The traditional lighting optical system has a complex optical system, large size, high cost, and complicated adjustment. The movement and joint adjustment of multiple lenses, and the light field control method is simple, and complex and variable light field distribution cannot be realized, which can no longer meet the needs of the application field. Based on the development of diffractive optics and laser technology, it has been used to realize special lighting laser light The field provides the technical basis. The diffractive optical element is a new type of optical element that has only gradually matured recently. Its design principle is essentially different from the traditional refractive optics. It is based on the wavefront phase characteristics of the light field for light field modulation design, which belongs to the wavelength level. Nano-micro-optical devices can realize hundreds of millions of light field control units in the light field area of ​​1 mm in size, and can make rich and flexible adjustments to the input light field, and can almost achieve any complex output light field requirements , which is small in size, powerful in function, and highly efficient in light intensity utilization, is an important application technology in the field of lighting in the future

Images