A zoom optical system for weak optical signal collection

Abstract

The invention discloses a zoom optical system for collecting weak light signals. Starting from the object plane, the system is composed of thirteen lenses with focal lengths of plus-minus-positive-negative-positive-negative-positive-positive-negative-positive-positive-negative-positive-positive-positive. The system is mainly used to effectively couple the weak optical signal into the optical fiber, which is convenient for the back-end CCD to collect data. For practical application scenarios, the system is designed as a zoom system with an object distance ranging from 50 to 200 mm. In order to improve the fiber coupling efficiency, the on-axis image point parameters of the optical system are precisely designed, the root mean square diameter of the image point is 100 microns to 150 microns, and the on-axis image point divergence angle 2α is 30.6 degrees. Not only can it be effectively coupled into optical fibers, but it can also meet the needs of single fiber coupling or multi-fiber bundle coupling for different application scenarios. The working band of the system covers visible light and some near-infrared light bands, and various aberrations are well corrected.

Description

technical field [0001] The invention relates to a zoom optical system for collecting weak light signals, which belongs to the field of interaction between light and matter and optical detection. Background technique [0002] With the generation of laser and the development of a series of optical detection technologies, the collection and detection of weak light signals has become more and more important. For example, fluorescence spectrum detection technology, laser-induced plasma technology, etc. all need to collect and analyze weak optical signals. Fluorescence is a kind of radiative transition, which is the radiation released when a substance is de-excited from an excited state to a ground state. The fluorescence analysis method is widely used, and has high sensitivity, the detection limit is 2 to 4 orders of magnitude lower than that of the absorption photometry, the selectivity is strong, the result is accurate, and the sample needs to be used less. Fluorescence spect...

AI Technical Summary

Problems solved by technology

At present, many coupling lenses have low coupling efficiency, cannot gather the most light well, and provide higher incident energy.

And the focusing effect, such as spot diameter, divergence angle of converging light, dispersion and other parameters are not very ideal

Bring more difficulties to scientific research and practical application

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