Zoom optical system for collecting weak optical signals

Abstract

The invention discloses a zoom optical system for collecting weak optical signals. The system consists of thirteen lenses with focal lengths being positive, negative, positive, positive, negative, positive, negative, negative, positive, positive, negative, positive and positive in sequence from an object plane. The system is mainly used for effectively coupling a weak optical signal into an optical fiber, thereby facilitating data acquisition of a rear-end CCD. For an actual application scene, the system is designed as a zoom system, and the object distance ranges from 50 mm to 200 mm. In order to improve the optical fiber coupling efficiency, parameters of image points on the axis of the optical system are accurately designed, the root-mean-square diameter of the image points ranges from100 micrometers to 150 micrometers, and the divergence angle 2alpha of the image points on the axis is 30.6 degrees. Not only can optical fibers be effectively coupled, but also single-optical-fiber coupling or multi-optical-fiber-bundle coupling can be satisfied for different application scenes. The working waveband of the system covers visible light and part of near-infrared light wavebands, andvarious 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

Images