Changchun Long Ze Precision Optics Co., Ltd.

We present novel designs for aspheric lenses used in   terahertz (THz) imaging . As different surfaces result in different beam shaping properties and in different losses from reflection and absorption, the resultant imaging resolution (i.e. the focal spot size) depends critically on the design approach. We evaluate the different lens designs using Kirchhoff’s scalar diffraction theory, and test the predictions experimentally. We also show that our lenses can achieve sub-wavelength resolution. While our lens designs are tested with THz radiation, the design considerations are applicable also to other regions of the electro-magnetic spectrum.   1. Developments in the terahertz (THz) region Over recent years there have been many  new developments in the terahertz (THz) region . Techniques such as spectroscopy, package inspection, biological investigation etc advanced considerably. Most research is centered around high power emitters, quantum cascade lasers, and improving detection perfor

When it comes to lens design, many people may be confused. But when it comes to the well-known spherical and aspheric lenses, you will be familiar with them. What are the lens designs you know? What are their characteristics? Is it suitable for you?   The main lens designs on the market today are spherical lenses, single aspheric lenses and double aspheric lenses. In the early years,  spherical lenses  accounted for a large proportion of the lens market share. Now aspheric lenses have been recognized by the majority of eyewear consumers, and today we see a much higher prevalence of aspheric lenses than spherical lenses in the lens market. But there are still many consumers who do not have a thorough enough understanding of spherical and aspheric lenses, so today we will once again talk to you in detail about the differences.   What is the spherical lens? A spherical lens is a lens that has a spherical surface on both the inside and outside of the lens, or one side is spherical and the