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光学像差详解：色差、场曲、畸变与散光

本文详细介绍了光学像差的种类，包括色差、场曲、畸变和散光，解释了它们的形成原理、对图像质量的影响，以及常用的校正方法，适合光学设计和摄影爱好者参考。

Harmonic Generation

This article explained what is harmonic generation (or frequency conversion), which is the result of the utilization of nonlinear optical effects, and other contents including type I, type II phase matching.

The Prospect and Advantages of Infrared Germanium(Ge) Optics

This article discussed the material properties of single-crystal germanium (Ge) and the prospect of infrared germanium optics(germanium windows, germanium lens, germanium domes) through stating and evaluating the advantages and drawbacks of Ge optics.

光学晶体双折射偏振片分类

光学偏振片是一种光学元件，它能够筛选光线并根据光的偏振状态将光分成两个特定比例的光束。最常见的光学偏振片之一是晶体偏振片，它利用各向异性晶体的双折射特性。

锗窗口（Germanium Windows）

我们的主题是 锗窗口（Germanium Windows）。但首先，让我们对“锗”这种材料有一个总体了解。 单晶锗（Single Crystal Germanium）指的是没有大角度晶界和双晶结构的锗晶体，它具有金刚石结构，是一种用途广泛的材料， 在半导体、光纤通信、航空航天、太阳能电池和红外光学等领域展现出巨大的潜力。 最新数据显示，在未来的锗需求增长中，红外光学领域将占据最大的份额， 这主要归因于国防和民用领域对红外技术需求的爆发性增长。

Lens Selection Guide

This article enumerated the different lens classifications including plano-convex lens, plano-concave lens, double-convex lens, double-concave lens, meniscus lens, ball/half-ball lens, achromatic doublet lens, cylindrical plano-convex lens/plano-concave lens, rod lens, and aspheric lens, exploring their characteristics, and the appropriate context to use them.

BBO晶体（β-硼酸钡晶体）的应用

本文介绍了BBO晶体（β-硼酸钡晶体）的应用，包括光学非线性频率转换（谐波生成以及光学参数放大器/振荡器 OPA/OPO）、电光调制（EOM）以及自发参量下转换（SPDC）。

Spherical Lenses vs. Aspheric Lenses

This article is a comprehensive comparison between spherical lenses and aspheric lenses, where the advantages of both lens categories are listed and evaluated.

Optical Filters

The article describes the characteristics of different types of optical filters including absorptive filters, interference filters, polarization filters, bandpass filters, notched filters, dichroic filters, neutral density filters, laser line filters, explained their working principle, and stated the common applications of optical filters.

Scintillation Screens for X-ray Imaging

This article describes the working principle of scintillators, what exactly a scintillation screen is, their vital role in X-ray imaging, and the various scintillation materials employed in these screens.
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