非偏振分光棱镜(NPBS)也称为NPBS立体分光镜，是一种更复杂的类型，由两个直角棱镜组成，它们在斜边面处被固定一起。一个棱镜的胶合面有镀膜，在胶合之前，镀有所需反射性能的金属介质膜，具有特定的反射百分比和颜色。镀膜吸收损耗最小，透过率与反射率可设为10%、20%、30%、40%、50%等。

偏振分光棱镜由两个直角棱镜胶合而成，其中一个棱镜的斜面镀有偏振介质膜。当与正常入射、非偏振光一起使用时，入射光被分成两束偏振光，P偏振光可直接穿过，S偏振光以90°角反射出来。

激光透镜用于在各种激光应用中聚焦来自激光束的准直光。激光透镜包括一系列透镜类型，包括平凸透镜，激光划线透镜或激光发生器透镜。 激光头设计用于根据透镜类型以几种不同的方式聚焦光线，例如聚焦到一个点，一条线或一个环。许多不同的镜头类型可用于各种波长。

1.  Germanium (Ge)

Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 μm wavelength band. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.

2. Silicon (Si) 

Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns.To avoid this, material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 ohm cm) for best transmission above 10 microns, and doping is usually boron (P-type) and phosphorus (N-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.
 
CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5-8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5 - 8 um region; Mirror for CO2 laser and spectrometer applications.
 

ZnS MultiSpectral Under intense heat and pressure, defects within the crystalline lattice are virtually eliminated, leaving a water-clear material with minimal scatter and high transmission characteristics from 0.4 to 12 microns. This material is particularly well suited for high-performance common aperture systems that must perform across a broad wavelength spectrum.

Specifications:

Material: ZnS MultiSpectral
Diameter Tolerance: --------------------- +0.0, -0.1mm
Thickness Tolerance: -------------------- ±0.1mm
Clear Aperture: ---------------------------->85%
Parallelism: -----------------------------------3 arc minute
Surface Quality: ----------------------------80-50 scratch and dig
Wavefront Distortion: -------------------- λ /2 per 25mm @633mm
Bevel: -----------------------------------------Protective  (<0.2mm x 45° )
Coating: -------------------------------------- Optional （Uncoated, AR Coating, etc.）

4. ZnSe material

ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it’s critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry. Our quality assurance department provides testing and specific optics certification on request.

ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It’s safe to use in most industrial field, and laboratory environments.

1，优恩立光电提供哪些金属镀膜类型？

优恩立光电主要提供四种镀膜类型，包括：

1）紫外增强铝膜：从250nm到400nm的平均反射率> 85%

2）保护性铝膜：从400nm到800nm的平均反射率> 87%

3）保护性银膜：从400nm到20um的平均反射率> 400%

4）保护性金膜：从650nm到16um的平均反射率> 98%

2，金属镀膜反射镜具有什么特点？

金属涂层镜具有以下特征：

光谱范围广

对入射角和偏振态不敏感

低成本

非耐用品

反射率相对较低

激光损伤阈值低

3，优恩立光电能为您提供什么金属镀膜反射镜？

常用规格：

基底材料：N-BK7，熔融石英，耐热玻璃，浮法玻璃

尺寸公差：+/- 0.1mm

表面质量：60-40

平行度：3'

平整度：λ/ 4 / 25mm @ 633nm

倒角：保护性

一个表面：抛光和金属镀膜

另一个表面：细磨

注：铝是最广泛使用的金属反射膜，从近紫外到近红外，具有高反射率，且成本低。银在可见光和近红外波长下的反射率高于铝膜，但空气中的银会快速氧化，颜色变暗，使薄膜性能和硬度迅速下降。金膜具有良好的一致性，在近、中、远红外范围内具有高反射率，可以有效控制热辐射，但它比较柔软，容易擦伤，应该非常注意清洁，而且成本很高。