公开(公告)号：US5615289A

公开(公告)日：1997-03-25

申请号：US568650

申请日：1995-12-07

申请人： Gary S. Duck ,  David H. Cushing ,  Stephen J. Mihailov

发明人： Gary S. Duck ,  David H. Cushing ,  Stephen J. Mihailov

IPC分类号： G02B27/46 ,  G02B6/12 ,  G02B6/34 ,  G02B6/28

CPC分类号： G02B6/29356 ,  G02B6/02052 ,  G02B2006/12107 ,  G02B2006/12109

摘要： A bandpass optical filter is provided that is formed within an optical fiber in the form of a Bragg grating. The grating includes multiple Fabry Perot cavities disposed along the waveguide. Each of the cavities includes a pair of reflectors. Each reflector comprises alternating high-low index regions within the waveguide, each region having a thickness of one quarter-wave at a bandpass wavelength, each alternate region being of a different index of refraction than an adjacent region. A multiple odd quarter-wave or quarter-wave high or low index region is sandwiched between each pair of reflectors. The number of high/low regions within a reflector is selected in accordance with the refractive index difference between two alternate adjacent regions.

摘要翻译： 提供一种形成在布拉格光栅形式的光纤内的带通滤光器。 光栅包括沿着波导设置的多个Fabry P + E，acu e + EE r + E，cir o + EE t空腔。 每个空腔包括一对反射器。 每个反射器包括波导内的交替的高 - 低折射率区域，每个区域在带通波长处具有四分之一波长的厚度，每个替代区域具有与相邻区域不同的折射率。 多个奇数四分之一波或四分之一波高或低折射率区域夹在每对反射器之间。 根据两个交替相邻区域之间的折射率差来选择反射器内的高/低区域的数量。

公开(公告)号：US4960310A

公开(公告)日：1990-10-02

申请号：US389545

申请日：1989-08-04

申请人： David H. Cushing

发明人： David H. Cushing

IPC分类号： G02B5/28

CPC分类号： G02B5/28

摘要： A broad band low reflectance neutral density optical filter. A neutral density filter having substantially flat transmittance and low reflectivity over a wide range of wavelengths from the ultraviolet through the visible region of the spectrum includes a transparent substrate, two successive layers of different dielectric materials on the substrate, at least two layers of metallic material, each metallic layer being separated from the preceding metallic layer by a layer of dielectric material, and finally, two succeeding layers of different dielectric mateials. The resultant neutral density filter thus has two layers of different dielectric materials between the substrate and the first layer of metallic material, and two layers of different dielectric materials between the atmosphere and the final layer of metallic material. This construction provides physical and spectral stability, relatively constant transmittance as a function of wavelength, and low reflectivity from both sides of the filter as a function of wavelength, which in turn permits a number of filters of the invention to be employed in series.

摘要翻译： 宽带低反射中性密度滤光片。 在从紫外到光谱的可见光区域的宽波长范围内具有基本平坦的透射率和低反射率的中性密度滤光片包括透明基片，基片上两层连续的不同介电材料层，至少两层金属材料 ，每个金属层通过介电材料层与前一金属层分离，最后是两个不同介电材料的后续层。 所得到的中性密度滤光器因此在基底和第一金属材料层之间具有两层不同的介电材料，以及两层不同的电介质材料，在大气层和金属材料的最终层之间。 这种结构提供物理和光谱稳定性，作为波长的函数的相对恒定的透射率，以及作为波长的函数的滤光器两侧的低反射率，其又允许串联使用本发明的多个滤光器。