CN211698504U - 一种对入射光偏振态不敏感的电可调滤光器 - Google Patents
一种对入射光偏振态不敏感的电可调滤光器 Download PDFInfo
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Abstract
本实用新型公开一种对入射光偏振态不敏感的电可调滤光器,包括第一法布里-珀罗干涉腔和第二法布里-珀罗干涉腔,原理和基本结构相同,均为用电源驱动的液晶盒;第一法布里-珀罗干涉腔包括两片间隔开的玻璃基板,两片玻璃基板相对的两个表面为内表面,相互平行,光线入射方向垂直于内表面,内表面上依次镀有透明电极、宽带高反射率介质膜和液晶定向膜;玻璃基板上的透明电极分别用导线同交流电压源的两级相连,玻璃基板间填充有介电各向异性为正的第一向列相液晶,第一向列相液晶的定向方向平行于两片玻璃基板的内表面。本实用新型的自由光谱范围大,透射光谱半高全宽小,透射波长调节范围大,液晶盒厚度小,响应时间短,结构简单,可靠性高。
Description
技术领域
本实用新型属于光学技术领域,具体涉及滤光器。
背景技术
电可调滤光器是一种重要的光学元件,在光学遥感、高光谱成像、医学成像等方面有广泛应用。液晶、电光晶体等材料常被用于制作电可调滤光器,利用这些材料的电光效应,可以实现滤光器用电调控的特性。由于液晶材料具有较大的双折射,将其用于制作电可调滤光器具有特别的优势,如可以实现较大的调节范围。
然而,传统的基于液晶的电可调滤光器往往只能对入射的非寻常光具有滤光作用,而对于寻常光分量则无能为力,这是由于液晶在外电场的作用下,对于非寻常光的折射率会发生变化,而对于寻常光的折射率则保持不变。传统电可调滤光器的这种对入射光偏振态敏感的特性制约了电可调滤光器的应用。另外,传统的基于液晶的电可调滤光器(如Lyot或Solc型滤光器)还存在透射光谱全高半宽较大,液晶盒厚度较大,响应时间较长等缺陷。
发明内容
针对现有技术的不足,本实用新型的目的是提供一种对入射光偏振态不敏感的电可调滤光器。该滤光器不但对入射光的偏振态不敏感,而且自由光谱范围大,透射光谱半高全宽小,透射波长调节范围大,液晶盒厚度小,响应时间短,结构简单,无机械运动部件,可靠性高。
本实用新型解决其技术问题所采用的技术方案如下:
一种对入射光偏振态不敏感的电可调滤光器,包括第一法布里-珀罗干涉腔和第二法布里-珀罗干涉腔,原理和基本结构相同,均为用电源驱动的液晶盒;
所述的第一法布里-珀罗干涉腔包括两片间隔开的玻璃基板,两片玻璃基板相对的两个表面为内表面,相互平行,光线入射方向垂直于内表面,内表面上依次镀有透明电极、宽带高反射率介质膜和液晶定向膜;两片玻璃基板上的透明电极分别用导线同交流电压源的两级相连,两片玻璃基板间填充有介电各向异性为正的第一向列相液晶,第一向列相液晶的定向方向平行于两片玻璃基板的内表面;
所述的第二法布里-珀罗干涉腔的两片玻璃基板间填充有介电各向异性为正的第二向列相液晶;
所述的第一法布里-珀罗干涉腔的两片玻璃基板的内表面与所述的第二法布里-珀罗干涉腔的两片玻璃基板的内表面相互平行。
所述的宽带高反射率介质膜是一系列分离的、交替的高折射率和低折射率介质膜层,通过调整各膜层的厚度和折射率,可在工作波长范围内实现高反射率。
所述的第一向列相液晶与第二向列相液晶是同一种液晶。
所述的第一向列相液晶的厚度与第二向列相液晶的厚度相等。
所述的第一向列相液晶与第二向列相液晶的定向方向相互垂直。
所述的第一法布里-珀罗干涉腔的透明电极相连的交流电压源的电压信号同与所述的第二法布里-珀罗干涉腔的透明电极相连的交流电压源的电压信号相同。
本实用新型的有益效果:
本实用新型可以实现对入射光偏振态不敏感的可以用电调控的带通滤光器,能透射中心波长λ=2nod/m(m为整数)的窄带光波,且通过改变V的大小,可以控制透射光的中心波长λ。本实用新型的自由光谱范围大,透射光谱半高全宽小,透射波长调节范围大,液晶盒厚度小,响应时间短,结构简单,可靠性高。
附图说明
图1为对入射光偏振态不敏感的电可调滤光器实施例示意图;
图中,第一法布里-珀罗干涉腔1、第二法布里-珀罗干涉腔2、玻璃基板3-1、3-2、3-3、3-4、透明电极4-1、4-2、4-3、4-4、宽带高反射率介质膜5-1、5-2、5-2、5-4、液晶定向膜6-1、6-2、6-3、6-4、交流电压源7、第一向列相液晶8、第二向列相液晶9。
图2为对入射光偏振态不敏感的电可调滤光器实施例的透射光谱;
图中,对入射光偏振态不敏感的电可调滤光器实施例共有12个透光通道,通过控制n不同的取值,可以控制透射光的中心波长。
具体实施方式
下面结合附图和实施例对本发明做进一步阐述。
实施例
如图1所示,一种对入射光偏振态不敏感的电可调滤光器,包括第一法布里-珀罗干涉腔1和第二法布里-珀罗干涉腔2。入射光进入第一法布里-珀罗干涉腔1被第一次滤光,再进入第二法布里-珀罗干涉腔2被第二次滤光。
所述的第一法布里-珀罗干涉腔1和第二法布里-珀罗干涉腔2均是一个可以用电源驱动的液晶盒。
第一法布里-珀罗干涉腔1包括两片以一定距离间隔开的玻璃基板(3-1、3-2),定义两片玻璃基板(3-1、3-2)相对的两个表面为两片玻璃基板的内表面,两片玻璃基板的内表面相互平行,光线入射方向垂直于两片玻璃基板的内表面,两片玻璃基板的内表面上依次镀有透明电极(4-1、4-2)、宽带高反射率介质膜(5-1、5-2)和液晶定向膜(6-1、6-2)。两片玻璃基板(3-1、3-2)上的透明电极(4-1、4-2)分别用导线同交流电压源7的两级相连,两片玻璃基板间填充有介电各向异性为正的第一向列相液晶8,第一向列相液晶8的定向方向平行于两片玻璃基板的内表面。
第二法布里-珀罗干涉腔2包括两片以一定距离间隔开的玻璃基板(3-3、3-4,定义两片玻璃基板(3-3、3-4)相对的两个表面为两片玻璃基板的内表面,两片玻璃基板的内表面相互平行,光线入射方向垂直于两片玻璃基板的内表面,两片玻璃基板的内表面上依次镀有透明电极(4-3、4-4)、宽带高反射率介质膜(5-3、5-4)和液晶定向膜(6-3、6-4),两片玻璃基板的透明电极分别用导线同交流电压源7的两级相连,两片玻璃基板间填充有介电各向异性为正的第二向列相液晶9,第二向列相液晶9的定向方向平行于两片玻璃基板3-3、3-4的内表面。
所述的第一法布里-珀罗干涉腔1的两片玻璃基板(3-1、3-2)的内表面与所述的第二法布里-珀罗干涉腔2的两片玻璃基板(3-3、3-4)的内表面相互平行。
所述的宽带高反射率介质膜(5-1、5-2、5-2、5-4)是一种在宽的波长范围内具有高反射率和低损耗的光学薄膜,可以通过镀多层介质膜实现,定义宽带高反射率介质膜的反射率为R,透射率为T。
定义交流电压源7的电压信号的有效值为V。
所述的第一法布里-珀罗干涉腔1中的第一向列相液晶8与第二法布里-珀罗干涉腔2中的第二向列相液晶9是同一种液晶,定义这种液晶的寻常光的折射率为no,非寻常光的折射率为ne。所述的第一法布里-珀罗干涉腔1中的第一向列相液晶8的定向方向垂直于第二法布里-珀罗干涉腔2中的第二向列相液晶9的定向方向。第一向列相液晶8的厚度与第二向列相液晶9的厚度相等,定义这一厚度为d。定义第一向列相液晶8的指向矢与两片玻璃基板(3-1、3-2)的内表面的法线间的夹角为θ1,第二向列相液晶9的指向矢与两片玻璃基板(3-3、3-4)的内表面的法线间的夹角为θ2。入射至第一法布里-珀罗干涉腔1的非寻常光的等效折射率n1为入射至第二法布里-珀罗干涉腔2的非寻常光的等效折射率n2为由于θ1与θ2大小相等,且均由V的取值决定,故n1与n2大小相等,且均由V的取值决定。定义n1=n2=n,则可以通过改变V的大小控制n的大小。
进入第一法布里-珀罗干涉腔1或进入第二法布里-珀罗干涉腔2的光线,只有波长λ满足2nod/λ为整数的寻常光分量和波长λ满足2nd/为整数的非寻常光分量才可以从第一法布里-珀罗干涉腔1或第二法布里-珀罗干涉腔2透射。由于进入第一法布里-珀罗干涉腔1的光线的寻常光分量对应于进入第二法布里-珀罗干涉腔2的光线的非寻常光分量,进入第一法布里-珀罗干涉腔1的光线的非寻常光分量对应于进入第二法布里-珀罗干涉腔2的光线的寻常光分量,故对于依次进入第一法布里-珀罗干涉腔1和第二法布里-珀罗干涉腔2的任意偏振态的光线,只有当其波长λ同时满足2nod/λ和2nd/均为整数时,该波长的光才可最终从第二法布里-珀罗干涉腔2透射。从而,本实用新型可以实现对入射光偏振态不敏感的可以用电调控的带通滤光器,能透射中心波长λ=2nod/m(m为整数)的窄带光波,且通过改变V的大小,可以控制透射光的中心波长λ。
例如当宽带高反射率介质膜在波长为400nm-700nm的范围内R=0.9,d=0.1,d=3.626μm,no=1.517,ne=1.741时,本实用新型可以实现在400nm-700nm范围内12个通道的窄带滤光。通过改变V的大小,可以控制n在1.517<n≤1.741范围内的取值,从而控制透射光的中心波长。表1列出了12个通道的透射光的透射波长,以及对应的n的取值。图2画出了12个通道的透射光谱,以及对应的n的取值。
表1
通道序号 | 透射光中心波长 | n的取值 |
1 | 407.4nm | 1.5732或1.6293 |
2 | 423.1nm | 1.5754或1.6338 |
3 | 440.0nm | 1.5777或1.6384 |
4 | 458.3nm | 1.5801或1.6433 |
5 | 478.3nm | 1.5831或1.6490 |
6 | 500.0nm | 1.5860或1.6549 |
7 | 523.8nm | 1.5892或1.6614 |
8 | 550.0nm | 1.5929或1.6687 |
9 | 579.0nm | 1.5970或1.6768 |
10 | 611.1nm | 1.6012 |
11 | 647.1nm | 1.6063或1.6956 |
12 | 687.5nm | 1.6118 |
Claims (6)
1.一种对入射光偏振态不敏感的电可调滤光器,其特征在于,包括第一法布里-珀罗干涉腔和第二法布里-珀罗干涉腔,原理和基本结构相同,均为用电源驱动的液晶盒;
所述的第一法布里-珀罗干涉腔包括两片间隔开的玻璃基板,两片玻璃基板相对的两个表面为内表面,相互平行,光线入射方向垂直于内表面,内表面上依次镀有透明电极、宽带高反射率介质膜和液晶定向膜;两片玻璃基板上的透明电极分别用导线同交流电压源的两级相连,两片玻璃基板间填充有介电各向异性为正的第一向列相液晶,第一向列相液晶的定向方向平行于两片玻璃基板的内表面;
所述的第二法布里-珀罗干涉腔的两片玻璃基板间填充有介电各向异性为正的第二向列相液晶;
所述的第一法布里-珀罗干涉腔的两片玻璃基板的内表面与所述的第二法布里-珀罗干涉腔的两片玻璃基板的内表面相互平行。
2.根据权利要求1所述的电可调滤光器,其特征在于,所述的宽带高反射率介质膜是一系列分离的、交替的高折射率和低折射率介质膜层,通过调整各膜层的厚度和折射率,可在工作波长范围内实现高反射率。
3.根据权利要求1所述的电可调滤光器,其特征在于,所述的第一向列相液晶与第二向列相液晶是同一种液晶。
4.根据权利要求1或者3所述的电可调滤光器,其特征在于,所述的第一向列相液晶的厚度与第二向列相液晶的厚度相等。
5.根据权利要求1或者3所述的电可调滤光器,其特征在于,所述的第一向列相液晶与第二向列相液晶的定向方向相互垂直。
6.根据权利要求1所述的电可调滤光器,其特征在于,所述的第一法布里-珀罗干涉腔的透明电极相连的交流电压源的电压信号同与所述的第二法布里-珀罗干涉腔的透明电极相连的交流电压源的电压信号相同。
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