CN105826807A - 一种全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器 - Google Patents
一种全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器 Download PDFInfo
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Abstract
本发明涉及螺旋液晶的特定排列的获得以及飞秒激光脉冲能量放大等技术领域,具体而言是一种高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,其特征在于,包括液晶对(1)、1/4波片(2)和线偏振转换器(3),所述1/4波片(2)位于液晶对(1)入光方向,所述线偏振转换器(3)位于液晶对出光方向;所述液晶对(1)包括两块平行设置的液晶(11),所述液晶(11)包括互相平行的两片玻璃或石英(111)组成的液晶盒子和排列于液晶盒子内的螺旋液晶(112),所述螺旋液晶(112)的旋转轴与玻璃或石英(111)所在的平面相互垂直,与玻璃或石英(111)相互接触的螺旋液晶具有平行取向,并且两块液晶(11)相对于入射脉冲其色散性完全相反;所述1/4波片(2)的中心波长位于液晶对色散性相反的位置;所述线偏振转换器(3)是具有将圆偏振光转换为线偏振光能力的光学元件。
Description
技术领域
本发明涉及螺旋液晶的特定排列的获得以及飞秒激光脉冲能量放大等技术领域,具体而言是一种高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器。
背景技术
飞秒脉冲激光振荡器直接输出的平均功率一般只有几毫瓦到几百毫瓦,这么低的功率往往不能满足许多实际的需要。而飞秒激光脉冲由于它极高的峰值功率,不能像连续激光和一般的脉冲激光那样直接放大,因为在放大过程中,高的光强会产生各种非线性效应,影响激光脉冲质量。目前最常用方法是采用啁啾脉冲放大技术(ChirpedPulseAmplification-CPA),首先使用色散元件使脉冲产生一定的啁啾,然后再通过放大器吸取足够的能量,最后激光脉冲再由一个能提供相反色散的压缩器将脉冲压缩到原来的脉宽量级。由此可见,一个啁啾脉冲放大系统应由振荡器、展宽器、放大器和压缩器组成。对于传统的展宽/压缩器,例如光纤,由于色散系数小,要实现高展宽/压缩比,往往体积比较大。而对于光栅对,要实现色散性相匹配则需要非常精细的调节,给操作带来不便。
发明内容
本发明为克服上述现有技术所述的至少一种缺陷(不足),提供一种全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器。
为解决上述技术问题,本发明的技术方案如下:
一种全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,其特征在于,包括液晶对、1/4波片和线偏振转换器,所述1/4波片位于液晶对入光方向,所述线偏振转换器位于液晶对出光方向;
所述液晶对包括两块平行设置的液晶,所述液晶包括互相平行的两片玻璃或石英组成的液晶盒子和排列于液晶盒子内的螺旋液晶,所述螺旋液晶的旋转轴与玻璃或石英所在的平面相互垂直,与玻璃或石英相互接触的螺旋液晶具有平行取向,并且两块液晶相对于入射脉冲其色散性完全相反;
所述1/4波片的中心波长位于液晶对色散性相反的位置;
所述线偏振转换器是具有将圆偏振光转换为线偏振光能力的光学元件。
进一步的,所述螺旋液晶由纯液晶和手性剂构成,其中手性剂和纯液晶的重量比为15-35%。
进一步的,所述玻璃或石英表面设有一层聚合物薄层,所述聚合物薄层形成有凹槽,凹槽的刻线与薄层直接接触的液晶分子长轴平行。
进一步的,组成的液晶盒子的两块玻璃或者石英的间隔不少于100个螺旋周期的长度,液晶的调制深度为0.15-0.35。调制深度指的是光纤光栅折射率调制深度,即液晶中最大折射率与最小折射率之差,单位为1。
与现有技术相比,本发明技术方案的有益效果是:
本发明采用螺旋液晶对,1/4波片以及线偏振光转换器等便于集成的元器件实习脉冲的展宽/压缩,展宽压缩器即液晶对色散性完全对称,极大地简化了啁啾脉冲放大的装置,并且便于调节。极大地提升了该结构和便携式啁啾脉冲放大系统的集成性能,更加便捷的提升飞秒脉冲峰值功率,为通信、微加工、高能物理等研究和生产领域服务。
附图说明
图1为本发明的高集成度飞秒脉冲啁啾脉冲放大展宽/压缩器的装置示意图。
附图仅用于示例性说明,不能理解为对本专利的限制;为了更好说明本实施例,附图某些部件会有省略、放大或缩小,并不代表实际产品的尺寸;对于本领域技术人员来说,附图中某些公知结构及其说明可能省略是可以理解的;相同或相似的标号对应相同或相似的部件;附图中描述位置关系的用语仅用于示例性说明,不能理解为对本专利的限制。
具体实施方式
下面结合附图和实施例对本发明的技术方案做进一步的说明。
实施例1
如图1所示,一种全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,包括液晶对1、1/4波片2和线偏振转换器3,所述1/4波片2位于液晶对1入光方向,所述线偏振转换器3位于液晶对出光方向;所述液晶对1包括两块平行设置的液晶11,所述液晶11包括互相平行的两片玻璃或石英111组成的液晶盒子和排列于液晶盒子内的螺旋液晶112,所述螺旋液晶112的旋转轴与玻璃或石英111所在的平面相互垂直,与玻璃或石英111相互接触的螺旋液晶具有平行取向,并且两块液晶11相对于入射脉冲其色散性完全相反;所述1/4波片2的中心波长位于液晶对色散性相反的位置;所述线偏振转换器3是具有将圆偏振光转换为线偏振光能力的光学元件。
所述螺旋液晶由纯液晶和手性剂构成,其中手性剂和纯液晶的重量比为15-35%。
玻璃或石英表面设有一层聚合物薄层,所述聚合物薄层形成有凹槽,凹槽的刻线与薄层直接接触的液晶分子长轴平行。
组成的液晶盒子的两块玻璃或者石英的间隔不少于100个螺旋周期的长度,液晶的调制深度为0.15-0.35。调制深度指的是光纤光栅折射率调制深度,即液晶中最大折射率与最小折射率之差,单位为1。
中心波长在螺旋液晶对色散性相反位置的线偏振初始脉冲激光在经过1/4波片后,转换成手性和螺旋液晶相同的圆偏振光。根据选择性定则,螺旋液晶只对手性相同的圆偏振光有作用。圆偏振光进入第一块螺旋液晶,脉冲会得到明显展宽(100fs-2.2ps,一般可以达到20到30倍),展宽后的脉冲进入第二块螺旋液晶会得到明显压缩(几乎能够压缩到和初始入射脉冲一样的脉宽)。入射前和出射的脉冲频谱几乎无变化。
显然,本发明的上述实施例仅仅是为清楚地说明本发明所作的举例,而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明权利要求的保护范围之内。
Claims (4)
1.一种全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,其特征在于,包括液晶对(1)、1/4波片(2)和线偏振转换器(3),所述1/4波片(2)位于液晶对(1)入光方向,所述线偏振转换器(3)位于液晶对出光方向;
所述液晶对(1)包括两块平行设置的液晶(11),所述液晶(11)包括互相平行的两片玻璃或石英(111)组成的液晶盒子和排列于液晶盒子内的螺旋液晶(112),所述螺旋液晶(112)的旋转轴与玻璃或石英(111)所在的平面相互垂直,与玻璃或石英(111)相互接触的螺旋液晶具有平行取向,并且两块液晶(11)相对于入射脉冲其色散性完全相反;
所述1/4波片(2)的中心波长位于液晶对色散性相反的位置;
所述线偏振转换器(3)是具有将圆偏振光转换为线偏振光能力的光学元件。
2.根据权利要求1所述的全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,其特征在于,所述螺旋液晶由纯液晶和手性剂构成,其中手性剂和纯液晶的重量比为15-35%。
3.根据权利要求1所述的全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,其特征在于,所述玻璃或石英表面设有一层聚合物薄层,所述聚合物薄层形成有凹槽,凹槽的刻线与薄层直接接触的液晶分子长轴平行。
4.根据权利要求1所述的全波段可调的高度集成飞秒脉冲啁啾脉冲放大展宽/压缩器,其特征在于,组成的液晶盒子的两块玻璃或者石英的间隔不少于100个螺旋周期的长度,液晶的调制深度为0.15-0.35。
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CN112688147A (zh) * | 2020-12-25 | 2021-04-20 | 中国科学院物理研究所 | 预啁啾管理飞秒激光脉冲放大装置和应用 |
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