Opt Lett. 2018 Jul 15;43(14):3277-3280. doi: 10.1364/OL.43.003277.
We present a universal design and proof-of-concept of a tunable linear retarder of uniform wavelength response in a broad spectral range. It consists of two half-wave retarders (HWR) between two quarter-wave retarders (QWRs), where the uniform retardance can be tuned continuously by simply rotating one of the HWRs. A proof-of-concept of this design is built by using commercially available Fresnel rhomb retarders that provide retardation with almost wavelength uniformity in the visible and near infrared from 450 to 1550 nm. The design is universal, since other achromatic QWRs and HWRs could also be employed. The system is experimentally demonstrated to control the state of polarization of a supercontinuum laser.
我们提出了一种在宽光谱范围内具有均匀波长响应的可调谐线性延迟器的通用设计和概念验证。它由两个 quarter-wave retarders (QWR) 之间的两个 half-wave retarders (HWR) 组成，通过简单地旋转其中一个 HWR，均匀延迟可以连续调节。该设计的概念验证是通过使用商用菲涅尔菱形延迟器构建的，该延迟器在可见和近红外光谱中从 450nm 到 1550nm 提供几乎波长均匀的延迟。该设计是通用的，因为也可以使用其他消色差 QWR 和 HWR。该系统已通过实验证明可用于控制超连续激光的偏振状态。
