Liquid crystal-based optical filtering light path with dynamically adjustable band elimination wavelength and method

• Main Authors: LIU WANYU, LI PING'AN, TANG YI, CHANG YUE'E, CAI DALING
• Format: Patent
• Language: Chinese; English
• Published: 30.04.2021
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

The invention discloses a liquid crystal-based optical filtering light path with dynamically adjustable band elimination wavelength. The light path is composed of a light splitting system, a beam combining system and a filtering assembly. The middle position of the light splitting system and the beam combining system is a focal plane position, the light splitting system and the beam combining system are symmetrical relative to the focal plane, the filtering assembly comprises liquid crystal and a liquid crystal control unit, and the liquid crystal is arranged on the focal plane; the light splitting system is used for dispersing incident light to form a dispersion spectrum and focusing the dispersion spectrum on the liquid crystal; the transmittance change of each pixel of the liquid crystal is controlled by a liquid crystal control unit, so that bandstop filtering with dynamically adjustable optical wavelength is carried out on spectrums at different positions; the beam combining system is used for diverging