A device and method capable of simultaneously detecting the direction of the optical axes of two birefringent devices

Abstract

The invention discloses a device and method capable of simultaneously detecting the directions of the optical axes of two birefringent devices. The light beam of a light source is received by a photodetector, and the polarization directions of a polarizer and an analyzer are adjusted to be parallel to each other, and a photocurrent value is collected; Put the first birefringent device to be tested into the first turntable, turn the first turntable to find and mark the maximum photocurrent position, collect the photocurrent value, and take down the first birefringent device to be tested; put the second birefringent device to be tested Enter the second turntable, turn the second turntable to find the position with the maximum photocurrent and mark it, and collect the photocurrent value; put the first birefringent device to be tested into the first turntable; turn the first turntable to make the first birefringent device to be tested The marking direction of the second birefringent device to be measured is parallel to each other, and the photocurrent value is collected; the second turntable is rotated to turn the second birefringent device to be measured through an angle of π, and the photocurrent value is collected; according to the collected photocurrent value, mark The directions of the optical axes of the first birefringent device under test and the second birefringent device under test.

Description

technical field [0001] The invention belongs to the field of polarization optical detection, in particular to a device and method capable of simultaneously detecting the directions of the optical axes of two birefringent devices. Background technique [0002] Birefringent devices made of birefringent materials, such as wave plates or phase retarders (or phase compensators), are basic optical components widely used in optical experiments and optical instruments. In principle, any material with birefringence effect can be used to make birefringent devices, such as crystal phase retarders and liquid crystal phase retarders made of birefringent crystals such as quartz, calcite, magnesium fluoride or mica, etc. Retarders, and magnetic liquids, W sheets, etc. under the action of an external magnetic field. [0003] But no matter what kind of material is used, for the convenience of measurement and use, the optical axis (or equivalent optical axis) of the birefringent device is us...

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Problems solved by technology

[0004] Methods for measuring the optical axis direction of birefringent devices include optical heterodyne method, standard plate compensation method, ellipsometry, etc., but the measurement process of the above methods can only measure the optical axis direction of a birefringent device, and most of the measurement process depends on The characteristics of standard film; the price is high and the operation is more complicated

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