CPC G02F 1/1339 (2013.01) [G02F 1/1341 (2013.01); G02F 1/133553 (2013.01); G02F 1/216 (2013.01); G02F 1/1337 (2013.01); G02F 1/13439 (2013.01); G02F 1/133354 (2021.01); G02F 2203/055 (2013.01)] | 20 Claims |
1. A wavelength-tunable etalon, comprising:
a pair of substrates, each comprising a reflection layer, an electrode, and an alignment layer on opposing surfaces of the pair of substrates;
a first seal line configured to seal liquid crystal between the pair of substrates; and
a second seal line configured to divide a space in which the liquid crystal is sealed into a main liquid crystal accommodating space configured to pass laser and a sub-liquid crystal accommodating space provided external of the main liquid crystal accommodating space, wherein the second seal line comprises a sub inlet configured to fluidly communicate the main liquid crystal accommodating space with the sub-liquid crystal accommodating space, wherein even though the liquid crystal is injected, residual air or vacuum is located concentratedly at an outermost edge of the sub-liquid crystal accommodating space, and wherein an interval between the first seal line and the second seal line is larger in a space where the residual air or vacuum is located than in another space.
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