• 可改变偏振辐射类型
  

Due to unequal phase shifts arising in orthogonally polarized components of an incident wave at total internal reflection Fresnel Rhombs are used to alter polarisation type of radiation. They are designed so that two full internal reflections inside a rhomb provide π/2 phase difference between the orthogonally polarized components of radiation. Hence, if there is 45° angle between the polarization of the linearly polarized incident plane, the emerging beam is circularly polarized, i. e. the rhomb effect is similar to that of a quarter-waveplate. Therefore two identical Fresnel rhombs, installed in series, will provide π/2 phase difference similar to that of a half-waveplate, i. e. the device can rotate the beam polarization plane by 90°, leaving the beam direction invariable.

性能指标

材料	BK7, UVFS
操作光谱范围BK7:	400-2000 nm
操作光谱范围 UVFS:	200-400 nm
表面质量	20-10 scratch & dig
表面平面度	λ/10 @ 633 nm (all polished surfaces)
延迟公差	±2°
宽带AR镀膜	R < 0.5%

目录号	材料	波长范围, nm	延迟	通光孔径, mm	支架直径D, mm	支架长度L, mm
480-0210	BK7	600-900	λ /2	10	70	50
480-0410	BK7	600-900	λ /4	10	70	30
480-0212	BK7	400-700	λ /2	10	70	50
480-0414	BK7	400-700	λ /4	10	70	30
480-1210	UVFS	200-400	λ /2	10	70	50
480-1410	UVFS	200-400	λ /4	10	70	30

如果您需要其他尺寸、参数和镀膜的菲涅尔菱形镜，请联系欧兰

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