摘要:
An oriented photopolymer is a polymer where photomodification is initiated by irradiation with plane-polarized light and where the molecular configuration has a preferred orientation as a result of linear polarization. These polymers have optically anisotropic and other novel properties.
摘要:
An apparatus for the isotropic irradiation of cavity walls includes in a first channel of a catheter a light conducting fiber which has a cortically shaped tip for deflecting a light beam radially outwardly through a transparent portion of the catheter and a resiliently expandable sleeve tightly disposed around the catheter and having its interior in communication by a second channel with a fluid supply for expanding the sleeve so as form a light scattering structure whose scattering characteristics are adjustable dependent on the degree of sleeve expansion.
摘要:
An optical frequency conversion element has a wave-guiding layer which consists of a .chi..sup.(2) -active ferroelectric liquid crystal. The monomeric or polymeric liquid crystal material has a periodic structure which permits the so-called quasi phase matching of a guided laser beam. The period length of the structure is equal to twice the coherence length l.sub.c =.pi./.DELTA..beta. of the material, whereby .DELTA..beta.=.beta..sub.o (2.omega.)-2.beta..sub.o (.omega.), with .omega.=angular frequency of the fundamental wave, 0=zero-order mode and .beta.=propagation constant of the mode.
摘要翻译:光变换元件具有由chi(2)活性铁电液晶构成的波导层。 单体或聚合物液晶材料具有允许引导的激光束的所谓的准相位匹配的周期性结构。 结构的周期长度等于材料的相干长度lc = pi / DELTAβ的两倍,其中ΔTA=ω(2ω)-2βo(ω),ω=基波的角频率 ,0 =零阶模式,β=模式的传播常数。
摘要:
The polarizer comprises a layer of cholesteric liquid crystal with Grandjean structure disposed in the path of the light and in which the light in a given wavelength range is reflected with selective and circular polarization or is transmitted with reversed direction of rotation, and a mirror which reversed the direction of rotation of the circular-polarized light. The component reflected by the mirror is also transmitted. If the liquid crystal layer is concentric with the source of natural light and the mirror is spherical, the result is a source of circular polarized light. A projection system is obtained by a combination of two of the aforementioned polarizers, one serving as a polarizer and one as an analyzer, and an interposed liquid crystal display cell for modulating the intensity of the polarized light.
摘要:
A medical instrument consists of a relatively rigid shaft (1) and a flexible tip (3) that is attached to one end of the shaft (1) as an extension thereof. Fastened to its outer end at points opposite each other are tension cables (5, 6), which are guided in a tubular sheath parallel to the tip (3) and to the shaft (1) to its other end, and at the other end of the shaft are joined to an adjusting wheel (8) that allows shortening of one and equal lengthening of the other of the two oppositely located tension cables (5, 6) in order to impart to the tip (3) a selectable curvature in the direction of the shortened tension cable. The invention has as its object a simplification of known instruments which simultaneously allows a reduction in dimensions. According to the invention the shaft (1) and the tip (3) consist of extruded plastic parts that are provided with conduits, located just under their surface, to accommodate the tension cables (5, 6) which are firmly joined to the tip (3), and the plastic parts are adhesively butt-bonded together at the transition (10) from shaft (1) to tip (3).
摘要:
Disclosed is a cleaning device, having a cleaning roller and a scraper, which are capable of being brought into and out of contact with the photoconductive peripheral surface of a drum of a copier. The scraper further comprises a strip which is of a geometry such that in combination with the operation of the roller and scraper it allows for complete and efficient removal of the cleaning liquid from the drum surface without overflow and damage to the copier sub-assembly.