FRESNEL ZONE PLATE FOR OPTICAL IMAGE FORMATION USING EXTREME ULTRAVIOLET AND SOFT X RADIATION
FRESNEL ZONE PLATE FOR OPTICAL IMAGE FORMATION USING EXTREME ULTRAVIOLET AND SOFT X RADIATION
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DOI：
10.1364/josa.51.000405
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发表时间：
1961-01-01
影响因子：
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通讯作者：
BAEZ, AV
中科院分区：
文献类型：
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作者：
BAEZ, AV
构造了一种新型菲涅耳带片，可将任意波长的紫外线聚焦到软x射线区。它由一组由径向支柱自我支撑的薄圆形金带组成，留下透明区域。在6700、4358和2537 A的实验测试表明，理论最小角分辨率符合瑞利准则sin0 min =1.22 [lambda]/D。带板的直径为D=0.26 cm，包含19个不透明区域，其中最窄的区域直径约为20 [mu]。带片的分辨率是最优针孔的6倍，速度是最优针孔的40倍。带片产生的图像比用焦距和光圈相似的镜头拍摄的图像要好。在4358 A时，透镜的速度大约是带片的20倍，但在1000 A时，带片的速度要比透镜快得多。考虑在1000a和100a下进行聚焦测试，在这种情况下，传统的成像设备透镜和反射镜可能会失效。2537 A的角分辨率接近理论值1.2X10-4 rad，并保持在至少1.75X10-2 rad的范围内，这是太阳圆盘在地球上所承受角度的2.0倍。在远离地球大气层的轨道卫星上，在软x射线或极紫外线区域工作的带板望远镜现在看来是可能的。
A new type of Fresnel zone plate has been constructed which can focus ultraviolet radiation of any wavelength down to the soft x-ray region. It consists of a set of thin circular gold bands made self supporting by radial struts, leaving the transparent zones empty. Experimental tests at 6700, 4358, and 2537 A showed that the theoretical minimum angular resolution obeys the Rayleigh criterion, sin0 min =1.22 [lambda]/D. The diameter of the zone plate is D=0.26 cm and contains 19 opaque zones, the narrowest of which measured about 20 [mu] across. The zone plate was better than the optimum pinhole in resolution by a factor of about 6 and in speed by a factor of 40. The zone plate produced pictures that compared favorably with those made with a lens of similar focal length and aperture. The lens was about 20 times faster than the zone plate at 4358 A, but at 1000 A the zone plate would have been far faster than the lens. Focusing tests are contemplated at 1000 A and at 100 A where lenses and mirrors, the conventional image-forming devices, may fail. The angular resolution at 2537 A was close to the theoretical value of 1.2X10-4 rad and held over a field of at least 1.75X10-2 rad, which is 2.0 times the angle subtended by the sun''s disk at the earth. A zone plate telescope, operating in the soft x-ray or extreme ultraviolet region, far above the earth''s atmosphere in an orbiting satellite, now seems possible.