The ratio choice method of the pinhole aperture to the waist of the Gaussian laser in the fabrication of holographic gratings

	The ratio choice method of the pinhole aperture to the waist of the Gaussian laser in the fabrication of holographic gratings
其他题名	论文其他题名
	Han J.; Bayanheshig; Li W. H.
	2012
发表期刊	Acta Physica Sinica
ISSN	1000-3290
卷号	61 期号:8
摘要	In the fabrication of the holographic diffraction gratings, the scatter light which is produced by the reflection of the granule in air or the diffraction defect of the optical apparatus will be recorded simultaneously in the resist. Those noises not only reduce the diffraction efficiency of gratings, but also give rise to the scattered light in diffraction. So an appropriate spatial filter should be used to stop the higher spatial frequencies corresponding to the Gaussian beam. Because the diffraction effect after the pinhole aperture can demolish the wavefronts of laser, it is the most important to choose the optimal pinhole for adjusting the waist of the laser. On the basis of standard scalar diffraction theory, the field amplitude is given by the convolution calculation, the phase distortion of diffraction wavefronts is also analyzed, and the lower limit ratio of the aperture size with respect to the beam radius is given when the phase transitions are further away from the center. Using the energy conservation of Gaussian beam and comparing the characteristics change of diffraction beam, the effect of diffraction is presented and the upper limit ratio of the spatial filter is given by the critical condition of the diffraction. The conclusion shows that if the ratio of the aperture radius to beam waist is between 1.52 < a/w(0) < 2.2, the phase is invariable in the area of the exposal, and the power transmitting the spatial-filter pinhole aperture is slightly more than 99%, so spatial filter performs its function only in this range of the radio.
收录类别	SCI
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/25539
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Han J.,Bayanheshig,Li W. H.. The ratio choice method of the pinhole aperture to the waist of the Gaussian laser in the fabrication of holographic gratings[J]. Acta Physica Sinica,2012,61(8).
APA	Han J.,Bayanheshig,&Li W. H..(2012).The ratio choice method of the pinhole aperture to the waist of the Gaussian laser in the fabrication of holographic gratings.Acta Physica Sinica,61(8).
MLA	Han J.,et al."The ratio choice method of the pinhole aperture to the waist of the Gaussian laser in the fabrication of holographic gratings".Acta Physica Sinica 61.8(2012).

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