Analysis of the diffraction characters of the Gaussian beams restricted by a rectangular aperture
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Fujian Provincial Key Laboratory of Photonic Technology, Institute of Laser & Optoelectronics Technology, Fujian Normal University, Fuzhou 350007, China
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Corresponding author:
GUO Fu-yuan, guofy@fjnu.edu.cn
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Received Date:
2008-08-26
Accepted Date:
2009-07-15
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Abstract
Based on the expression of diffractive field distribution of the Gaussian beams restricted by a rectangular aperture and focalized by a lens, the relationship between the width of the rectangular aperture and the spot size of the restricted beam, as well as the relationship between the aperture width and the power in the bucket,was numerically calculated with MATLAB. It was illuminated that the width of the centre bright fringe decreased along with the increasing width of the rectangular aperture when the effect of the aperture on the beam couldn't be ignored, however, the width of centre bright fringe step changed with increase of the size of the aperture when the effect could be ignorable, the width of the half maximum intensity of the centre bright fringe decreased along with the accretion of the width of the aperture and then it tends to a constant. The piecewise function of the relationship between the full width at half maximum(FWHM) of the centre bright fringe and the rectangular aperture width was put forward as well. The conclusions are useful for the design of a laser facility.
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References
|
[1]
|
ZHAO J,MA Z,LIN N,et al.Novel adaptive laser scanning sensor for reverse engineering measurement[J].Chinese Journal of Scientific Instrument,2007,28(7):1164-1169. |
|
[2]
|
WANG L Q,LU Z K,NI X X.Cross-talk correction in dual-labeled fluorescent microarray scanning[J].Chinese Optics Letters,2004,2(3):162-164. |
|
[3]
|
DUAN K L,LÜB D.Vectorial nonparixial propagation equation of elliptical Gaussian beams in the presence of a rectangular aperture[J].J O S A,2004,A21(9):1610-1620. |
|
[4]
|
FU W Y,LIU Z Q.Diffraction of Gaussian beam by a rectangular aperture[J].College Physics,2005,24(8):34-37(in Chinese). |
|
[5]
|
CAI X B.Diffraction of Gaussian beams by a rectangular aperture and a circular aperture in an opaque screen[J].Journal of Nanjing Institute of Posts Telecommunications,1995,15(3):102-108(in Chinese). |
|
[6]
|
WANG W Y,TAN J C.Propagation of Gaussian beam in the optical system with aperture stop[J].College Physics,2004,23(7):32-34(in Chinese). |
|
[7]
|
CORBETT B,KEARNEY I,LAMBKIN P,et al.Engineering of InGaAsP layer structures for low divergent long wavelength lasers[J].Electron Lett,2002,38(11):515-516. |
|
[8]
|
LÜB D.Laser optics-beam characterization,propagation and transformation,resonator technology and physics[M].Beijing:Higher Education Press,2003:119-122(in Chinese). |
|
[9]
|
WANG M Z,DUAN L K,LÜB D.Validity of the Fresnel approximation for hard-edged diffracted beams[J].Laser Technology,2004,28(6):670-672(in Chinese). |
|
[10]
|
GOODMAN W J.Introduction to fourier optics[M].New York:Mcgraw-Hill,1988:96-97. |
|
[11]
|
GAO R,GUO F Y,LI L H,et al.Study on diffraction effects of laser beam and its influences on resolving power of scanning system[J].Acta Optica Sinica,2009,38(1):199-204(in Chinese). |
|
[12]
|
SIEGMAN A E.How to (maybe) measure laser beam quality[C]//OSA Trends in Optics and Photonics Series.New York:Optical Sociaty of America,1998:184-199. |
|
[13]
|
SHANGGUAN C M S,GUO F Y,LU Y.Characteristic of far field diffraction of TE0 Mode in planar waveguide[J].Journal of Optoelectronics·Laser,2004,15(3):299-302(in Chinese). |
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