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Speckle contrast in laser scanning display system with circular and rectangular laser spot on screen was calculated. For scanning with circular laser spot, the speckle contrast reduces with the decrease of the diameter of laser spot when the diameter of the laser spot is lager than the correlation length of the screen. When the laser spot is about the same size of the correlation length of the screen, the speckle contrast becomes higher owing to the non-Gaussian speckle effect. If we continue to reduce the size of laser spot, because of the specular reflection the speckle contrast decreases quickly. To ensure enough scattering elements in laser spot, the laser spot is just narrowed in one direction. If the laser spot is narrowed in the scanning direction, the speckle contrast is reduced due to the reducing temporal correlation of speckle, while if the laser spot is narrowed in the other direction, speckle contrast changes slightly. For the circular laser spot, some experimental results are given.
[1] Shin S C, Yoo S S, Lee S Y, Park C Y, Park S Y, Kwon J W, Lee S G 2006 Displays 27 91
[2] Goodman J W 1975 Laser Speckle and Related Phenomena (Heidelberg: Springer) p9
[3] Wang L L, Tschudi T, Halldórsson T, Pétursson P R 1998 Appl. Opt. 37 1770
[4] Iwai T, Asakura T 1996 Proc. IEEE 84 765
[5] Suganuma H U S Patent 6 249 381
[6] Dingel B, Kawata S, Minami S 1993 Optik 94 132
[7] Kurtz A F, Kruschwitz B E, Ramanujan S U.S. Patent 6 577 429
[8] Lowenthal S, Joyeux D 1971 J. Opt. Soc. Am. 61 5376
[9] Trisnadi J I 2002 Proc. SPIE 4657 131
[10] Kovarz M W, Bonilla F H, Kruschwitz B E, Phalen J G U.S. Patent 7 046 446
[11] Fung A K, Cheng M F 1985 J. Opt. Soc. Am. A 2 2274
[12] Liu M, Cheng C F, Song H S, Teng S Y, Liu G Y 2009 Acta Phys. Sin. 58 5376 (in Chinese) [刘 曼、 程传福、 宋洪胜、藤树云、刘桂媛 2009 58 5376]
[13] Goodman J W 1976 J. Opt. Soc. Am. 66 1145
[14] Jakeman E, McWhirter J G 1981 Appl. Phys. B 26 125
[15] Popov I A, Sidorovsky N V, Veselov L M 1997 Opt. Comm. 134 289
[16] Cheng C F, Qi D P, Liu D L, Teng S Y 1999 Acta Phys. Sin. 48 1635 (in Chinese) [程传福、亓东平、刘德丽、藤树云 1999 48 1635]
[17] Jakeman E, Tough R A 1988 Adv. Phys. 37 471
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[1] Shin S C, Yoo S S, Lee S Y, Park C Y, Park S Y, Kwon J W, Lee S G 2006 Displays 27 91
[2] Goodman J W 1975 Laser Speckle and Related Phenomena (Heidelberg: Springer) p9
[3] Wang L L, Tschudi T, Halldórsson T, Pétursson P R 1998 Appl. Opt. 37 1770
[4] Iwai T, Asakura T 1996 Proc. IEEE 84 765
[5] Suganuma H U S Patent 6 249 381
[6] Dingel B, Kawata S, Minami S 1993 Optik 94 132
[7] Kurtz A F, Kruschwitz B E, Ramanujan S U.S. Patent 6 577 429
[8] Lowenthal S, Joyeux D 1971 J. Opt. Soc. Am. 61 5376
[9] Trisnadi J I 2002 Proc. SPIE 4657 131
[10] Kovarz M W, Bonilla F H, Kruschwitz B E, Phalen J G U.S. Patent 7 046 446
[11] Fung A K, Cheng M F 1985 J. Opt. Soc. Am. A 2 2274
[12] Liu M, Cheng C F, Song H S, Teng S Y, Liu G Y 2009 Acta Phys. Sin. 58 5376 (in Chinese) [刘 曼、 程传福、 宋洪胜、藤树云、刘桂媛 2009 58 5376]
[13] Goodman J W 1976 J. Opt. Soc. Am. 66 1145
[14] Jakeman E, McWhirter J G 1981 Appl. Phys. B 26 125
[15] Popov I A, Sidorovsky N V, Veselov L M 1997 Opt. Comm. 134 289
[16] Cheng C F, Qi D P, Liu D L, Teng S Y 1999 Acta Phys. Sin. 48 1635 (in Chinese) [程传福、亓东平、刘德丽、藤树云 1999 48 1635]
[17] Jakeman E, Tough R A 1988 Adv. Phys. 37 471
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