激光与光电子学进展, 2016, 53 (9): 090301, 网络出版: 2016-09-14
相干和非相干光源对贝塞尔光束成像系统分辨率的影响 下载: 923次
Effects of Coherent and Incoherent Light Sources on Resolution of Bessel Beam Imaging System
相干光学 分辨率 相干光 非相干光 无衍射贝塞尔光束 coherence optics resolution coherent light incoherent light non-diffraction Bessel beam
摘要
研究了在无衍射光束成像过程中,相干和非相干光源对成像系统分辨率的影响。对于衍射受限的成像系统,利用衍射积分理论与傅里叶光学理论导出成像系统的点扩展函数(PSF)公式,对不同的PSF进行模拟比较,结果表明非相干光源下的PSF更加集中,成像质量更好。分别采用波长为632.8 nm的He-Ne激光相干光和中心波长458.5 nm、半峰全宽24.5 nm的蓝光发光二极管(LED)非相干光作为光源进行实验,并利用Zemax软件进行模拟。对比实验结果与数值模拟仿真结果:非相干光源下所成的条纹像粗细更加均匀清晰,分辨率更高。实验结果与理论分析及数值仿真模拟结果相吻合。
Abstract
The effects of the coherent and incoherent light sources on the resolution of imaging system are studied in the process of non-diffracting beam imaging. In the limited diffraction imaging system, the formula of point spread function (PSF) of the imaging system is derived by the diffraction integral theory and Fourier optical theory. By simulating and comparing the different PSFs, it is found that the PSF is more concentrated and the imaging quality is better under the condition of incoherent light sources. He-Ne laser coherent light with the wavelength of 632.8 nm and incoherent light of blue light LED with the center wavelength of 458.5 nm and full width at half-maximum of 24.5 nm are used for experiment as light source, and Zemax software is used to simulate. Comparing the experimental and the numerical simulation results, the thickness of the stripes image of incoherent source is more uniform, clearer and its resolution is higher. The experimental results are consistent with theoretical analysis and numerical simulation results.
何艳林, 陈姿言, 吴逢铁. 相干和非相干光源对贝塞尔光束成像系统分辨率的影响[J]. 激光与光电子学进展, 2016, 53(9): 090301. He Yanlin, Chen Ziyan, Wu Fengtie. Effects of Coherent and Incoherent Light Sources on Resolution of Bessel Beam Imaging System[J]. Laser & Optoelectronics Progress, 2016, 53(9): 090301.