Study on the approximative formula for the far-field of a Gaussian beam under circular aperture diff

• 作 者: 刘宏展 粱瑞生 黄旭光
• 机 构: Laboratory of Photonic Information Technology South China Normal University,Laboratory of Photonic I
• 出 处: Chinese Optics Letters
• 发表日期: 2007年01期
• 关键词: divergence aperture wavefront transmitter superposition instead calculating circ

The approximative formula for the far-field diffraction of a Gaussian beam through a circular aperture is obtained by using the superposition of Gaussian beams instead of the aperture function, and the explicit expression for calculating the beam divergence is also gained. Using the formula, the influences of the aberrations on the far-field wavefront and the beam’s divergence are researched, and the results show that the large aberrations badly affect the far-field wavefront and the divergence. It is suggested that the aberrations and the diffractions should be avoided when designing the transmitter.

The approximative formula for the far-field diffraction of a beam aperture is obtained by using the superposition of Gaussian beams instead of the aperture function, and the explicit expression for calculating the beam divergence is also gained. Using the formula, the influences of the aberrations on the far-field wavefront and the beam’s divergence are researched, and the results show that the large aberrations badly affect the far-field wavefront and the divergence. It is suggested that the aberrations and the diffractions should be avoided the transmitter.