The beam quality of nonparaxial Hermite-sine-Gaussian beam

✍ Scribed by Peihong Ding; Jun Qu; Kai Meng; Zhifeng Cui

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 505 KB
• Volume: 281
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2007.09.051

✦ Synopsis

Based on the theory of the second intensity moment of nonparaxial scalar beam and the method of angular spectrum, the expressions for the far-field divergence angle, waist width and M 2 factor of nonparaxial Hermite-sine-Gaussian (HSiG) beams are derived. Calculation and analysis show the dependence of the far-field divergence angle of nonparaxial HSiG beams on the parameter w 0 /k, as well as on order m, And it with even and odd orders approach 73.898°and 63.435°as w 0 /k ! 0. With increasing order m and the parameter w 0 /k, the waist width increase monotonously, which is same as paraxial case. But nonparaxial M 2 factor is different from paraxial case, it cannot only less than 1, but also approach 0 as w 0 /k ! 0.