双色散楔对宽带激光束传输的平滑效应

运用惠更斯菲涅耳衍射积推导了宽带脉冲激光通过双色散楔的传输方程,并将双色散楔与单色散楔对宽带激光束的平滑效应进行了对比。结果表明,单色散楔和双色散楔对宽带激光束传输都有很好的平滑作用,色散楔顶角θ越大,光强横向分布越均匀;单色散楔引起脉冲的前沿和后沿失真,双色散楔可以克服这种不足,同时保持输出光束的传输方向也与输入光束的方向平行。

Smoothing Effect in the Broadband Laser Throug Paired Dispersive Wedges

The intensity expression of an apertured broadband laser beam passing through paired dispersive wedges is derived on the basis of the Huygens-fresnel diffraction integral.Smoothing effect of paired dispersive wedges on the intensity profiles of the apertured broadband laser beam is compared with that of single dispersive wedge.It is whown that,given an appropriate bandwith,both can achieve remarkable smoothing effect in an apertured broadband laser beam,the bigger the wedge angle of the dispersive wedge,the more smoothing the transverse intensity profile,in addition,paired dispersive wedges can eliminate the wave-form aberration introdued by using a single dispersive wedge,and direct the output laser beam to parallel the incident one.