设计并制备了一个新型类贝塞尔调制螺旋相位片，该相位结构是由类贝塞尔函数表示的振幅信息加载到螺旋相位上构成的，通过选择合适的调制参数，使得透射率在相位结构边缘处为零，能够大幅度消除再现光学旋涡光束的旁瓣。采用在纯相位型元件上调制复振幅的编码方法，实现振幅型到纯相位型的转换。通过优化多灰阶激光直写工艺，对每一个像素高度进行调制，直接将该相位片加工在基底是玻璃的光刻胶上。搭建光路验证了光束强度分布，并取得了与理论预期高度一致的结果，为产生高质量旋涡光束提供了一个简便、可靠和低成本的微光学元件手段。

A new kind of phase plate using a variable Bessel-like function is designed and fabricated. The amplitude part is the variable Bessel-like function and the phase part is the spiral phase plate. The design suppresses the beam′s sidelobes significantly by choosing a proper modulatd parameter. A pure phase plate can be gotten through an encoding method. After optimization of gray scale laser direct writing process, the new kind of phase plate is fabricated on the photoresist slide substrate. Performance of the modulated phase plate is verified by using beam intensity distribution, which is in excellent agreement with the theoretical prediction. The proposed method gives rise to a simple, reliable, and low-cost micro-optical element solution for the generation of high quality optical vortices.