  The generation and measurement of optical vortex (OV) are the basis for a
variety of related applications. However, the special case of high-order OVs
has not been sufficient addressed yet. Herein, a generation and measurement
method of high-order OV via utilizing the CP is investigated. In the
experiment, we generate OVs with l=60, p=20 and successfully measure OVs with
l=200,p=0, where experimental results agree well with simulation outcome. On
this basis, the intensity distributions of LG and HG beams (corresponding to
the generation and measurement) versus waist radius of initial light beams is
discussed. This work provides an alternative method to generate or measure
high-order OV, which will facilitate applications in optical
micro-manipulation, quantum entanglement and rotation speed detection.
