  Perfect optical vortices (POVs) provide an enabling solution to address the
predicament induced by the strong dependence of classical optical vortices on
theirs carried topological charges. Here, a type of generalized POVs with
controllable impulse ring profile was proposed and demonstrated. Especially, a
type of "absolute" dark POVs surrounded by two bright ringlobes in each side
was presented, which provides a perfect annular potential well along those dark
impulse rings for trapping steadily low-index particles, cells, or quantum gas,
etc. In further, several POVs with different impulse ring profiles, including
conventional POVs with bright rings, dark POVs mentioned above, and also POVs
with controllable impulse ring profile, were demonstrated. This work opens up
new possibilities to reshape arbitrarily the impulse ring profile for perfect
vortices, and this type of novel POVs will enrich functions of optical vortices
and it should be of high interest for its potential applications in optical
manipulation, both quantum and classical optical communications, enhanced
optical imaging, and also novel structured pumping lasers, etc..
