# I Orbital angular momentum wavefront velocity

1. Feb 16, 2017

### calinvass

Is the wavefront velocity if an OAM mode 1 light beam proportional to its wavelength?
I understand that the helical structure step length gives the wavelength of the beam. In this case, a small wavelength beam would travel much slower. The problem is, f=v/λ, but now v<c and if λ is shorter then f is higher but not that much because v gets increasingly slower.

2. Feb 16, 2017

### Chandra Prayaga

Sorry. I do not know this. But why would the small wavelength beam travel slower?

3. Feb 16, 2017