L13+14 Flashcards
1
Q
Effect of Lens at z=0
on a Gaussian beam
A
Lens Effect at z=0:
- Magnification
- new waist radius
- new Rayleigh range
- new position of the waist.
2
Q
q Parameter
A
q Parameter: Describes the complex beam parameter in Gaussian optics.
3
Q
Paraxial Helmholtz Equation
A
Solved using the slowly varying envelope approximation.
(Same as fresnel approximation!)
4
Q
Hermite-Gaussian Beams
A
- Solutions to eigenvalue problems with Hermite polynomials.
- Used inside optical cavities.
5
Q
Laguerre-Gaussian Beams
A
- Similar to Hermite-Gaussian but in cylindrical coordinates
- Defined by Laguerre polynomials.
6
Q
Optical Angular Momentum
A
Defined as ( l * h_bar ) per photon for Laguerre-Gaussian beams.
What is l?
7
Q
Bessel Beams
A
- Have flat wavefronts
- circularly symmetric intensity
- do not diffract
- but are impossible to generate perfectly.
8
Q
Approximate Bessel Beams
A
Bessel-Gaussian beams that diffract less and have self-healing properties.
