Quantum Tao

Another nice video of crossover.

JILA BEC group published an Easy BEC Machine online.

It is detailed in Heather Lewandowski’s long JITP article.

Chapter 4: Cylindrical Waveguides

Acceptance angle and numerical aperture: The medium outside the fiber is , the fiber core is , fiber cladding is . The acceptance angle can be related to the refractive indices by . NA(numerical aperture) has been defined as . (more…)

Chapter 3: Planar Waveguides

waveguide mode: a pattern of light distribution that remains constant along the waveguide.

In order for the waves to reinforce each other after many reflections, the total round-trip phase change for propagation in the transverse (x) direction must be an integer multiple of . The condition for self-reinforcing fields is . Not all angles of light propagation are possible in a waveguide, only some discrete angles will propagate in a way that is self-reinforcing. (more…)

Now we have Yao Ming, T-Mac and Steve Francis!

Can’t wait to watch Houston Rockets’ next season.

Chapter 2 Review of Optics:

phase velocity and group velocity:
wave under pulse envelope moves at phase velocity, the envelope moves at group velocity

energy in a light wave:
energy density (energy per unit volume) in E field ,
electric and magnetic components carry an equal amount of energy
light intensity : the energy passing through a surface per unit time per unit surface area when the surface is oriented perpendicular to the beam
light energy inside cylinder can be calculated either from energy density times volume or intensity times area times time interval.
So . (more…)

Photonics and Lasers: An Introduction

This is an introduction to photonics and lasers that does not rely on complex mathematics.

It is perfect for refreshing the knowledge.

Next is some knowledge I am not familiar but I should be familiar.

Crossover is the most effective way to break the defense when you dribble the ball.

Now Starbury shows how to do that.

Once you get crossed, it is over!

I like Aaron. I think he can play big in Houston.

Good luck, Aaron!