But here is the dirty secret of experimentalists:
Now go build your laser table. And keep a copy of Mukamel on the shelf for when your advisor visits. You can open it to a random page and say, “Yes, I was just checking the fourth-order response.” They will never know. But here is the dirty secret of experimentalists:
This wiggling polarization acts like a tiny radio antenna. It emits a new light field. This wiggling polarization acts like a tiny radio antenna
[ k_signal = -k_1 + k_2 + k_3 ]
| | What it means practically | Mukamel term to ignore | | --- | --- | --- | | Exponential decay of echo vs ( t_1 ) | Homogeneous broadening (fast dephasing) | ( T_2^* ) vs ( T_2 ) confusion | | Nonexponential decay (blip at zero delay) | Inhomogeneous broadening (ensemble disorder) | Spectral diffusion function | | Oscillations in 2D spectrum along ( t_1 ) | Quantum beats between coupled states | Coherent artifact from ( \rho_eg^(1) ) | | Diagonal elongation in 2D spectrum | Strong coupling (exciton delocalization) | Redfield relaxation tensor | | Cross-peak appears only after ( t_2 > 0 ) | Energy transfer | Forster rate ( k_ET ) | The signal shoots off in a unique direction
You are playing pool with light waves. The signal shoots off in a unique direction away from the laser beams. This is how you separate the tiny signal from the blinding laser light.
When you poke with three beams (wavevectors ( k_1, k_2, k_3 )), the polarization emits light in specific directions. The most famous is the :