Air Laser Gain & Population Inversion
The mechanism of laser-like emission at 391 nm from nitrogen gas irradiated by a strong 800 nm pump laser and a weak 400 nm seed laser is...
Amplified Spontaneous Emission v.s Superfluorescence pumped by X-ray Free Electron Laser
The transition from the amplification of spontaneous emission to superfluorescence in a three-level and swept-gain medium excited by an...
Store γ rays by Moving, and Retrieve by Reversing
Imagine a collection of nuclear targets where each of them moves with different integral multiple of certain velocity (see the top panel...