Physics & Astronomy
free electron lasers
100%
atoms
79%
spontaneous emission
73%
Bose-Einstein condensates
61%
masers
57%
pumps
48%
lasing
47%
cavities
47%
monatomic gases
42%
free electrons
34%
cold gas
32%
electron beams
28%
laser beams
26%
gratings
26%
radiation distribution
26%
amplifiers
24%
modulation
22%
high gain
21%
Rayleigh scattering
21%
interactions
21%
momentum
20%
pulses
19%
rings
19%
radiation
19%
mirrors
18%
solitary waves
17%
lasers
17%
light scattering
15%
electrons
15%
nonlinearity
15%
propagation
15%
harmonics
14%
bunching
13%
wavelengths
13%
thresholds
12%
broken symmetry
12%
cooling
12%
synchronism
12%
degrees of freedom
12%
optical bistability
12%
scattering
11%
oscillations
11%
relativistic electron beams
11%
photons
10%
center of mass
10%
cyclotron resonance
10%
angular momentum
10%
atomic interactions
9%
microwaves
9%
magnetic fields
9%
Engineering & Materials Science
Atoms
65%
Free electron lasers
59%
Spontaneous emission
52%
Masers
42%
Electrons
34%
Radiation
29%
Laser beams
24%
Superradiance
21%
Optomechanics
16%
Feedback
15%
Pumps
15%
Mirrors
14%
Electron beams
14%
Rayleigh scattering
13%
Solitons
13%
Harmonic generation
13%
Light scattering
11%
Optical bistability
11%
Wavelength
11%
Vapors
11%
Experiments
10%
Microwave generation
10%
Gases
10%
Scattering
9%
Lasers
8%
Phase transitions
8%
Cathodes
8%
Quantum theory
8%
Amplification
7%
Photons
7%
Diffraction
7%
Magnetic fields
7%
Physics
7%
Laser tuning
6%
Microwaves
6%
Electronic states
6%
Magnetization
6%
Coherent scattering
6%
Magnetic moments
6%
Ground state
6%
Light amplifiers
6%
Plasmonics
6%
Momentum
5%
Optical lattices
5%
X rays
5%
Angular momentum
5%
Phase diagrams
5%
Gamma rays
5%