About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 68. Chapters: Stimulated emission, Spontaneous emission, Population inversion, Active laser medium, Optical amplifier, Gaussian beam, Q-switching, Laser pumping, Mode-locking, Ultrashort pulse, Optical cavity, Photoionization mode, Negative temperature, Chirped pulse amplification, Power scaling, Thermal shock, Self-focusing, Frequency comb, Optical autocorrelation, Prism compressor, Femtosecond pulse shaping, Spectral phase interferometry for direct electric-field reconstruction, High Harmonic Generation, Optical parametric amplifier, Self-pulsation, Quantum noise, Photodarkening, Lasing threshold, Continuous wave, Round-trip gain, Anti-laser, Bessel beam, Beam parameter product, Random laser, Beam expander, Quantum defect, Spatial filter, Amplified spontaneous emission, Laser linewidth, Airy beam, Optical decay, Homogeneous broadening, Arthur Maitland, Gain-switching, Optical microcavity, Optical frequency multiplier, Raman laser, Coherent addition, Output coupler, M squared, Raman amplification, Slope efficiency, Frequency Addition Source of Optical Radiation, Micro SPIDER, Bandwidth-limited pulse, Relative intensity noise, B Integral, Coupling parameter, Injection seeder, Pyrromethene, Laser Physics, Fourier Domain Mode Locking, Beam homogenizer, Thermal blooming, Dasar, Regenerative amplification. Excerpt: Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier. The pump power must be higher than the lasing threshold of ...
