Summary

This book presents the fundamental principles of nonlinear optical phenomena and their application in laser spectroscopy, focusing on the theoretical underpinnings and experimental techniques prevalent in 1980. Prokhorov's central thesis is that understanding and controlling the nonlinear interaction of light with matter allows for unprecedented precision in analyzing atomic and molecular structures, leading to advanced spectroscopic methods. The text details how intense laser fields, exceeding linear approximations, induce phenomena like harmonic generation, parametric interactions, and multiphoton absorption, which are then harnessed to probe matter with high spectral resolution. Readers gain insight into the physics governing these processes and the experimental setups required to observe and exploit them for spectroscopic purposes.

The book covers various spectroscopic techniques that leverage nonlinear optics, including Raman spectroscopy, optical parametric spectroscopy, and saturation spectroscopy. It explains how nonlinear effects enable the study of previously inaccessible spectral ranges and provide a means to overcome the limitations of linear spectroscopy, such as Doppler broadening. The reader emerges with a solid grasp of the theoretical framework necessary for designing and interpreting experiments in nonlinear optics and laser spectroscopy, providing a…

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Key concepts

Harmonic Generation — The process where photons of an intense laser beam combine to create a new photon with a frequency that is an integer multiple of the original frequency.
Parametric Interaction — The nonlinear process where a pump photon splits into two photons (signal and idler) of lower energy, conserving energy and momentum.
Multiphoton Absorption — The absorption of two or more photons simultaneously by a material to excite an electronic or vibrational state, a process forbidden by linear optics.
Nonlinear Susceptibility — A measure of how strongly a material's polarization responds to an applied electric field in a nonlinear fashion, quantified by coefficients like $\chi^{(2)}$ and $\chi^{(3)}$.
Saturation Spectroscopy — A laser spectroscopy technique that uses two beams (a saturating and a probing beam) to selectively probe transitions unaffected by Doppler broadening.