Summary
This 1975 treatise, co-edited by Nicolaas Bloembergen, compiles authoritative reviews on the state of quantum electronics, focusing on the theoretical and experimental foundations of lasers, nonlinear optics, and their applications. The central thesis is that quantum electronics had matured into a coherent discipline requiring systematic treatment of light-matter interactions, particularly the nonlinear responses of materials to intense electromagnetic fields. Key chapters cover laser theory, optical parametric oscillators, multiphoton processes, and coherent transient effects, with emphasis on the semiclassical and quantum-mechanical frameworks that describe these phenomena. A reader gains a rigorous understanding of how atomic and molecular systems interact with radiation, including the principles behind frequency conversion, saturation spectroscopy, and photon echoes.
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Key concepts
- Nonlinear susceptibility — A tensor describing the polarization response of a medium to multiple electromagnetic fields, enabling processes like second-harmonic generation.
- Optical parametric oscillator — A device that converts a pump laser into two lower-frequency beams (signal and idler) via a nonlinear crystal, tunable over a wide wavelength range.
- Saturation spectroscopy — A technique using intense laser fields to burn spectral holes in inhomogeneously broadened lines, revealing hyperfine structure and eliminating Doppler broadening.
- Photon echo — A coherent optical transient where two laser pulses rephase atomic dipoles, producing a delayed emission pulse that measures dephasing times.
- Rate equations — Simplified models for laser dynamics that balance population inversion and photon number, neglecting phase coherence.
- Multiphoton absorption — The simultaneous absorption of two or more photons via virtual intermediate states, requiring high intensity and obeying selection rules different from single-photon transitions.