Book

Laser Spectroscopy (1974)

by Nicolaas Bloembergen

Chat with this book

Summary

Nicolaas Bloembergen's 1974 monograph "Laser Spectroscopy" presents a systematic exposition of the principles and techniques for using lasers to study atomic and molecular structure, with a focus on nonlinear optical phenomena. The central thesis is that the high intensity, monochromaticity, and coherence of laser light enable spectroscopic methods that surpass the resolution and sensitivity of conventional sources, particularly through saturation spectroscopy and two-photon absorption. Bloembergen, a Nobel laureate in physics, details how Doppler-free techniques eliminate thermal broadening, allowing precise measurement of hyperfine structures and energy level shifts. The book also covers coherent Raman scattering, optical pumping, and the use of tunable lasers for selective excitation. Readers gain a rigorous understanding of how laser-matter interactions, governed by nonlinear susceptibilities, yield detailed spectral information unattainable with thermal light sources.

Full text isn't indexed yet — this overview draws on general knowledge of the book and its metadata, and chat works the same way.

Key concepts

  • Doppler-free saturation spectroscopy — A technique using a pump laser to saturate an atomic transition and a probe laser to detect the narrow, unbroadened absorption line at the exact resonance frequency.
  • Two-photon absorption — A nonlinear process where an atom simultaneously absorbs two photons, enabling transitions to states not accessible by single-photon absorption, with Doppler-free resolution when counterpropagating beams are used.
  • Nonlinear susceptibility — A tensor quantity describing the polarization response of a medium to intense electric fields, central to calculating the efficiency of processes like second-harmonic generation and stimulated Raman scattering.
  • Optical pumping — The use of polarized laser light to selectively populate specific magnetic sublevels of an atomic state, altering the population distribution for spectroscopic study.
  • Tunable dye lasers — Laser sources with a broad gain bandwidth, allowing continuous wavelength tuning across the visible spectrum for resonant excitation of specific atomic or molecular transitions.