Spectral Characteristics of Molecular Two-Photon Transitions

摘要: The new level of molecular spectroscopy promoted by the development laser is no means limited to advances summarized in previous chapter, which were restricted linear interaction processes between molecules and light. high density monochromatic energy light satisfied requirements nonlinear two-photon absorption, strength proportional square incident intensity. process was first demonstrated Kaiser et al. [4.1] Doppler-free high-resolution gases recognized Chebotayev co-workers [4.2], has been achieved independently Cagnac et. [4.3], Levenson [4.4] Hansch [4.5]. Although one-photon continues represent mainstream spectroscopy, follwing aspects have led a rapid field absorption spectroscopy: 1) The final state forbidden for absorption. 2) The can be as twice that corresponding frequency large important zone called Rydberg states, presently need much investigation, considerable extent studied with commercially available wide-range tunable dye lasers.