Abstract
The effect of focusing a laser beam on the intensity (I) dependence of multiphoton processes was examined. A general method is given to deduce a genuine intensity dependence from the focused-beam experiment. In addition, some typical examples were examined in detail. For the dependence of the type ofI n, an apparent relation ofI 3/2 appears only when there is a change of dependence asI n→Im, withn>3/2 andm<3/2. A genuine intensity dependence can be obtained directly from the focused beam experiment ifn does not change throughout the irradiated volume, or if the conditionn>3/2>m does not hold. The case of gradually decreasingn, as is common for the infrared multiphoton reaction probability (P), was also analyzed taking the Arrhenius-type dependence,P ∝ exp(−Θ/I), as an example. A simple method is proposed to obtain a genuine relation betweenP andI for this type of intensity dependence.
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Hanazaki, I. Focusing effect of a laser beam on the power dependence of multiphoton processes. Appl. Phys. B 26, 111–116 (1981). https://doi.org/10.1007/BF01284911
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DOI: https://doi.org/10.1007/BF01284911