The paper presents the results of calculation of the optical field intensity distribution in particles of inorganic and organic materials with the refractive index of 1.4. It is shown that the optical field intensity at a drop center varies quasi-periodically with changing the diffraction parameter. The modulation period of the optical field dependence on the droplet diffraction is about unity. This makes it possible to find the intensity at the droplet center from the standard dependence calculated for a transparent particle. The calculation of optical field intensity in the main droplet maximum provides a more complicated dependence on the droplet diffraction parameter. It is shown that for the high-transparent particles with increasing size the quasi-periodic dependence of intensity in the main maximum on the diffraction parameter is replaced by a more complex pattern of interference pulsations. For high-absorption materials, two pulsation dependences, namely, the modulation dependence (the period is about 20) and the high-frequency one (the period is about unity) can be recognized. The results obtained can be used for direct calculation of evaporation of the particle material with the refractive index about 1.4 and different values of the imaginary part of the refractive index.