Abstract
Two-photon absorption is becoming more interesting in the areas of 3D microfabrication and high density optical data storage because of its special application potential. Large volume information requires faster reading and writing speed for its effective application. With intense femtosecond laser, the multifocal multiphoton microscopy (MMM) may provide a good choice with fast reading/writing speed for three-dimensional data storages. However, the Gaussian laser beam profile will result in less light in the corners than the center, which produces a heterogeneous image from a uniform plane. In this paper we try to solve this problem by employing a method based on optical limiting effect. The two-photon optical limiting caused by intense femtosecond laser will change the laser intensity distribution spatially and convert the Gaussian profiles into flat beams. We try to discuss the reshaping effects by considering the two-photon optical limiting effects at different laser powers and two-photon absorption coefficients. Our results indicate that by choosing a TPA medium with appropriate two-photon coefficient and suitable laser input intensity, we can easily gain a much more flat laser beam for the MMM.
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