Descrição
The Ti:Sapphire femtosecond laser is a ultra-short pulse solid-state laser developed by Moulton (1986). It is characterized by having a sapphire crystal doped with titanium ions, that has a four-level structure, as a gain medium. The crystal enables the Kerr Lens Mode-locking method, since it has third-order nonlinear optical properties that produces the self-focusing effect at high intensities. The operability of the ultrashort pulse laser requires complete stability of the optical cavity to achieve the mode-locking regime. (1) The cavity has a ring format, which is of the bow tie type, whose configuration is appropriate for the generation of ultrashort pulses in the 800nm range with a temporal duration of the order of tens of femtoseconds and a high repetition rate of 1 GHz. (2) This model allows adaptation to a laser scanning system with high numerical aperture (NA) focusing optics, which can be applied in biological tissue ablation studies, such as the cornea. The advantage of the low-energy and high-repetition rate femtosecond laser is that tissue can be teared with thin, highly localized cuts without collateral damage, producing cavitation bubbles with diameters of a few micrometers, using a compact, versatile, and high-precision mounting. (3)
Referências
1 NOGUEIRA, G. T.; CRUZ, F. C. Efficient 1 GHz Ti:Sapphire laser with improved broadband continuum in the infrared. Optics Letters, v. 31, n. 13, p. 2069-2071, 2006.
2 YEFET, S.; PE’ER, A. A review of cavity design for Kerr lens mode-locked solid-state lasers. Applied Sciences, v. 3, n. 4, p. 694-724, 2013.
3 EHLERS, A. et al. High (1GHz) repetition rate compact femtosecond laser: a powerful multiphoton tool for nanomedicine and nanobiotechnology. Journal of Applied Physics, v. 102, n. 1, p. 014701-1-014701-6, 2007.
| Certifico que os nomes citados como autor e coautor estão cientes de suas nomeações. | Sim |
|---|---|
| Palavras-chave | Femtossecond laser. High repetition rate. Compact cavity. Low energy. |
| Orientador e coorientador | Prof. Dr. Jarbas Caiado de Castro Neto |
| Subárea 1 | Óptica |
| Subárea 2 (opcional) | Fotônica |
| Agência de Fomento | Sem auxílio |
| Número de Processo | Não se Aplica |
| Modalidade | MESTRADO |
| Concessão de Direitos Autorais | Sim |
