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Design of Dielectric Bragg Mirror Consisting Quarter-Wave Stacks Using Transfer-Matrix Method | ||
| Al-Mustansiriyah Journal of Science | ||
| Article 1, Volume 22, Issue 5, 2011, Pages 243-256 | ||
| Author | ||
| Amal M. A. Al-Hillou | ||
| Abstract | ||
| All recent researches in Iraq deal with Nanotechnology. Our research deals with Femtotechnology, which is very advanced in laser and fiber optics technology. Where: Nanotechnology = seconds. Nevertheless: Femtotechnology = seconds. Where in femtosecond lasers: lasers emitting pulses with durations between a few femtoseconds and hundreds of femtoseconds. The generation of ultrashort pulses, that is pulses in the order of picoseconds and femtosecond lasers involves optical coatings as important functional elements, e.g. high reflectors (HR), output couplers (OC) and antireflection (AR) coatings. These optical elements are based on the interference phenomenon of light. Their theoretical analysis generally relies on the well-known scattering matrix formalism derived from the Maxwell equations. Laser performance strongly depends on the quality of optical coatings: reflectance of high reflectors should approach the ideal 100% value at the operation wavelengths in order to minimize laser inter cavity losses and output coupling has to be set to specific values to ensure optimal operation. This paper reports a theoretical design of dielectric Bragg mirror (DBM) to achieve high reflectivity and dispersion compensation over a broad bandwidth. Analytic expressions for reflectivity (R), group delay (GD) and group delay dispersion (GDD) are used. Dielectric materials TiO2/SiO2 arranged as a periodic stacks have been used to design Bragg mirrors using the Fusedsilica as a substrate. In this paper we demonstrate a dielectric multilayer mirror with a controlled reflectivity and dispersion in the wavelength range , it exhibits a reflectivity of >99.999999%. These stacks have a maximum reflectivity at 800nm. The group delay and group delay dispersion also have shown a low oscillation. | ||
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