| Autor: | R. McDuff, J. A. Hermann, P. B. Chapple |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Materials science
business.industry Physics::Optics Optical power Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Nonlinear system Optics Transmission (telecommunications) Rayleigh length Transmittance Limiter Electrical and Electronic Engineering business Saturation (chemistry) Gaussian beam |
| Zdroj: | Optical and Quantum Electronics. 31:555-569 |
| ISSN: | 0306-8919 |
| Popis: | Optical limiters relying on nonlinear absorption or nonlinear refraction are most effective against an incoming laser beam when the active material is thicker than one Rayleigh length. We have found that a variety of thick optical limiter configurations can be modelled by integrating the formulae for optical transmission by thin media, and that the results are exact to the first order in power or irradiance. The limiter behaviour saturates as the optical power increases. For the case of thick irradiance-dependent absorbers and an incident Gaussian beam model, we have also found that the predictions of a simple saturation formula for the optical transmittance agree well with the transmittance values computed using a numerical technique. Under certain conditions this saturation formula is also suitable for describing the transmission of nonlinear refractors, thereby providing a straight-forward technique for modelling limiters over a broad parameter range. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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