Laser fluence and shot number dependence of laser-induced optical properties modification of transparent materials
✍ Scribed by K. Jamshidi-Ghaleh; D. Abdolahpour; N. Mansour
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 132 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
Micro-fabrication in transparent materials by
femtosecond laser-induced modification of the optical properties
inside transparent materials, preferentially optical glasses, has
received much attention. Ultra short laser pulses are capable of
inducing these modifications without cracking or even melting the
glasses. This kind of modification, which appears as darkening
inside glass relates to the trapped electrons or holes at defect
sites in the glass matrix. The femtosecond laser technology allows
controlling and modifying the optical properties of glasses on a
sub-micrometer scale. Laser fluence and laser shot number are
important parameters for femtosecond laser-induced modification of
glasses. This paper presents the 800 nm femtosecond laser-induced
optical modification inside soda lime glasses at different laser
fluence levels and laser shot numbers. Modification thresholds at
different applied laser fluences and shot numbers are measured.
Pulse energy accumulation model is proposed to predict the
behaviour of darkened area spots with applied laser fluence and
shot numbers. Our experimental results and the pulse energy
accumulation model are in good agreement.