Wavelength dependent resonant nonlinearities in a standard saturable absorber IR26 on picosecond time scale
| Autor: | Basanth S. Kalanoor, Prem B. Bisht |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Nonlinear absorptions
Two wavelength Materials science Z-scan Resonant nonlinearity Reverse saturable absorption Self-defocusing Optical phase Two-photon absorption Degenerate four wave mixing techniques Absorption Z-scan technique Four-wave mixing Optics Non-linear optical properties Dominant mechanism Self-focusing Picosecond time scale Electrical and Electronic Engineering Physical and Theoretical Chemistry Absorption (electromagnetic radiation) Semiconductor quantum wells Two photon absorption Degenerate four wave mixing Dye laser Optical properties business.industry 1064 nm Lasers Excited states Nonlinear optics Saturable absorption Third-order nonlinear susceptibility Dye lasers Atomic and Molecular Physics and Optics Four wave mixing Electronic Optical and Magnetic Materials Picosecond Excited state absorption Optical materials Saturable absorbers business |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| DOI: | 10.1016/j.optcom.2010.05.073 |
| Popis: | Nonlinear optical properties of a standard dye IR26 have been studied by using the Z-scan technique to decipher the difference in the mechanism of nonlinear absorption on picosecond time scale at two wavelengths i.e. at 1064 nm and 532 nm. A prominent contribution of nonlinear absorption is observed in the Z-scan profiles at 1064 nm. The dye exhibits the mechanism of self-defocusing at 1064 nm in contrast to that of self-focusing at 532 nm. While the two photon absorption has been found to be the dominant mechanism of reverse saturable absorption at 1064 nm, the mechanism of excited state absorption is operating at 532 nm. Additionally, the optical phase conjugate geometry of degenerate four wave mixing (DFWM) technique has been used to measure the third order nonlinear susceptibility values at 532 nm to compare with those obtained from the Z-scan profiles. � 2010 Elsevier B.V. |
| Databáze: | OpenAIRE |
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