Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

New technique for degenerate two-photon absorption spectral measurements using femtosecond continuum generation

Guang S. He, Tzu-Chau Lin, Paras N. Prasad, Ramamurthi Kannan, Richard A. Vaia, and Loon-Seng Tan

Open Access Open Access

Abstract

We present a new technique for direct measurements of degenerate two-photon absorption (TPA) spectra of two-photon absorbing materials including non-fluorescent samples. This technique is based on the use of an intense single continuum-generation beam as the coherent white-light source with specially flattened spectral distribution. The different spectral components of the continuum beam are spatially dispersed and then passed through the sample material along different pathways so that nondegenerate TPA processes among different input spectral components can be avoided. By comparing the input and transmitted continuum spectral distributions, the TPA spectrum for a given sample can be obtained. As an example, the continuous TPA spectrum (from 550 to 1000 nm) is measured for a novel two-photon-absorbing compound (AF-389) which exhibits an extremely high TPA cross-section value of ~1×10-20 cm4/GW, or ~249 GM, around ~800-nm spectral range in femtosecond regime.

©2002 Optical Society of America

Full Article  |  PDF Article
More Like This
Z-scan measurements using femtosecond continuum generation

Leonardo De Boni, Acácio A. Andrade, Lino Misoguti, Cléber R. Mendonça, and Sérgio C. Zilio
Opt. Express 12(17) 3921-3927 (2004)

Two-photon spectroscopy and analysis with a white-light continuum probe

Raluca A. Negres, Joel M. Hales, Andrey Kobyakov, David J. Hagan, and Eric W. Van Stryland
Opt. Lett. 27(4) 270-272 (2002)

Ultrafast measurement of two-photon absorption by loss modulation

Peifang Tian and Warren S. Warren
Opt. Lett. 27(18) 1634-1636 (2002)

View More...

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (4)
Fig. 1.
Fig. 1. Experimental setup for white light continuum generation and degenerate TPA spectral measurement. ND: neutral density filters.

Download Full Size | PDF

Fig. 2.
Fig. 2. Relative spectral curves of the continuum generation from heavy water: (a) at eight different input average power levels from 0.4 to 35 mW, (b) at 35-mW input level but after passing through a spatially selective silver-strip coating attenuator.

Download Full Size | PDF

Fig. 3.
Fig. 3. Chemical structure of AF389, a strongly two-photon absorbing chromophore.

Download Full Size | PDF

Fig. 4.
Fig. 4. (a) Relative spectral intensity distributions of the continuum after passing through a pure THF sample and an AF389/THF sample respectively, (b) Intensity-dependent transmissivity change due to AF389 chromophore, and (c) Relative TPA coefficient curve as a function of wavelength for AF389 in THF.

Download Full Size | PDF

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

T ( λ ) = I AF ( λ ) I THF ( λ )
T ( λ ) = 1 1 + βzI THF ( λ ) .
β ( λ ) = 1 − T ( λ ) I THF T ( λ ) z = 1 − T ( λ ) I AF ( λ ) z .
σ 2 ( λ ) = β ( λ ) N A d 0 × 10 − 3 ( cm 4 GW ) ,
σ 2 ′ ( λ ) = hν × σ 2 ′ ( λ ) = hν × β ( λ ) N A d 0 × 10 − 3 ( cm 4 sec ) .
Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use