KEYWORDS: Mid-IR, Vibration, Difference frequency generation, Spectroscopy, Physical coherence, Visible radiation, Ultrafast phenomena, Sum frequency generation, Near infrared, Molecules
We study Four Wave Mixing (FWM) generated based on a mid-infrared pulse and a near infrared pulse. The mid infrared light is near resonant with vibrational modes of molecule, and it can create a coherence between vibrational states. The near infrared light will probe the coherence and result in FWM based on third order nonlinearity through different pathways. One pathway is a third-order Sum Frequency Generation (tSFG) and the other is a third-order Difference Frequency Generation (tDFG). We report experimental investigation of a time resolved tDFG generated from plastic materials such as mixed beads and a thin Low-Density Polyethylene (LDPE) film. We compare results of the tDFG with that of the tSFG in terms of their intensities and phase matching conditions. Our results show that a vibrational spectroscopy combing the tDFG and the tSFG can be versatile tools in studying of physical chemistry, dynamics of complicated molecular system, bioimaging and so on.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.