Optical second harmonic generation (SHG) from the interface of the copper tetra-tert-butyl phthalocyanine (CuttbPc) Langmuir-Blodgett (LB) film/metals has been investigated. In spite of the existence of the inversion center, the enhancement of the signal intesity for CuttbPc/Al sample was also observed. In order to clarify the enhancement mechanism, a four-layer physical model is used to explain the nonlinear optical process. It is considered that the symmetry of the CuttbPc molecule is broken by the space cahrge induced electric field. The model calculations give a good agreement with experimental results. It was shown that electrostatic phenomena at the interace is correlated closely wiht SHG signal.
A new technique of measuring light pulse with fundamental wave information is presented in order to surmount the difficulty of phase matching of tunable laser in second- harmonic wave method. The expressions of upper-envelope of interference correlation function of fundamental pulse are derived for Gaussian and hyperbolic secant pulse shapes. It is pointed out that the width of the envelope at ordinate of 1.72 (for Gaussian) and 1.76 (for sech) equals to FWHM of second-order intensity correlation curve for above shapes respectively. It is not necessary to double frequency for this method, the arrangement of experiment is simpler and the ratio of signal to noise is greatly raised. The measurement of single pulse is simply discussed.
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.