摘要:

Using the models established for the growth‐induced anistropy in flux‐grown crystals and parameters determined from anisotropy measurements in bulk crystals, the anisotropy in epitaxial films is predicted. Comparison with experiment shows that the signs of the anisotropy are correctly predicted and that magnitudes are in fair agreement.

ISSN:0003-6951    

DOI:10.1063/1.1653973

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

This letter reports measurements of the intensity‐dependent transmittance of ethylene near 949 cm−1. The qualitatively different behavior of transmittance for the CO2laser linesP(12) andP(16), which are nearly symmetrically located on opposite sides of the ground‐state resonance, is described in terms of a 3‐level model with an anharmonic frequency shift in the excited‐state resonance. The results are also compared to the predicted intensity‐dependent transmittance for a 2‐level model.

ISSN:0003-6951    

DOI:10.1063/1.1653974

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Images at 0.96 &mgr;m of 10.6‐&mgr;m illuminated objects were obtained by the parametric image upconversion technique. The nonlinear material used in this experiment was a single crystal of proustite pumped by 1.06‐&mgr;m radiation from a single‐mode Nd:YAG laser. Angular resolution of about 3 mrad and a 12‐deg field of view were obtained. The upconverter was operated in a Fourier‐space configuration and gave nearly diffraction‐limited performance.

ISSN:0003-6951    

DOI:10.1063/1.1653975

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Optical holographic storage in single‐crystal LiNbO3is described which can be optically erased at room temperature and then rewritten with no degradation in efficiency or writing rate. The diffraction efficiencies associated with this process are about 10−4. Some variations from previously reported results include a lack of a threshold power density for writing, very‐long‐term persistence of the stored hologram, and a lack of a dependence of the diffracted intensity on the polarization of the readout beam.

ISSN:0003-6951    

DOI:10.1063/1.1653976

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Dielectric measurements on a single crystal of semicarbazide hydrochloride show three maxima at temperatures of −230, 19, and 21 °C. Initial data for the highest peak clearly suggest a ferroelectric‐paraelectric transition with a Curie temperature of 21 °C. In the paraelectric region the Curie law is well followed.

ISSN:0003-6951    

DOI:10.1063/1.1653977

出版商:AIP    

年代:1972

数据来源: AIP