摘要:

The linear and nonlinear optical properties of &agr;‐HIO3have been measured in the visible and near‐infrared. Phase‐matched second harmonic generation is shown to occur for both parallel and orthogonal input polarizations. The observed phase‐matching surfaces are in agreement with theory. In addition, (a) large single crystals of high optical quality are easily grown from water solution; (b) the measured nonlinear coefficientd14is slightly larger thand31in LiNbO3; and (c) no ``optical damage'' effects occur at high power densities. Preliminary results indicate that a substantial number of iodates exhibit similar nonlinear optical properties.

ISSN:0003-6951    

DOI:10.1063/1.1651945

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Narrow pulses have been generated in a reverse‐pumped Raman laser containing H2. The output from aQ‐switched ruby laser was focused into a H2cell and converted into pulses with halfwidths of 3 × 10−10sec at 9755 Å.

ISSN:0003-6951    

DOI:10.1063/1.1651946

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Measurements are made of the nonlinear optical effect third order in electric field strength in Ge and Si using a CO2laser operating at 10.6 &mgr; and 9.2 &mgr;. The effect is due to bound electrons and is described by a fourth‐rank electric susceptibility tensor. The crystals show anisotropy in the nonlinear coefficients whose absolute values are consistent with Miller's phenomenological theory. Comparison is made with the measured values of calcite.

ISSN:0003-6951    

DOI:10.1063/1.1651947

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Emission of coherent radiation was observed from ZnS which was excited through two‐photon absorption of radiation from a giant‐pulse ruby laser. The spectral width decreased from 75 to 12.8 Å above a threshold ruby‐laser power of 35 MW/cm2. Photographic pictures showed a beam divergence of less than 1°.

ISSN:0003-6951    

DOI:10.1063/1.1651948

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Two methods to obtain higher multiple bit rate optical pulses from a laser are described, namely a mode‐quenching method and a FM perturbation method. Optical pulses up to 600 Mbit/sec were experimentally obtained with a He&sngbnd;Ne laser. A tentative explanation of the occurrence of multiple bit pulses in the second method without mode quenching is given.

ISSN:0003-6951    

DOI:10.1063/1.1651949

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

CharacteristicKx rays from thermal neutron fission of U235were studied as a function of the fission fragment mass. With a NaI (Tl) detector viewing the first 1 cm of fragment paths, x rays in coincidence with fission were recorded together with the fragment energies as detected by silicon surface‐barrier detectors. Results are reported for yields ofKx rays as a function of fragment mass. The most probable charge for various masses is estimated.

ISSN:0003-6951    

DOI:10.1063/1.1651950

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Resistance monitoring has been used to follow structural changes during electromigration in aluminum films. Two stages of migration were found, the first corresponding to gross mass transport, the second to void growth and stripe failure. An activation energy for the first stage was determined to be 0.5–0.6 eV from change‐in‐rate, change‐in‐temperature tests, indicating boundary diffusion. Transmission electron microscopy showed voids existing in areas of thinned aluminum. Corollary work on aluminum stripes on NaCl substrates showed nonadhesion to be a strong contributor to void formation, suggesting the possibility that the thinned regions were caused by hot spots at sites of nonadhesion.

ISSN:0003-6951    

DOI:10.1063/1.1651951

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A strong lens effect has been experimentally observed when the electric field inside a CdS plate is so adjusted that strong quasi‐standing ultrasonic waves are set up inside the crystal. Physical understanding of the observed phenomena and possible device applications are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1651952

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Stimulated emission from 19 polymethine dyes pumped by aQ‐switched ruby laser is reported in this Letter. High power laser emission (>1 MW) has been obtained over the whole wavelength range from 710 m&mgr; to 1060 m&mgr;.

ISSN:0003-6951    

DOI:10.1063/1.1651953

出版商:AIP    

年代:1968

数据来源: AIP

ISSN:0003-6951    

DOI:10.1063/1.1651954

出版商:AIP    

年代:1968

数据来源: AIP