摘要:

New permanent magnet materials containing rare‐earth elements (RE) have been discovered. For the most part, these alloys are based on the hexagonal intermetallic compounds, Co5RE. Replacement of cobalt with copper in some of these rare‐earth compounds results in solid materials with substantial permanent magnet properties. Coercive forces as high as 28,700 Oe have been obtained in heat‐treated samples of alloys in the Co5Sm&sngbnd;Cu5Sm system.

ISSN:0003-6951    

DOI:10.1063/1.1651855

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

This Letter reports improvements in resolution and signal‐to‐noise ratio for total internal reflection hologram reconstructions. It outlines the conditions employed to produce these results and indicates some of the relevant properties.

ISSN:0003-6951    

DOI:10.1063/1.1651856

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

InternallyQ‐switched light pulses have been obtained from junction lasers. Narrow bursts of light (<400 psec wide) were detected immediatelyafterthe termination of the injection current pulse. The effect persists for a wide variation in the length of the current pulse, from less than 2 nsec to several &mgr;sec. The internal absorption losses controllingQswitching are strongly dependent on both temperature and current. The effect is only seen in diodes with very low transition temperatures (Tt) between the regions of short and long stimulated emission delay times.

ISSN:0003-6951    

DOI:10.1063/1.1651857

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Experiments with Fe‐doped CdTe samples at about 15°K show that when large electric fields are applied to a crystal in the presence of mobile electrons, selective changes in the optical absorption near 4.5 &mgr; occur. Significant increases in the absorption for wavelengths >4.38 &mgr; and accompanying decreases in the absorption for &lgr; < 4.38 are thought to be caused by the interaction of hot electrons with the Fe2+ions.

ISSN:0003-6951    

DOI:10.1063/1.1651858

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

A high‐power,Q‐switched, neodymium‐doped glass laser was used to create a blow‐off plasma at surfaces of solid materials. Measurements of the ensuing stress pulses and the associated phenomena are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1651859

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

We find that a tube of pure Ne20, excited by a discharge and placed within the cavity of a He3&sngbnd;Ne20laser operating at 6328 Å can cause a stable, continuous train of short optical pulses to be produced.

ISSN:0003-6951    

DOI:10.1063/1.1651860

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Very fast photoconductivity was observed in tellurium single crystals which were excited by a CO2laser. The photoconductivity follows completely theQ‐switched laser pulses, and the carrier lifetime is estimated to be of the order of 10−12sec.

ISSN:0003-6951    

DOI:10.1063/1.1651861

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Results on the signal intensity and collinear tuning characteristics in CW optical parametric scattering in ADP pumped at 4880 Å are presented and discussed. The corresponding idler wave is in a strong absorption region of ADP.

ISSN:0003-6951    

DOI:10.1063/1.1651862

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Traveling‐wave parametric amplification of 0.5‐GHz acoustic shear waves has been observed in CdS at room temperature. Acoustoelectric coupling provides the nonlinear interaction. Observed gain was about 10 dB/mm, which is comparable to that of the conventional acoustic amplifier.

ISSN:0003-6951    

DOI:10.1063/1.1651863

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Peak power in excess of 1 MW, at 1.315‐&mgr; wavelength, has been obtained byQswitching a small gaseous CF3I photolysis laser operating in a single axial cavity mode. When several axial modes oscillate, mode locking produces periodic pulsing of theQ‐switched output with somewhat enhanced peak power.

ISSN:0003-6951    

DOI:10.1063/1.1651864

出版商:AIP    

年代:1968

数据来源: AIP