摘要:

Application of thermal dissociation of O2, developed within arc‐heated gas mixtures, followed by a sufficiently rapid convection to preserve O atom concentrations and subsequent CS2injection, has generated efficiently a CO laser medium. In preliminary experiments, this pumping technique has produced a 34‐W cw laser emitting over a band of vibration‐rotation transitions from 4.9 to 5.7 &mgr; from a 5‐cm active transverse optical cavity.

ISSN:0003-6951    

DOI:10.1063/1.1654363

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Secondary emission measurements have been made on thick and thin epitaxially grownp‐doped GaAs. Reflection mode gains of 400 at primary voltages of 20 kV have been observed for unthinned layers. The variation of gain with white‐light photoresponse has also been measured. For 5‐&mgr;‐thick self‐supporting layers, a gain of 115 and 30 (at 10 kV primary voltage) has been measured for the reflection and transmission modes, respectively. The escape depth is estimated to be 2 &mgr; with an escape probability of 0.14.

ISSN:0003-6951    

DOI:10.1063/1.1654364

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Transitions of the deep O donor in a GaPp‐njunction are studied by photocapacitance. It is found that the O donor may deeply trap either one or two electrons. The four optical absorption cross sections are measured for the two states, and from this information the O concentration profile is determined. The concentration ranges from (4 ± 1) × 1014cm−3on thenside to (1.5 ± 0.2) × 1016cm−3on thepside of the junction depletion layer. It is believed that these measurements represent the first direct determination of the concentration of O donors in GaP.

ISSN:0003-6951    

DOI:10.1063/1.1654365

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Laser beams, when partially absorbed in epitaxial (Er2Eu1Ga0.7Fe4.3O12) magnetic garnet films, are used to thermally manipulate bubble and strip magnetic domains. Bubbles and strips can be created or annihilated, as well as captured and moved about freely by the light spot, without the use of magnetic circuits. Bubbles can be arranged in fixed arrays or propagated at high speeds. A novel form of reversible strip domain writing is demonstrated.

ISSN:0003-6951    

DOI:10.1063/1.1654366

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The effects of heat treatment on platinum silicide Schottky diodes with aluminum metal contacts have been investigated. It has been found that the aluminum reacts with the silicide causing a change in the effective metal‐semiconductor barrier height over a range of approximately 0.25 eV. Schottky diodes with initial platinum silicide characteristics convert to devices with barrier heights characteristic of aluminum after extended heat treatments.

ISSN:0003-6951    

DOI:10.1063/1.1654367

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

High‐efficiency GaP (Zn&sngbnd;O) diodes have been observed, in some instances, to show a substantial and permanent increase in efficiency when subjected to a large forward bias. Experiments suggest that the effect is related to precipitation in thenandplayers. A model is presented which is able to account for most of the observations.

ISSN:0003-6951    

DOI:10.1063/1.1654368

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The damage threshold for three optical glasses was found to be higher for circularly polarized radiation than for linear polarization, using 26‐nsec pulses from a Nd:glass laser. The damage was assumed to result from self‐focusing. The fractional contribution of electrostriction to the total nonlinear indexn2is estimated to be 0.8 ± 0.2 for borosilicate crown glass, 1.15 ± 0.35 for fused silica, and 0.4 ± 0.1 for dense flint glass, assuming the Kerr effect to be the only other self‐focusing mechanism. The data are consistent with present concepts of glass structure. The high damage threshold in fused silica is attributed to its relatively small Kerr effect.

ISSN:0003-6951    

DOI:10.1063/1.1654369

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A technique for experimentally measuring thez‐component fields produced by Permalloy drive circuits in the presence of both bubble and external in‐plane drive fields is proposed. Experimental results based upon this technique are presented for a simple bar, a Y‐bar propagation pattern and a chevron propagation pattern. The implications of these results with respect to device operation and design are discussed.

ISSN:0003-6951    

DOI:10.1063/1.1654370

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Single‐frequency operation of a cw pumped Nd:YAG laser was achieved by using a ring cavity configuration containing a small differential loss. The resulting unidirectional traveling wave eliminated spatial hole burning, and the output of the laser was at a single frequency.

ISSN:0003-6951    

DOI:10.1063/1.1654371

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The effect of adding vibrationally ``cold'' CO to a CO chemical laser is shown to increase the inversion ratios on the vibration levels of the chemically formed molecules. This fact is demonstrated experimentally by the observation ofR‐branch emission, reported here for the first time in any cw flow and mixing chemical laser.R‐branch lines can be seen experimentally only with the addition of cold CO, and then only with a frequency‐selective optical cavity. Theoretical calculations indicate that the total inversions predicted from the known distribution of the O + CS pumping reaction are rapidly depleted by vibration‐vibration (VV) relaxation. The collisional VV exchanges with cold CO are shown to increase the vibrational inversion ratios to the extent that total inversion is observable in experimental devices limited by mixing and reaction times that are not fast compared with VV equilibration.

ISSN:0003-6951    

DOI:10.1063/1.1654372

出版商:AIP    

年代:1972

数据来源: AIP