摘要:

Hyperfine structure in a molecular beam of I2has been observed with a resolution of one part in 109using a stable jet stream cw dye laser. In addition, the dye laser was long‐term stabilized to six parts in 1013by using an I2molecular beam reference.

ISSN:0003-6951    

DOI:10.1063/1.1655286

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

The presence of a shallown‐type surface layer on ap‐type substrate is shown to increase the effective height of a Schottky barrier top‐type material. The effective barrier height of Ni&sngbnd;Si diodes has been increased by an amount in the range 0–0.25 eV using surface layers formed by low‐energy antimony implantation.

ISSN:0003-6951    

DOI:10.1063/1.1655287

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

An extinction technique is described for obtaining high‐contrast images while effectively increasing sensitivity in photodichroic alkali halide crystals.

ISSN:0003-6951    

DOI:10.1063/1.1655288

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Experiments were performed with electron‐beam‐pumped Ar&sngbnd;N2mixtures. Laser emission on the second positive band transitions 3577 Å (0–1) and 3805 Å (0–2) was observed in an optical cavity fitted with Brewster angle windows. Some exciting preliminary experiments in which the laser windows were mounted at normal incidence were performed. These results indicated superfluorescent emission with an efficiency of 0.4%. The energy pathways in the irradiated mixtures were modeled and compared to the experimental results.

ISSN:0003-6951    

DOI:10.1063/1.1655289

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Experimental results are presented correlating the operating life of (AlGa)As heterojunction diodes with recombination region doping and Al concentration. For a given doping level, the operating life is shown to increase with the addition of Al. The relationship between spontaneous emission degradation and lasing properties has also been studied.

ISSN:0003-6951    

DOI:10.1063/1.1655290

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Electron beam excitation of pure Xe and Xe&sngbnd;Ar and Xe&sngbnd;Ne gas mixtures have been studied. Significant differences in the temporal character of ultraviolet output were observed. Under the best conditions laser output of 75‐MW peak power and 0.76‐J output energy were achieved. The molecular xenon laser is established as having the highest power in the wavelength region short of red.

ISSN:0003-6951    

DOI:10.1063/1.1655291

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Single picosecond pulses of a Nd:glass laser are used in a single‐pass generator to produce intense ultrashort infrared pulses. Starting from quantum noise, stimulated three‐photon parametric amplification over ∼12 orders of magnitude is achieved in a LiNbO3crystal at a pump intensity of 1010W/cm2. Angular tuning provides a frequency range of 2500–7000 cm−1. High conversion efficiencies exceeding 1% are measured without crystal damage.

ISSN:0003-6951    

DOI:10.1063/1.1655292

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

H2and HBr are compared as cavity fuels in a 1‐kW arc‐driven cw HF chemical laser. Closed‐cavity power is presented as a function of fuel flowrate and lasing‐axis position. Peak power observed was ∼350 W with HBr, ∼600 W with HBr and He, and ∼1100 W with H2. Spectral content of the laser beam indicated dominant 1–0 and 2–1 vibrational transitions with H2, and 2–1 and 3–2 transitions with HBr.

ISSN:0003-6951    

DOI:10.1063/1.1655293

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

n‐n+‐nepitaxial triple layers were grown by liquid phase epitaxy to fabricate lo‐hi‐lo GaAs IMPATT devices. The best diode gave 35.6% cw efficiency with 2.9‐W output power at 10.4 GHz. From a group of 151 devices, 51% had better than 22% efficiency with an average output power of 2.8 W at 10 GHz. Operating voltages varied between 40 and 55 V. A theoretical efficiency of 46% was calculated for narrow spike structures using a quasistatic computer simulation.

ISSN:0003-6951    

DOI:10.1063/1.1655294

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

C‐15 crystal‐type Laves phase compounds, V2HfxZr1−x, were fabricated into a tape by a composite process in which the Laves phase layers were formed by the diffusion between the vanadium sheath and the HfxZr1−xalloy core. In the composition range 0.4 ⩾x⩾ 0.3, the composite tape showed the maximum values of superconducting transition temperature, upper critical field, and critical current density. The critical current of the tape did not degrade by winding into coils with diameters larger than 20 mm.

ISSN:0003-6951    

DOI:10.1063/1.1655295

出版商:AIP    

年代:1974

数据来源: AIP