摘要:

A ’’shadow deposition’’ technique using only optical lithography and conventional thin‐film technology has been used to fabricate titanium lines with nominal widths of 0.15–0.30 &mgr; on glass substrates. Each of these lines was produced by evaporating metal at an angle to a photoresist edge and utilizing the region ’’shadowed’’ from the evaporating atoms by the edge to form aninsitumask of submicron dimensions with highly correlated edges. Uniformly wide lines having tapered edges and widths less than 0.1 &mgr; appear to be reliably attainable with this technique. It is expected that the method will be useful for making Josephson junctions and other devices employing titanium, niobium, or any other material that can be vapor deposited.

ISSN:0003-6951    

DOI:10.1063/1.90586

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

By adding a small quantity of F2, the 3371‐A˚ (C3&pgr;u→B3&pgr;gsecond positive system)N2laser energy in the fast Blumlein discharge was increased 30% over that for N2alone. This value was obtained for a gas mixture of 4% added F2and 96% N2at a total pressure of 120 Torr.

ISSN:0003-6951    

DOI:10.1063/1.90587

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

An experimental investigation of the performance of an XeCl excimer laser operating with moelcular traps is reported. The effects of cold traps, active carbon, and molecular sieves on the lasing gas mixture has been tested in order to selectively remove contaminant reaction products which quence laser action. Best results have been obtained by using a 3‐A˚ molecular sieve directly inserted into the laser chamber. More than 180 000 shots have been obtained after 5 h of 10‐Hz laser operation with a single refill before the output power decayed to one‐half the initial value.

ISSN:0003-6951    

DOI:10.1063/1.90588

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

Low‐loss propagation of 10.6‐&mgr;m light has been demonstrated in hollow metal waveguides of rectangular cross section that undergo axial twists. These twisted waveguides can serve as efficient infrared polarization rotators, where greater than 90% transmission has been achieved at 10.6 &mgr;m for a 90° rotation. In addition, transmission of more than 200 W cw through flexible waveguides is reported here, confirming that these waveguides are potentially useful for steering high‐power infrared light beams.

ISSN:0003-6951    

DOI:10.1063/1.90589

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

A two‐junction cascade solar‐cell structure has been demonstrated in the AlGaAs/GaAs materials system. The cell consists of twop‐njunctions with different band gaps monolithically connected in series by means of a low‐resistancep‐njunction. An open‐circuit voltage of 2.0 V has been observed for this cascade structure. This is the highest open‐circuit voltage that has been reported for a single monolithic photovoltaic cell.

ISSN:0003-6951    

DOI:10.1063/1.90576

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

Efficient extraction of chemically generated O2(1&Dgr;) energy has been obtained in a trasverse‐flow oxygen‐iodine laser. The measured power extraction efficiency with off‐optimal outcoupling was 15%. Output powers in excess of 100 W were obtained for periods of up to 3 min.

ISSN:0003-6951    

DOI:10.1063/1.90590

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

The surface microstructure and chemical constituency of solar‐absorbing black chrome films have been studied by scanning electron microscopy (SEM), x‐ray photoemission spectroscopy (XPS), and sputter depth‐profiling techniques. The films have been determined to consist of a top layer of small (∼400 A˚) Cr2O3particles with one or two sublayers of larger (∼1000 A˚) closely packed chromium particles. In addition, it has been shown that the optical response of the particulate black chrome films is significantly determined by the microstructure of the films.

ISSN:0003-6951    

DOI:10.1063/1.90591

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

Stable unidirectional ring laser oscillation of optically pumped dimer molecules is reported. In the case of Na2, single‐frequency output powers up to 200 mW tunable over a range of 4 GHz were obtained. By means of oscillator amplifier systems the forward‐backward amplification profiles and the level splitting due to the dynamic Stark effect were measured.

ISSN:0003-6951    

DOI:10.1063/1.90592

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

Surface analyses combined with barrier‐height studies indicate that Cu2O Schottky barriers made with low‐work‐function metals (Yb, Mg, and Mn) are essentially Cu/Cu2O cells due to reduction of the Cu2O surface and subsequent interdiffusion phenomena. The copper‐rich region essentially determines the barrier height. As a result, efficiencies of Cu2O Schottky‐barrier solar cells are usually less than 1%. It is concluded that to achieve significant increases in Cu2O cell efficiencies, MIS or heterojunction device structures must be utilized.

ISSN:0003-6951    

DOI:10.1063/1.90593

出版商:AIP    

年代:1979

数据来源: AIP

摘要:

This letter reports the first realization of backside‐illuminated HgCdTe/CdTe photodiodes prepared by a liquid‐phase‐epitaxy technique. The thermal noise of these diodes is lower than that of bulk HgCdTe diodes fabricated under otherwise similar conditions. This is explained by an analytical model based on material parameters and the geometry ofn+‐pdiodes.

ISSN:0003-6951    

DOI:10.1063/1.90595

出版商:AIP    

年代:1979

数据来源: AIP