摘要:

Continuous wave lasing operation with the shortest wavelength for semiconductor lasers was obtained from AlGaInP double heterostructure lasers at 77 K. The structure was grown by metalorganic vapor phase epitaxy. Lasing wavelength was 583.6 nm (yellow). Threshold current was 43 mA (1.9 kA/cm2). Magnesium was adopted as ap‐type dopant, and was proved to be preferable for a high aluminum composition AlGaInP cladding layer.

ISSN:0003-6951    

DOI:10.1063/1.96505

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

A novel laser is proposed for the two‐dimensional electrons in semiconductor heterostructures in strong magnetic fields. The laser operates under the two‐dimensional Landau quantization with population inversion in the Landau levels. The laser frequency, which is directly tunable by the magnitude of the external magnetic field (H), falls on the far infrared forH∼1 T.

ISSN:0003-6951    

DOI:10.1063/1.96506

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

ActiveQswitching in a GaAs/AlGaAs multiquantum well laser with an intracavity electroabsorption monolithic loss modulator is demonstrated. In this device, an efficient loss modulation is achieved through the quantum confined Stark effect in a modulator section and the enhanced carrier induced band shrinkage effect in an optical amplifier section. It is found that a picosecond pulse as narrow as 18.6 ps full width at half‐maximum is generated and a high repetition rate of more than 3 GHz is obtained.

ISSN:0003-6951    

DOI:10.1063/1.96507

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

Optical one‐way, real time wave front cleanup by means of photorefractively pumped oscillators is reported. A factor of 4000 increase in beam brightness has been achieved.

ISSN:0003-6951    

DOI:10.1063/1.96508

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

Novel electro‐optic devices using the polarization‐, intensity‐, and frequency‐dependent susceptibility of Stark‐active gases have been analyzed and demonstrated, including all‐optical limiter/cut‐off devices, amplitude modulators, and tunable narrowband filters. The application of the system to other media (e.g., multiple quantum wells) and to the study of coherent optical transients is discussed.

ISSN:0003-6951    

DOI:10.1063/1.96509

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

Techniques are described for phase locking two or more lasers using phase‐conjugating mirrors. Any changes in the optical cavity length or in the spatial mode structure of the optical beams are automatically compensated. Two argon‐ion lasers were locked using a photorefractive crystal of BaTiO3acting as a self‐pumped phase‐conjugating mirror.

ISSN:0003-6951    

DOI:10.1063/1.96469

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

The transmission of guided waves through a thin‐film waveguide with an oriented liquid‐crystal cladding of K18 exhibits, near the liquid‐crystal nematic–isotropic phase transition, a number of all‐optical operations, such as switching and bistability.

ISSN:0003-6951    

DOI:10.1063/1.96470

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

A method for measuring angular distributions of sputtered particlesinsituunder ultrahigh vacuum conditions has been developed. It is based on a simultaneous collection of the ejected atoms on a number of quartz crystal microbalances (QCM’s), arranged in a semicircular pattern. Furthermore, it is possible to monitor the chemical state of the surface of the QCM’s and to register the amount of deposited material by means of Auger electron spectroscopy. By this method the time evolution of the angular distribution can be followed from quartz crystal coverages in the submonolayer regime to depositions corresponding to many monolayers.

ISSN:0003-6951    

DOI:10.1063/1.96471

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

The feasibility of ion channeling through the wall of a thin Si‐liquid cell has been investigated. We have shown experimentally that it is possible to channel ions through a thin Si‐liquid interface. With water the channeling minimum yield is 0.45 at the interface. This is higher than that required for application of this technique to gain structural information at the solid‐liquid interfaces. It is also higher than that required for the determination of preferred positions of deposited impurity atoms at the interface.

ISSN:0003-6951    

DOI:10.1063/1.96472

出版商:AIP    

年代:1986

数据来源: AIP

摘要:

Al‐Mn alloy particles prepared by evaporation of an Al‐10 at. % Mn alloy in He gas have been found to exhibit the same diffraction pattern reported for a melt‐spun Al6Mn icosahedral quasicrystal. An x‐ray energy dispersive analysis shows a Mn content of about 24 at. %.

ISSN:0003-6951    

DOI:10.1063/1.96473

出版商:AIP    

年代:1986

数据来源: AIP