摘要:

Rapid degradation has been observed for InGaAsP/InP double heterostructure lasers. It has been found that the rapid degradation is due to ⟨110⟩ dark line defects generated parallel to the stripe and its occurrence depends on the thickness of the InGaAsP contact layer. It has been shown that formation of a InGaAsP contact layer of more than 0.5‐&mgr;m thickness is necessary in order to realize high reliability of the lasers.

ISSN:0003-6951    

DOI:10.1063/1.92979

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A new pumping scheme was designed for a laser oscillator of a longitudinal electron beam pumped high power laser. In this system, an annular electron beam was converged and guided along the optical axis by a carefully shaped magnetic field which enabled a total reflector of the optical cavity to be placed on the optical axis. For KrF laser oscillation, the output energy and efficiency were 5 J and 4%, respectively.

ISSN:0003-6951    

DOI:10.1063/1.92980

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A far‐infrared dielectric waveguide laser has been decoupled from the pump laser by the use of rooftop mirrors as the cavity reflection elements. A concomitant increase in the pump and far‐ infrared output stability has resulted. Further, a new type of polarization behavior has been observed; the far‐infrared output is circularly polarized with opposite helicities above and below line center. This behavior is independent of both the pump polarization and the molecular selection rules of the particular line in question.

ISSN:0003-6951    

DOI:10.1063/1.92981

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Laser marking of thin organic films on reflective substrates involves three general physical processes—optical absorption, heat flow, and mass motion—all of which can proceed on nanosecond time scales. We report observations of pit morphology and discuss the contributions of these processes to pit formation.

ISSN:0003-6951    

DOI:10.1063/1.92957

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Exact solutions of the linearized transient envelope equations for degenerate four‐wave mixing in a finite‐length cell show that reflection coefficients near unity severely restrict the conditions under which chirp reversal occurs, and can lead to nulls in the amplitude of the reflected and transmitted fields.

ISSN:0003-6951    

DOI:10.1063/1.92982

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

We have measured the absolute quantum efficiency (QE) of fluorescence from the Na‐Hg vapor excited by Hg (253.7 nm) resonance radiation. The measurements were carried out as a function of Na mole fraction (XNa) in the Na‐Hg solid amalgam (XNa= 0–100%) and temperature (T= 200– 550 °C). Highest efficiency obtained was 115±15% forXNa= 0.76 andT= 325–375 °C. We believe these to be the first quantum efficiency measurements in gas phase systems where QE≳100% is observed.

ISSN:0003-6951    

DOI:10.1063/1.92983

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A new concept for matrix addressing a bistable nematic liquid crystal display with a potential writing capacity of several hundred lines per second is described. The bistability of two optically differentiable configurations provides permanent memory without refresh. The use of uniform electrodes provides a switching threshold that is very sharply defined and suitable for large scale multiplexing. Erasure is achieved by selectively heating any row to a temperature above the clearing point and allowing preferential relaxation to the lower energy configuration. The pulse switching characteristics of ’’writing’’ and the thermal properties of ’’erasure’’ are described. The physical processes involved and their implications for display applications are discussed.

ISSN:0003-6951    

DOI:10.1063/1.92958

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A new type of semiconductor laser is studied, in which injected carriers in the active region are quantum mechanically confined in two or three dimensions (2D or 3D). Effects of such confinements on the lasing characteristics are analyzed. Most important, the threshold current of such laser is predicted to be far less temperature sensitive than that of conventional lasers, reflecting the reduced dimensionality of electronic state. In the case of 3D‐QW laser, the temperature dependence is virtually eliminated. An experiment on 2D quantum well lasers is performed by placing a conventional laser in a strong magnetic field (30 T) and has demonstrated the predicted increase ofT0value from 144 to 313 °C.

ISSN:0003-6951    

DOI:10.1063/1.92959

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

We report a new lateral selective‐area growth by liquid‐phase epitaxy with the preparation of a new buried‐heterostructure laser, the lateral double‐barrier buried‐heterostructure (DBBH) laser, as an illustrative example. The DBBH laser so prepared operated in a stable clean fundamental mode with reduced optical scattering losses due to sidewall roughness of the etched mesa. Pulsed operation was achieved at temperatures as high as 280 °C. This new selective‐area growth can also be used to form guided wave integrated microlens systems.

ISSN:0003-6951    

DOI:10.1063/1.92960

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A multiline injection mode locked transversely excited atmosphere CO2laser has been operated for use in high intensity laser‐plasma interaction experiments. Laser pulses of 390 MW and 2‐ns duration with up to three equal power lines were produced by installing intracavity SF6cells in both the injection and slave oscillators to tune them to the desired laser transition. A simple model defines the laser system requirements to achieve simultaneous oscillation on several lines.

ISSN:0003-6951    

DOI:10.1063/1.92961

出版商:AIP    

年代:1982

数据来源: AIP