摘要:

A holographic grating at grazing angle of incidence was used to achieve tunable, narrow bandwidth (0.005 nm) operation of a XeCl oscillator for injection locking of a ring amplifier. The amplifier’s narrow bandwidth output energy was constant and equal to the untuned, broadband output (∼15 mJ) in regions where injection locking was achieved. Scanning was provided by use of a stepping motor‐driven differential micrometer on the tuning mirror. This system was used to produce a laser excitation spectrum of hydroxyl radicals (OH) in a flame.

ISSN:0003-6951    

DOI:10.1063/1.92918

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Continuous electrowetting (CEW) and refractive index matching have been used as the physical basis of an optical switch for multimode fibers. This switch has low cross talk (∼−30 dB), fast response times (∼20 ms), low operating voltage (∼1 V), and low power consumption (∼1 &mgr;W).

ISSN:0003-6951    

DOI:10.1063/1.92920

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

A hybrid electro‐optic oscillator is built up with an integrated Mach–Zehnder interferometer on LiNbO3and an electrical feedback circuit. Oscillation frequencies up to 1.54 GHz are achieved due to the high‐frequency properties of the modulator. Oscillator operation as well as the synchronization behavior are analyzed by the describing function technique.

ISSN:0003-6951    

DOI:10.1063/1.92929

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Optical information recording and storage is investigated in hydrogenated amorphous semiconductor films. The recording mechanisms are based on the evolution of hydrogen within the active layer. Three different processes are observed: (1) bulge (or bubble) formation, (2) spongelike microswelling, and (3) ablation without melting.

ISSN:0003-6951    

DOI:10.1063/1.92900

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Characteristics of our waveguides are very different than those reported earlier by Jackel. We shall show that the waveguiding is produced by a loss of Li atoms rather than a significant indiffusion of Tl.

ISSN:0003-6951    

DOI:10.1063/1.92915

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

The design and operating characteristics of a pulsed, rf‐excited CO2waveguide laser operated at gas pressures up to 10 atm are reported. The results of small signal gain and gain decay time‐constant measurements are also given.

ISSN:0003-6951    

DOI:10.1063/1.92916

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Lattice defect structure of degraded InGaAsP lasers has been investigated by scanning and transmission electron microscopy. It is found that although dislocation climb motion in InGaAsP lasers is slow, slip dislocations parallel to the stripe cause rapid degradation of the lasers.

ISSN:0003-6951    

DOI:10.1063/1.92917

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Data are presented demonstrating room‐temperature continuous (cw 300 K) photopumped laser operation of AlxGa1−xAs‐GaAs (x∼0.4) quantum well heterostructures (QWH) at wavelengths as short as &lgr;∼7270 A˚, or h&slash;&ohgr;−Eg(GaAs)∼280 meV. Photoexcitation levels on these six‐wellLz∼28 A˚ QWH’s have been as low as 5.6×103W/cm2orJeq∼2.3×103A/cm2, which is in a practical range for cw 300‐K diodes.

ISSN:0003-6951    

DOI:10.1063/1.92903

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Performance of a pulsed HF/DF chain laser was investigated for the case of transverse initiation by a magnetically confined electron beam. Laser energy and beam quality are presented as functions of electron gun, magnetic field, gas mixture, and optical resonator parameters. The results include 79‐J/l HF output and electrical efficiency for conversion of total incidente‐beam energy to laser output energy of 45%.

ISSN:0003-6951    

DOI:10.1063/1.92919

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

The operation of a new light modulation device that employs electric field controlled light scattering in an inhomogeneous medium is described. The orientation of a nematic liquid crystal, contained in micrometer sized inclusions in a nonabsorbing solid, is changed to produce a varying refractive index. When the refractive index of the liquid crystal matches that of the solid, the composite medium is nonscattering and transparent. If the refractive indices do not match, the medium is scattering and opaque. High contrast ratios have been measured for transmitted light with a response time of a ∼1 ms. The application of this technique to passive display devices is discussed.

ISSN:0003-6951    

DOI:10.1063/1.92904

出版商:AIP    

年代:1982

数据来源: AIP