摘要:

The successful operation of a synchronously pulsed high‐repetition‐rate ir up‐converter is reported. Using a 1.06‐&mgr;m Nd:YAG pump laser and a proustite (Ag3AsS3) nonlinear crystal, 10.6‐&mgr;m pulsed output from a CO2laser has been up‐converted to 0.964 &mgr;m with good conversion efficiency and high peak power obtained. Up‐conversion efficiency of 0.84% has been achieved, which generated peak power outputs of 8.4 W at 0.964 &mgr;m. This was accomplished at a repetition rate of 133 pps. Under these conditions, the beam of the up‐converted signal was easily imaged and clearly visible on an ordinary S‐1 surface‐image intensifier tube. Thus, real time imaging or electronic image processing of ir‐illuminated scenery should be possible using this mode of operation.

ISSN:0003-6951    

DOI:10.1063/1.1654422

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Efficient photoemission has been demonstrated from uniform large‐area arrays of field emitters, fabricated at densities of 106in.−2by microetching techniques inp‐type silicon. Such arrays were shown to emit electrons into vacuum when biased by a closely spaced plane anode (125‐ to 500‐&mgr;m spacing) at a few kilovolts. No high‐vacuum cesiation or high‐temperature cleaning is required to observe this emission.Stablereflective photosensitivities exceeding 1500 &mgr;A/lm and quantum efficiencies of 2% at 1.06 &mgr;m and 28% at 0.90 &mgr;m have been demonstrated in thickp‐type silicon arrays.

ISSN:0003-6951    

DOI:10.1063/1.1654423

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The photosensitivity of thin silicon field‐emitter array structures has been investigated in transmission over the 0.4‐ to 1.1‐&mgr;m spectral region. Quantum yields of 45% at 0.90 &mgr;m and 0.5% at 1.06 &mgr;m have been measured at 90 °K. Image formation at wavelengths longer than 0.85 &mgr;m with a resolution approaching 10 line pairs/mm has been demonstrated with prototype 30‐mm‐diam target structures. It is also shown that large‐area avalanche multiplication of carriers may be used without significant image degradation.

ISSN:0003-6951    

DOI:10.1063/1.1654424

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Measurements at frequencies above 200 MHz have been made of the coupling factor, phase velocity, and propagation loss of dc‐triode‐sputtered zinc oxide film layers on oxidized silicon and fused quartz. Values of 2.2% have been obtained fork2. Propagation losses of 8.0 dB/&mgr;sec were observed at 630 MHz. The measurements strongly suggest that sputtered zinc oxide films can be obtained whose quality approaches very closely that of single‐crystal zinc oxide.

ISSN:0003-6951    

DOI:10.1063/1.1654425

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

New highly transparent liquid‐crystal light valves for the recording, storage, and display of high‐resolution graphic images in projection displays are described. Information is recorded in these light valves by anx‐ydeflected intensity‐modulated ir laser beam which locally heats visually transparent infrared absorbing electrodes. The resulting temporary heating of the cholesteric liquid crystal creates light‐scattering centers that remain stored until erased electrically. Resolution is 50 lines/mm over a 4×4‐cm area. Contrast is better than 10:1. Addressing speed is higher than 104picture elements/sec for a few mW of 1.06‐&mgr;m YAlG laser power.

ISSN:0003-6951    

DOI:10.1063/1.1654426

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

We report for the first time switching and modulation of light in a magneto‐optic waveguide that is a single‐crystal epitaxially grown iron‐garnet film. These experiments involve the Faraday rotation of the magnetic film and the motion of magnetization in the plane of the film. We have modulated light from a 1.152‐&mgr;m laser up to 80 MHz. We were also able to switch light between two waveguide modes by applying a magnetic field as small as 0.2 Oe.

ISSN:0003-6951    

DOI:10.1063/1.1654427

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Thin Ti&sngbnd;Au films on sapphire were powered using pulsed dc. The incidence of electromigration damage is a complex function of pulse duration and repetition rate. For a given total ``exposure'' (fixed current density for a fixed total on‐time) the damage may be reduced or eliminated by using duty cycles less than 100%.

ISSN:0003-6951    

DOI:10.1063/1.1654428

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

It is possible under some restrictive conditions on the choice of dielectric materials to show and measure Kerr effect at microwave frequencies. The quadratic Kerr law is verified and the Kerr constant is calculated in the X‐band for tri‐o‐cresylphosphate and cyclohexanol.

ISSN:0003-6951    

DOI:10.1063/1.1654429

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Efficient second‐harmonic generation of light, where the wave‐vector‐matching condition is satisfied noncollinearly or two‐dimensionally, has been observed using a Nd:YAG laser as a fundamental and LiIO3as a nonlinear crystal. The phase‐matching condition has been found to be satisfied in a wide range of the angle around the optic axis of the crystal.

ISSN:0003-6951    

DOI:10.1063/1.1654430

出版商:AIP    

年代:1972

数据来源: AIP