Showing papers on "Energy conversion efficiency published in 1969"
TL;DR: In this article, the power conversion efficiency for green emission from BaYF5:Yb3+, Er3+ is equal to that for green emitting GaP diodes.
Abstract: Efficient infrared‐to‐visible conversion by Yb3+–Er3+ and Yb3+–Ho3+ ions in BaLuF5 and BaYF5 is reported. When pumped by radiation from a Si–GaAs diode, the power conversion efficiency for green emission from BaYF5:Yb3+, Er3+ is equal to that for green emitting GaP diodes.
103 citations
TL;DR: In this paper, the operation of an optical parametric oscillator which is directly pumped by the 1.06μ output of a continuously pumped, repetitively Q-switched Nd:YAG laser is described.
Abstract: The operation of an optical parametric oscillator which is directly pumped by the 1.06‐μ output of a continuously pumped, repetitively Q‐switched Nd:YAG laser is described. The oscillator uses a 3‐mm lithium niobate crystal in a non−90° orientation as the nonlinear material. 17 mW of average output power at 2 μ have been obtained giving an oscillator conversion efficiency of 8%. Measurements are also reported of pump power threshold, pump depletion, and wavelength tuning of the oscillator. No optically induced index inhomogeneities were observed in the lithium niobate.
27 citations
01 Dec 1969
TL;DR: In this paper, the p/sup +/-n-n/sup +/ diodes were mounted in a coaxial line resonator and the normalized (gain)/sup 1/2/ X bandwidth product was 12 percent.
Abstract: Silicon diodes pulse operated in avalanche resonance pumped modes have produced stable microwave amplification with up to 25 percent dc to RF conversion efficiency. The p/sup +/-n-n/sup +/ diodes were mounted in a coaxial line resonator. Under conditions of self-generated pump signals at or close to the avalanche resonance frequency between 8.8 and 10.4 GHz, a low-power gain of 19, 20, end 16 dB was measured at 1.3, 3.2, and 4.4 GHz, corresponding to the seventh, second, and first subharmonic. At 1.3 GHz, a high-power gain of 12 dB resulted in a dc to RF conversion efficiency of 25 percent. The normalized (gain)/sup 1/2/ X bandwidth product was 12 percent. Amplifier saturation related to decreasing pump amplitudes is reported.
12 citations
01 Apr 1969
TL;DR: In this paper, the theory of the pyroelectric effect is presented, and it is shown that the detector element can be treated as a capacitor with a power-proportional current source.
Abstract: : The theory of the pyroelectric effect is presented, and it is shown that the pyroelectric detector element can be treated as a capacitor with a power-proportional current source. An electrical equivalent circuit is developed which, in combination with a thermal equivalent circuit, completely describes the response of a detector to any power input. The modes of operation of the detector are discussed and the geometric and material properties affecting the conversion efficiency are delineated. The techniques used in fabrication and testing the detectors are described. For several poled ceramics the current responsivities were determined with a carbon dioxide laser. In addition, the detectors were used with other lasers, and operational results with power levels from 5 mW to 30 MW are presented. (Author)
3 citations
TL;DR: The dependence of calculated static space-charge-induced negative resistance, in avalanching silicon diodes, upon the form of the ionization rate function is investigated in this paper.
Abstract: The dependence of calculated static space-charge-induced negative resistance, in avalanching silicon diodes, upon the form of the ionization rate function is investigated. It is shown that the conversion efficiency calculated using a commonly employed function for the ionization rate is greatly overestimated. It is concluded that the mechanism of static space-charge-induced negative resistance is not the origin of high efficiency modes of oscillation.
3 citations
TL;DR: A relation for the photon-magnon conversion efficiency in axially magnetized garnet delay line has been developed which is independent of the saturation magnetization and depends on the position of the turning point as mentioned in this paper.
Abstract: A relation for the photon-magnon conversion efficiency in axially magnetized garnet delay line has been developed which is independent of the saturation magnetization and depends on the position of the turning point. Calculations have been made for the various positions of the turning point. The calculated result agrees with the experimental value.
2 citations
05 May 1969
TL;DR: In this paper, the authors obtained microwave amplification from silicon diodes operated in avalanche resonance pumped modes at 1.3 GHz for a saturation gain of 12 dB and a bandwidth of 3%.
Abstract: Microwave amplification has been obtained from silicon diodes operated in avalanche resonance pumped modes. DC to RF conversion efficiency was 25% at 1.3 GHz for a saturation gain of 12 dB and a bandwidth of 3%. A nonlinear theory predicts a large dynamic range and efficiencies up to 70%.
2 citations
01 Apr 1969
TL;DR: In this paper, a 1.5-GHz CdS transducer with optical illumination has been shown to achieve 11dB change in the two-way conversion efficiency of a CCDS transducers.
Abstract: As much as 11-dB change in the two-way conversion efficiency of a 1.5-GHz CdS film transducer has been produced by means of optical illumination. Possible applications to acoustic beam scanning are discussed.
2 citations
TL;DR: In this article, the Schottky barrier diodes on barium titanate were used to generate photocurrents generated in Schottkky barrier Diodes for photon-to-electron conversion.
Abstract: Observation of photocurrents generated in Schottky barrier diodes on barium titanate, suggesting practical utility of photon-to-electron conversion efficiencies