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A LED is a long-lived light source, but certain mechanisms can cause slow loss of efficiency of the device or sudden failure. The wavelength of the light emitted is a function of the band gap of the semiconductor material used; materials such as gallium arsenide , and others , with various trace doping elements , are used to produce different ...
The RV-3 (and, later, the RV-4) also contained a speaker. Beginning with the TR-3, Drake adopted a scheme for illuminating tuning dials and panel meters on its equipment using small incandescent bulbs behind greenish-blue transparent plastic filters. This lighting color became one of the most recognizable and distinguishing features of Drake ...
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Infrared optical parametric oscillator. An optical parametric oscillator (OPO) is a parametric oscillator that oscillates at optical frequencies. It converts an input laser wave (called "pump") with frequency into two output waves of lower frequency (,) by means of second-order nonlinear optical interaction.
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