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Each resonance is called a longitudinal mode.
Ultrasonic horns are tuned components designed to vibrate in a longitudinal mode at ultrasonic frequencies.
However, for oblique angle incident light, in addition to the TM mode, a longitudinal mode (LM) appears at longer wavelengths.
Block horns are tuned components designed to vibrate in a longitudinal mode at a low ultrasonic frequency.
To identify whether a resonance originates from a longitudinal mode or a transverse mode, well-aligned metal nanowires represent an ideal configuration.
For GNRs, two distinct plasmon bands, a transverse mode (~520 nm) and a longitudinal mode (usually >600 nm), can be observed.
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These beams are monochromatic for most practical applications; other optics can be added to limit laser oscillation to a single longitudinal mode and an even narrower range of wavelengths.
The VCSEL operates with a single longitudinal mode instead of multiple modes and therefore has an extremely narrow instantaneous linewidth which supports a long imaging range.
A single longitudinal mode emission is observed among the entire investigated temperature range with a side-mode suppression ratio (SMSR) 26 dB at high temperature of 90 °C.
For a correctly designed system, this mutual adaptation spontaneously forces the laser to oscillate on a single longitudinal mode.
Our devices provided a single longitudinal mode with the maximum CW output power up to 48.8 mW/facet at 971.31 nm at 250 mA without facet coating, 3dB linewidth (<3.2 pm) and SMSR (>39 dB).
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