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Rocky Mountain Instruments - Infrared Optics LB

Amplifier Enhances Ringdown Spectroscopy

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Breck Hitz

In recent years, investigators have adapted the principles of ringdown spectroscopy (see sidebar, facing page) to fiber optic configurations by placing high reflectors on each end of a fiber and observing the ringdown time of an injected pulse. But a major drawback is the difficulty of creating a low-loss, high-Q resonator in an optical fiber. Figure 1. A pulse injected from the distributed feedback laser (lower left) "rings down" as it passes repeatedly around the loop. An erbium-doped fiber amplifier (top) offsets losses in the micro-optic sample cell and elsewhere in the loop. Because...Read full article

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    Published: May 2004
    Glossary
    optical fiber
    Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light signals over long distances with minimal loss of signal quality. It serves as a medium for conveying information in the form of light pulses, typically in the realm of telecommunications, networking, and data transmission. The core of an optical fiber is the central region through which light travels. It is surrounded by a cladding layer that has a lower refractive index than...
    resonator
    A resonator is a device or system that exhibits resonance, which is a phenomenon that occurs when an external force or stimulus is applied at a specific frequency, causing the system to oscillate with increased amplitude. Resonators are found in various fields and can take different forms depending on the type of waves involved, such as mechanical waves, acoustic waves, electromagnetic waves, or optical waves. Key points about resonators: Resonance: Resonance is a condition where a...
    fiber optic configurationsfiber opticsinjected pulseoptical fiberResearch & Technologyresonatorringdown spectroscopyspectroscopy

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