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Source: ResearchGate
Understanding Parametric Fluorescence in Optical Parametric Amplifiers
An optical parametric amplifier can exhibit parametric fluorescence, which is the emission of light even in the absence of a signal and idler input. This phenomenon, rooted in quantum mechanics, is caused by vacuum fluctuations of the optical field entering the device’s open input ports. In a non-degenerate parametric amplifier, vacuum noise affects both the signal and idler ports similarly.
Comparison to Spontaneous Emission
Parametric fluorescence is akin to spontaneous emission in a laser amplifier but relies on parametric amplification. It predominantly occurs in directions where phase matching is achieved, carrying minimal optical power unless intense pulsed pumping leads to significant parametric gain. Non-collinearly phase-matched off-axis parametric fluorescence may also occur, with the emitted light’s center wavelength varying based on the propagation direction.
Application in Alignment
Parametric fluorescence can aid in aligning a non-collinear parametric amplifier by indicating the direction of maximum parametric gain, determined by phase matching. This feature facilitates the optimization of the amplifier’s performance.
Exploring Further
For those interested in optical parametric generators and related products, various suppliers offer solutions tailored to specific needs. These products leverage advanced technologies to enable efficient generation of mid-IR wavelengths from visible and near-IR sources, catering to applications such as spectroscopy.
Source: Wikipedia
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