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For Students · Laser Cavity

Laser Cavity for a fiber sensor

Built for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition. Simulate a fiber sensor live below — adjust the inputs and watch it respond, right in your browser.

Laser CavityLive

gain, loss & threshold

Controls

Presets

Pump power

Cavity loss

A laser fires only when the optical gain from the pumped medium exceeds the losses of the mirror cavity. Below that threshold it merely glows like a lamp; above it, stimulated emission takes over and output rises steeply and linearly with pump power. This sharp threshold is the defining signature of laser action.

▶ Run in Python

Data Inspector

Threshold2.0

Output power1.60

Statelasing

Governing equation

P_{out} = 0.8 max (P_{pump} - P_{th}, 0) = 0.8 max (4 - 2.0, 0) = 1.60

Reading this result: Well above threshold, output climbs almost linearly with pump; the slope (~0.8 here) is the slope efficiency, and lowering cavity loss shifts the whole knee left.

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Frequently asked questions

Is this good for students?: Yes — this version of "Laser Cavity for a fiber sensor" is framed for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.