Reading a Laser Datasheet: Guaranteed vs Typical

A datasheet that says "up to 4 km" tells you almost nothing. What matters is which numbers are guaranteed, at what temperature, and under what test condition.

Three kinds of number

Minimum values are the ones a supplier will stand behind. If the sheet says pulse energy ≥ 100 µJ, every unit should meet it, within the stated conditions.

Typical values describe a representative part, not a promise. They're useful for predicting average behaviour and useless for a worst-case budget.

Maximum values are limits: drive pulse, current, temperature. Exceed them and the other numbers stop applying.

When a sheet mixes the three without saying which is which, assume the good number is typical.

Range is the worst offender

Range depends on target reflectivity, size, atmospheric visibility and detection probability. A figure without those attached is a marketing number. Our own product pages state the condition, and if the condition doesn't match your case, ask for the curve.

Look for the conditions column

Pulse energy at 25 °C is not pulse energy at −40 °C. Divergence assumes a given drive and a given output coupling. Beam quality assumes alignment that survived shipping. The conditions are where the honest information lives.

What to ask for

Test data for the parameter that matters most to you, at the temperature you'll run it at, with the drive you'll use. If the supplier can't produce it, you're reading a brochure.

One more thing: check that the test method is stated. Pulse energy measured with a slow detector and one measured with a fast one are different numbers.

Ask for test data on a specific model

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