Power stability, linewidth, beam quality

MRL-FN-721-SM721 nm red CW laser

721 nm

The MRL-FN-721-SM is a precision 721 nm CW laser delivering 1~500 mW output power. View technical specifications and request the full datasheet from Precisometer.

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Specifications

MRL-FN-721-SM

2 specification rows

Wavelength	721 nm
Output / average power	1~500 mW
Beam / notes	SM Fiber output laser

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Model selection

Nearby series comparison

Compare MRL-FN-721-SM with the closest available models in the CW Lasers family.

Selection parameter	MRL-FN-721-SM (current)	MSL-FN-721	MSL-R-721
Wavelength	721 nm	721 nm	721 nm
Optical power / pulse energy	1~500 mW	1~300 mW	300~1000 mW

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Choosing a laser

Guides that put this laser in context

Which specifications decide the experiment, and which ones cost money without changing the result.

Laser emission spectrum, intensity noise traces, and beam quality profiles illustrating the main laser specifications

13 min Spec lab

Laser specifications decoded

Linewidth, spectral width, RIN, M², and coherence length answer five different questions. Translate each into the units your experiment is designed in — and learn which ones not to pay for.

Low-noise laser head and controller of the type specified for optical trapping

Optical trapping

16 min 2 simulations

Choosing a laser for optical tweezers

Why wavelength is decided by photodamage, focal heating, and detector bandwidth rather than trapping force — and what laser noise costs you in piconewtons.

Fluorescently labeled cells in a sharp confocal focal plane

Confocal microscopy

14 min Design lab

Designing a confocal fluorescence excitation system

Connect fluorophores, pinhole size, Airy units, spatial sampling, scan timing, modulation, and power after the fiber in one practical design workflow.