532 nm Laser Module

Where 532 nm lasers are used

532 nm is the most widely used line in analytical optics, and for a simple reason: Raman scattering scales with the fourth power of frequency, so green excitation delivers far more signal than anything in the near infrared. Silicon detectors are at their most sensitive here, and the body of published reference spectra is larger than for any other wavelength.

• Raman spectroscopy. The default for inorganics, minerals, carbon materials, catalysts and semiconductors.
• Holography and interferometry. Our narrow line DPSS versions reach the coherence length these setups require.
• Flow cytometry. Excites phycoerythrin and the TRITC and Cy3 family.
• Particle image velocimetry. Strong scattering off seeding particles at modest power.
• Laser induced fluorescence. Covers the orange-red emitting dye range.

532 nm or a longer wavelength?

Stay at 532 nm as long as your sample does not fluoresce. For minerals, oxides, carbon and most semiconductors that is the case, and the signal advantage is large enough that nothing else makes sense.

Move to the 660 nm laser module or the 785 nm laser module as soon as organic content pushes a fluorescent background into the spectrum. If you need more signal still and your sample tolerates it, the 405 nm laser module goes further.