> It's been so long since I used a dye laser (the 1980's) that I honestly can't > remember whether it used an etalon or a prism; In the old Spectra-Physics dye lasers we used birefringent filters in pulsed systems (where you have to allow a fairly broad band) and a combination of a tuning wedge with an etalon in continous- wave systems for Raman scattering (where you need a narrow line). But because the etalon gives several narrowly-spaced lines, we had to filter the laserline with a grating. But no doubt there are other options too. Emmanuel
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