Air-cooled argon ion laser

The Raman spectrometer is equipped with a Peltier-cooled charge-coupled device (CCD) detector, together with a laser which can be selected depending on the application. The 25-mW air-cooled argon ion laser (Spectra Physics) lasing at 514 nm is the most versatile for gemstone work. 

A C.W. 100 mW air-cooled argon-ion lasCT run in the multiline mode was the excitation source. The excitation wavelength wass 514 nm, and was selected with an interference filte. Relative laser power was selected using neutral density filtos. 

Argon-ion lasers are CW gas lasers whose emission is composed of multiple wavelengths in the green-blue-violet range. Air-cooled models emitting up to 300 mW and water-cooled models emitting up to 10 W are quite common in labs for LDA use. They can also be used for PIV experiments in low-speed hquid applications, in conjunction with shutters or rotating mirrors. 

A. Laser head An Omnichrome Model 532 air-cooled single line argon ion gas laser operating at 514.5 nm. 

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