The 213 nm laser wavelength is generated by combining the first and the fourth harmonic by means of a 5^th harmonic generator. Wavelength separation is obtained by means of a “Pellin-Broca” prism after which all unnecessary radiations are dumpered (Figure 3). Using mirrors, the 213 nm laser beam is carried into a petrographic microscope, focused above the sample, and then projected onto it. 

Figure 1. 213 nm laser configuration.

Figure 2. Layout of the 213 nm laser configuration.

Figure 3. 213 nm laser wavelenght generation and separation.

The laser power is controlled by an optical attenuator consisting of a rotatable zero-order half-wave plate, a high power UV prism and a beam dump. The spot size can be varied by changing the sample position below the focus point of the laser or adding a diaphragm on the laser path. The maximum output energy at 213 nm is about 0.4 mJ/pulse.

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