Frequency-doubled diode laser for ultraviolet absorption spectroscopy at 325 nm

A frequency-doubled tunable diode laser for absorption spectroscopy in the ultraviolet is described. The device is based on an external cavity diode laser with a transmission grating. Second-harmonic generation at 320–327 nm is carried out using a lithium iodate crystal. The measured single-pass cw ultraviolet power is 60 nW and the system has a 40-GHz continuous mode-hop-free tuning range in the ultraviolet. The laser was demonstrated by measuring the 324.75-nm 42S1/2–42P3/2 transition of copper at atmospheric pressure with a single continuous scan.

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