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Strontium vapor laser
A strontium vapor laser is a laser that produces at its output, high-intensity pulsed light at a wavelength of 430.5 nm in the blue-violet region of the visible spectrum via vaporized strontium metal gas contained within a glass tube.
== History ==
Laser action on two of the infra-red transitions in Sr+ was first discovered in the Clarendon Laboratory, Oxford by Deech and Sanders as early as 1968.〔J.S. Deech and J.H. Sanders 1968 IEEE J.Quant.Electron. QE-4 474〕 Gain was measured over a 9 cm length of strontium vapor present in a 3 torr buffer gas of helium or neon and maintained at the correct temperature by an externally heated furnace. Three years later, twelve further infra-red laser transitions in neutral strontium were reported by Cahuzac.〔P.Cahuzac 1971 J.Phys. (Paris) 32 499〕 Again the heat needed to provide sufficient vapor pressure was produced by external means. The tubes used here were 5–10 mm in diameter and 75 cm in length. A 1.25 m cavity was used with mirrors of approximately 98% reflectivity.
In 1973, Latush and Sém from Rostov-on-Don State University, Russia, observed visible laser action from the strontium vapor laser for the first time, at wavelengths of 430.5 nm and 416.2 nm.〔E.L.Latush and M.F.Sém 1973 Sov.J.Quant.Electron. 3(3) 216〕 The active volume was contained in a ceramic tube 8 mm in diameter and 60 cm long. Small pieces of strontium were placed inside the tube at equally spaced intervals and the necessary vapor pressure was produced by externally heating the assembly. Helium was used as the buffer gas, at pressures ranging from 2.5–35 torr. Output power was found to increase with increasing buffer gas pressure.
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