Abstract
Operation of a high output power color center laser around 1.6 μm is reported using NaCl:OH -(F + 2) H or NaCl:S 2-(F + 2) H centers as active material. Stability under high pump power is achieved by use of a closed-loop helium refrigerator as a cooling system, and crystal slabs of 1 cm gain length as samples. The laser is tunable between 1.45 and 1.75 μm and provides an output power in excess of 4 W at 1.56 μm. A comparison between (F + 2) H centers obtained with oxygen and sulfur impurities seems to indicate a higher stability with sulfur as the only significant difference in laser performance.
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