High resolution infrared measurements of the OH- bands in KTiOPO4

Theis, William M.; Norris, George B.; Porter, Marc D.
June 1985
Applied Physics Letters;6/1/1985, Vol. 46 Issue 11, p1033
Academic Journal
High resolution infrared transmission measurements were performed at 10–300 K on KTiOPO4 crystals grown by hydrothermal or flux methods. The previously reported low resolution OH- band at 2.8 μm resolved into more than 100 lines. The strongest line was identified as a pure OH- stretch which broadened as T2, whereas lines which broadened as T1 were attributed to combinations with librations or other vibrational transitions. Although the integrated OH- related absorption strengths for several crystals were equivalent (±10%), the relative absorption strengths for various groups of lines scaled together and correlated with frequency doubling efficiencies; this indicated the possible occupation of several nonequivalent OH- sites in the lattice. Thus, only a portion of the OH- impurity was detrimental to the nonlinear polarizability.


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