A Raman source has been constructed and tested using a helical mercury lamp of the “Toronto” type. Studies of intensity <i>versus</i> mercury pool condenser temperature and <i>versus</i> lamp current indicate that a condition of maximum stability can be obtained by proper choice of current and condenser temperature. To aid in starting and to increase the efficiency of the lamp, a special lamphouse has been designed. The complete unit then provides stable, high intensity, mercury radiation at 4358A. Ratios of 4347A, 4339A, and background to 4358A are approximately 0.008, 0.002, and 0.0005, respectively. Background was measured at 4369A (45 cm<sup>-1</sup> shift) and represents a maximum possible value.
J. W. KEMP, J. L. JONES, and R. W. DURKEE, "A Source Unit for Raman Spectroscopy," J. Opt. Soc. Am. 42, 811-812 (1952)