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Measurements of Spontaneous Raman Scattering with Nd:YAG 1064-nm Laser Light

Volume 40, Number 2 (Feb. 1986) Page 137-139

Fujiwara, M.; Hamaguchi, H.; Tasumi, M.

Conventional Raman measurements are performed with various laser lines in the visible region. Recently more interest has been directed toward the use of ultraviolet laser lines, which are exactly or nearly in resonance with electronic absorptions of a wider range of compounds. Then, what about the use of near-infrared laser light? Obviously, the use of a near-infrared laser line for Raman excitation has a drawback which is manifested in the v4 rule; the absolute intensity of a Raman band at 1000 cm−1 measured with the Nd:YAG 1064-nm line is only 3.4% of that measured with the Ar+ 488.0-nm line, provided that the power of each laser line is equal. Furthermore, detectors available for the near-infrared region do not seem comparable with photomultipliers or intensified diode-array detectors normally used for Raman measurements in the visible and ultraviolet regions. However, Raman excitation with a near-infrared laser line is still attractive as a possible means of solving the problem of "fluorescence," which frequently hinders Raman measurements. Following a Japanese saying similar to "The proof of the pudding is in the eating," we are trying to examine this possibility. Our preliminary results are reported below.