Combining a diode laser with ad vanced electrooptical components will provide the best instrument perform ance. For example, the dimension and the weight of the diode laser spectrom eter are now limited by the detector, that is, a photomultiplier and its power supply. Replacement with a sensitive photodiode is essential for its practical use. A one-chip integrated circuit con sisting of a diode laser, a transmitter, a receiver, a detector, and a data proces sor, which can be directly coupled with an optical fiber system, might be the ultimate approach for practical spec troscopic analysis.
(28) Okazaki, T.; Imasaka, T.; Ishibashi, N. Anal. Chim. Acta 1988,209, 327. (29) Sakurai, K.; Yamada, N. Opt. Lett. 1989,14, 233.
(30) Imasaka, T.; Hiraiwa, T.; Ishibashi, N. Mikrochim. Acta 1989,2, 225. (31) Goldberg, L.; Chun, M. K. Appl. Phys. Lett. 1989,55, 218.
References (1) Imasaka, T.; Nakanishi, K.; Ishibashi, N. Anal. Chem. 1987,59,1554. (2) Cova, S.; Lacaita, Α.; Ghioni, M.; Ripamonti, G.; Louis, T. A. Rev. Sci. Instrum. 1989,60,1104. (3) Kawabata, Y.; Kamikubo, T.; Imasaka, T.; Ishibashi, N. Anal. Chem. 1983, 55, 1419. (4) Ohtsu, M.; Kotani, H.; Tagawa, H. Ja pan. J. Appl. Phys. 1983,22,1553. (5) Chan, K.; Ito, H.; Inaba, H. Appl. Opt. 1983,22,3802. (6) Lenth, W.; Gehrtz, M. Appl. Phys. Lett. 1985,47,1263. (7) Imasaka, T.; Kamikubo, T.; Kawabata, Y.; Ishibashi, N. Anal. Chim. Acta 1983, 153, 261. (8) Nakanishi, K.; Imasaka, T.; Ishibashi, N. Anal. Chem. 1985,57,1219. (9) Unger, E.; Patonay, G. Anal. Chem. 1989,67,1425. (10) Imasaka, T.; Yoshitake, Α.; Ishibashi, N. Anal. Chem. 1984,56,1077. (11) Kawabata, Y.; Imasaka, T.; Ishibashi, N. Talanta 1986,33, 281. (12) Johnson, P. Α.; Barber, T.· E.; Smith, B. W.; Winefordner, J. D. Anal. Chem. 1989,67,861. (13) Imasaka, T.; Yoshitake, Α.; Hirata, K.; Kawabata, Y.; Ishibashi, N. Anal. Chem. 1985,57, 947. (14) Sauda, K; Imasaka, T.; Ishibashi, N. Anal. Chim. Acta 1986,187,353. (15) Sauda, K.; Imasaka, T.; Ishibashi, N. Anal. Chem. 1986,58, 2649. (16) Imasaka, T.; Okazaki, T.; Ishibashi, N. Anal. Chim. Acta 1988,208,325. (17) Imasaka, T.; Nakagawa, H.; Okazaki, T.; Ishibashi, N., unpublished results. (18) Imasaka, T.; Tsukamoto, Α.; Ishibashi, N. Anal. Chem. 1989,61, 2285. (19) Folestad, S.; Ahlberg, H. International Symposium on Column Liquid Chroma tography, Stockholm, June 26-30,1989. (20) Lawrenz, J.; Niemax, K. Spectrochim. Acta 1989,44B, 155. (21) Hergenrôder, R.; Niemax, K. Spectrochim. Acta 1988,43B, 1443. (22) Johnson, P. Α.; Vera, J. Α.; Smith, B. W.; Winefordner, J. D. Spectrosc. Lett. 1988,27,607. (23) Hancock, D. O.; Synovec, R. E. Anal. Chem. 1988,60,1915. (24) Chen, C. Y.; Demana, T.; Huang, S. D.; Morris, M. D. Anal. Chem. 1989,67,1590. (25) Lloyd, D. K.; Goodall, D. M; Scriven er, H. Anal. Chem. 1989,67,1238. (26) Williamson, J. M.; Bowling, R. J.; McCreery, R. L. Appl. Spectrosc. 1989, 43,372. (27) Angel, S. M.; Myrick, M. L. Anal. Chem. 1989,67,1648.
Nobuhiko Ishibashi (left) is professor of applied analytical chemistry at Kyushu University, where he has been a member of the faculty since 1954. He is chairman of the Japanese Association of Flow Injection Analysis and past vice-president of the Japan Society for Analytical Chemistry and the Electrochemical Society of Japan. His research interests include laser fluorometry, supersonic molecular beam fluorometry, optical fiber sensors, ion-selective electrodes, ion-exchange membranes, and flow analysis. Totaro Imasaka (right) received his Ph.D. from Kyushu University, where he has been a member of the Faculty of Engineering since 1980. His research inter ests include investigations of supersonic jet spectrometry and semiconductor laser spectrometry. More recently, he has concentrated on developing a widely tunable laser system based on two-color stimulated Raman emission.
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ANALYTICAL CHEMISTRY, VOL. 62, NO. 6, MARCH 15, 1990 · 371 A
