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High Resolution Raman Detection of 12CO2 and 13CO2 Isotopes in Human Breath

We present an effective system for detecting carbon isotopes <sup>12</sup>CO<inf>2</inf> and <sup>13</sup>CO<inf>2</inf> in human breath with an extremely low concentration level of ~0.01%. The Raman detector consists of a 5W-CW-solid-state laser at 532 nm, a focusing system, a gas cell and a high-resolution Czerny-Turner based spectrometer. Such a system is in demand in the medical diagnosis of various diseases.