Abstract: A column 2 is provided in a gas capturing unit 20 for capturing sample gas. A gas supply unit 1 supplies carrier gas for sending sample gas into the column 2. A gas separation mechanism 100 guides carrier gas in the column 2 to the outside of the column 2 by setting the lead-out path 5 to negative pressure with respect to the inside of the column 2. A heating unit 23 heats the column 2 to desorb sample gas captured by the gas capturing unit 20. Sample gas desorbed from the gas capturing unit 20 is introduced into a cell 31. A light source unit 32 irradiates sample gas in the cell 31 with light. An analysis unit 3 analyzes sample gas based on an intensity change of light emitted by the light source unit 32.

Abstract: A light generator including a light source, an optical switch that controls ON/OFF of light from the light source, and a mirror that reflects light from the optical switch and sends the light back to the optical switch. A light generator less in residue in fitting of a ring-down signal, and a radioactive carbon dioxide isotope analysis device and a radioactive carbon dioxide isotope analysis method, by use of the light generator are provided.

Abstract: A carbon isotope analysis method, including the steps of: generating carbon dioxide isotope from carbon isotope; feeding the carbon dioxide isotope into an optical resonator having a pair of mirrors; applying irradiation light having an absorption wavelength of the carbon dioxide isotope into the optical resonator; adjusting a relative positional relationship between the mirrors so that an optical axis of the irradiation light and an optical axis of light generated by the etalon effect are not matched; measuring the intensity of the transmitted light generated by resonance of carbon dioxide isotope excited by the irradiation light; and calculating the concentration of the carbon isotope from the intensity of the transmitted light. An optical resonator that can be suppressed in the parasitic etalon effect, and a carbon isotope analysis device and a carbon isotope analysis method, by use of the optical resonator, are provided.

Abstract: Provided is a carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including optical resonators having a pair of mirrors, and a photodetector that determines intensity of light transmitted from the optical resonators; and a light generator including a single light source, a first optical fiber that transmits first light from the light source, a second optical fiber that generates second light of a longer wavelength than the first light, the second optical fiber splitting from the first optical fiber and coupling therewith downstream, a first amplifier on the first optical fiber, a second amplifier on the second optical fiber, different in band from the first amplifier, and a nonlinear optical crystal.

Abstract: Provided is a carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including optical resonators having a pair of mirrors, and a photodetector that determines intensity of light transmitted from the optical resonators; and a light generator including a single light source, a first optical fiber that transmits first light from the light source, a second optical fiber that generates second light of a longer wavelength than the first light, the second optical fiber splitting from the first optical fiber and coupling therewith downstream, a first amplifier on the first optical fiber, a second amplifier on the second optical fiber, different in band from the first amplifier, and a nonlinear optical crystal.

Abstract: A carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including an optical resonator having a pair of mirrors and a photodetector that determines intensity of light transmitted from the optical resonator; and a light generator including a light source, a splitter that splits light from the light source, a focusing lens that focuses light from the splitter, and a mirror that reflects light from the focusing lens and sends the light back to the light source via the focusing lens and the splitter. A carbon isotope analysis device improved in stability of a light source and a carbon isotope analysis method by use of the analysis device are provided.

Abstract: A carbon isotope analyzer 1 includes a carbon dioxide isotope generator 40 that includes a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer 10 including an optical resonator 11 having a pair of mirrors 12, and a photodetector 15 that determines the intensity of light transmitted from the optical resonator 11; and a light generator 20 including a light source 23, a first optical fiber 21 to transmit a light beam from the light source 23, a second optical fiber 22 for wavelength conversion, the second optical fiber 22 splitting from the first optical fiber 21 at a point and combining with the first optical fiber 21 at another point downstream of the splitting point, and a non-linear optical crystal 25 that generates light having the absorption wavelength of the carbon dioxide isotope on the basis of the difference in frequency between light beams transmitted through the optical crystal 25.

Abstract: A carbon isotope analyzer 1 includes a carbon dioxide isotope generator 40 that includes a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer 10 including an optical resonator 11 having a pair of mirrors 12, and a photodetector 15 that determines the intensity of light transmitted from the optical resonator 11; and a light generator 20 including a light source 23, a first optical fiber 21 to transmit a light beam from the light source 23, a second optical fiber 22 for wavelength conversion, the second optical fiber 22 splitting from the first optical fiber 21 at a point and combining with the first optical fiber 21 at another point downstream of the splitting point, and a non-linear optical crystal 25 that generates light having the absorption wavelength of the carbon dioxide isotope on the basis of the difference in frequency between light beams transmitted through the optical crystal 25.