Real-Time Measurement of Photodissociation with a Static Modulated Fourier Transform Spectrometer

A static modulated Fourier transform spectrometer composed of a modified Sagnac interferometer was implemented for real-time remote sensing the spectral property changes in solid dye. In spectrum obtained from spectrometer, relationship between resolution and dependent factors discussed to prevent aliasing. As target material, solid-state dye rhodamine-6G fabricated laboratory. When an intense pumping laser light irradiated dye, with increasing irradiating time, photodissociation occurred due accumulated heat fluorescence intensity decreased rapidly. The fast change could be measured analyzed real time using source, diode 1 W output power at 530 nm, which pulse width modulation possible, used. sample 10 Hz repetition rate 2.5 ms duration 900 s, by 44%, peak wavelength shifted 590 586 maximum temperature portion rose up 45 °C. Under same conditions, when increased 4 times ms, 65%, 580 76 proposed this study effective measuring analyzing properties rapidly changing materials time.