Mid-infrared absorption spectroscopy across a 14.4 THz spectral range using a broadband femtosecond optical parametric oscillator

Tillman, K.A.; Maier, R.R.J.; Reid, D.T.; McNaghten, E.D.
October 2004
Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3366
Academic Journal
We describe the implementation of optical absorption spectroscopy in which a Ti:sapphire pumped femtosecond optical parametric oscillator based on periodically poled lithium niobate was used as a broadband source to directly acquire a midinfrared absorption spectrum of methane gas. Fourier-transform spectroscopy was performed using the idler output from the optical parametric oscillator to directly acquire spectra spanning over 600 nm (14.4 THz or 480 cm-1) with around 3 nm (78 GHz or 2.6 cm-1) resolution. This approach combines the advantages of spectroscopy using broadband thermal sources with the high power and excellent beam quality of a mode-locked laser source.


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