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An entangled cavity optical parametric oscillator is applied for photoacoustic spectroscopy in the wavelength range of 3.8-4.3 mum. High resolution spectra of N2O are reported around 3.8 and 4 mum.
Entangled cavity optical parametric oscillators are known as powerful devices to fulfill requirements for high resolution spectroscopy. We demonstrate here that output performances can be strongly improved by using a partial pump beam reflection.
We present what we believe to be the first demonstration of high resolution molecular spectroscopy in the mid-infrared by a free running pulsed optical parametric oscillator. Absorption spectroscopy of N2 O is demonstrated as an application
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