Ultra-broadband detection of coherent infrared pulses by sum-frequency generation spectroscopy in reflection geometry

Risako Kameyama, Shunsuke Tanaka, Yuta Murotani, Takuya Matsuda, Natsuki Kanda, Ryusuke Matsunaga, Jun Yoshinobu

doi:10.1364/ol.530328

<jats:p>We have newly developed, to the best of our knowledge, a detection method for broadband infrared pulses based on sum-frequency generation spectroscopy in reflection geometry, which can avoid a restriction of the detection bandwidth originating from the phase mismatch that is inevitable for the upconversion in transmission geometry. Using a GaAs crystal, we successfully demonstrated the ultra-broadband detection of the infrared pulses generated from a two-color laser-induced air plasma filament in a region from 300 to 3300 cm<jats:sup>−1</jats:sup>. With the advantage of ultra-short infrared pulses, the present detection method holds promise for application to time-resolved, ultra-broadband vibrational spectroscopy.</jats:p>

Ultra-broadband detection of coherent infrared pulses by sum-frequency generation spectroscopy in reflection geometry

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