[20a-B301-1~11] 3.6 Ultrashort-pulse and high-intensity lasers

▲ [20a-B301-8] Yb-doped Fiber Laser Based Mid-Infrared Frequency Comb at 4.5 mm for CRDS Application

〇LEI JIN¹, Volker Sonnenschein¹, Ryohei Terabayashi¹, Noriyoshi Hayashi¹, Shusuke Kato¹, Masahito Yamanaka¹, Hideki Tomita¹, Tetsuo Iguchi¹, Atsushi Sato², Kohei Nozawa², Yoshida Kenji², Norihiko Nishizawa¹ (1.Nagoya Univ., 2.Sekisui Medical)

Keywords:fiber laser, optical frequency comb, mid-infrared

In this report, we demonstrated an Yb-doped fiber laser based MIR comb with a wavelength tunability of 3.9-4.7 um, and a maximum power of 4.2 mW measured at 4.5 um was observed. The output power had good stability with the fluctuation less than 2 %. Beat note measurement was performed with help of a quantum cascade laser (QCL). A stable and sharp beat note signal was observed in MIR region with a linewidth of 380 kHz, of which the SNR was larger than 20 dB. The generated MIR comb was overlapped with a QCL, and they were applied for a cavity ring-down spectroscopy (CRDS) cell. The absorption properties of the air was successfully measured with this system.