[10p-Z19-1~15] 3.6 Ultrashort-pulse and high-intensity lasers

[10p-Z19-14] Generation and amplification of 4.7 cycle mid-infrared optical pulses from Cr:ZnS laser

〇(D)Daiki Okazaki¹, Esko Kauppinen², Shohei Chiashi³, Shigeo Maruyama³, Satoshi Ashihara¹ (1.IIS, UTokyo, 2.Aalto Univ., 3.Faculty of Eng., UTokyo)

Keywords:laser, mid-infrared, Ultrashort pulse

Recently, ultrafast pulsed lasers in the mid-infrared region have been attracting attention. We are developing a Cr:ZnS laser to realize a high repetition and compact mid-infrared ultrashort pulsed light sources. In this study, a repetition frequency of 40 MHz, a center wavelength of 2.3 um, and spectrum width of 177 nm with a pulse duration of 36 fs (4.7 cycles) is realized by selecting the proper diameter of single-walled carbon nanotubes, adjusting the film thickness, Cr:ZnS crystal length, and output coupling efficiency. By introducing a two-stage single-pass amplifier, it is amplified up to 74 nJ.