Mode-locked oscillation of Cr:ZnS laser using a single walled carbon nanotube film with resonant absorption at 2.4 μm

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Research units

  • University of Tokyo
  • National Institute of Advanced Industrial Science and Technology


Ultrashort pulses in the mid-infrared (mid-IR) region have a great potential in the applications of advanced vibrational spectroscopy and strong field phenomena. Traditionally, mid-IR ultrashort pulses are generated by frequency conversion of near-infrared pulses from Ti:S or Yb-based lasers. Laser oscillators which directly emit mid-IR femtosecond pulses are advantageous from the perspectives of simplicity and energy extraction efficiency. Cr:ZnS is an attractive gain medium for mid-IR ultrafast lasers because it has a broad fluorescence spectrum, large stimulated-emission cross-section and high thermal conductivity [1]. So far, passive mode-locking has been realized for Cr:ZnS laser, by employing Kerr-lensing, or by using saturable absorbers based on semiconductors or graphenes [2]. A single walled carbon nanotube (SWCNT) film is also known as a good candidate for saturable absorbers, possessing tunable resonance and large modulation depth. However, SWCNTs have rarely been applied to this laser [3]. Here, we demonstrate self-starting mode-locked oscillation of Cr:ZnS laser by using a SWCNT film which has resonant absorption at the laser emission wavelength of 2.4 μm.


Original languageEnglish
Title of host publication2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Publication statusPublished - 1 Jun 2019
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference - Munich, Germany
Duration: 23 Jun 201927 Jun 2019


ConferenceEuropean Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference
Abbreviated titleCLEO/Europe-EQEC

ID: 38650730