MoS₂ saturable absorber for a Q-switched mode-locked 2 µm laser

Abstract

A few-layer molybdenum disulfide (MoS 2 ) saturable absorber was successfully fabricated by thermally decomposing ammonium thiomolybdate through dip coating the mica and applying 2 µm Q-switched mode-locked (QML) Tm:YAP laser pulse generation. The modulation depth of the QML laser was close to 100%. The duration of the mode-locked pulse within the Q-switched pulse envelope is estimated to be ~100 ps with a 92.1 MHz repetition rate. A maximum average output power of 109 mW was obtained and the highest pulse energy in the Q-switched envelope was 1.18 nJ. The results indicated that MoS 2 -SA is available for ultrafast 2 µm lasers.

A diode‐pumped SnS2 passively Q‐switched Tm‐doped pulsed laser

“…They were capable to perform exceptionally well in visible 17,18 to mid-infrared regions 19,20 due to ultra-fast recovery time, wide operational bandwidth, excellent nonlinear optical response, and saturable absorption capability. [21][22][23][24][25] SnS 2 , classed as TMDs, was expected to possess comparable saturable absorption characteristics to MoS 2 and WS 2 . Featuring a CdI 2type crystal structure, it consisted of a layer of tin cations placed between two layers of sulfur anions.…”

“…MoS 2 and WS 2 were the representatives of TMDs. They were capable to perform exceptionally well in visible 17,18 to mid‐infrared regions 19,20 due to ultra‐fast recovery time, wide operational bandwidth, excellent nonlinear optical response, and saturable absorption capability 21–25 . SnS 2 , classed as TMDs, was expected to possess comparable saturable absorption characteristics to MoS 2 and WS 2 .…”