Low-dimensional nanomaterial saturable absorbers for ultrashort-pulsed waveguide lasers

Xiantao Jiang*, Simon Gross, Michael J. Withford, Han Zhang, Dong Il Yeom, Fabian Rotermund, Alexander Fuerbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


A wide range of saturable absorbers composed of novel low-dimensional nanomaterials were fabricated, and their linear and nonlinear optical properties were characterized. Furthermore, their suitability for ultrashort-pulse generation in waveguide laser operating at a wavelength of 2 microns was demonstrated and passively q-switched modelocked operation was achieved with all absorbers. The material systems that were studied in this work include nanosheet-based absorbers composed of graphene, carbon nanotubes, black phosphorus, transition-metal dichalcogenides, topological insulators and indium tin oxide. By utilizing a uniform few-layer spin coating fabrication technique and by employing a single, identical laser resonator, a direct comparison of the individual characteristics of these materials in the context of short-pulse generation in waveguide lasers was made possible. Each of the individually fabricated and characterized saturable absorbers was placed inside a thulium-doped fluoride glass waveguide chip laser cavity and the resulting output performance was analyzed and contrasted. It was further found that the few-layer spin coating approach enables fine-tuning of the absorber characteristics and that all low-dimensional nanomaterials under investigation can be utilized for ultrashort pulse generation in the 2-micron wavelength range. General guidelines for the design of passively modulated shortpulsed laser oscillators are presented based on those findings.

Original languageEnglish
Pages (from-to)3055-3071
Number of pages17
JournalOptical Materials Express
Issue number10
Publication statusPublished - 1 Oct 2018


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