Junji Mata

147 fs, 51 MHz soliton fiber laser at 1.56 µm with a fiber-connector-type SWNT/P3HT saturable absorber

We fabricated a fiber-connector-type saturable absorber in which SWNTs and P3HT (poly-3-hexylthiophene) were coated on the connector end. The pulse width was 147 fs and the repetition rate reached as high as 51 MHz.

A 113 fs fiber laser operating at 1.56 μm using a cascadable film-type saturable absorber with P3HT-incorporated single-wall carbon nanotubes coated on polyamide

We successfully fabricated a cascadable film-type single-wall carbon nanotube (SWNT) saturable absorber coated on aromatic polyamide film, in which the saturable absorption effect can be controlled with the number of films. A conductive polymer P3HT (poly-3-hexylthiophene) was adopted to obtain a uniform SWNT solution. We applied saturable absorber films to a passively mode-locked fiber laser and successfully generated a 113 fs, 42 MHz pulse by inserting two film layers between fiber connectors in the cavity.

Influence of Small Amounts of Dispersed Single-Walled Carbon-Nanotubes on the Optical Properties of Poly-3-hexylthiophene

We studied the dispersion of single-walled carbon-nanotubes (SWNTs) in poly-3-hexylthiophene (P3HT) and the influence of their dispersion on the optical properties of the polymer. The bundles of SWNTs were found to be well dispersed in P3HT solution, being broken up into finer ropes. We also found that dispersal of only a small amount (less than 1 wt%) of SWNTs in P3HT gives rise to a steep increase in optical absorbance close to the absorption edge, remarkable quenching of photoluminescence, and formation of oriented micro-domains. These results suggest that an ordered structure in the conjugation of P3HT is formed by the incorporation of SWNTs.

131 fs, 33 MHz all-fiber soliton laser at 1.07 μm with a film-type SWNT saturable absorber coated on polyimide

We present a 1.07 microm all-fiber femtosecond soliton laser employing a film-type saturable absorber with a P3HT (poly-3-hexylthiophene) incorporated SWNT coated on polyimide film. We optimized the laser cavity as a dispersion-managed soliton laser with photonic crystal fiber (PCF) as an anomalous dispersion fiber at 1.07 microm. As a result, a 131 fs, 33 MHz pulse was successfully generated with a simple laser configuration.

A 31 mW, 280 fs passively mode-locked fiber soliton laser using a high heat-resistant SWNT/P3HT saturable absorber coated with siloxane

We report a substantial increase in the heat resistance in a connector-type single-wall carbon nanotube (SWNT) saturable absorber by sealing SWNT/P3HT composite with siloxane. By applying the saturable absorber to a passively mode-locked Er fiber laser, we successfully demonstrated 280 fs, 31 mW pulse generation with a fivefold improvement in heat resistance.