# Evanescent Field Functional Cu3-xP Nanoparticles as Effective Saturable Absorbers with high Repeatability for Femtosecond Soliton Pulse generation

## TL;DR

This paper demonstrates the use of Cu3-xP nanoparticle-based saturable absorbers for generating femtosecond pulses at 1560 nm, highlighting their high repeatability, tunability, and potential for scalable industrial applications.

## Contribution

It introduces a novel application of heavily-doped Cu3-xP nanocrystals as effective, reproducible saturable absorbers for ultrafast laser pulse generation.

## Key findings

- Successful mode-locking and Q-switching at 1560 nm
- High repeatability of the saturable absorbers
- Potential for large-scale industrial production

## Abstract

Recently, a new emerging field about heavily-doped colloidal plasmonic nanocrystals (NCs) has attracted great attention due to their lower and expediently adjustable free carrier densities, lower and tunable LSPR band in the spectral range from NIR to MIR and higher optical nonlinearity. These new kinds of plasmonic materials will show huge potential and opportunities for nonlinear optical applications, such as ultrafast switching, nonlinear sensing and pulse laser generation. In this work, we demonstrate that high-quality mode-locking and Q-switching pulses at 1560 nm can both be generated by using controllable concentration of Cu3-xP NCs solution and fabricating evanescently interacted saturable absorbers. Furthermore, the plasmonic NCs material has good reproduction for fabricating SA devices and promising potential for large-scale industrial production. Our results may attract great attention for further investigations of heavily-doped plasmonic NCs as next generation, cheap and solution-processed element for fascinating applications in optoelectronic devices.

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Source: https://tomesphere.com/paper/1901.08714