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KIST MXenes shorten laser pulses

  • Author:Ella Cai
  • Release on :2017-12-06
Researchers at the Korea Institute of Science and Technology (KIST), the University of Seoul and Drexel University in the US, have found a way to produce stable laser pulses only 600 femtoseconds (quadrillionths of a second) long.

The researchers tested a MXene made of titanium carbonitride to fabricate a ‘mode-locking’ device. The apparatus was placed in the laser cavity and found to produce the 600 femtosecond long stable laser pulses.

This means thar MXenes now have one more promising application: helping lasers fire extremely short femtosecond pulses,

The finding opens up avenues for developing advanced femtosecond pulse lasers, which can be used for precision eye surgery and material processing.

MXenes are a class of two-dimensional materials made of transition metals — the metals occupying the central block of the periodic table — combined with carbon and/or nitrogen. Despite their promising performance in a broad range of applications, including energy storage and gas sensing, their potential use for ultrafast optics had not been explored.

This metallic MXene based device was found to be applicable for long wavelength mid-IR lasers, which is a very strong advantage for laser applications.

Femtosecond-long laser pulses have many applications, such as in i-Lasik precision eye surgery, in which tiny areas of tissue need to be destroyed in a time short enough that the energy used for this purpose can’t diffuse to the surrounding tissues and damage them. These laser pulses are also used to fabricate micro-sized sensors and devices.

The research can be used to develop strategies for fabricating saturable absorber materials, which absorb less light as its intensity increases. This optical phenomenon is one of several generated as a result of a concept called nonlinearity. Nonlinear optics has been one of the most rapidly growing scientific fields in past decades.




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