Abstract

Single-walled carbon nanotube encapsulated in boron nitrite nanotube (SWCNT@BNNT) is a novel nanomaterial with a one-dimensional van der Waals (1D-vdW) heterostructure. In this paper, we demonstrated that the SWCNT@BNNT has an enhanced optical power tolerance compared to that of the pristine SWCNT while preserving the ultrafast optical saturable absorption properties. The thermal damage threshold of SWCNT@BNNT is 2 dB higher than that of the pristine SWCNT, resulting in 9 times longer lifetime for 1 dB degradation and 214 times longer lifetime for 3 dB degradation under optical power intensity of 6.8 kW/cm². The high optical power tolerance of SWCNT@BNNT is further confirmed in a short-cavity mode-locked laser with a high repetition rate of 1 GHz with a high optical power intensity. We have shown the potential of using 1D-vdW heterostructure fabrication technique to modify and enhance the optical properties of the encapsulated nanomaterials [CE: Please check aff. we have deleted addrline mater and table 1 missing in source file we have capture in pdf. Please need to proof reading.].

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