Cumulative defocusing of sub-MHz-rate femtosecond-laser pulses in bulk diamond envisioned by transient A-band photoluminescence
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-06-12 |
| Journal | Optical Materials Express |
| Authors | S. I. Kudryashov, Nikita Stsepuro, Š. Š. ŠŠ°Š½ŠøŠ»Š¾Š², Nikita Smirnov, A. V. Levchenko |
| Institutions | P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Bauman Moscow State Technical University |
| Citations | 15 |
Abstract
Section titled āAbstractāHigh-rate direct femtosecond (fs) laser writing is a well-established technology for fabricating various micro-optical elements in bulk dielectrics. In this technology, the āheat accumulationā effect, occurring during high-repetition rate (ā¼ 1 MHz) exposure in dielectrics by a fs laser, enables ultralow-energy micro-modification via cumulative heating. Meanwhile, in this work in the transient multi-photon A-band photoluminescence studies, we demonstrate that this effect underlies dynamic thermal lensing even in diamond with its high thermal conductivity, dynamically shifting the laser focus upstream. Our study paves the way for more precise, accurate and robust direct fs-laser writing of advanced three-dimensional structures in diamond and other dielectrics for a variety of photonic applications.