Ultrashort-laser electron-hole plasma and intragap states in diamond
Abstract
The article discusses the implementation of ultrafast broadband excitation of A-band luminescence of natural diamond by femtosecond-laser pulses with low-energy near-IR photons. Such regime provides A-band luminescence yield with the fourth-power nonlinearity at low laser intensities and second-power nonlinearity at higher laser intensities. These nonlinear dependences of A-band intensity on laser intensity can be related to quasi-resonant four-photon excitation at lower laser intensities and impact excitation of corresponding optical centers at higher intensities, or to similar nonlinear processes in electron-hole plasma relaxing to trapping donor-acceptor centers.
- Publication:
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European Physical Journal D
- Pub Date:
- August 2021
- DOI:
- 10.1140/epjd/s10053-021-00234-0
- Bibcode:
- 2021EPJD...75..221K