Regular Article – Optical Phenomena and Photonics
Ultrashort-laser electron–hole plasma and intragap states in diamond
Lebedev Physical Institute, 119991, Moscow, Russia
2 Bauman Moscow State Technical University, 105005, Moscow, Russia
Accepted: 22 July 2021
Published online: 9 August 2021
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.
© The Author(s) 2021. corrected publication 2021
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