3 research outputs found
Optical black hole lasers
Using numerical simulations we show how to realise an optical black hole
laser, i.e. an amplifier formed by travelling refractive index perturbations
arranged so as to trap light between a white and a black hole horizon. The
simulations highlight the main features of these lasers: the growth inside the
cavity of positive and negative frequency modes accompanied by a weaker
emission of modes that occurs in periodic bursts corresponding to the cavity
round trips of the trapped modes. We then highlight a new regime in which the
trapped mode spectra broaden until the zero-frequency points on the dispersion
curve are reached. Amplification at the horizon is highest for
zero-frequencies, therefore leading to a strong modification of the structure
of the trapped light. For sufficiently long propagation times, lasing ensues
only at the zero-frequency modes.Comment: accepted for publication in Classical and Quantum Gravit
Optical black hole lasers
Using numerical simulations we show how to realize an optical black hole laser, i.e. an amplifier formed by travelling refractive index perturbations arranged so as to trap light between a white and a black hole horizons. The simulations highlight the main features of these lasers: the growth inside the cavity of positive and negative frequency modes accompanied by a weaker emission of modes that occurs in periodic bursts corresponding to the cavity round trips of the trapped modes. We then highlight a new regime in which the trapped mode spectra broaden until the zero-frequency points on the dispersion curve are reached. Amplification at the horizon is highest for zero-frequencies, therefore leading to a strong modification of the structure of the trapped light. For sufficiently long propagation times, lasing ensues only at the zero-frequency modes.</p