Detuning effects in Brillouin ring microresonator laser

Abstract

Brillouin lasers, with their unique properties, offer an intriguing solution for many applications, yet bringing their performance to integrated platforms has remained questionable. We present a theoretical framework to describe Brillouin lasing in integrated ring microcavities. Specifically, a general case of a mismatch between the Brillouin shift and the microresonator inter-mode spacing is considered. We show that although the lasing threshold is increased with the frequency detuning, a significant enhancement of the laser power in comparison with the pure resonant interaction could be achieved. Moreover, there is an optimal pump frequency detuning from the resonant mode frequency, when the effect is most pronounced. An increase of the Brillouin threshold with the pump frequency detuning is accompanied by narrowing the pump frequency range available for lasing. Importantly, at the optimal value of the pump frequency detuning when the Brillouin signal is maximal, Brillouin signal noise level is minimal. Analytical results obtained in the steady-state approach are in quantitative agreement with the results of numerical simulations.

Brillouin-Kerr Soliton Frequency Combs in an Optical Microresonator

“…The observation of the soliton steps with a blue-detuned input pump (although the Brillouin laser is red detuned) implies that the generated Kerr solitons can be thermally self-stable [35] even with the red-detuned Brillouin laser excitation (see Supplementary Material [38], Sections IV and V). Moreover, the interaction between the input pump and the generated Brillouin laser will also alter the cavity lineshape of the pump mode [39,40], which extends the thermal self-stability of the pump into the red-detuning region (see Supplementary Material [38], Section IV).…”

Brillouin interaction between single optical modes excited in multimode fibers

“…Looking to future experiments that have to be performed to verify the theoretical predictions reported in this work, the amplified narrow-band fiber lasers [49][50][51][52][53][54][55] combined with the all-digital hologram and phase plate devices 56,57 could be considered as valuable candidates to serve as critical elements of the experimental setup, enabling the selective excitation of pure single optical modes in multimode fibers, and their de-multiplexing at the fiber output. Direct control of the optical field amplitudes and phases through a flexible SLM used as a holographic filter enables a fast switch of the excited fiber mode composition.…”

Brillouin Interaction between Two Optical Modes Selectively Excited in Weakly Guiding Multimode Optical Fibers

“…Looking to future experiments that have to be performed to verify the theoretical predictions reported in this work, the amplified narrow-band fiber lasers [ 45 , 46 , 47 , 48 , 49 , 50 ] combined with the all-digital hologram and phase plate devices [ 51 , 52 ] could be considered as valuable candidates to serve as critical elements of the experimental setup, enabling the selective excitation of pure single optical modes in multimode fibers, and their de-multiplexing at the fiber output. Direct control of the optical field amplitudes and phases through a flexible SLM used as a holographic filter enables a fast switch of the excited fiber mode composition.…”