Self-injection locking of a laser diode to a high-Q WGM microresonator

Kondratiev, Nikita M.; Lobanov, Valery E.; Cherenkov, A. V.; Voloshin, Andrey S.; Pavlov, N. G.; Koptyaev, S.; Gorodetsky, M. L.

doi:10.1364/oe.25.028167

Cited by 231 publications

(150 citation statements)

References 40 publications

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“…More recently DKS generation and combs have been demonstrated using a variety of compact semiconductor-based sources. In particular, coupling of a high-quality-factor (high-Q) microresonator to a diode laser has been demonstrated to provide laser stabilization and linewidth reduction via the selfinjection locking effect [9][10][11][12][13][14]. Usually, narrow-linewidth laser sources have been used for microresonator pumping and frequency comb generation.…”

Section: Introductionmentioning

confidence: 99%

Modulational instability and frequency combs in whispering-gallery-mode microresonators with backscattering

Kondratiev

Lobanov

2020

Phys. Rev. A

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We introduce the first principle model describing frequency comb generation in a WGM microresonator with the backscattering-induced coupling between the counter-propagating waves. Elaborated model provides deep insight and accurate description of the complex dynamics of nonlinear processes in such systems. We analyse the backscattering impact on the splitting and reshaping of the nonlinear resonances, demonstrate backscattering-induced modulational instability in the normal dispersion regime and subsequent frequency comb generation. We present and discuss novel features of the soliton comb dynamics induced by the backward wave.

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Section: Introductionmentioning

confidence: 99%

Modulational instability and frequency combs in whispering-gallery-mode microresonators with backscattering

Kondratiev

Lobanov

2020

Phys. Rev. A

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“…A simpler and more efficient method proposed in [3] and implemented in [4] is to selfinjection lock a pump laser onto a high-Q microcavity. The drag effect occurs due to Rayleigh scattering inside the microcavity and the feedback of the wave, which returns to the laser, gets a resonant coupling.…”

mentioning

confidence: 99%

“…The drag effect occurs due to Rayleigh scattering inside the microcavity and the feedback of the wave, which returns to the laser, gets a resonant coupling. It was shown in [3] that the frequency of a self-injection locked laser will follow the frequency of the resonator caused by thermal effects. However, in terms of this model it can be shown that the detunings provided by the self-injection locking is too small to provide soliton generation that contradicts to experimental observations reported in [4].…”

mentioning

confidence: 99%

“…Combining the dynamics equations for WGM from [3] with nonlinear terms from [2] with arbitrary pump in stationary case we get Here we introduced the coefficient , which is obtained from the mode overlap integrals and is close to 1 for modes with the same polarization and close to 1/3 for different polarizations. It can be shown that after the inclusion of thermal equation and renormalizing the amplitude, we can get the same form of the equation with , where is a combination of thermal relaxation times of the system.…”

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confidence: 99%

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Influence of the microresonator nonlinearity on the self-injection locking effect

2019

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The effect of self-injection locking of a laser to a nonlinear microresonator is considered. It is shown that an additional detuning arises in the system, depending on the pump power. This effect can contribute to the generation of optical combs in the pull mode, which will increase the stability of the generated signal.Frequency combs are of great importance for many modern applications in science and technology. Even more interest was attracted to this field, when they were shown to exist in whispering gallery mode (WGM) microresonators [1]. One of the most important objects associated with microresonator-based frequency combs is dissipative Kerr soliton (DKS) [2] representing coherent optical frequency combs with smooth spectral profile. The DKS may only exist if the pump is red detuned from a WGM resonance to compensate Kerr frequency shift. Usually, this can be achieved by tuning the pump laser frequency from the blue to the red slope of the resonance curve.Previous works [2] show that soliton generation happens in a certain range of normalized detunings with lower boundary being the bistability criterion and upper boundary being the soliton stability criterion where is normalized pump, is the detuning of the generation frequency from the microresonator eigenfrequency, normalized to the mode half-linewidth (half loaded decay rate). The obstacle lies in the temperature drop, the resonator experiences when the pump laser transits from the blue detuned (high intracavity power) to the red detuned (lower intracavity power) state. This sudden temperature drop leads to a blue-shift of the resonance frequency and a loss of the soliton state. On the other hand, when the tuning into the soliton state is too quick, the resonator is still cold, and its subsequent heating will again lead to a loss of the soliton state. This problem was initially solved by tuning into the soliton state with an ideal, intermediate speed of frequency scan, such that the resonator reaches the soliton state in a thermal equilibrium, that is, neither too hot nor too cold.A simpler and more efficient method proposed in [3] and implemented in [4] is to selfinjection lock a pump laser onto a high-Q microcavity. The drag effect occurs due to Rayleigh scattering inside the microcavity and the feedback of the wave, which returns to the laser, gets a resonant coupling. It was shown in [3] that the frequency of a self-injection

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“…One of the promising ways to stabilize a laser diode is to use the self-injection locking regime of a laser diode to a high-Q whispering gallery mode (WGM) microcavity [1]. A feature of this approach is that the microcavity provides frequency-selective feedback, which allows one to combine the high radiation power of the laser diode with a narrow linewidth.…”

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confidence: 99%

Self-injection locking of a laser diode to a high-Q silicon WGM microresonator

et al. 2019

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The key properties of the self-injection locking regime of a laser diode to a high-Q microresonator with whispering gallery mode made of crystalline silicon are considered. It has been experimentally demonstrated the possibility of the self-injection locking using cavity made of crystalline silicon. This result opens up new possibilities for creating narrow-band highly stable laser sources in midIR, over 2.3 microns, on a new hardware base.

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Self-injection locking of a laser diode to a high-Q WGM microresonator

Cited by 231 publications

References 40 publications

Modulational instability and frequency combs in whispering-gallery-mode microresonators with backscattering

Modulational instability and frequency combs in whispering-gallery-mode microresonators with backscattering

Influence of the microresonator nonlinearity on the self-injection locking effect

Self-injection locking of a laser diode to a high-Q silicon WGM microresonator

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