Intense optical parametric amplification in dispersion engineered nanophotonic lithium niobate waveguides

Ledezma, Luis; Sekine, Ryoto; Guo, Qiushi; Nehra, Rajveer; Jahani, Saman; Marandi, Alireza

doi:10.48550/arxiv.2104.08262

Cited by 10 publications

(16 citation statements)

References 31 publications

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“…In contrast, in a stationary OPA process (with negligible temporal walk-off between the pump and signal), the signal gets amplified without considerable pulse compression as shown in Fig. 1(a) [40]. Figure 1(b) shows the mechanisms contributing to the nonlinear dynamics of the OPO which are responsible for this quadratic soliton formation.…”

Section: Resultsmentioning

confidence: 97%

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Temporal Walk-off Induced Dissipative Quadratic Solitons

Roy,

Nehra,

Jahani

et al. 2021

Preprint

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A plethora of applications have recently motivated extensive efforts on the generation of low noise Kerr solitons and coherent frequency combs in various platforms ranging from fiber to whispering gallery and integrated microscale resonators. However, the Kerr (cubic) nonlinearity is inherently weak, and in contrast, strong quadratic nonlinearity in optical resonators is expected to provide an alternative means for soliton formation with promising potential. Here, we demonstrate formation of a dissipative quadratic soliton via non-stationary optical parametric amplification in the presence of significant temporal walk-off between pump and signal leading to half-harmonic generation accompanied by a substantial pulse compression (exceeding a factor of 40) at low pump pulse energies (∼ 4 picojoules). The bright quadratic soliton forms in a low-finesse cavity in both normal and anomalous dispersion regimes, which is in stark contrast with bright Kerr solitons. We present a route to significantly improve the performance of the demonstrated quadratic soliton when extended to an integrated nonlinear platform to realize highly-efficient extreme pulse compression leading to formation of few-cycle soliton pulses starting from ultra-low energy picosecond scale pump pulses that are widely tunable from ultra-violet to mid-infrared spectral regimes.Formation of dissipative solitons in nonlinear resonators has become a versatile mechanism for stable femtosecond sources [1,2]. In the frequency domain it corresponds to a broadband frequency comb which, when self-referenced, leads to a myriad of applications in precision measurements spanning from spectroscopy [3,4], astro-combs [5,6], atomic clocks [7], ranging [8,9], and imaging [10], to name a few. Recently, the ambit of frequency combs has expanded to cover promising avenues including massively parallel data communication [11], and realization of machine learning accelerators [12]. To cater to this increasing list of technologically important applications, there lies the outstanding challenges of attaining low-power operation [13], high pump to soliton conversion efficiency [14-18], broadband (octave-spanning and widely tunable) comb formation in a compact platform [19,20], reliable fabrication and operation of high-Q resonators which need to be addressed.

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Section: Resultsmentioning

confidence: 97%

“…The quadratic soliton can exist irrespective of the sign of the cavity second order GVD coefficient. Extensive dispersion engineering capability can be accessed through integrated nanophotonics platform which can be designed to maximize the FOM [40,43,44]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Temporal Walk-off Induced Dissipative Quadratic Solitons

Roy,

Nehra,

Jahani

et al. 2021

Preprint

Self Cite

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“…To implement the χ (2) -based ReLU function, we use a periodically poled thinfilm lithium niobate (PPLN) nanophotonic waveguide that exploits the strong and instantaneous χ (2) optical nonlinearity of lithium niobate and tight spatial confinement of the waveguide modes to enhance the nonlinearity [24]. Additionally, careful qausi-phase matching and dispersion engineering enables ultrabroadband and low-energy interactions over mm-long propagation lengths, further enhancing the nonlinear optical processes using femtosecond laser pulses [25,26,27]. Images of the device are shown in Fig.…”

Section: Device Designmentioning

confidence: 99%

“…The ideal parameters found from simulation were a ridge top width of w = 1700 nm and etch-depth of h = 350 nm. See [27] for further details about fabrication and dispersion engineering of PPLN nanophotonic waveguides.…”

Section: Device Designmentioning

confidence: 99%

All-optical ultrafast ReLU function for energy-efficient nanophotonic deep learning

Li¹,

Sekine²,

Nehra³

et al. 2022

Preprint

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In recent years, the computational demands of deep learning applications have necessitated the introduction of energy-efficient hardware accelerators. Optical neural networks are a promising option; however, thus far they have been largely limited by the lack of energy-efficient nonlinear optical functions. Here, we experimentally demonstrate an all-optical Rectified Linear Unit (ReLU), which is the most widely used nonlinear activation function for deep learning, using a periodically-poled thin-film lithium niobate nanophotonic waveguide and achieve ultra-low energies in the regime of femtojoules per activation with near-instantaneous operation. Our results provide a clear and practical path towards truly all-optical, energy-efficient nanophotonic deep learning.

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“…Recently, lithium niobate (LN) nanophotonics has opened promising avenues in optical communication, sensing, and computation due to its extraordinary optical, electrical, and acoustic properties [38,39]. A combination of sub-wavelength confinement of the optical mode, strong χ (2) nonlinearity, high-fidelity quasi-phasematching (QPM) by periodic poling, and dispersion engineering for longer interaction lengths has enabled devices outperforming the traditional LN devices [40][41][42][43].…”

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confidence: 99%

Few-cycle vacuum squeezing in nanophotonics

Nehra,

Sekine,

Ledezma

et al. 2022

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One of the most fundamental quantum states of light is squeezed vacuum, in which noise in one of the quadratures is less than the standard quantum noise limit. Significant progress has been made in the generation of optical squeezed vacuum and its utilization for numerous applications. However, it remains challenging to generate, manipulate, and measure such quantum states in nanophotonics with performances required for a wide range of scalable quantum information systems. Here, we overcome this challenge in lithium niobate nanophotonics by utilizing ultrashort-pulse phase-sensitive amplifiers for both generation and all-optical measurement of squeezed states on the same chip. We generate a squeezed state spanning over more than 25 THz of bandwidth supporting only a few optical cycles, and measure a maximum of 4.9 dB of squeezing (∼11 dB inferred). This level of squeezing surpasses the requirements for a wide range of quantum information systems. Our results on generation and measurement of few-optical-cycle squeezed states in nanophotonics enable a practical path towards scalable quantum information systems with THz clock rates and open opportunities for studying non-classical nature of light in the sub-cycle regime.

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Intense optical parametric amplification in dispersion engineered nanophotonic lithium niobate waveguides

Cited by 10 publications

References 31 publications

Temporal Walk-off Induced Dissipative Quadratic Solitons

Temporal Walk-off Induced Dissipative Quadratic Solitons

All-optical ultrafast ReLU function for energy-efficient nanophotonic deep learning

Few-cycle vacuum squeezing in nanophotonics

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