Adiabatic processes in frequency conversion

Suchowski, Haim; Porat, Gil; Arie, Ady

doi:10.1002/lpor.201300107

Cited by 143 publications

(107 citation statements)

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“…The spectral dependence has ripples resulting from oscillations of the erfi-functions in Eq. (14). In order to smooth the spectral ripples, an apodization technique [26] may be additionally employed to design the structure, which however is beyond our consideration.…”

Section: Resultsmentioning

confidence: 99%

“…Chirped structures are also considered to be promising for adiabatic frequency conversion with efficiency as high as possible. The basic concept of and recent advances in adiabatic frequency conversion are reviewed in [14]. However, in our opinion an exact analytical expression to characterize SHG in chirped lattices has not been found yet.…”

Section: Introductionmentioning

confidence: 99%

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Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction

2015

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We analyze second harmonic generation (SHG) in a two dimensional nonlinear optical superlattice (NLOS) with its modulation period being chirped in the propagation direction and constant in the transverse direction. This results in efficient multiple SHG via nonlinear Raman-Nath diffraction. We obtain exact analytical expressions for a SH amplitude generated in chirped 2D NLOSs and for its quasi-phasematching bandwidth. The results of analytical calculations are in excellent agreement with the numerical ones. We show that the process is robust to angular deviations of NLOS and it can be applied to enable tunable and broadband frequency conversion.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction

2015

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“…For the available pump intensity in the experiment (maximum 50 MW/cm 2 ), at least 80 % conversion efficiency from IR to visible is expected across the entire bandwidth. For higher intensities, the efficiency asymptotically approaches 100 %, as supported by a number of earlier experiments using adiabatic frequency conversion [10,17].…”

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confidence: 82%

“…It is based on an analogy between the dynamics of a two-level atomic system induced by coherent light, and the processes of SFG/DFG in the undepleted pump approximation [7,8]. The use of adiabatic phase-matching techniques to perform efficient population transfer in multilevel systems has been well established over the years [9][10][11][12][13][14][15][16][17]. It was shown in a series of experimental demonstrations that adiabatic schemes are very attractive in nonlinear optics because they are robust to small changes in parameters that affect the phase evolution of the process [10,11,14,15].…”

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confidence: 99%

Broadband photon pair generation at 3ω/2

et al. 2016

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where the amount generated in each color is dependent on the phase mismatch value of the process and the length of the nonlinear interaction between the waves [4]. By definition, SPDC is a nonlinear process in which the frequencies of the photon pairs are lower than that of the pump wave. For this reason, conventional generation of photon pairs in the visible optical regime typically requires ultraviolet pump frequencies. The use of ultraviolet light in such schemes is very challenging because of the large phase mismatch between the waves, resulting in very poor conversion efficiency. Furthermore, several highly efficient nonlinear crystals-LiNbO 3 and KTiOPO 4 -are opaque in the ultraviolet range and therefore cannot be used.One way to overcome such difficulties is to perform SPDC followed by an upconversion process that allows for frequency conversion of light from near-infrared to visible. In addition, nonlinear frequency conversion of photon pairs provides a wavelength flexibility that is important for many applications, including the realization of practical quantum communication networks [5]. Yet, as the generation of SPDC spectra typically spans a large bandwidth, the conventional approach of optical upconversion in a nonlinear device fails due to the narrowband nature of the frequencyconversion process in a perfect phase-matched interaction [1, 6]. Thus, for broadband photon pair generation, the total nonlinear efficiency of such sequential processes is commonly quite poor. However, it is possible to tradeoff efficiency for high phase-matching bandwidth by using carefully designed QPM crystals. But owing to the high dispersion of most quasi-phase-matched crystals, which increases significantly in the visible regime, the required width of the QPM pattern for phase-matching compensation is very small and is currently beyond the limits of most fabrication methods.Abstract We experimentally demonstrate a method for creating broad bandwidth photon pairs in the visible spectral region, centered at a frequency that is higher than that of the initial pump source. Spontaneous down conversion of a narrowband 1053 nm pulsed Nd:YLF laser is followed by highly efficient upconversion in adiabatic nonlinear frequency-conversion process. Photon pairs are generated from 693 to 708 nm, and the complete conversion process occurs within a single monolithic 5-cm-long stoichiometric lithium tantalate nonlinear crystal. We have characterized the dependence of this structure with respect to pump intensity and crystal temperature.Spontaneous parametric down conversion (SPDC) plays a key role in nonlinear and quantum optics as it enables amplification of broadband, tunable light in optical parametric oscillators and the reliable generation of entangled photon pairs [1,2]. SPDC originates from the stimulation of random vacuum fluctuations, induced by a strong pump in a optical parametric generation (OPG) process [3]. In this process, the pump photon at ω p spontaneously splits into two photons, the signal at ω 1 and the idler at ω ...

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“…For the sake of definiteness, we will consider here the SFG case, however a similar analysis holds for the DFG scheme. In the undepleted pump approximation, SFG is described by the linear coupled equations [26,27] …”

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confidence: 99%

Nonlinear adiabatic optical isolator

Rangelov

Longhi

2017

Appl. Opt.

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We theoretically propose a method for optical isolation based on adiabatic nonlinear sum frequency generation in a chirped quasi-phase-matching crystal with strong absorption at the generated sum frequency wave. The method does not suffer from limitations of dynamic reciprocity found in other nonlinear optical isolation methods, and can provide tunable optical isolation with ultrafast all-optical switching capability. Moreover, as an adiabatic technique it is robust to variations in the optical design and is relatively broadband. c 2016 OCIS codes: 190.0190, 190.4223, 190.26201180.An optical isolator (optical diode) is the optical correspondent of electronic diode, allowing unidirectional non-reciprocal light transmission. These devices are widely used in optical telecommunications and laser applications to prevent the unwanted feedback that might be harmful to optical instruments and devices. Moreover, the use of an isolator generally improves the performance of an optical circuit as it suppresses spurious interferences, interactions between different devices and undesired light routing [1]. Currently, optical diodes rely almost exclusively on the Faraday effect where external magnetic fields are used to break time reversal symmetry [2]. However, optical isolators based on the Faraday effect are typically large-size devices, they cannot be implemented easily in on-chip integrated systems [3], and do not provide dynamic optical isolation with all-optical switching capability, which is desirable in advanced optical signal processing.Several recent works have suggested and experimentally demonstrated new ways to realize optical isolators that do not rely on magneto-optical effects [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Dynamic modulation methods, which enable tunable optical isolation with all-optical switching capabilities, have been recently proposed and experimentally demonstrated using liquid-crystal heterojunctions [7], phase modulators in InP and silicon photonics [9, 10], optoacoustic photonic crystal fibers [11], and traveling-wave Mach-Zehnder modulators [12]. A broad class of optical isolators is the one based on nonlinear interaction of light in a nonlinear medium, which breaks Lorentz reciprocity. Nonlinear optical isolators have raised great attention since more than two decades [4][5][6][13][14][15][16][17][18][19], mainly because of their all-optical switching capability exploiting the ultrafast response of the nonlinear medium and for on-chip integration possibilities. However, their effectiveness in optical isolation has been recently questioned owing of the appearance of so-called dynamical reciprocity [20]. In a nonlinear optical isolator, non-reciprocal transmission contrast is observed when strong waves are injected in forward or backward directions, however optical isolation is constrained by a reciprocity relation for a class of small-amplitude additional waves that can be transmitted.In this Letter we suggest a different route toward nonlinear optical isolation, which...

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Adiabatic processes in frequency conversion

Cited by 143 publications

References 68 publications

Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction

Theory of second-harmonic generation in a chirped 2D nonlinear optical superlattice under nonlinear Raman-Nath diffraction

Broadband photon pair generation at 3ω/2

Nonlinear adiabatic optical isolator

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