Ultraviolet generation in periodically poled lithium tantalate waveguides

Busacca, Alessandro; D'Asaro, Elena; Pasquazi, Alessia; Stivala, Salvatore; Assanto, Gaetano

doi:10.1063/1.2992201

Cited by 22 publications

(18 citation statements)

References 17 publications

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“…The poling dynamics is such that the first enucleated (inverted) domains spread in the xy crystal plane and become wider than those generated later. Despite the dominant role of the 2.0 m periodic electrode pattern in defining the ferroelectric grating (as demonstrated by the firstorder QPM-SHG on similar substrates [19]), the final MTSR has nonuniform stochastic features superimposed to the regular pattern.…”

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Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate

et al. 2010

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We observe second harmonic generation via random quasi-phase-matching in a 2.0 m periodically poled, 1-cm-long, z-cut lithium tantalate. Away from resonance, the harmonic output profiles exhibit a characteristic pattern stemming from a stochastic domain distribution and a quadratic growth with the fundamental excitation, as well as a broadband spectral response. The results are in good agreement with a simple model and numerical simulations in the undepleted regime, assuming an anisotropic spread of the random nonlinear component. © 2010 Optical Society of America OCIS codes: 190.0190, 190.2620 Parametric wavelength conversion in media with a random nonlinearity, discussed in the pioneering works by Freund [1] and by Dolino and coworkers [2], has recently attracted significant interest due to its nonresonant behavior, i.e., its low sensitivity to phase matching and its broadband response [3][4][5][6][7][8][9]; potential applications have also been investigated, such as the time-domain characterization of femtosecond pulses [10]. Moreover, in connection with quasi-periodicity, a few important aspects of nonlinear wave mixing and transverse phase matching have been unveiled [11][12][13][14]. Broadband frequency conversion can take place in both isotropic polycrystalline ferroelectrics [3] and in crystals with randomly distributed antiparallel ferroelectric micro-domains [5,6]; the former are easily accessible and support a linear trend in terms of the generated second harmonic (SH) versus the input fundamental power, while the latter exhibit the standard quadratic dependence of the generated SH versus the input fundamental power, with higher conversion efficiencies. The presence of antiparallel ferroelectric domains can intrinsically depend on the specific growth technique, as is the case for strontium barium niobate (SBN, d 33 = 12 pm/V) [4]. Here, a random domain distribution is generated during boule preparation [7,11]. In SBN and with reference to SH generation, Horowitz and coworkers studied the role of microdomains superimposed to an ordered pattern [6]. In several ferroelectric crystals with a second-order susceptibility, however, electric field poling for quasiphase matching (QPM) via domain inversion is the most used approach for engineering nonlinear gratings and realizing a variety of bulk and guidedwave structures for signal processing based on frequency conversion [15,16]. An intense electric field applied across the thickness of a ferroelectric crystal relates to the probability of domain nucleation. Domain nucleation, however, is a stochastic process with a random trend due to various defects, including vacancies, impurities, ions in wrong lattice sites, etc.[17]. The random character becomes particularly relevant when the imposed (periodic) pattern has small features, with the final structure being prone to show a disordered two-dimensional distribution of markto-space-ratio (MTSR) superimposed to the grating defined by the electrode geometry.In this Letter we report on second-harmonic generation...

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Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate

et al. 2010

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“…A set of walk-off compensating crystals or a periodically poled crystal could be used as well. One candidate with high effective non-linearity and UV transparency is periodically poled lithium tantalate (pp-LiTaO 3 ) [11]. For a wavelength close to 350 nm the non-linear coefficient d eff for the periodically poled crystal is 4.4 pm/V, for Type I mixing in BBO it is 1.98 pm/V and for Type II 1.15 pm/V.…”

Section: Results and Comparison With Calculationsmentioning

confidence: 99%

Intracavity Frequency Doubling and Difference Frequency Mixing for Pulsed ns Ti:Sapphire Laser Systems at On-Line Radioactive Ion Beam Facilities

Sonnenschein

Moore²,

Pohjalainen³

et al. 2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

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Intra-cavity second harmonic generation of a Titanium:sapphire (Ti:sa) laser system has been used to improve the conversion efficiency to the second harmonic. Over the course of several experiments performance data spanning the whole wavelength range of a Ti:sa has been collected, which may be used as a guideline for future experiments. An average output power of up to 3.7 W was achieved, resulting in a conversion efficiency of >75 % to the second harmonic. A wavelength coverage from 340-525 nm has been demonstrated. To extend the wavelength range of the solid state laser system, difference frequency mixing has been applied to the intra-cavity doubled light and the fundamental output of a second Ti:sa laser. Up to 30 mW of yellow light at the sodium D2 line at 589 nm was generated. Based on numerical calculations this output power could still be improved by a factor of ten with simple changes in the experimental setup. Laser spectroscopy and measurement of the saturation behaviour has been carried out on an atomic beam of stable sodium.

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“…The poling dynamics is such that the first enucleated (inverted) domains spread in the x-y crystal plane and become wider than those generated later. Despite the dominant role of the periodic electrodes in defining the ferroelectric grating (as demonstrated by first-order QPM SHG on similar substrates [27]), the final MTSR has non-uniform stochastic features superimposed to the regular pattern. While this effect is known to always occur during electric-field poling, it becomes particularly relevant when the domain size (i.e., period) is small, as in our samples.…”

Section: Samples Fabrication and Nonlinear Characterizationmentioning

confidence: 99%

“…PP-QPM is also crucial towards signal processing via quadratic cascading [5][6][7][8][9][10][11][12][13][14], including transverse light localization [15][16][17][18], wavelength shifting [19][20][21], unidirectional optical transmission [22,23]. A few parametric applications, such as backward second-harmonic generation (SHG), counterpropagating optical parametric oscillations and ultraviolet generation, require short periodicities of the nonlinear coefficient distribution, often below 1μm [24][25][26][27]. Thus, great attention has been recently paid to small irregularities in the periodic pattern and how they can affect the performance of fabricated devices [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Features of randomized electric-field assisted domain inversion in lithium tantalate

Stivala¹,

Buccheri²,

Curcio³

et al. 2011

Opt. Express

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Abstract:We report on bulk and guided-wave second-harmonic generation via random Quasi-Phase-Matching in Lithium Tantalate. By acquiring the far-field profiles at several wavelengths, we extract statistical information on the distribution of the quadratic nonlinearity as well as its average period, both at the surface and in the bulk of the sample. By investigating the distribution in the two regions we demonstrate a non-invasive approach to the study of poling dynamics. tuning and tolerances," IEEE J. Quantum Electron. 28(11), 2631-2654 (1992). 2. M. Yamada, N. Nada, M. Saitoh, and K. Watanabe, "First order quasi-phase matched LiNbO3 waveguide periodically poled by applying an external field for efficient blue second harmonic generation," Appl. ©2011 Optical Society of America

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Ultraviolet generation in periodically poled lithium tantalate waveguides

Cited by 22 publications

References 17 publications

Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate

Random quasi-phase-matched second-harmonic generation in periodically poled lithium tantalate

Intracavity Frequency Doubling and Difference Frequency Mixing for Pulsed ns Ti:Sapphire Laser Systems at On-Line Radioactive Ion Beam Facilities

Features of randomized electric-field assisted domain inversion in lithium tantalate

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