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Communication Dans Un Congrès Année : 2017

SHG using different combination of modal and quasi- phase matching in PPLN waveguides

Résumé

Theoretically, increasing the mode confinement is the way to go to improve the nonlinear efficiency, and we are actively working in this direction [1], but up to know there are still fabrications issues to solve to get low loss, highly confining waveguides with preserved nonlinearities in PPLN. Therefore, we are still intensively studying the SPE technique and despite our experience and the numerous devices we have been able to develop for Quantum Communications [2], precisely controlling the spectrum and the efficiency in SHG experiments is still an issue. Our devices are designed to be used at low CW power, but in order to characterise them more precisely, we add a characterisation step using a pulsed OPO NT242 from EKSPLA which emits 5ns pulses at 1kHz rep. rate and is tuneable from 210 to 2600 nm. Using a 1.5 cm long sample in which the PPLN section obtained by e-beam writing [3] was 1.5mm long and the waveguides produced by the SPE process using a proton source composed of Benzoic Acid and 3.1% Lithium Benzoate melted at 300°C, we obtained the normalized spectra reported in fig.1a. In this picture, we can see that we obtained the same results with the OPO and with a tuneable monomode CW laser (Tunics T100S-HP). (a) (b) Fig. 1. (a) Comparison of the SHG normalized spectra obtained with the OPO and a CW monomode tunable laser and (b) SHG spectra showing the harmonic signal obtained with different combinations of modal and quasi-phase matching. Using an intense broadly tuneable source, we expected to find the different combinations of modal and quasi-phase matching which can be observed in fig. 1b. The signal observed for a pump wavelength of 1.55 µm correspond to the interaction
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Dates et versions

hal-01644003 , version 1 (21-11-2017)

Identifiants

  • HAL Id : hal-01644003 , version 1

Citer

M Neradovskiy, E Neradovskaya, D Chezganov, L Gimadeeva, E Vlasov, et al.. SHG using different combination of modal and quasi- phase matching in PPLN waveguides. European Conference on Integrated Optics, Apr 2017, Eindhoven, Netherlands. ⟨hal-01644003⟩
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