Optimized domain-engineered lithium niobate for electro-optic spectral tuning in a multi-wavelength optical parametric oscillator

Lin Ming Deng, Shue Shan Lin, Tien Dat Pham, Yen Hung Chen

Research output: Contribution to journalArticlepeer-review

Abstract

We report on an electro-optically (EO) spectrum tunable, multiline optical parametric oscillator (OPO) based on a nonperiodically poled lithium niobate (NPPLN). Besides being an efficient optical parametric down converter (OPDC) for multi-wavelength signal generation, the NPPLN can function as an EO modulator for fast spectral tuning based on a unique asymmetric-duty-cycle (ADC) equivalent domain structure. We have developed a genetic algorithm to construct and optimize such an ADC equivalent domain configuration in NPPLN to maximize its EO spectral tuning rate with the least compromise of its nonlinear gain for conducting the multiple down-conversions. When the novel EO NPPLN device with an equivalent ADC of 29%/71% works in an OPO intracavity pumped by a diode-pumped, 1064-nm Nd:YVO4 laser, we measured EO tuning rates of ∼0.5 and ∼0.53 nm/(kV/mm) for the down-converted dual signals at 1540 and 1550 nm, respectively. The tuning rates have been three orders of magnitude higher than a conventional one without an engineered domain asymmetry and 12% greater than another domain asymmetric LN device designed by a simulated annealing optimization method. The EO tuning technology developed in this study can be potentially implemented in micro/nano-photonic LN waveguide circuits.

Original languageEnglish
Article number131129
JournalOptics Communications
Volume574
DOIs
StatePublished - 1 Jan 2025

Keywords

  • Electro-optic spectral tuning
  • Multiline optical parametric oscillator
  • Nonperiodically poled lithium niobate

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