Second harmonic generation in a high-Q lithium niobate microre-sonator fabricated by femtosecond laser micromachining

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SCIENCE CHINA Physics, Mechanics & Astronomy
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SCIENCE CHINA Physics, Mechanics & Astronomy, Volume 58, Issue 11: 114209(2015) https://doi.org/10.1007/s11433-015-5728-x

Second harmonic generation in a high-Q lithium niobate microre-sonator fabricated by femtosecond laser micromachining

JinTian LIN, YingXin XU, ZhiWei FANG, Min WANG, NengWen WANG, LingLing QIAO, Wei FANG, Ya CHENG
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  • ReceivedJun 29, 2015
  • AcceptedAug 10, 2015
  • PublishedSep 25, 2015
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Abstract

We report on second harmonic generation (SHG) in on-chip high-Q (>105) lithium niobate (LiNbO3, LN) microresonators fabricated by femtosecond laser micromachining. We examine the efficiency of SHG with either a continuous-wave (CW) or an ultrashort pulsed pump laser. The normalized conversion efficiencies of SHG obtained with the CW and pulsed pump lasers are measured to be 1.35×10-5 m W-1 and 2.30×10-6 m W-1, respectively.


Funded by

and the Fundamental Research Funds for the Central Universities.

National Key Basic Research Program of China(2014CB921300)

National Natural Science Foundation of China(61275205)


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    Figure 1

    (Color online) (a) The SEM image of the fabricated LN resonator with diameter ~82 μm; (b) the transmission spectrum (black dot) of the fiber taper coupling with microresonator around the wavelength of 1540 nm, and the Q factor was inferred by the Lorentz fitting (red solid line).

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    Figure 2

    (Color online) (a), (b) The spectra of pump and generated second harmonic (SH) signals collected from the output port of the fiber taper; (c) optical microscope side view image of the second harmonic emission (the violet light) from the microresonator; (d) SHG conversion efficiency as a function of input pump power.

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    Figure 3

    (Color online) (a) The transmission spectrum of pump laser coupled with the microresonator by fiber taper; (b) the spectrum of second harmonic signal collected by the grating spectrometer (model Du920, Andor); (c) optical microscope side view image of the second harmonic emission from the microresonator; (d) conversion efficiency of SHG as a function of the input pump power.

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