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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 7,
  • Issue 11,
  • pp. 1038-1040
  • (2009)

Widely continuous-tunable 2.789-4.957 µm twin MgO:PPLN cascaded optical parametric oscillator

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Abstract

An all-solid-state mid-infrared optical parametric oscillator with wide tunability by using two identical multi-grating periodically poled 5-mol.-% MgO-doped lithium niobate cascaded is reported. The pump laser is an acousto-optically Q-switched Nd:YAG laser with 150-ns pulse width at repetition rate of 10 kHz. Wide tunability from 2.789 to 4.957 <i>µ</i>m at the idler wavelength is achieved by varying the temperature from 40 to 200 °C and translating the grating periods from 26 to 31 \mu m with a step of 0.5 <i>µ</i>m. When the incident pump average power is 8.15 W, the maximum idler output average power is 2.23 W at 3.344 <i>µ</i>m and the optic-optic conversion efficiency is about 27.4%.

© 2009 Chinese Optics Letters

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