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http://dx.doi.org/10.3807/COPP.2019.3.6.577

Mid-infrared Continuous-wave Optical Parametric Oscillator with a Fan-out Grating MgO:PPLN Operating Up to 5.3 ㎛  

Bae, In-Ho (Division of Physical Metrology, Korea Research Institute of Standards and Science)
Yoo, Jae-Keun (Division of Physical Metrology, Korea Research Institute of Standards and Science)
Lim, Sun Do (Division of Physical Metrology, Korea Research Institute of Standards and Science)
Kim, Seung Kwan (Quantum Technology Institute, Korea Research Institute of Standards and Science)
Lee, Dong-Hoon (Division of Physical Metrology, Korea Research Institute of Standards and Science)
Publication Information
Current Optics and Photonics / v.3, no.6, 2019 , pp. 577-582 More about this Journal
Abstract
We report on a continuous-wave (cw) optical parametric oscillator (OPO) optimized for mid-infrared emission above 5.0 ㎛. The OPO is based on a magnesium-oxide-doped periodically poled LiNbO3(MgO:PPLN) crystal with a fan-out grating design. A linear two-mirror cavity resonating both at the pump and signal wavelengths is stabilized to the pump laser by using the modified Pound-Drever-Hall (PDH) method. The idler wavelength is continuously tunable from 4.7 ㎛ up to 5.3 ㎛ by varying the poling period of the fan-out grating crystal. Pumped by a diode-pumped solid state (DPSS) laser with a power of 1.1 W at 1064 nm, the maximum idler output power is measured to be 5.3 mW at 4.8 ㎛. The output power above 5.0 ㎛ is reduced to the hundreds of ㎼ level due to increased absorption in the crystal, but is stable and strong enough to be measured with a conventional detector.
Keywords
Optical parametric oscillator; Mid-infrared laser; PPLN crystals;
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