Abstract
We report a continuous-wave single-frequency singly-resonant mid-infrared optical parametric oscillator (OPO). The OPO is based on 5 mol % MgO-doped periodically poled lithium niobate (MgO:PPLN) pumped by a continuous-wave single-frequency Nd:YVO4 laser at 1064 nm. A four-mirror bow-tie ring cavity configuration is adopted. A low-finesse intracavity etalon is utilized to compress the linewidth of the resonant signal. A single-frequency idler output power higher than 1 W at 3.68 µm is obtained.
Highlights
Tunable laser sources in the mid-infrared range are widely used in laser spectroscopy, atmospheric pollution monitoring, remote detection, and differential absorption lidar
Reflecting volume Bragg gratings (VBGs) have been widely singly-resonant CW optical parametric oscillator (OPO) operating without mode hops for several hours due to the good thermal used in laser devices to obtain a narrow linewidth output
We report our experimental work on a CW single-frequency MgO-doped periodically poled lithium niobate (MgO):periodically poled LiNbO3 (PPLN) OPO
Summary
Tunable laser sources in the mid-infrared range are widely used in laser spectroscopy, atmospheric pollution monitoring, remote detection, and differential absorption lidar. To obtain a narrow linewidth idler output from an OPO, a narrow linewidth pump laser source utilized to suppress the linewidth of the oscillated signal in the OPO cavity. Reflecting volume Bragg gratings (VBGs) have been widely singly-resonant CW OPO operating without mode hops for several hours due to the good thermal used in laser devices to obtain a narrow linewidth output. Reflecting volume Bragg gratings (VBGs) have been widely singly-resonant CW OPO with optimum extraction efficiency, in which a single-longitudinal-mode used in laser devices to obtain a narrow linewidth output. Xing et al, devised self-seeding dual etalon-coupled cavities in the OPO signal output was obtained by employing a variable-reflectivity VBG as the output coupler of a ring system pumped by a single-longitudinal-mode pulsed Yb-fiber laser. Wavelength tuning can be achieved through thermal control of the nonlinear crystal and use of the different grating periods
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