Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A narrow-linewidth MgO:PPLN optical parametric oscillator (OPO) with two volume-Bragg-grating (VBG) mirrors in a linear cavity configuration is presented. The OPO was pumped at 1064 nm, generating an idler wave near 2.5 <formula formulatype="inline"><tex>$\mu{\hbox {m}}$</tex></formula>. The OPO performance in the two-VBG-mirror cavity is compared with its performance in other mirror combinations. Nearly 0.5-W output in a single longitudinal mode was obtained. The narrowest linewidth of 2 GHz was obtained when the two VBG mirrors were slightly detuned from one another. </para>
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