Abstract

We present an efficient and tunable source generating multi-watt single-frequency red radiation by intra-cavity frequency doubling of the signal in a MgO-doped periodically poled ${\mathrm{LiNbO}}_3$ (MgO:PPLN)-based singly resonant optical parametric oscillator (SRO). By optimally designing the SRO cavity in a six-mirror configuration, we generate $\approx 276\mathrm{nm}$ tunable idler radiation in mid-infrared with a maximum power of $P_i=2.05\mathrm{W}$ at a pump power of $P_p=14.0\mathrm{W}$. The resonant signal is frequency doubled using a 10 mm-long ${\mathrm{BiB}}_3{\mathrm{O}}_6$ (BiBO) crystal which resulted in tunability of a red beam from $\approx 753$ to 780 nm band with maximum power $P_r\approx 4.0\mathrm{W}$ recorded at ${\lambda }_r\approx 756\mathrm{nm}$. The deployment of a six-mirror SRO ensures single-frequency generation of red across the entire tuning range by inducing additional losses to Raman modes of ${\mathrm{LiNbO}}_3$ and, thus, inhibiting their oscillation. Using a scanning Fabry–Perot interferometer (FPI), nominal linewidth of the red beam is measured to $\approx 3\mathrm{MHz}$ which changes marginally over the entire tuning range. Long-term (over 1 h) peak-to-peak frequency fluctuation of the generated red beam is estimated to be about 3.3 GHz under free-running conditions at $P_p=14.0\mathrm{W}$. The generated red beam is delivered in a ${\mathrm{TEM}}_{00}$ mode profile with $M^2\le 1.32$ at maximum power in a red beam.

© 2016 Optical Society of America

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