Optical Parametric Oscillator Based on All-Optical Poled Silicon Nitride

Quasi-phase matching optical parametric oscillators (OPOs) are widely used for mid-infrared laser generation. However, the traditional OPO bulk material using high voltage electric field poling limits the flexibility of the poling period. In this paper, we propose a novel OPO design based on all-optical poled silicon nitride, allowing for adjustable poling period. Two OPO design schemes are presented, each offering unique advantages in terms of operational characteristics and performance. The output characteristics of the OPO are investigated in three modes: OPO pump tuning, poling fundamental wave (PFW) tuning, and OPO pump tuning and PFW tuning with the same laser. For OPO pump tuning, the OPO achieves output wavelengths of 3.319-
$5.265 ~\mu \text{m}$
and 2.225-
$3.769 ~\mu \text{m}$
with PFW wavelengths of 1450 nm and 1700 nm. For PFW tuning, the OPO produces output wavelengths of 5.502-
$3.722 ~\mu \text{m}$
and 5.497-
$3.577 ~\mu \text{m}$
using OPO pump wavelengths of 1310 nm and 1654 nm, respectively. Furthermore, for OPO pump tuning and PFW tuning with the same laser, the OPO generates output wavelengths ranging from
$5.504 ~\mu \text{m}$
to
$3.941 ~\mu \text{m}$
with OPO pump and PFW wavelengths ranging from
$1.420 ~\mu \text{m}$
to
$1.610 ~\mu \text{m}$
. This new OPO design offers enhanced flexibility in controlling the poling period for efficient mid-infrared laser generation.