Tunable near-infrared and mid-infrared radiations have drawn enormous interest and obtained a variety of applications,
such as, molecular analysis, remote sensing, laser radar, material spectroscopy, air pollution detection and so on. The
periodically poled lithium niobate (PPLN) crystal is a suitable material to realize the infrared solid-state lasers. A QPM
singly resonant OPO based on PPLN crystal is experimentally demonstrated and the measured results are reported in this
paper. The OPO system is pumped by a commercial acousto-optically Q-switched Nd:YAG laser. Its output wavelength
is 1.064 μm, pulse duration of 150 ns at a repetition rate of 10 kHz. A maximum laser output power of 1.23W at the idler
wavelength of 3.09 μm has been obtained for the OPO when the pump power is 8.15 W. And now the optic - optic
conversion efficiency is 15.1%. The widely tunable mid-infrared ranges of 2.80-3.17 μm, 3.34-3.60 μm, 3.77-3.97 μm,
4.15-4.32 μm, and 4.48-4.62 μm are obtained by changing both the crystal's temperature from 40 to 200 °C and grating
periods from 26.5 μm to 30.5 μm.
A QPM singly resonant OPO based on MgO-doped PPLN crystal is experimentally demonstrated and the measured
results are presented in this paper, too. The pump source is also the acousto-optically Q-switched Nd:YAG laser. A
maximum laser output power of 2.17 W at the idler wavelength of 3.33 μm has been obtained for the OPO when the pump power is 8.15 W. And now the optic - optic conversion efficiency is 26.7%. The tunable mid-infrared ranges are 2.83-2.89 μm, 3.10-3.38 μm, 3.57-3.78 μm, 3.95-4.12 μm, 4.28-4.46 μm, and 4.65-4.79 μm. Compared to PPLN crystal, we can obtain higher idler output power and optic - optic conversion efficiency by using MgO-doped PPLN crystal.
In this report, a required aperiodically poled structure is designed, where two quasi-phase-matched conditions of optical
parametric oscillator and frequency difference are required to be satisfied simultaneously. By numerical simulation, we
analyze the effects of crystal structure, the cavity parameter of optical parametric oscillator, and terahertz absorption
coefficient on terahertz generation. And, the terahertz wave is generated via cascaded processes, which is of great
interest in fundamental and applied sciences, and is a great demand for many applications in spectroscopy, sensing,
communication, medial diagnoses and biomedical imaging. In addition, the design method for poled ferroelectric crystal
is universal and applicable to many other fields, particularly in those processes where multiple quasi-phase-matched
conditions are required to be satisfied simultaneously.
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