Synchronized generation of 1534 and 1572 nm by the mixed optical parameter oscillation

Abstract

A novel nonlinear frequency conversion process was demonstrated to realize the synchronized dual‐wavelength emissions at 1534 and 1572 nm by the mixed optical parametric oscillation (OPO) conversion in gray‐tracking‐resistance KTP (GTR‐KTP) and KTA crystals. Both the two crystals were inserted into the diode‐pumped Nd:YAG/Cr4+:YAG fundamental resonator, with their Y axes perpendicular to each other. This could eliminate the competition of the two OPO processes in fundamental radiation. Furthermore, the ratio between the length of GTR‐KTP and KTA has also been specially designed to satisfy the same OPO thresholds. The synchronized dualwavelength lasing with the power ratio of 1:1 between 1534 and 1572 nm was successfully realized. At an incident LD pump power of 7 W, the maximum total output power of 460 mW was achieved, with the corresponding pulse width and repetition rate measured to be 3.9 ns and 5.5 kHz, respectively. This mixed conversion opens a new door for the multi‐wavelength lasing. (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)

Multi-Watt Simultaneous Orthogonally Polarized Dual-Wavelength Pulse Generation of an Intracavity Nd:YLF/YVO4 Raman Laser

“…In addition, the nonlinear frequency conversion technology, such as optical parametric oscillator (OPO) and stimulated Raman scattering (SRS), is another effective approach to extend the available spectral range of the orthogonally polarized dual-wavelength laser. By virtue of the dual-wavelength OPO technique, researchers have obtained the simultaneous orthogonally polarized dual-wavelength laser output at 1.5 and 2.0 μm [14], [15]. But OPO requires phase-matching and working near damage threshold for many nonlinear optical crystals, which make the system unstable and inconvenient [16].…”

Stable dual-wavelength single-longitudinal-mode ring erbium-doped fiber laser for optical generation of microwave frequency

“…Since the homogeneous gain broadening of the EDF at room temperature, it is necessary to improve the inhomogeneity and suppress the mode hopping between the adjacent modes. So many techniques have been proposed to achieve stable dual wavelength oscillations, such as incorporating a semiconductor optical amplifier in the ring cavity [4,5], utilizing nonlinear effects by using the mixed opti cal parameter oscillation [6,7] or high nonlinear pho tonic crystal fiber [8,9], passively mode locked all fiber ring dual wavelength laser [10,11], inserting a phase modulator or frequency shifter into the laser cavity [12], two tunable bandpass filters (TBFs) inside ring gain cavity [13,14], etc. The fiber Bragg gratings (FBGs) as the wavelength selective elements could significantly broaden the output wavelength range and enhance the wavelength stability [15][16][17].…”

Improvement of stability and efficiency in diode-pumped passively Q-switched intracavity optical parametric oscillator with a monolithic cavity

“…The output power is therefore very sensitive to the alignment of the shared output coupler and is difficult to optimize. The power instability and the diode-to-signal conversion efficiency were 1.72% and 3.70% for an Nd:YAG/KTA laser by Zhang et al [1], 1.2 and 6.5% for an Nd:YAG/KTP/KTA laser by Huang et al [6], and 4% together with 18% for an Nd:YVO 4 /KTA laser by Zhu et al [7]. It is practically important to improve the stability and attain high efficiency simultaneously in diode-pumped IOPOs.…”