Laser Crystals and Components
Periodically Poled Lithium Niobate (PPLN) Crystal is a type of non-linear optical crystal with distinguished high conversion efficiencies and a wide transparent spectrum of 0.4-5μm. The periodic domain structures of the PPLN crystals are patterned through a process of inverting the crystal dipole moment using a high-voltage electric field. The introduction of MgO dopants is achieved through controlled thermal diffusion or ion implantation, ensuring uniform distribution within the crystal lattice. The 5% MgO doping in LiNbO3 improves the damage threshold of the PPLN to a significant extent and broadens its phase-matching bandwidth. MgO: PPLN crystals exhibit a unique quasi-phase-matching (QPM) phenomenon, which allows the utilization of a higher nonlinear coefficient than in the case of birefringent phase matching, other important merits of QPM also include convenient temperature environment and the absence of spatial walk-off. PPLN are excellent for a diverse range of nonlinear interactions such as Second Harmonic Generation (SHG), Sum Frequency Generation (SFG), etc. through precise engineering of the crystal's domain structure. An optical waveguide is an inhomogeneous structure for guiding light, i.e. for restricting the spatial region in which light can propagate.
As a general principle, PPLN bulk crystal chips are straightforward to handle and can withstand higher power levels (Watts), whereas PPLN waveguides excel in conversion efficiency but present greater challenges in light coupling.
A mGreen module is a single integrated component for green light generation. By pumping the mGreen with an 808nm laser diode, the user can obtain green light output.
A MgO:PPLN laser module contains a MgO:PPLN waveguide integrated with pumping laser diodes, laser gain media such as Nd:YVO4 or Nd:YAG, and other optics.
Shalom EO offers standard and off-the-shelf MgO:PPLN bulk crystal chips, MgO:PPLN waveguides, mGreen Modules, and MgO:PPLN laser modules. Our MgO:PPLN crystals and waveguides feature high damage threshold, exceptional optical transmittance, and thermal conductivity, rendering them robust candidates for high power applications and various frequency conversion processes including up-conversion (SHG/SFG) and down-conversion (DFG/OPA/OPG/OPO). The wavelength range spans from visible to mid-IR, and the QPM structure can be selected. Shalom EO also supplies mGreen modules producing 532nm and 561nm green light, boasting high output power and compact dimension. Besides, We provide MgO:PPLN laser modules of 473nm, 532nm,545nm, 561nm, and 671nm wavelengths.
