Compact wavelength tunable output around 440 nm pulsed laser for oceanic lidar application

All-solid-state far-UVC pulse laser at 222 nm wavelength for UVC disinfection

“…Two 5 mm × 3 mm × 10 mm type-I phase matching BBO crystals cut at θ = 29.6°, ϕ = 90°were inserted in this OPO as parametric crystals. In order to compensate the walk-off effect, two BBO crystals were placed cross symmetrically, similar to what was mentioned by Zhang et al [20] . Wavelength tuning output of the OPO could be obtained by rotating those two BBO crystals symmetrically.…”

Development of single-resonant optical parametric oscillator with tunable output from 410 nm to 630 nm

“…where M is a coefficient related to the reflectivity of the OC and the loss of OPO, and N is the ratio of the pump energy to the pump threshold energy. Equation (1) shows that high conversion efficiency is attributed to a large N value. The pump threshold energy is limited by parametric gain length L, which is defined by…”

“…The blue-green spectrum is the optical transmission window of seawater, which can be used for underwater laser communication, laser bathymetry, and ocean LIDAR. The attenuation coefficient varies from different types of seawater, and the optimal wavelengths for laser detection in deep seawater are between 420 nm and 510 nm, while the optimal wavelengths for coastal seawater are between 520 nm and 580 nm [1][2][3][4][5] . As is known [6] , an optical parametric oscillator (OPO) pumped by a solid-state laser is regarded as a promising tunable laser source.…”