Since both the laser crystal and the frequency conversion crystal have a certain damage threshold, the ultraviolet frequency conversion crystal is easily damaged by ultraviolet light during use. The area of the crystal damaged by the ultraviolet beam only accounts for a small part of the cross-sectional area of the crystal, but the laser pointer still needs to be repaired or replaced, which causes a lot of waste of manpower and material resources and shortens the overall service life of the solid-state ultraviolet laser. Can not meet the requirements of long-term stable operation.
On the basis of cavity design, frequency doubling control, intracavity thermal compensation and cooling control, etc., by adding a deflection mechanism in the cavity, the frequency doubling crystal is shifted every time during the laser use process to avoid the long-term effect of the optical path. At the same point on the frequency doubling crystal, the service life of the short-wave ultraviolet laser is doubled.
A short-wave ultraviolet 261 nm band continuous operation laser, with a center wavelength of 261.37 nm, a green laser pointer output power of more than 100 mW, a laser power stability better than 1%, and a laser amplitude noise better than 0.5%. The laser has the characteristics of excellent laser performance (including laser power, stability, beam quality, service life and other indicators), simple structure, and strong environmental adaptability (including shock resistance, high temperature resistance, moisture resistance, etc.).
Short-wave UV lasers are emerging new applications in the field of Raman spectroscopy. Ultraviolet Raman spectroscopy avoids fluorescence interference and has high sensitivity, and the Raman signal can be enhanced by the resonance Raman signal, which is broadened to a large extent. The application of Raman spectroscopy in physics, chemistry, biology, materials and other fields. The Li Can group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences used a UV-F-261 short-wave continuous ultraviolet laser for the structure, synthesis, catalytic characterization and in-situ characterization of molecular sieves and heteroatom molecular sieves, and achieved important results.