The formation of transverse modes in longitudinally pumped miniature slab lasers is investigated theoretically and experimentally. The longitudinally non-uniform gain-guiding is studied by expanding the electric field...The formation of transverse modes in longitudinally pumped miniature slab lasers is investigated theoretically and experimentally. The longitudinally non-uniform gain-guiding is studied by expanding the electric field into the Hermite-Gaussian functions that satisfy boundary conditions of the resonator. Non-Gaussian transversal beam profiles in the near field are found and the beam diameter is reduced when the pump spot becomes smaller. The experimental observation agrees with the theoretical calculation.展开更多
Nd-doped phosphate glass belt lasers pumped by laser diodes are demonstrated. The Nd-glass belt with a large cross-section and a small Fresnel number is air-cooled to provide around 18-W continuous wave （CW） output ...Nd-doped phosphate glass belt lasers pumped by laser diodes are demonstrated. The Nd-glass belt with a large cross-section and a small Fresnel number is air-cooled to provide around 18-W continuous wave （CW） output power with a beam quality factor of M2 × M2 = 16 × 3.2. With 6 pairs of V-grooves scribed on the edges of the glass belt, the beam quality is improved to My^2 × Mx^2 = 3.5 × 2.8 with output power of 13.5 W.展开更多
The concept of the beam propagation factor M^2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength. Using the new definition o...The concept of the beam propagation factor M^2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength. Using the new definition of factor M^2, the propagation of chromatic beams can be analyzed by the beam propagation factor M^2 as same as that of monochromatic beams. A simple method to measure the chromatic beam factor M^2 is demonstrated. The chromatic factor M^2 is found invariable while the laser beam propagates through the dispersion-free ABCD system.展开更多
文摘The formation of transverse modes in longitudinally pumped miniature slab lasers is investigated theoretically and experimentally. The longitudinally non-uniform gain-guiding is studied by expanding the electric field into the Hermite-Gaussian functions that satisfy boundary conditions of the resonator. Non-Gaussian transversal beam profiles in the near field are found and the beam diameter is reduced when the pump spot becomes smaller. The experimental observation agrees with the theoretical calculation.
文摘Nd-doped phosphate glass belt lasers pumped by laser diodes are demonstrated. The Nd-glass belt with a large cross-section and a small Fresnel number is air-cooled to provide around 18-W continuous wave （CW） output power with a beam quality factor of M2 × M2 = 16 × 3.2. With 6 pairs of V-grooves scribed on the edges of the glass belt, the beam quality is improved to My^2 × Mx^2 = 3.5 × 2.8 with output power of 13.5 W.
文摘The concept of the beam propagation factor M^2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength. Using the new definition of factor M^2, the propagation of chromatic beams can be analyzed by the beam propagation factor M^2 as same as that of monochromatic beams. A simple method to measure the chromatic beam factor M^2 is demonstrated. The chromatic factor M^2 is found invariable while the laser beam propagates through the dispersion-free ABCD system.
