Efficient continuous-wave intracavity frequency-doubled Nd:YAG-LBO blue laser at 473 nm under diode pumping directly into the emitting level

Abstract

Abstract:We report the efficient blue laser at 473 nm generation by intracavity frequency doubling of a continuous wave laser operation of a 885 nm diode direct pumped Nd:YAG laser on the 4 F 3/2 → 4 I 9/2 transition at 946 nm. A LiB 3 O 5 (LBO) crystal, cut for critical type I phase matching at room temperature is used for second harmonic generation of the laser. At the absorbed pump power of 18.7 W, as high as 4.3 W of continuous wave output power at 473 nm is achieved with 15 mm long LBO. The optical-to-optical conversion efficiency with respect to the absorbed power is up to 0.23, and the beam quality M 2 value is 1.2.Beam profile distribution of 473 nm blue laser

Optimizing the mode-to-pump ratio in end-pumped quasi-three-level Nd-doped lasers considering the energy-transfer upconversion

“…As efficient lasing on the quasi-three-level ( 4 F 3/2 → 4 I 9/2 ) at 900-950 nm in an Nd-doped crystal is difficult to achieve because of the significant reabsorption loss and the lower stimulated emission cross section [1][2][3][4], several methods were used to improve the laser performance, such as optimizing the laser length [5], using a composited laser rod [6] and efficient cooling schemes [7], diode pumping directly into the emitting level [8], and using ceramic Nd:YAG [9,10]. Another factor that limits the scaling of the laser output power at 1 Author to whom any correspondence should be addressed.…”

Sodium D2resonance radiation based on intracavity sum-frequency-mixing laser operation in Nd:GdVO4–Nd:YLiF4crystals

“…Lasers emitting in the visible range are useful in many fields, such as medicine, lithography, communications, displays or biology [1][2][3][4][5][6][7]. In the past few years, new solid-state lasers were designed to enlarge the range of wavelengths, for example, in the yellow region of the spectrum [8,9], or to improve sources that have already been used, such as in the blue region of the spectrum [10,11].…”