Diode-pumped Nd:YAG/BiB₃O₆deep-blue laser at 449.5 nm

Abstract

We report a diode-pumped Nd:YAG laser emitting at 899 nm based on the 4 F 3/2 -4 I 9/2 transition. A power of 1.04 W at 899 nm has been achieved in continuous-wave operation with a fiber-coupled laser diode emitting 19.2 W at 809 nm. Furthermore, intracavity second-harmonic generation in continuouswave mode has also been demonstrated with a power of 284 mW at 449.5 nm by using a BiB 3 O 6 (BiBO) nonlinear crystal. The fluctuation of the blue output power was better than 2.8%. The beam quality M 2 value is 1.3.

Low‐wavelength emission of Nd‐doped lasers

“…3). Only one output in the blue can be achieved if the Bragg mirror has two sections: one highly reflective at the fundamental wavelength and the [20] 427 nm 13 mW Nd:YAG + BiBO (SHG) [46] 434.5 nm 118 mW Nd:YAG + BiBO (SHG) [49] 449.5 nm 300 mW Nd:GdVO 4 + KNbO 3 (SHG) [48] 439.5 nm 300 mW Laser diode [51] 405 nm 120 mW Laser diode [51] 440 nm 50 mW Helium-cadmium [52] 442 nm 180 mW other one highly reflective for the second harmonic. A more compact system could be also a microchip laser in which all the optical pieces are contacted together.…”

“…After this first demonstration, the design has been improved by another research team [49]: the pump power is doubled and the nonlinear crystal used is a BiBO. Indeed, Table 2 shows that the nonlinear properties of BiBO are better than LBO for the second-harmonic generation at 449.5 nm.…”

Short pulse width UV laser at 355 nm based on pulse LD side-pumped ceramic Nd:YAG and BBO electro-optical Q-switched

“…At the same time, using a laser beam analyser (ModeScan Model 1780), wavelength outputs at 1064, 532, and 355 nm laser was obtained with a respective X axis factor of 5.83, 4.25, and 6.32, and Y axis factor of 5.61, 4.08, and 6.15. This is due to rela tive to the intracavity frequency changes process of multiple entries [23][24][25][26], extracavity one way nonlin ear frequency change process is not conducive to the Output power of 335 nm UV laser, mW improvement of the laser mode, resulting in relatively poor quality of the SHG laser beam and SFG laser beam.…”

Diode-pumped Nd:YVO4/BiBO blue laser at 440 nm

“…1. The lowest wavelengths ever reported with diode-pumped solid-state lasers based on Nd ions are 879 nm with Nd:GdVO 4 [23] and 884-889 nm with Nd:YAG [24,25].…”