Red and green dual-wavelength laser based on LD side-pumped ceramic Nd:YAG and BBO electro-optical Q-switch

A Laser diode (LD) side-pumped ceramic Nd:YAG laser was developed to achieve dual wavelength output at 532 nm and 660 nm, based on LiB3O5 (LBO) intracavity frequency doubling with the method of β-BaB2O4 (BBO) electro-optical Q-switching (EO Q-switching). In the experiment, a T-shaped cavity is designed for laser oscillate to reach the maximum output power of 8.32 W at 532 nm and 4.2 W at 660 nm simultaneously; and also, the pulse widths could reach to 88.6 ns at 532 nm and 96 ns at 660 nm with the repetition rate of 10 kHz. The beam quality factors (M2) could be measured as Mx2=4.36, My2=4.78 at 532 nm and Mx2=5.46, My2=5.83 at 660 nm. Both the power instabilities of the two output wavelengths are less than 2% in 10 h measured at every 1 h. All of the EO Q-switching technique, oscillation cavity design and laser gain media, used in this work, illustrate a valid way to develop a dual-wavelength laser with high output peak power.

► Side-pumped ceramic Nd:YAG based on BBO electro-optical Q-Switching designed a T-shaped compound-cavity.
► The narrow pulse width of 532 nm and 660 nm are achieved with the same repetition rate.
► High peak power and high single pulse energy of 532 nm and 660 nm achieved simultaneously.
► Good beam quality is obtained in the experiment.