LD Side Pumped Er3+, Yb3+ : Glass Waveguide Passively Q-Switched Laser

LD side pumped Er3+, Yb3+ : glass waveguide passively Q-switched laser was reported. By adhesive-free bonding techniques, Co-doped borosilicate glass with a thickness of 0. 1 mm was bonded on four sides of the core (atom fraction 1% Er3+,21% Yb3+ : glass) of waveguide. The aim was to block the formation pathway of amplified spontaneous emission (ASE) and improve the output efficiency of laser. In order to improve the pump uniformity and output beam quality of laser, K9 borosilicate optical glass was bonded on both sides of waveguide as the transmission layer of pump. In free-running mode, laser output was obtained with the maximum pulse energy of 34. 7 mJ and the slope efficiency of 10. 6%. In passively Q-switched mode, a pulse laser was achieved with wavelength of 1. 535 mu m, single pulse energy of 2. 16 mJ, pulse width of 4. 7 ns, peak power of 459 kW, and beam quality factor M-2= 1. 53. Experimental results demonstrate that the bonding of Co2+ : glass on the four sides of Er3+, Yb3+ : glass is an effective method to inhibit ASE effect and improve the output pulse energy of laser.