Highly efficient single-pass frequency doubling of a continuous-wave distributed feedback laser diode using a PPLN waveguide crystal at 488 nm.
A continuous-wave distributed feedback diode laser emitting at 976 nm was frequency doubled by the use of a periodically poled lithium niobate waveguide crystal with a channel size of 3 microm x 5 microm and an interaction length of 10 mm. A laser to waveguide coupling efficiency of 75% could be achieved resulting in 304 mW of incident infrared light inside the waveguide. Blue laser light emission of 159 mW at 488 nm has been generated, which equals to a conversion efficiency of 52%. The resulting wall plug efficiency was 7.4%.
Jechow
Andreas
A
University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany. ajechow@uni-potsdam.de
Schedel
Marco
M
Stry
Sandra
S
Sacher
Joachim
J
Menzel
Ralf
R