Dual-polarization balanced Yb:GAB crystal for an intracavity simultaneous orthogonally polarized multi-wavelength KGW Raman laser

A compact, actively Q-switched intracavity simultaneous orthogonally polarized multi-wavelength KGW Raman laser is realized with a b-cut Yb3+:GdAl3(BO3)(4) (Yb:GAB) crystal for the first time. The gain balanced dual-polarization of the Yb:GAB fundamental laser can be adjusted by varying the angular tilt of the output mirror. Benefitting from the two strong orthogonally polarized Raman lines at 768 and 901 cm(-1) in KGW crystal, two sets of orthogonally polarized dual-wavelength Raman pulse lasers at 1133.1, 1156.6 nm and 1137.8, 1151.9 nm, respectively are achieved by rotating a 90 degrees. Under an absorbed pump power of 6.6 W, the corresponding peak powers are 10.33 and 10.26 kW, respectively. Along with the power considerable fundamental lasers at 1042.8, 1047.5 nm and 1043.4, 1046.9 nm, a total of eight wavelengths lasers are achieved in the above operation. The simple and reliable intracavity coupled orthogonally polarized multi-wavelength Raman laser shows great potential for the generations of broadband visible and THz radiation. (C) 2016 Optical Society of America