Efficient multi-wavelength Raman conversion of Nd:YAG laser at 532 nm

Multi-order Stokes is generated in H2 pumped by a pulsed Nd:YAG laser at 532 nm. Maximum energy conversion efficiencies as high as 66%， 60% and 19% are attained for the first，second and third Stokes respectively. Under 0.44 MPa H2, significant multi-wavelength outputs can be obtained simultaneously with quantum distribution of 19% at 1 579 nm, 30% at 954 nm, 33% at 683 nm, 14% at 532 nm, 3.7% at 436 nm, and 1.4% at 368 nm. High-pressure H2 is found to be the best for highly efficient first Stokes conversion, while low-pressure H2 is proved suitable for higher order Stokes and anti-Stokes generation.