The majority of D2 SRS studies were conducted using the lasers of short wavelength, such as 355 nm [12] and 266 nm [13]. Studies of D2 SRS pumped by lasers of 1064 nm are sparse.
Hanna et al.reported experimental and theoretical studies of D2 SRS pumped
by the picosecond 1064 nm laser [11]. Hooper et al. presented the results of studying SRS in D2 pumped with a nanosecond 1064 nm laser [14]. They used a seed and amplifying scheme to improve the Raman conversion efficiency. Although a narrow linewidth
(0.003 cm1) laser was applied, the threshold for the first Stokes
(S1) was still higher than 10 MW, and the maximum conversion efficiency of S1 was approximately 50%. In this work, the SRS of D2 pumped by a 0.7 cm1-linewidth nanosecond 1064 nm laser is reported, and a multi-pass configuration was used to obtain a very low threshold.