High-brightness All-fiber Raman Lasers Directly Pumped by Multimode Laser Diodes
High-brightness fiber laser sources are usually utilize active rare-earth-doped fibers cladding-pumped by multimode laser diodes (LDs), but they operate in limited wavelength range. Singlemode-passive-fiber based Raman lasers are able to operate at almost any wavelength being pumped by high-power fiber lasers. One of interesting possibilities is to directly pump graded-index (GRIN) multimode passive fibers by available high-power multimode LDs at 915-940 nm thus achieving high-power Raman lasing in wavelength range of 950-1000 nm, which is problematic for rare-earth-doped fiber lasers. Here we review the latest results on the development of all-fiber high-brightness LD-pumped source based on GRIN fiber with in-fiber Bragg gratings (FBGs). The mode-selection properties of FBGs inscribed by fs pulses supported by the Raman clean-up effect result in efficient conversion of multimode pump into a high-quality output beam at 9хх nm. GRIN fibers with core diameters 62.5, 85 and 100 µm are compared. Further scaling capabilities and potential applications of such sources are discussed.
作者单位：Institute of Automation and Electrometry SB RAS
Babin Sergey. High-brightness All-fiber Raman Lasers Directly Pumped by Multimode Laser Diodes[J].High Power Laser Science and Engineering,,():.