TY - JOUR

T1 - High-brightness all-fiber Raman lasers directly pumped by multimode laser diodes

AU - Babin, S. A.

PY - 2019/3/13

Y1 - 2019/3/13

N2 - High-brightness fiber laser sources usually utilize active rare-earth-doped fibers cladding-pumped by multimode laser diodes (LDs), but they operate in limited wavelength ranges. Singlemode-passive-fiber based Raman lasers are able to operate at almost any wavelength being pumped by high-power fiber lasers. One of the 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 the 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 sources 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 9xx nm. GRIN fibers with core diameters 62.5, 85 and are compared. Further scaling capabilities and potential applications of such sources are discussed.

AB - High-brightness fiber laser sources usually utilize active rare-earth-doped fibers cladding-pumped by multimode laser diodes (LDs), but they operate in limited wavelength ranges. Singlemode-passive-fiber based Raman lasers are able to operate at almost any wavelength being pumped by high-power fiber lasers. One of the 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 the 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 sources 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 9xx nm. GRIN fibers with core diameters 62.5, 85 and are compared. Further scaling capabilities and potential applications of such sources are discussed.

KW - beam cleaning

KW - fiber laser

KW - high brightness

KW - laser diode pumping

KW - Raman laser

KW - BEAM

KW - CW

KW - EFFICIENCY

UR - http://www.scopus.com/inward/record.url?scp=85062901521&partnerID=8YFLogxK

U2 - 10.1017/hpl.2018.76

DO - 10.1017/hpl.2018.76

M3 - Article

AN - SCOPUS:85062901521

VL - 7

JO - High Power Laser Science and Engineering

JF - High Power Laser Science and Engineering

SN - 2095-4719

M1 - 15

ER -