TY - JOUR

T1 - Cavity-enhanced frequency doubling of a multimode diode-pumped Raman fiber laser

AU - Evmenova, E A

AU - Kablukov, S I

AU - Dostovalov, A V

AU - Nemov, I N

AU - Babin, S A

N1 - Cavity-enhanced frequency doubling of a multimode diode-pumped Raman fiber laser / E. A. Evmenova, S. I. Kablukov, A. V. Dostovalov [et al.] // Laser Physics Letters. – 2025. – Vol. 22. - No. 12. – P. 125102. – DOI 10.1088/1612-202x/ae2df5. – EDN NRMESS.

PY - 2025/12/29

Y1 - 2025/12/29

N2 - This work presents, to the best of our knowledge, the first demonstration of cavity-enhanced frequency doubling of laser radiation comprising more than 10 5 longitudinal modes in a multimode fiber cavity. The approach relies on passive locking of a Raman laser based on a 1.5 km-long graded-index multimode fiber to an external bow-tie enhancement cavity through weak feedback. This technique enabled the accumulation of the 954 nm fundamental wave in the cavity, resulting in a sixfold increase in the second-harmonic power at 477 nm compared to the single-pass scheme, from 40 mW to 240 mW. The obtained beam quality is rather good. Nevertheless, in the power scaling process the influence of transverse modes in the fundamental laser beam becomes pronounced, leading to distortion of both the beam profile and the emission spectrum of the second harmonic.

AB - This work presents, to the best of our knowledge, the first demonstration of cavity-enhanced frequency doubling of laser radiation comprising more than 10 5 longitudinal modes in a multimode fiber cavity. The approach relies on passive locking of a Raman laser based on a 1.5 km-long graded-index multimode fiber to an external bow-tie enhancement cavity through weak feedback. This technique enabled the accumulation of the 954 nm fundamental wave in the cavity, resulting in a sixfold increase in the second-harmonic power at 477 nm compared to the single-pass scheme, from 40 mW to 240 mW. The obtained beam quality is rather good. Nevertheless, in the power scaling process the influence of transverse modes in the fundamental laser beam becomes pronounced, leading to distortion of both the beam profile and the emission spectrum of the second harmonic.

UR - https://www.scopus.com/pages/publications/105033786297

UR - https://www.elibrary.ru/item.asp?id=88522557

UR - https://www.mendeley.com/catalogue/2a67a74d-a436-3f93-9ce0-a953c94148c5/

U2 - 10.1088/1612-202x/ae2df5

DO - 10.1088/1612-202x/ae2df5

M3 - Article

VL - 22

JO - Laser Physics Letters

JF - Laser Physics Letters

SN - 1612-2011

IS - 12

M1 - 125102

ER -