Research output: Contribution to journal › Article › peer-review
Actively Mode Locked Raman Fiber Laser with Multimode LD Pumping. / Kuznetsov, Alexey G.; Kablukov, Sergey I.; Timirtdinov, Yuri A. et al.
In: Photonics, Vol. 9, No. 8, 539, 08.2022.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Actively Mode Locked Raman Fiber Laser with Multimode LD Pumping
AU - Kuznetsov, Alexey G.
AU - Kablukov, Sergey I.
AU - Timirtdinov, Yuri A.
AU - Babin, Sergey A.
N1 - Funding Information: The study is supported by Russian Foundation for Basic Research (21-72-30024). Publisher Copyright: © 2022 by the authors.
PY - 2022/8
Y1 - 2022/8
N2 - We present our recent experimental results on the pulsed regimes of Raman conversion of highly multimode laser diode (LD) pump radiation into the 1st and higher order Stokes radiation in multimode graded-index fibers. Three different linear cavities of Raman fiber laser with the modulation of losses (by acousto-optic modulator, AOM) or gain (by LD current) are explored and compared. An LD with wavelength of 976 nm is used for pumping enabling Raman lasing at wavelength of the 1st (1018 nm) and 2nd (1064 nm) Stokes orders. At ~27.2-kHz repetition rate corresponding to the laser cavity round-trip frequency (i.e., in the mode-locking regime), nanosecond pulses have been observed for both Stokes orders having the highest peak power of ~300 W in the scheme with bulk AOM and the shortest duration of 5–7 ns in the scheme with fiber-pigtailed AOM. At the same time, the beam quality of generated pulses is greatly improved as compared to that for pump diode (M2 > 20) reaching the best value (M2 = 2.05) for the 2nd order Stokes beam in the scheme with the gain modulation and demonstrating also the most stable regime.
AB - We present our recent experimental results on the pulsed regimes of Raman conversion of highly multimode laser diode (LD) pump radiation into the 1st and higher order Stokes radiation in multimode graded-index fibers. Three different linear cavities of Raman fiber laser with the modulation of losses (by acousto-optic modulator, AOM) or gain (by LD current) are explored and compared. An LD with wavelength of 976 nm is used for pumping enabling Raman lasing at wavelength of the 1st (1018 nm) and 2nd (1064 nm) Stokes orders. At ~27.2-kHz repetition rate corresponding to the laser cavity round-trip frequency (i.e., in the mode-locking regime), nanosecond pulses have been observed for both Stokes orders having the highest peak power of ~300 W in the scheme with bulk AOM and the shortest duration of 5–7 ns in the scheme with fiber-pigtailed AOM. At the same time, the beam quality of generated pulses is greatly improved as compared to that for pump diode (M2 > 20) reaching the best value (M2 = 2.05) for the 2nd order Stokes beam in the scheme with the gain modulation and demonstrating also the most stable regime.
KW - beam quality
KW - brightness enhancement
KW - diode pumping
KW - fiber laser
KW - graded-index
KW - mode locking
KW - multimode
KW - Raman laser
UR - http://www.scopus.com/inward/record.url?scp=85137980437&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/4cc9d112-cf21-3f36-a4b7-51f421bd5d66/
U2 - 10.3390/photonics9080539
DO - 10.3390/photonics9080539
M3 - Article
AN - SCOPUS:85137980437
VL - 9
JO - Photonics
JF - Photonics
SN - 2304-6732
IS - 8
M1 - 539
ER -
ID: 38016383