TY - JOUR

T1 - Ring-shaped random structures inscription in multimode fibers assisted by a spatial light modulator

AU - Munkueva, Zhibzema E

AU - Dostovalov, Alexandr V

AU - Kuznetsov, Alexey G

AU - Kokhanovskiy, Alexey Y.

AU - Revyakin, Alexandr

AU - Kharenko, Denis S

AU - Babin, Sergey A

N1 - The work was supported by the Russian Science Foundation (21-72-30024).

PY - 2024

Y1 - 2024

N2 - We present the fs laser inscription of ring-shaped random structures using spatial light modulator (SLM) in multimode GRIN fiber. The use of SLM allows one to modulate the phase of the fs radiation incident on it and to write various structures with complex geometries inside the static fiber core. We optimized the fs laser inscription parameters: pulse energy, SLM frame rate, overall length and distances along the fiber of the structures to enhance Rayleigh backscattering level at minimal insertion losses. In particular, scattering structures with random distances along the fiber were written using the Line-by-Line method in single mode fiber at the optimal inscription parameters (pulse energy of 3 μJ, SLM frame rate of 5 Hz, the overall of 2 mm and random distances along the fiber in the range of 5 μm). Further, we created the ring-shaped random structures in 100/140 μm GRIN multimode fiber with enhanced Rayleigh backscattering level by +66 dB/mm relative to the intrinsic fiber level. Owing to the variation of random distances along the fiber and ring’s diameters of structures in range of 0.5 μm and 20 μm, respectively, allows one to obtain a broadband reflection spectrum within 88 nm with a reflection coefficient of 0.01%. The low threshold generation with ring-shaped output beam of the Raman fiber laser with random distributed feedback based on the SLM-inscribed random structures in the multimode fiber is demonstrated for the first time.

AB - We present the fs laser inscription of ring-shaped random structures using spatial light modulator (SLM) in multimode GRIN fiber. The use of SLM allows one to modulate the phase of the fs radiation incident on it and to write various structures with complex geometries inside the static fiber core. We optimized the fs laser inscription parameters: pulse energy, SLM frame rate, overall length and distances along the fiber of the structures to enhance Rayleigh backscattering level at minimal insertion losses. In particular, scattering structures with random distances along the fiber were written using the Line-by-Line method in single mode fiber at the optimal inscription parameters (pulse energy of 3 μJ, SLM frame rate of 5 Hz, the overall of 2 mm and random distances along the fiber in the range of 5 μm). Further, we created the ring-shaped random structures in 100/140 μm GRIN multimode fiber with enhanced Rayleigh backscattering level by +66 dB/mm relative to the intrinsic fiber level. Owing to the variation of random distances along the fiber and ring’s diameters of structures in range of 0.5 μm and 20 μm, respectively, allows one to obtain a broadband reflection spectrum within 88 nm with a reflection coefficient of 0.01%. The low threshold generation with ring-shaped output beam of the Raman fiber laser with random distributed feedback based on the SLM-inscribed random structures in the multimode fiber is demonstrated for the first time.

KW - fs laser inscription

KW - raman fiber laser

KW - random structures

KW - rayleigh backscattering

KW - spatial light modulator

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85212192470&origin=inward&txGid=d9a88f7b74b5a72417b65e61a26a0b01

UR - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/13234/3036259/Ring-shaped-random-structures-inscription-in-multimode-fibers-assisted-by/10.1117/12.3036259.full

UR - https://www.mendeley.com/catalogue/1cbdc554-4c10-3b6c-ab67-262c386f65a9/

U2 - 10.1117/12.3036259

DO - 10.1117/12.3036259

M3 - Conference article

VL - 13234

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

M1 - 132340C

T2 - Advanced Laser Processing and Manufacturing VIII 2024

Y2 - 12 October 2024 through 14 October 2024

ER -