The 1.5th-generation “three-high/one-excellent” YDF specialty laser fiber

Table 1. 1.5G-YDF specialty laser fiber parameters
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Table 1. 1.5G-YDF specialty laser fiber parameters
1.5G-YDF laser fiber laser power/kW beam quality M²
LMA-14/250-YDF 2～3 ～1.05
LMA-20/400-YDF 3～4 ～1.10
LMA-25/400-YDF 4～6 ～1.20
PLMA-20/400-YDF 2～3 ～1.20
PLMA-25/400-YDF 3～5 ～1.30

Table 2. 1.5G LMA-14/250-YDF specialty laser fiber parameters

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Table 2. 1.5G LMA-14/250-YDF specialty laser fiber parameters

parameter	unit	specification
peak cladding absorption @915 nm	dB/m	0.50±0.15
peak cladding absorption @976 nm	dB/m	1.50±0.25
cladding attenuation@1 095 nm	dB/km	≤10
core attenuation@1 200 nm	dB/km	≤10
core attenuation@1 300 nm	dB/km	≤15
core NA	—	0.070±0.005
cladding NA（5%）	—	≥0.46
core/clad offset	μm	≤1.0
core diameter	μm	14.3±0.5
clad diameter (flat-to-flat)	μm	250±5.0
max. output power	kW	≥2.0
slope efficiency@976 nm	%	≥78
beam quality M²	—	～1.05

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Juan Yu, Li Ni, Kun Peng, Heng Xiang, Xiaoxiao Leng, Aoxiang Lin. The 1.5th-generation “three-high/one-excellent” YDF specialty laser fiber[J]. High Power Laser and Particle Beams, 2024, 36(10): 101001

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