基于液晶芯光栅阵列反馈的光纤随机激光器

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关键词：随机光纤激光器；液晶芯随机光栅阵列；光诱导相分离中图分类号：TN248.1 文献标识码：ADOI：10.37188/CJL.20250121 CSTR：32170.14.CJL.20250121

Abstract：Random fiber lasers have significant application potential inareas such as imaging，sensing，and medical diagnostics.This paper proposes a random fiber laser based on feedback from aliquid crystal core random grating array，by utilizing a random grating array mask and light-induced phase separation technology，a liquid crystal core grating arraywith randomly distributed gratings was realized withinahollow-core opticalfiber，which is integrated into theopticalpath toproviderandom fedbackforthelaser.Thethresholdoftherandom fiberlaser atroom temperature is 49.3mW.As the pump intensity gradualy increases，the numberoflasing modes increases，with the lasing modes dynamicallydistributed over therange of1529-1532nmand exhibiting a relatively smallrangeoflasing intensityvariations.The temperaturevariationof therandomgrating aray willaffect the lasing characteristics of therandomfiberlaser.As the temperature rises，thefeedback strength of thegrating array decreases，resulting inan increased lasing threshold and adecreasedlasing intensity.Additionally，the probabilityoflasing modesaround1530.9nmand1531.3nmsignificantlyincreases.Thiskindofmulti-moderandomfiberlaserbasedonliquidcrystalcorerandomgrating arrayfeedback has greatapplicationpotentialinthefieldsof sensing，communication and imaging.

KeyWords：random fiberlaser;liquid crystal core fiber grating array；light-induced phase separatic

1引言

随机激光器的反馈机制与传统激光器不同，无需谐振腔结构而是依靠光在无序介质中的多重散射提供反馈。（剩余14627字）