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Features of repetitively-pulsed oscillation of an erbium fiber laser with a saturable absorber Bi2Te3 covered by silicone at various temperatures
Physica Scripta ( IF 2.9 ) Pub Date : 2021-02-06 , DOI: 10.1088/1402-4896/abe067
D P Sudas 1, 2 , E A Savelyev 2 , P I Kuznetsov 2 , K M Golant 2
Affiliation  

The oscillation of erbium doped fiber lasers (EDFL) in the Q-switch mode is investigated. Etched out fiber tapers coated with two types of saturable absorbers (SA) are tested as passive Q-switches. SA of the first type comprises two-component silicone with nano-flakes of a Bi2Te3 single crystal dissolved in it. A thin film of Bi2Te3 synthesized by the Metalorganic Chemical Vapor Deposition (MOCVD) method on the surface of the fiber taper and coated with the same silicone served as SA of the second type. Housed within a refrigerator the fabricated sample of fiber taper with SA was in series plug into the fiber ring of the laser. A maximum is observed in the temperature dependence of the EDFL pulse repetition rate with both types of Q-switches. A decrease in temperature to –4 C (for the first type) and to 9.5 C (for the second one) led to the oscillation wavelength change from 1560 to 1530 nm. Cooling of Q-switches of the first and second types was accompanied by a decrease in the duration of laser pulses by a factor of 2.5 and 3.5, respectively, at a pump power corresponded to the conversion of laser oscillation from CW to repetitively-pulsed mode. At a given laser pump power, a 20% and 40% increment in the pulse repetition rate is observed upon cooling of passive Q-switches based on Bi2Te3 nanopowder-in-polymer and Bi2Te3 thin-film, up to temperatures of –14.8 C and 4.4 C, respectively, as compared to that one at room temperature. A diminution in the temperature of a passive Q-switch made it possible to obtain pulsed laser oscillation in a circuit that did not support the pulsed mode at room temperature.



中文翻译:

具有饱和吸收体Bi 2 Te 3的silicone光纤激光器在不同温度下的重复脉冲振荡特性

研究了掺-光纤激光器(EDFL)在Q开关模式下的振荡。浸涂了两种类型的可饱和吸收器(SA)的蚀刻出的光纤锥作为无源Q开关进行测试。第一类型的SA包括双组分硅酮,其中溶解有Bi 2 Te 3单晶的纳米薄片。Bi 2 Te 3薄膜通过金属有机化学气相沉积(MOCVD)方法在纤维锥度的表面上合成并涂有相同的有机硅作为第二类型的SA。将装有SA的光纤锥度样品装入冰箱中,然后将其串联插入激光器的光纤环中。两种类型的Q开关在EDFL脉冲重复频率的温度相关性方面均观察到最大值。温度降低到–4 C(对于第一类)和9.5 C(对于第二类)导致振荡波长从1560 nm改变到1530 nm。在相应于泵浦功率的激光功率从CW转换为重复脉冲模式的泵浦功率下,第一类型和第二类型Q开关的冷却分别使激光脉冲的持续时间分别减少了2.5和3.5倍。 。在给定的激光泵浦功率下,2 Te 3纳米粉状聚合物和Bi 2 Te 3薄膜,与室温下的温度相比分别高达–14.8 C和4.4C。无源Q开关温度的降低使得在不支持室温下脉冲模式的电路中获得脉冲激光振荡成为可能。

更新日期:2021-02-06
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