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提出并实验研究了一种2μm波段全光纤间隔可调双波长光纤激光器.该激光器采用传统的环形腔设计,以最大输出功率33dBm的1 565nm光纤激光器为泵浦源,4m单模掺铥光纤为增益介质,腔内为嵌入多模干涉滤波器的Sagnac环的复合滤波结构.该复合滤波器可实现间隔可调谐,高边模抑制比的双波长激光信号输出.通过泵浦功率的控制和对复合滤波器中偏振控制器的调节,实现双波长3nm到80nm间隔可调的激光输出,边模抑制比为60dB,线宽为0.2nm,功率稳定度为±1.5dB/h,双峰能量差小于4dB. 相似文献
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采用单纵模Nd:YAG二倍频激光泵浦,研究了CH4气体中的受激喇曼散射.实验发现,当激光的重复频率为2 Hz,1.1 MPa CH4中,泵浦能量为95 mJ时,后向一级斯托克斯(BS1)的量子转化效率可达73%,并且由于激光脉冲的张弛振荡,BS1的脉宽被压窄到1.2 ns,峰值功率达到了泵浦光功率的2.7倍,其光束质量大大优于泵浦光.在同样条件下,而重复频率为10 Hz时,BS1的量子转化效率降低为36%,但对光束质量影响不大,这是因为BS1呈现为与泵浦光波前翻转的复制光波,可以补偿热畸变.研究结果表明,如果设计一个CH4/He混合气体的带封闭循环冷却系统的高性能630 nm喇曼激光器,可能有其实际应用价值. 相似文献
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针对高精度相干激光探测需求,提出了一种基于环形腔结构的双波长单频输出掺饵光纤激光器。该激光器使用未泵浦的掺饵光纤作为可饱和吸收体,结合标准具结构的光纤法布里-珀罗滤波器和光纤布拉格光栅,实现1 570 nm和1 548 nm附近的双波长单频激光输出,其中心波长分别为1 569.97 nm和1 548.06 nm,光信噪比分别达到58 dB和55 dB。通过在100 min内对输出激光光谱和功率的连续数据采集,得到输出功率波动分别为0.01 dB和0.02 dB,且光谱仪上始终未见输出激光光谱中心波长变化,表明输出激光具有良好的工作稳定性。采用延时非零自外差法测量了输出激光的线宽,测得1 570 nm处激光线宽约为230.2 Hz,1 548 nm处线宽约为223.6 Hz。 相似文献
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研制了高功率连续单频Nd:YVO4激光器。在考虑激光晶体因吸收泵浦光而产生的热透镜效应的基础上,设计了六镜环行激光谐振腔,采用两个光纤耦合输出的高功率激光二极管双端端面泵浦结构,在总泵浦功率为32.3W的情况下,得到10.4W的单频1.064μm红外输出,斜效率为43.7%,长期功率稳走性优于1%(4h),激光器自由运转时的频率漂移小于150MHz(1min)。 相似文献
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自放大结构分布反馈光纤激光器输出特性 总被引:1,自引:1,他引:0
在光敏性掺铒光纤上制作了45mm长非对称相移结构光纤光栅,构成前后向功率输出比大于100∶1的分布反馈光纤激光器.利用一定长度的掺铒光纤吸收有源相移光栅后的剩余泵浦光,实现了对前向输出激光信号的放大,并采用OptiSystem软件模拟了掺铒光纤长度与增益的关系.为了保持输出激光的窄线宽和低噪音特性,利用布喇格波长与激光相同的光纤光栅和光纤环行器构成光窄带滤波器,对放大后激光信号的ASE噪音进行滤除.研究表明:所设计的激光器结构充分利用了泵浦光,在300mW的(980nm)泵浦功率下获得了功率为32.5mW,线宽为11.5kHz,相对强度噪音为-87dB/Hz的激光输出. 相似文献
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报道了一种由温度控制,共振频率可调谐的窄带F-P干涉滤波器.该F-P干涉滤波器的自由光谱区为13.6 GHz,透射带宽(透射峰半高处线宽)约为541 MHz.通过控制其温度变化,改变F-P干涉滤波器两端面间距,可使共振透过F-P干涉滤波器的激光频率连续调谐.实验测得当激光频率与F-P干涉滤波器共振时,透射率可达82%,同时与共振频率相差2 GHz~10 GHz的激光可被该F-P干涉滤波器反射掉,反射率达99.3%-99.7%.当控制温度波动小于4-0.005℃时,透射过F-P干涉滤波器的激光功率波动小于2.5%. 相似文献
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窄谱光纤激光器在光束合成等领域有着广泛的应用,然而模式不稳定效应的出现严重限制着窄谱光纤激光器的功率提升。提出并验证了采用新型981 nm稳波长泵浦方案,能够应用于窄谱激光放大并提升模式不稳定效应阈值,通过采用单端后向泵浦结构,将单模窄谱光纤放大器功率提至4 kW以上。实验中采用白噪声相位调制展宽单频激光作为窄谱种子,主放大级分别采用稳波长976 nm和981 nm两种泵浦源单端后向泵浦。在采用976 nm泵浦源泵浦时,窄谱激光最高放大至3.4 kW,出现典型的模式不稳定效应特征,功率提升受到限制。在采用981 nm泵浦源泵浦时,窄谱激光最高放大至4.05 kW,且并未出现模式不稳定效应,输出光束质量M2因子为1.3,进一步功率提升仅受限于泵浦功率。通过优化激光器设计、结合双向泵浦结构,有望实现更高功率的窄谱光纤激光输出。 相似文献
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The temporal characteristics of two different narrow-band optical filters at 532 nm are reported. Both filters operate on the 4P(1/2) - 8S(1/2) atomic transition of potassium vapor, where the 4P(1/2) state is excited by a 770-nm, 10-ns laser pulse. The filters operate on the principle of circular birefringence induced by either the Faraday effect or two-photon transition, which is confirmed by experiments. The characteristic decay times of the filters are 5 and 0.015 mus, which is significant for the design of optical gating and signal processing with matched filters for ocean lidar. 相似文献
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We report an excited-state Faraday anomalous-dispersion optical filter operating on the rubidium 5P(3/2)-5D(5/2) transition (775.9 nm in vacuum) without the use of a pump laser. An electrodeless discharge vapor lamp is employed to replace the Rb vapor cell in a traditional Faraday anomalous-dispersion optical filter system. Atoms can be excited by power rather than a complex frequency-locked pump laser. A proof-of-concept experimental demonstration with a maximum transmission of 1.9% and a filter bandwidth of 650 MHz is presented. 相似文献
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Watt-level,green-pumped optical parametric oscillator based on periodically poled potassium titanyl phosphate with high extraction efficiency 下载免费PDF全文
Hang-Hang Yu 《中国物理 B》2022,31(12):124203-124203
We report a compact, efficient optical parametric oscillator (OPO) based on a periodically poled potassium titanyl phosphate (PPKTP) crystal pumped by a 532 nm laser, which generated 1.51 W of average power at the signal wavelength of 709 nm with the pulse duration of ~ 1.0 ns. The extraction efficiency was up to 59%. To the best of our knowledge, this is the first report on Watt-level green-pumped PPKTP-based singly resonant oscillator OPO (SRO-OPO). The precise build-up time of OPO was determined to be 1.6 ns benefitting from the characteristic of twin-peak pulse profile of pump beam. The spectrum width of the idler was also measured to be 4.2 nm with the central wavelength of 2134 nm at 0.2 nm spectral resolution of optical spectrum analyzer. In addition, the beam quality of M2 < 1.9 of generated signal exhibits a good consistency with M2 < 1.5 for the pump source. 相似文献
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Received August 11, 2003 We report continuous-wave and actively Q-switched laser performance achieved with Nd:LuVO4 crystal for the 4F(3/2) --> 4I(1/2) transition (corresponding wavelength of 1065.8 nm) under high-power diode pumping. Continuous-wave output power of 12.55 W is obtained with an optical conversion efficiency of 50.2%. In actively Q-switched operation the average output power reaches 5.42 W at a pulse repetition frequency of 40 kHz with 18 W of pump power incident upon the crystal, yielding an optical conversion efficiency of 30.1%. The pulse energy and peak power reach 138 microJ and 16.2 kW, respectively, at a pulse repetition frequency of 25 kHz under a pump power of 14.2 W; the pulse duration is 8.5 ns. 相似文献
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Sub-Doppler bandwidth atomic optical filter 总被引:1,自引:0,他引:1
We demonstrate what is to our knowledge the first atomic optical filter that uses velocity selection to achieve a passband width that is less than the Doppler width of the filtering transition. A narrow-linewidth pump laser is used to induce circular birefringence in a narrow velocity class of atoms in a dense potassium vapor for 694-nm light resonant with the 4P(3/2)-6S(1/2) transition. The filter displays a single 170-MHz passband at a peak transmittance of 9.5%. The bandwidth is an order of magnitude lower than that of previously demonstrated atomic optical filters. 相似文献
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The operation of an ultra-narrow bandwidth optical filter based on the 5P3/2 → 5D3/2 excited-state transition in rubidium vapor is reported. The 5D3/2 state is excited by a circularly polarized pump beam at 780 nm from a diode laser. The filter displays a single 398-MHz bandwidth at a peak transmission of 9.0%, which is narrower than the Doppler bandwidth. The dependence of peak transmission on the pump intensity and cell temperature is also given. 相似文献
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Xu P Li K Zhao G Zhu SN Du Y Ji SH Zhu YY Ming NB Luo L Li KF Cheah KW 《Optics letters》2004,29(1):95-97
We present what is to our knowledge a new approach to generating tunable blue light by cascaded nonlinear frequency conversion in a single LiTaO3 crystal. Simultaneous quasi-phase matching of an optical parametric generation process and a sum-frequency mixing process is achieved by means of structuring the crystal with a quasi-periodic optical superlattice. The spectral (wavelength tuning and bandwidth) and power characteristics of the blue-light generation are studied with a fixed-wavelength 532-nm picosecond laser and a wavelength-tunable nanosecond optical parametric oscillator (OPO) as the pump sources. By tuning the OPO wavelength, we could tune the blue output over approximately 20 nm. Temperature tuning of the blue output at a fixed pump wavelength of 532 nm was limited to approximately 1.5 nm. A maximum blue power of 15 microW was generated at a pump power of 0.5 mW, corresponding to an efficiency of 3%. 相似文献
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ZHANG Yundong CHANG Zhiwen BI Yong JIA Xiaoling MA Zuguang WANG Qi 《Chinese Journal of Lasers》1999,8(5):407-411
1Intr0duCtionItisarathertroubesomproblemtoreceiveweakandnarrowband0Pticalsignal0nthebackgudn0se.Becausethenose0fbackgrOUnbringsaboUtgreatdisturbance,itiscriticaltoenhanethereceivingtwnoiserati0anddecreasethepeakvaluepowrreqchemntfOrlaserbotterinthesystem.ThinterferenceoPticalfilterisnocometenforthiswor.Typicallyat0ndcresonancefi1ter(ARF)[']isusedtoobtainultranarrowbandoPticalfi1tering,achievingpaSSbandofaPProkimate1y1Gth.An0terdevicetheFaradaydispersdrioPticalfilt..["'1,hasbeenusedt0at… 相似文献
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A potassium Faraday dispersion optical filter (FDOF) is theoretically studied for the 4P3/2←4S1/2 transition including hyperfine effects. The optimum filter operating condition is also obtained. The single peak bandwidth of the optical filter is about 0.86 GHz and equivalent noise band width is 2.4 GHz. The transmission is approximately 94.1% percent under the optimum condition. 相似文献