窄帶脈沖周期極化光學參量放大技術(shù)研究
發(fā)布時間：2019-04-30 07:25
【摘要】：基于二階非線性光學效應的光學參量下轉(zhuǎn)換技術(shù)是獲得可調(diào)諧變頻相干光輻射的有效途徑。尤其是近些年來周期極化晶體的出現(xiàn),為參量光源提供了又一次飛躍式發(fā)展的契機。然而普通光學參量振蕩器(optical parametric oscillator,OPO)受到泵浦光線寬、參量增益帶寬的影響,往往處于多縱模運轉(zhuǎn)狀態(tài),其輸出參量光線寬難以滿足高分辨率光譜分析等某些應用的需求,因此為了壓縮參量光的光譜,人們發(fā)展了種子注入式OPO。但種子注入OPO往往需要復雜的反饋控制系統(tǒng),這不僅使其成本高昂、而且不利于小型集成化和使用方便。在這樣的背景下,本文理論分析了采用基于周期極化晶體的光學參量放大器(optical parametric amplifier,OPA)來實現(xiàn)窄帶脈沖參量激光輸出的可能性,并通過后續(xù)實驗初步驗證了該方案的可行性。相比于種子注入OPO,雖然該方案對泵浦源性能有較高要求,但整個實驗裝置結(jié)構(gòu)簡單、無需諧振腔和復雜的控制系統(tǒng),同時又能獲得良好的光譜壓縮效果,是窄線寬參量光源發(fā)展的一個新方向。本文開展的主要工作如下所述:一、通過文獻調(diào)研,總結(jié)和分析國內(nèi)外研究現(xiàn)狀,并在歸一化三波混頻耦合振幅方程組的基礎上,開展了窄帶OPA的數(shù)值模擬,通過理論計算驗證了單程參量放大可以獲得有效的窄帶參量光輸出,得到了實驗所需的泵浦光峰值功率、種子光平均功率以及對應晶體長度等信息。為后續(xù)實驗的開展奠定了理論基礎。二、為了開展近紅外窄帶OPA實驗,首先搭建了LBO-Nd:YAG內(nèi)腔倍頻532nm脈沖激光作為泵浦源,然后對光纖耦合輸出的820 nm種子光進行了性能測試,最后實驗驗證了兩級放大、近紅外窄帶OPA的出光,并獲得了280 mW的平均功率和140μJ的脈沖能量,輸出信號光線寬為14.9 pm。同時,通過實驗經(jīng)驗總結(jié)了窄帶脈沖OPA實驗對泵浦源的性能要求。三、在前一部分實驗的基礎上,采用了商業(yè)化的高性能1064 nm微芯激光器作為泵浦源,以及1971 nm單頻摻銩光纖激光器作為種子源,通過單級的參量放大獲得了有效的2μm波段、雙波長窄帶參量光輸出。1971.13 nm信號光脈沖能量達25μJ,線寬小于82.7 pm,2313.62 nm空閑光脈沖能量達17.8μJ,線寬小于102.3pm。結(jié)果表明,該結(jié)構(gòu)是獲得窄帶近、中紅外脈沖激光的可行方案,并具有進一步提升輸出功率的潛力。
[Abstract]:The optical parameter down-conversion technique based on second-order nonlinear optical effect is an effective way to obtain tunable frequency coherent optical radiation. Especially, the appearance of periodic polarized crystals in recent years provides another opportunity for the development of parametric light source. However, ordinary optical parametric oscillator (optical parametric oscillator,OPO) is affected by pump light width and parametric gain bandwidth. It is often in multi-longitudinal mode operation, and its output parametric light width is difficult to meet the needs of some applications, such as high-resolution spectral analysis. Therefore, in order to compress the spectrum of parametric light, seed injection OPO. has been developed. However, the complex feedback control system is often needed for seed injection into OPO, which not only makes it expensive, but also is not conducive to small integration and convenient use. Under this background, the possibility of using optical parametric amplifier (optical parametric amplifier,OPA) based on periodically polarized crystal to achieve narrow-band pulse parametric laser output is theoretically analyzed in this paper. The feasibility of the scheme is verified by the follow-up experiments. Compared with seed injection OPO, although this scheme has higher performance requirements for pump source, the whole experimental device has simple structure, no need of resonant cavity and complex control system, and can obtain good spectral compression effect at the same time. It is a new direction in the development of narrow linewidth parametric light source. The main work of this paper is as follows: 1. Through literature investigation, the research status at home and abroad is summarized and analyzed, and on the basis of normalized three-wave mixing coupled amplitude equations, numerical simulation of narrow-band OPA is carried out. It is verified by theoretical calculation that one-pass parametric amplification can obtain an effective narrow-band parametric optical output. The peak power of pump light, the average power of seed light and the corresponding crystal length are obtained in the experiment. It lays a theoretical foundation for the development of the follow-up experiments. Secondly, in order to carry out the near infrared narrow-band OPA experiment, the LBO-Nd:YAG intracavity frequency-doubled 532nm pulse laser is constructed as the pump source, and then the performance test of the 820 nm seed light output by the fiber coupling is carried out. Finally, the two-stage amplification is verified by the experiment. The output of near infrared narrow band OPA is obtained, and the average power of 280 mW and pulse energy of 140 渭 J are obtained. The light width of the output signal is 14.9 pm.. At the same time, the performance requirements of narrow-band pulse OPA experiment for pump source are summarized through the experimental experience. Thirdly, based on the previous experiments, the commercial high-performance 1064 nm microcore laser and 1971 nm single-frequency thulium-doped fiber laser are used as the pump source and 1971 nm single-frequency thulium-doped fiber laser as seed source, and the effective 2 渭 m band is obtained by single-stage parametric amplification. The pulse energy of 1971.13 nm signal is 25 渭 J, the linewidth less than 82.7 pm,2313.62 nm is 17.8 渭 J, and the linewidth is less than 102.3 pm. The results show that this structure is a feasible way to obtain narrow-band near-mid-infrared pulse laser and has the potential to further improve the output power.
【學位授予單位】：國防科學技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248;TN722
本文編號：2468593
[Abstract]:The optical parameter down-conversion technique based on second-order nonlinear optical effect is an effective way to obtain tunable frequency coherent optical radiation. Especially, the appearance of periodic polarized crystals in recent years provides another opportunity for the development of parametric light source. However, ordinary optical parametric oscillator (optical parametric oscillator,OPO) is affected by pump light width and parametric gain bandwidth. It is often in multi-longitudinal mode operation, and its output parametric light width is difficult to meet the needs of some applications, such as high-resolution spectral analysis. Therefore, in order to compress the spectrum of parametric light, seed injection OPO. has been developed. However, the complex feedback control system is often needed for seed injection into OPO, which not only makes it expensive, but also is not conducive to small integration and convenient use. Under this background, the possibility of using optical parametric amplifier (optical parametric amplifier,OPA) based on periodically polarized crystal to achieve narrow-band pulse parametric laser output is theoretically analyzed in this paper. The feasibility of the scheme is verified by the follow-up experiments. Compared with seed injection OPO, although this scheme has higher performance requirements for pump source, the whole experimental device has simple structure, no need of resonant cavity and complex control system, and can obtain good spectral compression effect at the same time. It is a new direction in the development of narrow linewidth parametric light source. The main work of this paper is as follows: 1. Through literature investigation, the research status at home and abroad is summarized and analyzed, and on the basis of normalized three-wave mixing coupled amplitude equations, numerical simulation of narrow-band OPA is carried out. It is verified by theoretical calculation that one-pass parametric amplification can obtain an effective narrow-band parametric optical output. The peak power of pump light, the average power of seed light and the corresponding crystal length are obtained in the experiment. It lays a theoretical foundation for the development of the follow-up experiments. Secondly, in order to carry out the near infrared narrow-band OPA experiment, the LBO-Nd:YAG intracavity frequency-doubled 532nm pulse laser is constructed as the pump source, and then the performance test of the 820 nm seed light output by the fiber coupling is carried out. Finally, the two-stage amplification is verified by the experiment. The output of near infrared narrow band OPA is obtained, and the average power of 280 mW and pulse energy of 140 渭 J are obtained. The light width of the output signal is 14.9 pm.. At the same time, the performance requirements of narrow-band pulse OPA experiment for pump source are summarized through the experimental experience. Thirdly, based on the previous experiments, the commercial high-performance 1064 nm microcore laser and 1971 nm single-frequency thulium-doped fiber laser are used as the pump source and 1971 nm single-frequency thulium-doped fiber laser as seed source, and the effective 2 渭 m band is obtained by single-stage parametric amplification. The pulse energy of 1971.13 nm signal is 25 渭 J, the linewidth less than 82.7 pm,2313.62 nm is 17.8 渭 J, and the linewidth is less than 102.3 pm. The results show that this structure is a feasible way to obtain narrow-band near-mid-infrared pulse laser and has the potential to further improve the output power.
【學位授予單位】：國防科學技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248;TN722
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