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Yb:YAG晶體，即摻鐿的釔鋁石榴石晶體，因其卓越的物理特性在科研領(lǐng)域中扮演著越來越重要的角色。Yb:YAG作為特殊的激光工作物質(zhì)，不僅繼承了YAG基質(zhì)材料的優(yōu)良物理性質(zhì)和穩(wěn)定化學性能，而且因其更高的激光上能級壽命，展現(xiàn)出良好的激光工作性能。在相同的半導體泵浦功率下，Yb:YAG的每單位泵浦功率熱負荷僅為Nd:YAG的三分之一，這使得其在高功率激光操作中具有更優(yōu)良的散熱性能，有效減少了熱效應對激光輸出的影響^[1]。以下是幾個在科研工作中Yb:YAG晶體關(guān)鍵應用場景：

1. 高重頻全固態(tài)飛秒激光器

Yb:YAG晶體因其高熱導率、長上能級壽命和寬發(fā)射帶寬，成為高重頻全固態(tài)飛秒激光放大器的理想增益介質(zhì)。在工業(yè)超快非熱微加工、極紫外光學頻率梳、高通量高次諧波產(chǎn)生、角分辨電子動量譜等領(lǐng)域，Yb:YAG晶體的應用至關(guān)重要^[2]。通過啁啾脈沖放大（CPA）技術(shù)，Yb:YAG晶體（8 毫米長、6 毫米直徑、3 at.% 摻雜、AR膜系）能夠?qū)崿F(xiàn)kHz量級重復頻率、mJ量級能量的飛秒激光輸出，這對于高溫高密等離子體的驅(qū)動和強磁場陣列的自組織放大具有重要意義^[3]。

2. 碟片激光器

碟片激光器以其結(jié)構(gòu)、效率和光束質(zhì)量上的優(yōu)勢，在實現(xiàn)高重復頻率、大脈沖能量及高平均功率的超快激光方面展現(xiàn)出強大的能力。Yb:YAG晶體在碟片激光器中的應用，使得科研人員能夠?qū)崿F(xiàn)高能量、高光束質(zhì)量的激光輸出^[4]。例如，中國科學院長春光學精密機械與物理研究所利用Yb:YAG單碟片再生放大器（215 微米厚、12 毫米直徑、7 at.% 摻雜、AR膜系；同時搭配兩塊尺寸為 10 mm×10 mm×25 mm的BBO晶體實現(xiàn)λ/4的相位調(diào)制量）實現(xiàn)了重復頻率為1 kHz、單脈沖能量為107 mJ的激光輸出，這是國內(nèi)首次達到這一成就^[5]。

圖1. 碟片狀Yb:YAG晶體

*圖片來源Dausinger + Giesen GmbH

3. 輻射平衡激光器（RBL）

在輻射平衡激光器（RBL）的研究中，Yb:YAG晶體被用于實現(xiàn)激光器的自冷卻，從而減少熱退化和提高激光效率^[6]。通過精確控制泵浦光和激光光的波長，Yb:YAG晶體（4 毫米長、5 毫米寬、0.5 毫米長、5 at.% 摻雜、AR膜系）能夠在量子缺陷產(chǎn)生的熱量和非輻射衰減產(chǎn)生的熱量與熒光誘導冷卻之間達到平衡，從而實現(xiàn)高功率連續(xù)波（CW）操作^[7]。

圖2.基于Yb:YAG的RBL研究裝置示意圖^[7]

4. 高穩(wěn)定高光光效率的再生放大器

Yb:YAG晶體也被用于構(gòu)建高穩(wěn)定高光光效率的再生放大器。中國科學院上海光學精密機械研究所的研究人員設(shè)計并搭建了基于Yb:YAG單薄片激光模塊（215 微米厚、9 毫米直徑、7 at.% 摻雜、AR膜系；同時搭配兩塊尺寸為 12 mm×12 mm×20 mm的BBO晶體實現(xiàn)λ/4的相位調(diào)制量）的再生放大系統(tǒng)，實現(xiàn)了平均功率為40.9 W、重復頻率為1 kHz、脈沖寬度為3.4 ns的激光輸出，光光轉(zhuǎn)換效率達到16.1%^[8]。

圖3.基于Yb:YAG的再生放大激光器裝置示意圖^[8]

此外，中國科學大學的技術(shù)團隊也設(shè)計并搭建了基于Yb:YAG薄片激光模塊（100 微米厚、12.7 毫米直徑、7 at.% 摻雜、AR膜系；同時搭配兩塊尺寸為 6 mm×6 mm×20 mm的BBO晶體實現(xiàn)λ/4的相位調(diào)制量）的再生放大系統(tǒng)，實現(xiàn)了重復頻率為50 kHz、輸出功率312 W、脈沖寬度720 ps、最大脈沖能量超過6 mJ的近衍射極限激光輸出^[9]。這一成果標志著在輸出功率和光光效率方面取得了重大突破。

綜上所述，Yb:YAG晶體因其獨特的物理特性，在科研領(lǐng)域的應用日益廣泛，特別是在高功率、高重頻、高光束質(zhì)量的激光系統(tǒng)設(shè)計和實現(xiàn)中發(fā)揮著關(guān)鍵作用。隨著技術(shù)的不斷進步，Yb:YAG晶體有望在未來的科研和工業(yè)應用中扮演更加重要的角色。