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引言

LIDAR是Light Detection And Ranging的縮寫，它通常是通過向目標(biāo)照射一束脈沖激光來測了目標(biāo)的距離等參數(shù)。LIDAR（光探測和測距）技術(shù)在無人駕駛、遙感測繪、國防安全等領(lǐng)域發(fā)揮著重要作用。測距儀作為LIDAR系統(tǒng)的關(guān)鍵部件，要求激光器具備高效、穩(wěn)定的輸出特性。Er,Yb:glass + Co:spinel 鍵合晶體因其優(yōu)異的光學(xué)性能，成為LIDAR和測距儀中人眼安全激光源的理想選擇。

1. Er,Yb:glass 增益介質(zhì)和Co:spinel被動調(diào)Q特性

Er,Yb:glass（Er3?/Yb3?共摻磷酸鹽或硅酸鹽玻璃）是一種高效的1.5 μm人眼安全激光增益介質(zhì)，具有以下優(yōu)勢：

高效能量轉(zhuǎn)換：Yb3?在940 nm具有高吸收截面，并通過高效能量轉(zhuǎn)移（>90%）激發(fā)Er3?，最終實現(xiàn)1535 nm激光輸出。
高光-光轉(zhuǎn)換效率：可達(dá)~35%，優(yōu)于傳統(tǒng)Er:glass。
優(yōu)異的熱穩(wěn)定性：上能級壽命長（8–10 ms），適用于高能量脈沖輸出。高熱導(dǎo)率（1.2–1.5 W/m·K）降低熱應(yīng)力，提高光束質(zhì)量。
寬光譜增益：增益帶寬達(dá)60 nm（1500–1560 nm），支持可調(diào)諧輸出，如1535 nm（LIDAR）和1550 nm（光通信）。
高抗損傷性：損傷閾值達(dá)15 J/cm2，耐受高功率泵浦，適用于惡劣環(huán)境。

Co:spinel 作為可飽和吸收體（SA），用于被動調(diào)Q運作，能夠產(chǎn)生高峰值功率的短脈沖輸出，使LIDAR系統(tǒng)能夠?qū)崿F(xiàn)遠(yuǎn)距離、高分辨率測量。

圖2. Er,Yb:glass + Co:spinel 鍵合晶體, 鍵合晶體, Crylink

2. LIDAR系統(tǒng)中的關(guān)鍵應(yīng)用

Er,Yb:glass + Co:spinel鍵合晶體在LIDAR和測距儀中的主要應(yīng)用包括：

無人駕駛激光雷達(dá)：1535 nm激光器提供高峰值功率，提升探測范圍和目標(biāo)識別能力，同時減少環(huán)境光干擾。
國防與軍事測距：人眼安全波長確保士兵操作安全，適用于戰(zhàn)場目標(biāo)定位、彈道測量等遠(yuǎn)距離測距任務(wù)。
地理測繪與環(huán)境監(jiān)測：1535 nm激光能穿透大氣中的煙霧和粉塵，提高LIDAR測繪精度，適用于城市建模、森林資源調(diào)查等領(lǐng)域。
大氣監(jiān)測與科學(xué)研究：該波長的高穿透性適用于氣象探測，如測量水汽分布、大氣污染物濃度等。

3. 1535 nm激光在人眼安全測距中的優(yōu)勢

LIDAR系統(tǒng)通常工作在近紅外波段，而1535 nm波長被認(rèn)為是人眼安全波長，符合IEC 60825標(biāo)準(zhǔn)。其安全性主要體現(xiàn)在：

生物安全性：1535 nm激光主要被角膜與晶狀體吸收，顯著降低視網(wǎng)膜損傷風(fēng)險（相較于1064 nm等短波長激光）。
大氣傳輸特性：在霧、雨等復(fù)雜環(huán)境中具有較高的透射率，且與熔融石英光纖（傳輸損耗<0.2 dB/km）兼容。
探測器兼容性：與InGaAs光電二極管（室溫響應(yīng)范圍900–1700 nm）高效匹配，提升系統(tǒng)信噪比。

4. 鍍膜技術(shù)優(yōu)化LIDAR性能

為了提高LIDAR系統(tǒng)的效率和穩(wěn)定性，Er,Yb:glass + Co:spinel 鍵合晶體通常采用以下鍍膜技術(shù)：

增透膜（AR@1535nm）：減少激光在晶體界面的損耗，提高透射效率。
高反射膜（HR@1535nm + AR@940nm）：增強腔內(nèi)光循環(huán)，同時優(yōu)化泵浦光吸收。
部分反射膜（PR@1535nm）：優(yōu)化輸出耦合，提高系統(tǒng)的能量利用率。

通過精確控制薄膜層的厚度和折射率，鍍膜技術(shù)能夠有效降低光損耗，提高反射或透射性能。高質(zhì)量的增透膜減少腔內(nèi)光的反射損失，提高泵浦光利用率。高反射膜確保腔內(nèi)光能量有效循環(huán)，增強激光器的輸出穩(wěn)定性，而部分反射膜則可優(yōu)化激光輸出功率，提高LIDAR系統(tǒng)的探測能力。

5. 未來展望

隨著LIDAR技術(shù)的發(fā)展，對激光器的性能要求不斷提升。未來，Er,Yb:glass + Co:spinel 鍵合晶體的優(yōu)化方向可能包括：

提升泵浦效率：采用更高效的Yb3?能量傳遞機制，提高整體轉(zhuǎn)換效率。
優(yōu)化熱管理：開發(fā)更先進(jìn)的散熱結(jié)構(gòu)，減少熱透鏡效應(yīng)對光束質(zhì)量的影響。
精確鍍膜控制：通過納米級薄膜技術(shù)，進(jìn)一步降低光損耗，提高激光輸出穩(wěn)定性。

6. 結(jié)論

Er,Yb:glass + Co:spinel 鍵合晶體憑借其優(yōu)異的光學(xué)特性，在LIDAR和測距儀中發(fā)揮著至關(guān)重要的作用。其在1535 nm人眼安全波長下的高效激光輸出、高峰值功率脈沖特性以及穩(wěn)定的光學(xué)性能，使其成為先進(jìn)測距和遙感系統(tǒng)的理想選擇。此外，該材料在惡劣環(huán)境下的可靠性使其適用于軍事、航空航天和精密測量等多個領(lǐng)域。

未來，隨著鍍膜技術(shù)、熱管理和材料工程的進(jìn)一步優(yōu)化，Er,Yb:glass + Co:spinel 鍵合晶體的應(yīng)用范圍將進(jìn)一步擴大。新型材料的研究和制造工藝的改進(jìn)將推動更高效、更穩(wěn)定的激光器開發(fā)，滿足不斷增長的高精度測距與探測需求。

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