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  • 20257-3
    Furukawa窄線寬可調(diào)諧激光器:相干光通信的核心技術(shù)突破與演進

    引言:光通信時代的光源革命隨著數(shù)據(jù)流量的指數(shù)級增長,數(shù)字相干光通信技術(shù)正從長距離干線傳輸向短距離城域網(wǎng)、數(shù)據(jù)中心互聯(lián)(DCI)等場景滲透。作為相干通信系統(tǒng)的“心臟”,可調(diào)諧激光器需同時滿足波長覆蓋擴展、線寬壓縮、尺寸功耗微型化等多重挑戰(zhàn)。古河電工集團通過半導體集成技術(shù)與外腔結(jié)構(gòu)創(chuàng)新,開發(fā)出系列窄譜線寬集成可調(diào)諧激光器組件(ITLA),為400G/800G及下一代超高速光網(wǎng)絡提供了核心技術(shù)支撐。一、技術(shù)需求與理論基礎:從性能指標到物理本質(zhì)1.1可調(diào)諧激光器的核心性能參數(shù)-波長調(diào)...

  • 20257-2
    百赫茲大能量中短波雙波長光參量振蕩器

    百赫茲大能量中短波雙波長光參量振蕩器1.5μm和3~5μm波段的激光均位于大氣近紅外窗口,對空氣(包括戰(zhàn)場硝煙,尤其是以、白磷為主的煙霧)的穿透性很強,在激光干擾、激光雷達和**方面具有很高的應用價值。非線性晶體KTiOAsO4(KTA)具有高損傷閾值、大非線性系數(shù)等優(yōu)點,因此KTA-OPO在輸出大能量中短波激光方面?zhèn)涫芮嗖A。但較大能量的中短波激光器重復頻率大多低于100Hz,達到100Hz、百毫焦量級的激光輸出報道較少。為了在百赫茲重復頻率下獲得大能量的中短波KTA-OPO...

  • 20257-1
    相干多普勒激光雷達?是一種新興的主動遙感探測儀器!

    大氣湍流是大氣中的一種重要運動形式,由各種尺度的渦旋疊加而形成不規(guī)則運動,堪稱大氣環(huán)境的“攪拌器”。大氣中的湍流運動無時、無處不在,看不見摸不著,卻嚴重影響大氣中動量、熱量、污染物等的交換,又對聲波、光波及其它電磁波的傳播產(chǎn)生影響。大氣邊界層內(nèi)的湍流運動包括了由垂直風切變形成的機械湍流和對流產(chǎn)生的湍流,對氣象和空氣質(zhì)量起著重要作用。解析大氣邊界層湍流特征,有利于深入了解地-氣系統(tǒng)的能量交換、污染物輸送和擴散以及各種氣象要素,為我國大氣污染治理打開一扇“觀察窗”。相干多普勒激光...

  • 20256-30
    激光選區(qū)熔化引發(fā)的組織、性能各向異性

    研究背景激光選區(qū)熔化是近年來快速發(fā)展的一種金屬材料增材制造技術(shù)。由于其逐層重熔和凝固的成形工藝特點,激光選區(qū)熔化制備的合金組織容易呈現(xiàn)明顯的各向異性,主要表現(xiàn)為晶粒、熔池形態(tài)在不同方向存在差異(如圖1)。圖1激光選區(qū)熔化AlSi10Mg合金金相組織和EBSD形貌三維視圖合金組織的各向異性會對其力學性能產(chǎn)生影響。因此,研究掌握組織各向異性對激光選區(qū)熔化AlSi10Mg合金斷裂韌性的影響規(guī)律,有助于該技術(shù)和材料的應用。創(chuàng)新研究中國航發(fā)北京航空材料研究院3D打印研究與工程技術(shù)中心采...

  • 20256-27
    如何搭建“三高”飛秒激光器?

    “三高”(高重頻、高功率、高脈沖質(zhì)量)飛秒激光光源在科學研究和工業(yè)加工方面具有重要的應用價值。但是在其發(fā)展過程中,由于光纖中的脈沖在被直接放大時受到受激拉曼散射、受激布里淵散射等多種非線性效應的影響,峰值功率提升受限。目前,采用啁啾脈沖放大技術(shù)結(jié)合大模場面積的光子晶體光纖或者雙包層光纖,可以有效降低非線性效應,進一步提高脈沖峰值功率,已經(jīng)逐漸成為該類型激光光源所采用的標準方案。在啁啾脈沖放大技術(shù)中,脈沖展寬壓縮是其中極為重要的部分,可采用的主要有“CFBG展寬+CVBG壓縮”...

  • 20256-26
    激光相干合成的奇妙之旅

    對多束激光進行相干合成是實現(xiàn)激光功率提升的同時保持光束質(zhì)量的有效技術(shù)途徑,它的發(fā)展歷程幾乎和激光技術(shù)的發(fā)展同步,已經(jīng)應用于各種類型的激光器。激光相干合成實現(xiàn)的關(guān)鍵就是要讓每一束激光“心往一處想,勁往一處使”,相位、偏振、光束傾斜度等光參量就是每束激光的“心”和它們要用的“勁”。近十年來,科學家們圍繞著光源性能、光束控制等關(guān)鍵領域,讓每一路激光“配合”得越來越協(xié)調(diào),不斷推動著激光相干合成技術(shù)邁上一個又一個新的高峰。相干合成的單元激光相干合成系統(tǒng)的基礎單元是每一個單獨的激光器,若...

  • 20256-26
    紅外相機安裝高度是破解野生動物監(jiān)測的黃金法則

    紅外相機作為野生動物監(jiān)測的核心工具,其安裝高度直接影響拍攝效果與數(shù)據(jù)質(zhì)量。科學選擇安裝高度需平衡動物行為特征、環(huán)境干擾因素及設備性能,以下從三大維度解析最佳實踐。1.動物行為學視角:高度適配目標物種紅外相機的安裝高度應與目標動物的體型及活動習性匹配。針對中小型動物(如野兔、松鼠),建議將相機固定在離地面0.5-0.8米的位置,此高度可捕捉動物全貌并減少植被遮擋。對于大型哺乳動物(如鹿、野豬),1.2-1.5米的安裝高度更合適,既能覆蓋動物肩部至背部的關(guān)鍵特征,又避免因高度過低...

  • 20256-26
    單頻激光器的應用你知道嗎?

    單頻激光器是一款緊湊型一體化設計半導體激光器,具有窄線寬,高輸出功率特點,且波長穩(wěn)定度高;該激光器集成雙級隔離器,可根據(jù)實際需要靈活選擇自由空間輸出或光纖耦合輸出,是冷原子實驗、量子精密測量等應用的理想光源。單頻激光器主要是固體激光器形式,產(chǎn)品主要包括單頻光纖激光器、單頻半導體激光器兩大類。單頻激光器技術(shù)方案主要有短腔法、色散腔法、環(huán)形腔法、濾光片法等。其中,色散腔法一般是采用在激光器諧振腔內(nèi)插入光柵、基于光柵反饋原理來實現(xiàn)激光發(fā)射,又包括分布式反饋(DFB)激光器、分布式布...

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