本文選題：連續(xù)調(diào)諧　切入點：鈦寶石激光器　出處：《山西大學(xué)》2013年博士論文

【摘要】：全固態(tài)連續(xù)單頻可調(diào)諧激光器,具有輸出光譜范圍寬、輸出功率高、使用方便、窄線寬及全固態(tài)等優(yōu)點,因此在高靈敏度的干涉儀、高分辨率激光光譜、引力波探測、量子通訊、原子冷卻及其它基礎(chǔ)物理研究等領(lǐng)域獲得了廣泛應(yīng)用。 作為可調(diào)諧激光器中的代表——全固態(tài)連續(xù)調(diào)諧單頻鈦寶石激光器由于它頻譜范圍寬,線寬窄,相位噪聲低,功率高,等獨特的優(yōu)點,已成為量子通訊、量子信息處理、激光光譜等領(lǐng)域的重要光源。 鑒于全固態(tài)連續(xù)單頻可調(diào)諧鈦寶石激光器在我們實驗室和其它科研領(lǐng)域有著廣泛的應(yīng)用前景,為了推動我們實驗室基礎(chǔ)研究和應(yīng)用研究的發(fā)展,加快我們國家自主創(chuàng)新的步伐,我們分別對雙折射濾光片組的設(shè)計、腔內(nèi)標準具的鎖定、鎖定標準具需要的低噪聲高壓放大器、以及對作為泵浦源的高功率綠光激光器的控制系統(tǒng)設(shè)計等進行了一系列研究工作： 1、設(shè)計了一個可調(diào)諧的高功率低噪聲單頻綠光激光器。激光器采用LD端面泵浦技術(shù),諧振腔采用四鏡8字環(huán)形諧振腔結(jié)構(gòu),通過在諧振腔內(nèi)插入楔形的復(fù)合Nd:YVO4增益晶體,倍頻晶體LBO,光學(xué)單向器,在LD泵浦功率為47W時,獲得了輸出功率為10.7W的連續(xù)單頻綠光激光輸出,3小時的功率穩(wěn)定性優(yōu)于±0.64%,在此基礎(chǔ)上,通過改變標準具的工作溫度,實現(xiàn)了激光器的頻率調(diào)諧,在溫度改變約14℃時,激光器基頻光的頻率調(diào)諧范圍達到了12GHz,相應(yīng)倍頻光的調(diào)諧范圍為24GHz,由于調(diào)諧范圍覆蓋了碘分子多條吸收線,因此它可在基于碘分子超精細吸收峰的光頻標系統(tǒng)中,提供優(yōu)質(zhì)的激光光源。2、設(shè)計制做了LOCK-IN、標準具探測器以及振鏡電機控制信號等關(guān)鍵電子設(shè)備,實現(xiàn)了標準具與激光器腔內(nèi)振蕩光的鎖定,為進行激光器連續(xù)調(diào)諧工作研究創(chuàng)造了條件。使用垂直入射TGG+半波片的光學(xué)單向器,進行連續(xù)調(diào)諧實驗,發(fā)現(xiàn)了TGG晶體和半波片對連續(xù)調(diào)諧的影響,設(shè)計了布氏角入射TGG晶體及自然旋光補償片的光學(xué)單向器。并總結(jié)出設(shè)計自然旋光補償片時如何考慮s光反射的問題,以避免出現(xiàn)過補償,為以后的實驗設(shè)計工作積累了經(jīng)驗。 在采用布氏角入射TGG+自然旋光補償片結(jié)構(gòu)的光學(xué)單向器進行的連續(xù)調(diào)諧實驗中,最終實現(xiàn)了連續(xù)調(diào)諧20GHz的實驗結(jié)果。 由于鈦寶石激光器有較寬的波長調(diào)諧范圍,其中780nm光波恰好對應(yīng)于銣原子躍遷線F3/2一F1/2,因此可以有效俘獲銣原子并將之冷卻。同時,利用波長為780nnm激光作為泵浦光,通過OPO技術(shù)還可獲得1560nm糾纏源,可用于量子保密通訊研究。因此可以為銣原子的研究以及量子光學(xué)通訊提供優(yōu)質(zhì)光源。 3、設(shè)計完成了由單片機控制的LD泵浦源控制系統(tǒng),與我所生產(chǎn)的10W單綠光單頻激光器配套使用,達到了預(yù)期的效果。在此工作中設(shè)計完成了硬件PCB板的設(shè)計,并通過軟件編程實現(xiàn)了預(yù)定的目標。系統(tǒng)開關(guān)機過程中實現(xiàn)了LBO倍頻晶體溫度自動均勻變化,在操作邏輯順序上由程序控制,在運行過程中發(fā)現(xiàn)異�？勺詣舆M入關(guān)機程序,避免了許多人為誤操作帶來的安全隱患；在電流設(shè)置方面,由于程序設(shè)定了上限電流,操作過程不會出現(xiàn)過流損壞LD的情況；從而操作更方便,運行更安全。 4、設(shè)計完成了低噪聲高壓放大器的工作。通過設(shè)計電平搬移電路,將運算放大器輸出電壓搬移300多伏后,傳遞到末級放大作用的高壓N溝道MOS管的柵源之間,使低電壓的運算放大器與高壓晶體管可以配合工作。 經(jīng)過兩年多本所各實驗室的使用,效果良好,滿足了精密實驗中低噪聲放大的需求。在此基礎(chǔ)上向國家知識產(chǎn)權(quán)局審請國家專利,并于2013年1月23日獲得授權(quán)。 創(chuàng)新性的工作： A.利用薄標準具溫度變化實現(xiàn)大范圍激光器頻率調(diào)諧。 B.利用布氏角入射TGG+自然旋光補償片避免了標準具效應(yīng)對激光器連續(xù)調(diào)諧的影響。提出自然旋光補償片過補償及產(chǎn)生的原因,使補償更加有效。 C.實現(xiàn)標準具與激光器頻率的鎖定,為研究連續(xù)調(diào)諧過程中的問題創(chuàng)造了條件。 D.利用單片機程序控制激光器泵浦源,使整個系統(tǒng)操作更加簡便,運行更加可靠。 E.設(shè)計了電平搬移電路,實現(xiàn)在高壓放大器中運算放大器輸出信號下移300多伏驅(qū)動高壓MOS晶體管。
[Abstract]:The full - solid continuous single - frequency tunable laser has the advantages of wide output spectrum range , high output power , convenient use , narrow line width and solid state and the like , and is widely applied in the fields of high - sensitivity interferometer , high - resolution laser spectrum , gravitational wave detection , quantum communication , atom cooling and other basic physical research .

As a representative _ all - solid - state continuous tuned single - frequency Ti - sapphire laser in tunable laser , it has become an important light source in quantum communication , quantum information processing and laser spectrum because of its wide spectral range , narrow line width , low phase noise , high power , and so on .

In view of the wide application prospect of the full - solid continuous single - frequency tunable Ti - sapphire laser in our laboratory and other scientific research fields , in order to promote the development of our laboratory basic research and application research , to accelerate the pace of our national independent innovation , we have carried out a series of research on the design of birefringent filter banks , the locking of etalon in the cavity , the low noise high - voltage amplifier required by the locking standard , and the design of the control system of the high - power green laser as pumping source .

1 . A tunable high - power low noise single - frequency green laser is designed . The laser adopts LD end - end pump technology . The resonant cavity adopts a four - mirror 8 - word ring resonator structure . The frequency tuning range of the laser is better than 鹵 0.64 % by changing the operating temperature of the etalon .

In the continuous tuning experiment using the optical one - way device with a Bragg angle incident TGG + natural optical compensation plate structure , the experimental results of 20 GHz tuning are finally realized .

Because the Ti - sapphire laser has a wide wavelength tuning range , the 780 nm light wave exactly corresponds to the rubidium atom transition line F3 / 2 - F1 / 2 , so that the rubidium atom can be effectively trapped and cooled . At the same time , a 1560nm entangled source can be obtained by using a laser with a wavelength of 780 nnm as the pumping light , and can be used for quantum secret communication research . Therefore , the research on rubidium atoms and quantum optical communication can be provided for providing a high - quality light source .

3 . The LD pump source control system controlled by the single chip microcomputer is designed and finished . The design of the hardware PCB board is achieved . The design of the hardware PCB board is designed and realized by software programming . In the process of the system switching machine , the automatic uniform change of the temperature of the frequency doubling crystal is realized . In the operation logic sequence , the automatic uniform change of the frequency doubling crystal temperature can be realized , and the shutdown program can be automatically entered in the operation process , so that the potential safety hazard caused by misoperation is avoided ;
In the aspect of the current setting , since the program sets the upper limit current , the operation does not occur in the case of overcurrent damage LD ;
so that the operation is more convenient and the operation is safer .

4 . A low - noise high - voltage amplifier is designed and completed . By designing the level shift circuit , the output voltage of the operational amplifier is shifted by more than 300 volts , and then transferred to the gate source of the high - voltage N - channel MOS tube at the final stage amplifying effect , so that the low - voltage operational amplifier and the high - voltage transistor can work together .

After more than two years of use of various laboratories , the effect is good enough to meet the requirement of low noise amplification in the precision experiment . On this basis , the State patent is requested to the State Intellectual Property Office , and the authorization is granted on January 23 , 2013 .

Innovative work :

A . A wide range of laser frequency tuning is achieved with a thin etalon temperature variation .

B . The influence of etalon effect on the continuous tuning of the laser is avoided by using the Bragg angle incident TGG + natural optical compensation slice , and the reason of overcompensation and generation of the natural optical rotation compensation sheet is proposed , so that the compensation is more effective .

C . Achieving the locking of etalon and laser frequency creates conditions for studying the problems in the continuous tuning process .

and D . the laser pumping source is controlled by using a single - chip microcomputer program , so that the operation of the whole system is simpler , and the operation is more reliable .

E . A level shift circuit is designed to realize the operation of the amplifier output signal in the high voltage amplifier by more than 300 V to drive the high - voltage MOS transistor .

【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TN248

【參考文獻】

相關(guān)期刊論文 前7條

1 王軍營,鄭權(quán),薛慶華,檀慧明;利用雙折射濾光片技術(shù)獲得瓦級單頻綠光輸出[J];光子學(xué)報;2005年03期

2 王軍民，梁曉燕，李瑞寧;一種可用于可調(diào)諧環(huán)行Ti：Al_2O_3激光器的寬帶單向器[J];激光與紅外;1994年01期

3 郝二娟;李特;檀慧明;錢龍生;;LD泵浦的全固態(tài)激光器的單頻實現(xiàn)方法[J];激光雜志;2006年02期

4 孫曉泉，謝建平，張運生，耿玉珍，王峻梅;鈦寶石環(huán)形激光器的實驗研究[J];中國激光;1995年01期

5 吳路生，，韋麗，周東方，趙梅榮，鄔承就;雙向泵浦的高功率高效率鈦寶石激光器[J];中國激光;1995年03期

6 趙永華，劉玉璞，張影華;寬調(diào)諧固體激光器的BF設(shè)計[J];中國激光;1995年09期

7 王文哲;;基于單片機的全固態(tài)激光器電控系統(tǒng)[J];量子光學(xué)學(xué)報;2013年02期

相關(guān)博士學(xué)位論文 前1條

1 盧華東;連續(xù)單頻可調(diào)諧鈦寶石激光器及其強度噪聲特性的研究[D];山西大學(xué);2011年

相關(guān)碩士學(xué)位論文 前1條

1 孫燕;全固態(tài)連續(xù)單頻鈦寶石激光器[D];山西大學(xué);2008年

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