本文選題：連續(xù)調(diào)諧　切入點(diǎn)：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(diǎn),因此在高靈敏度的干涉儀、高分辨率激光光譜、引力波探測(cè)、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(dú)特的優(yōu)點(diǎn),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(shí)驗(yàn)室和其它科研領(lǐng)域有著廣泛的應(yīng)用前景,為了推動(dòng)我們實(shí)驗(yàn)室基礎(chǔ)研究和應(yīng)用研究的發(fā)展,加快我們國(guó)家自主創(chuàng)新的步伐,我們分別對(duì)雙折射濾光片組的設(shè)計(jì)、腔內(nèi)標(biāo)準(zhǔn)具的鎖定、鎖定標(biāo)準(zhǔn)具需要的低噪聲高壓放大器、以及對(duì)作為泵浦源的高功率綠光激光器的控制系統(tǒng)設(shè)計(jì)等進(jìn)行了一系列研究工作： 1、設(shè)計(jì)了一個(gè)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(guò)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(shí),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(shí)的功率穩(wěn)定性優(yōu)于±0.64%,在此基礎(chǔ)上,通過(guò)改變標(biāo)準(zhǔn)具的工作溫度,實(shí)現(xiàn)了激光器的頻率調(diào)諧,在溫度改變約14℃時(shí),激光器基頻光的頻率調(diào)諧范圍達(dá)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(xì)吸收峰的光頻標(biāo)系統(tǒng)中,提供優(yōu)質(zhì)的激光光源。2、設(shè)計(jì)制做了LOCK-IN、標(biāo)準(zhǔn)具探測(cè)器以及振鏡電機(jī)控制信號(hào)等關(guān)鍵電子設(shè)備,實(shí)現(xiàn)了標(biāo)準(zhǔn)具與激光器腔內(nèi)振蕩光的鎖定,為進(jìn)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(jìn)行連續(xù)調(diào)諧實(shí)驗(yàn),發(fā)現(xiàn)了TGG晶體和半波片對(duì)連續(xù)調(diào)諧的影響,設(shè)計(jì)了布氏角入射TGG晶體及自然旋光補(bǔ)償片的光學(xué)單向器。并總結(jié)出設(shè)計(jì)自然旋光補(bǔ)償片時(shí)如何考慮s光反射的問(wèn)題,以避免出現(xiàn)過(guò)補(bǔ)償,為以后的實(shí)驗(yàn)設(shè)計(jì)工作積累了經(jīng)驗(yàn)。 在采用布氏角入射TGG+自然旋光補(bǔ)償片結(jié)構(gòu)的光學(xué)單向器進(jìn)行的連續(xù)調(diào)諧實(shí)驗(yàn)中,最終實(shí)現(xiàn)了連續(xù)調(diào)諧20GHz的實(shí)驗(yàn)結(jié)果。 由于鈦寶石激光器有較寬的波長(zhǎng)調(diào)諧范圍,其中780nm光波恰好對(duì)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(shí),利用波長(zhǎng)為780nnm激光作為泵浦光,通過(guò)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(jì)完成了由單片機(jī)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(dá)到了預(yù)期的效果。在此工作中設(shè)計(jì)完成了硬件PCB板的設(shè)計(jì),并通過(guò)軟件編程實(shí)現(xiàn)了預(yù)定的目標(biāo)。系統(tǒng)開(kāi)關(guān)機(jī)過(guò)程中實(shí)現(xiàn)了LBO倍頻晶體溫度自動(dòng)均勻變化,在操作邏輯順序上由程序控制,在運(yùn)行過(guò)程中發(fā)現(xiàn)異�？勺詣�(dòng)進(jìn)入關(guān)機(jī)程序,避免了許多人為誤操作帶來(lái)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(guò)程不會(huì)出現(xiàn)過(guò)流損壞LD的情況；從而操作更方便,運(yùn)行更安全。 4、設(shè)計(jì)完成了低噪聲高壓放大器的工作。通過(guò)設(shè)計(jì)電平搬移電路,將運(yùn)算放大器輸出電壓搬移300多伏后,傳遞到末級(jí)放大作用的高壓N溝道MOS管的柵源之間,使低電壓的運(yùn)算放大器與高壓晶體管可以配合工作。 經(jīng)過(guò)兩年多本所各實(shí)驗(yàn)室的使用,效果良好,滿足了精密實(shí)驗(yàn)中低噪聲放大的需求。在此基礎(chǔ)上向國(guó)家知識(shí)產(chǎn)權(quán)局審請(qǐng)國(guó)家專(zhuān)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(biāo)準(zhǔn)具溫度變化實(shí)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(bǔ)償片避免了標(biāo)準(zhǔn)具效應(yīng)對(duì)激光器連續(xù)調(diào)諧的影響。提出自然旋光補(bǔ)償片過(guò)補(bǔ)償及產(chǎn)生的原因,使補(bǔ)償更加有效。 C.實(shí)現(xiàn)標(biāo)準(zhǔn)具與激光器頻率的鎖定,為研究連續(xù)調(diào)諧過(guò)程中的問(wèn)題創(chuàng)造了條件。 D.利用單片機(jī)程序控制激光器泵浦源,使整個(gè)系統(tǒng)操作更加簡(jiǎn)便,運(yùn)行更加可靠。 E.設(shè)計(jì)了電平搬移電路,實(shí)現(xiàn)在高壓放大器中運(yùn)算放大器輸出信號(hào)下移300多伏驅(qū)動(dòng)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(jí)別】：博士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TN248

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