本文選題：半導(dǎo)體激光器 + 電流驅(qū)動(dòng)　； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：半導(dǎo)體激光器具有單色性、相干性好,準(zhǔn)直度高,強(qiáng)度大,能耗小,效率高等優(yōu)點(diǎn),令其在軍事,醫(yī)療,通信等領(lǐng)域發(fā)揮著無可替代的作用。然而它對(duì)工作電流和溫度極為敏感,電流的起伏不僅會(huì)引發(fā)激光器的噪聲,還會(huì)造成光波長(zhǎng)的改變,同時(shí)工作時(shí)產(chǎn)生的熱量還會(huì)增大其閾值電流,降低其壽命,此外浪涌、靜電等諸多干擾還會(huì)擊穿激光器的PN結(jié)。為了確保激光器能夠穩(wěn)定可靠的工作,研制出一種體積小,高穩(wěn)定度,無浪涌電流,電流連續(xù)可調(diào),溫度可控的激光驅(qū)動(dòng)器具有比較重大的現(xiàn)實(shí)意義。本論文首先分析了半導(dǎo)體激光器的工作原理、特性和損壞機(jī)理,在此基礎(chǔ)上制定了本論文工作目標(biāo),確定了系統(tǒng)方案設(shè)計(jì)。然后根據(jù)方案,設(shè)計(jì)了具有恒流驅(qū)動(dòng)和溫控的半導(dǎo)體激光器驅(qū)動(dòng)系統(tǒng)。驅(qū)動(dòng)系統(tǒng)中,根據(jù)按鍵輸入的目標(biāo)值轉(zhuǎn)為單片機(jī)DAC電壓輸出,經(jīng)過恒流源的電壓-電流轉(zhuǎn)換從而驅(qū)動(dòng)激光器,內(nèi)部由PID算法進(jìn)行電流調(diào)整;溫控系統(tǒng)中,通過控制驅(qū)動(dòng)芯片穩(wěn)定溫度,最終保證溫度恒定;此外還設(shè)計(jì)了各種保護(hù)電路。文章最后對(duì)系統(tǒng)性能進(jìn)行了測(cè)試和分析。對(duì)PID進(jìn)行了仿真,其電路符合對(duì)溫控模塊的基本需求。對(duì)電流精度以及電流、溫度和長(zhǎng)期穩(wěn)定性做了大量的實(shí)驗(yàn)測(cè)試,其精度和穩(wěn)定度較高,滿足系統(tǒng)預(yù)期目標(biāo)。接著選用DFB激光器對(duì)系統(tǒng)進(jìn)行實(shí)際驗(yàn)證,其光源輸出穩(wěn)定。因此可最終得出,此系統(tǒng)性能良好,基本達(dá)到設(shè)計(jì)目標(biāo),可以滿足激光驅(qū)動(dòng)的基本功能。
[Abstract]:Semiconductor lasers have the advantages of monochromatic, good coherence, high collimation, high intensity, low energy consumption and high efficiency, which make them play an irreplaceable role in military, medical, communication and other fields.However, it is extremely sensitive to the working current and temperature. The fluctuation of the current not only causes the noise of the laser, but also changes the wavelength of the light. At the same time, the heat generated during the operation also increases its threshold current, reduces its life, and the surge.Static electricity and many other interference will also break down the PN junction of the laser.In order to ensure that the laser can work stably and reliably, it is of great practical significance to develop a laser driver with small volume, high stability, no surge current, continuously adjustable current and controllable temperature.In this paper, the working principle, characteristics and damage mechanism of semiconductor laser are analyzed firstly, and then the working goal of this thesis is established, and the system scheme design is determined.Then, a semiconductor laser drive system with constant current drive and temperature control is designed according to the scheme.In the driving system, according to the target value input by the keystroke, the output of the DAC voltage is converted into the output of the single-chip microcomputer. The laser is driven by the voltage-current conversion of the constant current source, and the internal current is adjusted by the PID algorithm.By controlling the driving chip to stabilize the temperature, the temperature is kept constant, and various protection circuits are designed.Finally, the performance of the system is tested and analyzed.The simulation of PID is carried out, and its circuit meets the basic requirement of temperature control module.A large number of experiments have been carried out on the accuracy of current, current, temperature and long-term stability. The accuracy and stability of the experiment are high and meet the expected goal of the system.Then the DFB laser is used to verify the system, and the output of the light source is stable.Therefore, it can be concluded that the system has good performance, basically achieves the design goal, and can satisfy the basic function of laser drive.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248

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本文編號(hào)：1770611