【摘要】：波長(zhǎng)為1.4μm的激光因其在射入眼睛時(shí),房水和晶狀體能夠吸收較大成分,因而到達(dá)視網(wǎng)膜的輻射激光較少,所以對(duì)人的眼睛具有安全特性。本文主要介紹了基于新晶體Nd:LGGG作為增益介質(zhì),石墨烯作為可飽和吸收體的被動(dòng)調(diào)Q人眼安全激光器及其應(yīng)用的狀況,并研究了1.4μm人眼安全激光器的輸出特性。相對(duì)于主動(dòng)調(diào)Q人眼安全激光器而言,被動(dòng)調(diào)Q人眼安全激光器具有結(jié)構(gòu)簡(jiǎn)單、重量較輕、可靠性好等優(yōu)點(diǎn)。1.本文全面地介紹了固態(tài)激光器的發(fā)展過(guò)程,對(duì)調(diào)Q的原理與分類進(jìn)行了介紹,并完成了對(duì)1.4μm人眼安全激光器的理論設(shè)計(jì)和機(jī)械設(shè)計(jì)。2.簡(jiǎn)略說(shuō)明了Nd:LGGG晶體的結(jié)構(gòu),以及晶體的生長(zhǎng)方法和熱學(xué)性質(zhì)、光譜性質(zhì)、吸收特性。Nd:LGGG晶體最強(qiáng)吸收峰位于805納米附近,最大半峰寬度為8.6 nm,因此Nd:LGGG晶體非常有利于做增益介質(zhì),且不需要苛刻的控溫。3.系統(tǒng)介紹了石墨烯對(duì)光的非線性吸收和可飽和吸收機(jī)理,以及石墨烯被動(dòng)調(diào)Q的激光特性。調(diào)Q脈沖寬度小于石墨烯的飽和弛豫時(shí)間,因此石墨烯屬于飽和較快的可飽和吸收體。4.采用石墨烯做可飽和吸收體,首次研究了石墨烯被動(dòng)調(diào)Q的Nd:LGGG激光器,獲得1.4μm人眼安全激光輸出。在注入泵浦光功率14.3 W時(shí),獲得平均功率為255 m W、脈沖寬度為490 ns的1.4μm調(diào)Q激光輸出,激光最大單脈沖能量為3.2mJ,脈沖峰值功率6.53 W。5.主要?jiǎng)?chuàng)新點(diǎn):首次以Nd:LGGG作為激光增益介質(zhì),石墨烯為可飽和吸收體,實(shí)現(xiàn)了波長(zhǎng)為1.4μm的激光脈沖,獲得的激光脈沖的寬度為490納秒。
[Abstract]:The wavelength 1.4 渭 m laser is safe for human eyes because the aqueous humor and lens can absorb larger components when it is injected into the eye, so there is less radiation to the retina. This paper mainly introduces the passive Q-switched human eye safe laser based on the new crystal Nd:LGGG as gain medium and graphene as saturable absorber, and its application, and studies the output characteristics of 1.4 渭 m human eye safe laser. Compared with the active Q-switched human eye safety laser, the passive Q-switched human eye safety laser has the advantages of simple structure, light weight and good reliability. In this paper, the development process of solid-state laser is introduced, the principle and classification of Q-switching are introduced, and the theoretical design and mechanical design of 1.4 渭 m human eye safe laser are completed. In this paper, the structure of Nd:LGGG crystal, the growth method, thermal properties, spectral properties and absorption characteristics of Nd:LGGG crystal are briefly described. The strongest absorption peak of ND: LGGG crystal is located near 805 nm, and the maximum half peak width is 8.6 nm. Therefore, Nd:LGGG crystal is very advantageous to be used as gain medium. And does not require harsh temperature control. The mechanism of nonlinear absorption and saturable absorption of graphene and the laser characteristics of passively Q-switched graphene are introduced systematically. The width of Q-switched pulse is smaller than the saturation relaxation time of graphene, so graphene belongs to the saturable absorber. 4. Using graphene as saturable absorber, the Nd:LGGG laser with passively Q-switched graphene has been studied for the first time, and the 1.4 渭 m human eye safe laser output has been obtained. A 1.4 渭 m Q-switched laser with an average power of 255 MW and a pulse width of 490 ns was obtained at a power of 14.3 W. The maximum single pulse energy of the laser is 3.2 MJ and the peak power of the pulse is 6.53 W. 5. The main innovation points are as follows: for the first time, Nd:LGGG is used as gain medium and graphene as saturable absorber. The laser pulse with wavelength of 1.4 渭 m is realized, and the width of the laser pulse is 490nanosecond.
【學(xué)位授予單位】：山東師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN248

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