全固態(tài)人眼安全拉曼激光器
發(fā)布時(shí)間：2018-10-14 08:59
【摘要】：1.5μm波段激光具有較高的人眼損傷閾值,而且處于“大氣窗口”,在激光雷達(dá),激光測(cè)距,大氣遙感及空間光通信方面都有著重要應(yīng)用。利用受激拉曼散射效應(yīng),可以將1.3μm轉(zhuǎn)換為1.5μm。1.3μm在光纖通信、激光顯示、醫(yī)學(xué)等領(lǐng)域都有著廣泛應(yīng)用。Nd:YAP(摻釹鋁酸釔)晶體4F3/2-4I13/2躍遷可輸出波段在1.3μm附近,具有較大的躍遷截面和熱導(dǎo)率,適合側(cè)面泵浦。Nd:YAP晶體是自然雙折射晶體,可輸出為線偏振光,不會(huì)受到熱退偏效應(yīng)的影響。本論文的方案是采用準(zhǔn)連續(xù)(QCW)激光二極管(laser diode,簡(jiǎn)稱LD)側(cè)面泵浦Nd:YAP晶體,BBO晶體電光主動(dòng)調(diào)Q,結(jié)合ABCD激光傳輸矩陣,利用MATLAB軟件數(shù)值模擬了平平腔和平凹腔的輸出特性,選擇合適的腔長(zhǎng)和元件位置,產(chǎn)生1.34μm基頻光。拉曼介質(zhì)采用Ba(NO3)2(硝酸鋇)晶體,利用外腔結(jié)構(gòu)和單通拉曼發(fā)生器結(jié)構(gòu)實(shí)現(xiàn)1.56μm人眼安全激光輸出。本論文還對(duì)Nd:YAP晶體在1μm波段激光的輸出特性進(jìn)行了研究,在此基礎(chǔ)上利用單通拉曼發(fā)生器結(jié)構(gòu)激發(fā)Ba(NO3)2晶體產(chǎn)生了正三階斯托克斯波長(zhǎng)。主要研究?jī)?nèi)容概括如下:(1)采用b軸切割的Nd:YAP晶體作為激光晶體,BBO(偏硼酸鋇)晶體電光主動(dòng)調(diào)Q,分別利用平平腔和平凹腔實(shí)現(xiàn)1.34μm基頻光高效輸出。重頻20Hz時(shí),平平腔和平凹腔分別可獲得單脈沖能量19.2mJ和18.3mJ,在平平腔時(shí)得到最窄脈寬38ns。實(shí)驗(yàn)還研究了Nd:YAP晶體中4F3/2-4I11/2躍遷產(chǎn)生的1080nm的輸出特性,利用平平腔結(jié)構(gòu),重頻20Hz時(shí)可得到1080nm單脈沖能量48.6mJ,脈寬27ns。(2)利用拉曼發(fā)生器結(jié)構(gòu),在基頻光1.08μm和1.34μm分別獲得正三階斯托克斯波長(zhǎng)(1218.50nm 1396.87nm和1637.25nm)和正一階斯托克斯波長(zhǎng)(1562.68nm)輸出。在外腔拉曼激光器實(shí)驗(yàn)中,在基頻光1.34μm單脈沖能量19.2m J時(shí),獲得一階斯托克斯波長(zhǎng)輸出單脈沖能量1.83mJ,中心波長(zhǎng)為1562.68nm,轉(zhuǎn)換效率9.53%,脈寬被壓縮到9ns。
[Abstract]:The 1.5 渭 m band laser has high threshold of human eye damage and is in the "atmospheric window". It has important applications in lidar, laser ranging, atmospheric remote sensing and space optical communication. Using stimulated Raman scattering, 1.3 渭 m can be converted to 1.5 渭 m.1.3 渭 m in optical fiber communication, laser display, medicine and other fields. The 4F3/2-4I13/2 transition band of Nd:YAP crystal can be near 1.3 渭 m. The Nd:YAP crystal is a natural birefringent crystal, which can output linearly polarized light without the effect of thermal depolarization. The scheme of this thesis is to use quasi continuous (QCW) laser diode (laser diode, (LD) side-pumped Nd:YAP crystal, BBO crystal electro-optic active Q-switched, combined with ABCD laser transmission matrix, using MATLAB software to simulate the output characteristics of flat cavity and concave cavity. A 1.34 渭 m fundamental frequency light is generated by selecting the appropriate cavity length and the position of the element. The Ba (NO3) 2 (barium nitrate) crystal is used in the Raman medium, and the external cavity structure and the single pass Raman generator structure are used to realize the 1.56 渭 m human eye safe laser output. The output characteristics of Nd:YAP crystal at 1 渭 m wavelength are also studied in this paper. On the basis of this, the structure of single pass Raman generator is used to excite Ba (NO3) 2 crystal to produce positive third order Stokes wavelength. The main research contents are summarized as follows: (1) the Nd:YAP crystal cut by b axis is used as the laser crystal, BBO (barium metaborate) crystal, the electrooptic QQ is actively switched, and 1.34 渭 m fundamental frequency light output is realized by using flat cavity and concave cavity respectively. The single pulse energy 19.2mJ and 18.3 MJ can be obtained in flat cavity and concave cavity respectively when 20Hz is repeated, and the narrowest pulse width is 38 ns in flat cavity. The output characteristics of 1080nm produced by 4F3/2-4I11/2 transition in Nd:YAP crystal are also studied. Using flat cavity structure, 1080nm monopulse energy 48.6 mJ and pulse width 27ns2 can be obtained when 20Hz is repeated. (2) Raman generator structure is used. The output of positive third order Stokes wavelength (1218.50nm 1396.87nm and 1637.25nm) and positive first order Stokes wavelength (1562.68nm) are obtained at 1.08 渭 m and 1.34 渭 m of fundamental frequency light, respectively. In the experiment of external cavity Raman laser, when the fundamental frequency light is 1.34 渭 m single pulse energy is 19.2m J, the first order Stokes wavelength output single pulse energy is 1.83 MJ, the center wavelength is 1562.68 nm, the conversion efficiency is 9.53 and the pulse width is compressed to 9ns.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248
本文編號(hào)：2269995
[Abstract]:The 1.5 渭 m band laser has high threshold of human eye damage and is in the "atmospheric window". It has important applications in lidar, laser ranging, atmospheric remote sensing and space optical communication. Using stimulated Raman scattering, 1.3 渭 m can be converted to 1.5 渭 m.1.3 渭 m in optical fiber communication, laser display, medicine and other fields. The 4F3/2-4I13/2 transition band of Nd:YAP crystal can be near 1.3 渭 m. The Nd:YAP crystal is a natural birefringent crystal, which can output linearly polarized light without the effect of thermal depolarization. The scheme of this thesis is to use quasi continuous (QCW) laser diode (laser diode, (LD) side-pumped Nd:YAP crystal, BBO crystal electro-optic active Q-switched, combined with ABCD laser transmission matrix, using MATLAB software to simulate the output characteristics of flat cavity and concave cavity. A 1.34 渭 m fundamental frequency light is generated by selecting the appropriate cavity length and the position of the element. The Ba (NO3) 2 (barium nitrate) crystal is used in the Raman medium, and the external cavity structure and the single pass Raman generator structure are used to realize the 1.56 渭 m human eye safe laser output. The output characteristics of Nd:YAP crystal at 1 渭 m wavelength are also studied in this paper. On the basis of this, the structure of single pass Raman generator is used to excite Ba (NO3) 2 crystal to produce positive third order Stokes wavelength. The main research contents are summarized as follows: (1) the Nd:YAP crystal cut by b axis is used as the laser crystal, BBO (barium metaborate) crystal, the electrooptic QQ is actively switched, and 1.34 渭 m fundamental frequency light output is realized by using flat cavity and concave cavity respectively. The single pulse energy 19.2mJ and 18.3 MJ can be obtained in flat cavity and concave cavity respectively when 20Hz is repeated, and the narrowest pulse width is 38 ns in flat cavity. The output characteristics of 1080nm produced by 4F3/2-4I11/2 transition in Nd:YAP crystal are also studied. Using flat cavity structure, 1080nm monopulse energy 48.6 mJ and pulse width 27ns2 can be obtained when 20Hz is repeated. (2) Raman generator structure is used. The output of positive third order Stokes wavelength (1218.50nm 1396.87nm and 1637.25nm) and positive first order Stokes wavelength (1562.68nm) are obtained at 1.08 渭 m and 1.34 渭 m of fundamental frequency light, respectively. In the experiment of external cavity Raman laser, when the fundamental frequency light is 1.34 渭 m single pulse energy is 19.2m J, the first order Stokes wavelength output single pulse energy is 1.83 MJ, the center wavelength is 1562.68 nm, the conversion efficiency is 9.53 and the pulse width is compressed to 9ns.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 朱海永;張戈;黃呈輝;魏勇;黃凌雄;陳靜;陳瑋冬;位民;陳振強(qiáng);;高功率連續(xù)側(cè)面泵浦1341.4 nm Nd:YAP激光器[J];強(qiáng)激光與粒子束;2006年09期
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