【摘要】：亞納秒高峰值功率的DPL全固態(tài)激光器在激光加工,激光雷達(dá),醫(yī)療,非線(xiàn)性光學(xué)和科研領(lǐng)域得到了廣泛的應(yīng)用。特別是在加工領(lǐng)域,具有熱作用范圍小,精度高,速度快等特點(diǎn)。本論文針對(duì)亞納秒的1064nm脈沖激光光源,對(duì)被動(dòng)調(diào)Q獲得亞納秒1064nm激光的輸出進(jìn)行理論與實(shí)驗(yàn)的研究。首先介紹了Cr:YAG晶體的能級(jí)結(jié)構(gòu)、光譜特性,根據(jù)Cr:YAG的飽和吸收特性,模擬研究了在不同初始透過(guò)率下,Cr:YAG透過(guò)率隨光功率密度的變化規(guī)律。通過(guò)求解被動(dòng)調(diào)Q速率方程,得出了單脈沖能量,峰值功率,脈沖寬度的表達(dá)式,從脈沖寬度的表達(dá)式出發(fā),模擬研究了輸出鏡反射率、飽和吸收體Cr:Y:AG初始透過(guò)率、腔長(zhǎng)對(duì)脈沖寬度的變化規(guī)律,以及單脈沖能量,峰值功率隨輸出鏡反射率的變化規(guī)律。實(shí)驗(yàn)研究了諧振腔長(zhǎng)度、輸出鏡透過(guò)率、飽和吸收體Cr:YAG初始透過(guò)率對(duì)脈沖寬度的影響,輸出鏡透過(guò)率對(duì)峰值功率和單脈沖能量的影響,飽和吸收體Cr:YAG初始透過(guò)率對(duì)峰值功率和單脈沖能量的影響,以及重復(fù)頻率對(duì)脈沖寬度和單脈沖能量的影響。完成了端面泵浦Nd:YAG/Cr:YAG鍵合晶體被動(dòng)調(diào)Q激光器原理樣機(jī)設(shè)計(jì)與研制,在泵浦峰值功率為29W,泵浦脈寬為370μs,重復(fù)頻率為500Hz的情況下,獲得了脈寬0.99ns,單脈沖能量450μJ,線(xiàn)寬0.0624nm的激光輸出,光-光轉(zhuǎn)化效率為4.2%。
[Abstract]:Sub-nanosecond high peak power DPL all-solid-state lasers have been widely used in laser processing, lidar, medical, nonlinear optics and scientific research. Especially in the field of processing, it has the characteristics of small range of thermal action, high accuracy and high speed. In this paper, the output of subnanosecond 1064nm laser is studied theoretically and experimentally for the subnanosecond 1064nm pulse laser source. Firstly, the energy level structure and spectral characteristics of Cr:YAG crystal are introduced. According to the saturation absorption characteristics of Cr:YAG, the variation of Cr:YAG transmittance with optical power density at different initial transmittance is simulated and studied. By solving the passively Q-switched rate equation, the expressions of single pulse energy, peak power and pulse width are obtained. Based on the expression of pulse width, the reflectivity of output mirror and the initial transmittance of saturated absorber Cr:Y:AG are simulated. The variation of the cavity length to the pulse width and the variation of the single pulse energy and the peak power with the reflectivity of the output mirror. The effects of the cavity length, the transmittance of the output mirror, the initial transmittance of the saturated absorber Cr:YAG on the pulse width, and the influence of the transmission rate of the output mirror on the peak power and monopulse energy are experimentally studied. The effect of initial transmittance of saturated absorber Cr:YAG on peak power and single pulse energy, and the effect of repetition rate on pulse width and single pulse energy. The principle prototype of end-pumped Nd:YAG/Cr:YAG bonded crystal passively Q-switched laser is designed and developed. When the pump peak power is 29W, the pump pulse width is 370 渭 s, the repetition rate is 500Hz, the pulse width is 0.99ns. The laser output of single pulse energy 450 渭 J and linewidth 0.0624nm is 4. 2%.
【學(xué)位授予單位】：長(zhǎng)春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN248

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