【摘要】：針對(duì)圓棒激光晶體的實(shí)際工作情況進(jìn)行分析研究,以熱容激光器的運(yùn)行模式為依據(jù),從經(jīng)典熱傳導(dǎo)方程出發(fā),分別建立泵浦階段、冷卻階段的熱傳導(dǎo)模型。然后引入變熱傳導(dǎo)系數(shù)對(duì)方程進(jìn)行求解,分別得到LD單端泵浦和冷卻時(shí)熱容激光器溫度場的表達(dá)式。同時(shí)分析并對(duì)比了不同因素,如光斑半徑、泵浦時(shí)間對(duì)晶體溫度場的影響。計(jì)算結(jié)果表明:使用脈沖激光對(duì)晶體進(jìn)行泵浦時(shí),將Nd∶YAG晶體的熱導(dǎo)率視為常量和變量的情況下,該晶體在泵浦端面獲得的最大溫升分別為164.84℃、195.58℃。此時(shí)激光光斑半徑為800μm,泵浦功率為60W、超高斯階次為3;該激光晶體的尺寸為Ф20 mm×10 mm,摻釹離子為1.0 at%,吸收系數(shù)是0.91 mm~(-1)。計(jì)算分析結(jié)果對(duì)LD泵浦固體熱容激光器諧振腔的設(shè)計(jì)具有借鑒意義。
[Abstract]:In view of the actual working situation of the circular rod laser crystal, based on the operation mode of the heat capacity laser, the heat conduction model of the pump stage and the cooling stage is set up separately from the classical heat conduction equation. Then the equation is solved by introducing the thermal conductivity coefficient, and the LD single end pump and cooling heat capacity laser are obtained respectively. The effect of different factors, such as the radius of the spot and the pump time on the temperature field of the crystal, is analyzed and compared. The results show that the maximum temperature rise of the crystal at the end of the pump is 164.8 when the thermal conductivity of the Nd: YAG crystal is considered as constant and variable when the crystal is pumped by a pulsed laser. At 4, 195.58 C, the laser spot radius is 800 mu m, the pump power is 60W, the super Gauss order is 3, the size of the laser crystal is 20 mm x 10 mm, the nd ion is 1 at% and the absorption coefficient is 0.91 mm~ (-1). The calculation analysis results can be used for reference for the design of the LD pumped solid heat capacity laser resonator.
【作者單位】： 西安建筑科技大學(xué)理學(xué)院;
【基金】：陜西省自然科學(xué)青年基礎(chǔ)研究基金項(xiàng)目(No.2014JQ1008)資助
【分類號(hào)】：TN248

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