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A true single-step process suitable for fabrication of micro-periodic structure in polymer films by two- photon initiated photopolymerization and laser ablation is presented.By the right choice of the irradiation energy,the irradiated zone is modified or ablated in the 1.44-μm-thick film.The mechanism of grating generation and the potential application of the gratings in integrated optics are discussed. 相似文献
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NdvCa4GdO(BO3)3(简称NdvGdCOB)是一种新型自倍频晶体[1]。利用该晶体实现1060.0nm的自倍频绿光输出,因内外均已有报道[2]。我们利用Datachrom5000型染料激光器泵浦该晶体成功地实现了1331.0nm基频光和665.5nm自倍频红光的输出。NdvGdCOB属单斜双轴晶体,具有明显的偏振吸收特性。生长该晶体所用原料为Ca4Nd0.08Gd0.92O(BO3)3。晶体样品尺寸为3mm×3mm×8mm,通光方向为x(x轴与晶体的c轴的夹角为12°,z轴与a轴的夹… 相似文献
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为获得人眼安全的激光,在一个由激光二极管(LD)阵列侧泵、声光调Q的Nd∶YAG激光器谐振腔中放置一非临界相位匹配的KTP晶体,形成了一个内腔式光学参量振荡器,实现了准连续的1.57 μm激光振荡.通过对单谐振光学参量振荡器阈值公式进行讨论,采用了平凹腔的结构和尽可能短的光学参量振荡器腔长,有效地降低了光学参量振荡器的泵浦阈值.测量了不同声光重复率和不同透射率输出镜下光学参量振荡器输出的各项特性参量.分析了声光重复率和输出镜的透过率对光学参量振荡器的泵浦阈值和输出脉冲波形的影响,并对实验中出现的饱和现象作了解释.当泵浦电流14.5A,声光重复率10 kHz,光学参量振荡器输出镜透过率15%时,在保持单脉冲输出的情况下,获得了1.57 μm激光的最高平均功率输出值1.748 W. 相似文献
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The static laser performance of a-growth Nd:GdVO4 crystal (a-cut, 4×4×25 (mm)) at 1.34μm pumped by flash-lamp is investigated with different transmissions of output couplers. With the output coupler transmission of T = 30%, the static output energy of 148 mJ is obtained when the pump energy is 35.2 J, and the corresponding electric-optical conversion efficiency is 0.42%. The Q-switched output of lasers with the output wavelength ranging from 1.3 to 1.6μm can be realized by using Co2 :LaMgAl11O19 (Co:LMA) as saturable absorber. A flash-lamp-pumped, passively Q-switched Nd:GdVO4 laser with Co:LMA as saturable absorber is demonstrated in plano-concave laser cavity. With the cavity length of 16.3 cm and pump energy of 19.8 J, the single-pulse output energy, pulse width, and peak power are obtained to be 4 mJ, 80 ns, and 5×104 W, respectively. 相似文献