准分子激光对水松纸打标的研究

用适当能量密度的３０８纳米波长紫外激光对水松纸作用，获得了清晰可见的图案标记。分析了该打标过程的作用机理，通过实验得出了打标的能量阈值条件及优化条件。     

准分子激光对铜版纸打标的研究

用308nm波长的准分子激光对铜版印刷纸打标，获得了精细可见的标记．分析了该打标过程的作用机理，通过实验得出了打标的能量密度问值，优选了打标的条件．     

准分子激光对钛搪瓷打标的研究

用308nm准分子激光对钛搪瓷进行了打标实验,在适当的功率密度下,获得了精细可见的标记.该能量密度远低于红外激光对陶瓷类材料打标的能量密度,也比基于汽化刻蚀原理用紫外激光对陶瓷材料打标的能量密度低得多.通过实验得出了打标的阈值和优选参数,对准分子激光作用变色的机理进行了分析.     

准分子激光对钛搪瓷打标的研究

用308nm准分子激光对钛搪瓷进行了打标实验,在适当的功率密度下,获得了精细可见的标记.该能量密度远低于红外激光对陶瓷类材料打标的能量密度,也比基于汽化刻蚀原理用紫外激光对陶瓷材料打标的能量密度低得多.通过实验得出了打标的阈值和优选参数,对准分子激光作用变色的机理进行了分析.     

激光打标的应用趋势

打标作为激光技术一项最古老的应用具有广泛的工业应用领域.这些工业包括航空、半导体、汽车、消费品、食品包装、医疗产品及防伪鉴别等.除了这些成熟的应用以外,近来由于某些激光技术的进一步发展,激光打标取得了重要的新突破.这些新的突破使激光打标能够在越来越多的应用中取代其它打标技术.本文将介绍发生这一变化的原因和过程.     

准分子激光在打标中的应用

报导准分子激光在打标中的应用。从实验上得到了３０８ｎｍ激光对一些有机高分子材料和金属材料打标记的阈值能量，并观察到某些材料表面在激光作用下发生的变化。最后介绍一台自己研制的微机控制的准分子激光打标机。     

适合打印各种标记的低功率CO2激光器

众所周知，密封式CO2激光器早已能在塑料、纸张和其他有机材料上打印标记。最近，这种激光器又开辟了两个新的应用领域，即在金属和玻璃上打印标记。一旦CO2激光器在这两方面的应用占优势，则其身价倍增。CO2激光器在这些领域中的应用主要归功于加工处理技术的改进和新型激光器的出现，这使CO2激光器能更好地满足这些材料加工的需要。     

氦-氖气体激光器的高温玻璃封接技术

1.影响气体激光器寿命的主要因素之一的是反射镜片与激光器管口的真空密封问题.至今国内外已采用光胶、环氧树脂粘合剂胶合封接、低融点玻璃封接和柯伐金属玻璃封接等技术,但都不十分理想.最理想的封接方法是全玻璃直接封接,即把反射镜片的玻璃和激光器管口的玻璃直接融熔封接在一起,但至今未见报道.我们将真空管工艺中高频感应电阻损耗加热方法运用于激光器的制管封接,获得了理想的玻璃直接密封方法.用此方法于1982年制作了一小批氦-氖激光器,效果极好,至今仍在正常工作,激光器的寿命已达5万小时.2.高温玻璃直接密封技术的主要难点是:     

重复率脉冲掺钕磷酸盐激光玻璃系列

研制了三种具有高受激发射截面、热光稳定的磷酸盐激光玻璃.给出主要光谱参数和激光性能.该玻璃已获应用.     

LD侧面抽运的铒玻璃激光器

铒玻璃激光器可以直接输出1.54μm人眼安全激光,主要应用在激光测距。报道了LD侧面抽运的Er+3,Yb+3共掺磷酸盐玻璃激光器的运转。实现了自由振荡输出60mJ;在0.5Hz重复频率下,稳定输出50m J/脉冲,波长1.54μm。实验表明,抽运的对称性和均匀性是设计铒玻璃激光器的关键。     

Erbium-doped ion-exchanged waveguide lasers in BK-7 glass

Ion-exchange in glass is a simple, flexible technique to realize optical fiber-compatible planar waveguide devices. Recently, neodymium-doped waveguide lasers operating at 1060 and 1300 nm have been demonstrated in this technology. Lasers operating at 1540 nm are desirable for telecommunication applications and the authors report for the first time ion-exchanged waveguide lasers in erbium-doped glass emitting at this wavelength. Lasers in BK-7 glass doped with 0.5 wt.% Er ₂O₃ and pumped at 980 nm exhibited launched pump power thresholds of 150 mW and slope efficiencies of 0.55%. The waveguides operated in a single transverse mode at the lasing wavelength     

Spectral and polarization hole burning in neodymium glass lasers

Gain saturation in short-pulse glass laser amplifiers is treated including both spectral and polarization hole burning. Site-to-site differences in energy levels, transition probabilities, and orientations of the lasing ion in glass result in a distribution of stimulated emission cross sections and selective deexcitation of subsets of ions by a laser beam. These spectroscopic inhomogeneities are described by simple models whose parameters include the average emission cross section, the ratio of homogeneous-to-inhomogeneous linewidths, and the polarized cross section ratio. Performance of amplifiers based on the model media is calculated. Values for parameters to model an actual laser glass are obtained from standard fluorescence measurements and from resonant fluorescence line-narrowing (FLN) experiments. The predicted gain of a Nd-doped laser glass (ED-2) is compared to published amplifier measurements. The good agreement obtained demonstrates that data from FLN experiments provide sufficient information to model the performance of a glass amplifier in the large-signal gain regime. The results can also be used to guide the selection of glasses for increased energy extraction efficiency. Optimization of laser performance by varying parameters through changes in the host glass composition is discussed.     

Nd~(3+)玻璃激光器选模调Q技术的实验研究

目前国内外已有不少报道以YAG或YLF等晶体为工作介质进行预激光调Q选单纵模,并取得良好的效果,而用Nd~(3+)玻璃为工作介质进行这方面工作的报道尚属少见。众所周知,单纵模的获得是以单横模为前提的,为此我们在钕玻璃激光器上首先进行了选模(横模)调Q技术的实验,很容易就获得方向性极好的TEM_(00)模或某一低价横模的高功率激光输出,实现了     

𝒬-switched neodymium-doped phosphate glass fiber lasers

The operation of a short-pulse, 𝒬-switched, neodymium-doped fiber laser operating at 1.054 μm is described experimentally and theoretically. The laser is efficiently pumped with a single-stripe AlGaAs laser diode and emits >1 kW pulses. It is seen that due to high gain short pulses with high energy extraction efficiency can be obtained. The feature of broad emission lines associated with rare-earth-doped glasses is exploited to demonstrate tunable, 𝒬-switched operation over a 40-nm tuning range     

光敏玻璃在飞秒激光作用下的析晶

采用高温熔融法制备了银掺杂的锂铝硅酸盐微晶玻璃.经近红外飞秒激光照射和热处理后,通过显微镜观察及X射线衍射分析发现,玻璃内部形成以银原子为晶核的Li2O·Al2O3·3SiO2多晶结构微晶,晶体细小,呈乳白色,为六方晶系,呈现空间取向分布结构.飞秒激光照射部位玻璃折射率发生明显变化,出现析晶;未照射部位折射率无明显变化,仍为玻璃体.利用光致折射率变化和飞秒激光的空间选择特性,可望在玻璃内部实现微光栅、波导、微机械器件、光学掩模等微结构.     

Energy storage and heat deposition in flashlamp-pumped sensitizederbium glass lasers

Measurements of population inversion energy storage and heat deposition in flashlamp-pumped Nd:Yb:Er:glass and Cr:Nd:Yb:Er:glass lasers are reported. A thermal camera is used to measure temperature changes following isolated flashlamp pulses. A rate equation model is developed in order to determine energy storage from the output versus input energy characteristics of erbium lasers operating in a free-oscillation mode. Contributions of different sensitizers are distinguished by spectrally filtering flashlamp-pump radiation. Ratios of the deposited heat per unit stored energy in both glasses are compared for several spectral regions