共查询到17条相似文献,搜索用时 140 毫秒
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针对激光二极管阵列提出了“组合模”慨念,计算了组合模的远场分布,每个组合模在远场的空间分布呈双瓣结构,基于激光二极管阵列组合模的远场分布特征,设计了离轴外腔反馈的激光二极管阵列,运用此装置所获得激光二极管阵列的远场分布有了明显变化,与自由运转的激光二极管阵列相比,离轴外腔反馈的激光二极管阵列远场宽度减少了4.3倍,在抽运电流为16 A时,测得输出激光的功率1.82W,这相当于相同电流下自由运转激光器输出功率的79%.组合模理论不仅可以用来指导设计一维离轴外腔反馈激光二极管阵列,而且也可以用于设计二维离轴外腔反馈激光二极管阵列.二维离轴外腔反馈激光二极管阵列可以产生高功率,高光束质量输出的激光. 相似文献
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针对激光二极管阵列提出了"组合模"概念,计算了组合模的远场分布.每个组合模在远场的空间分布呈双瓣结构.基于激光二极管阵列组合模的远场分布特征,设计了离轴外腔反馈的激光二极管阵列.运用此装置所获得激光二极管阵列的远场分布有了明显变化.与自由运转的激光二极管阵列相比,离轴外腔反馈的激光二极管阵列远场宽度减少了4.3倍.在抽运电流为16 A时,测得输出激光的功率1.82 W,这相当于相同电流下自由运转激光器输出功率的79%.组合模理论不仅可以用来指导设计一维离轴外腔反馈激光二极管阵列,而且也可以用于设计二维离轴外腔反馈激光二极管阵列.二维离轴外腔反馈激光二极管阵列可以产生高功率,高光束质量输出的激光. 相似文献
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基于光谱光束组合技术,利用光栅的衍射和外腔的反馈,并通过加入光束整形系统,将标准的半导体激光阵列的发光单元锁定在窄线宽的不同波长上,以近似平行光束沿组合方向输出,以实现半导体激光阵列输出光束质量的改善和线宽的压窄。实验中采用发光单元宽度100μm,周期500μm,由19个单元构成的标准阵列,分别对快、慢轴准直后光谱组束、光束整形后光谱组束和线宽压窄外腔组束进行了实验验证,实现了组合光束与单个发光单元近似的光束质量,同时得到了较窄的线宽输出,并对实验结果进行了分析。 相似文献
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基于多波长光束组合技术,利用光栅的衍射和外腔的反馈,将激光二极管阵列(LDA)发光单元锁定在不同的波长上,以近似平行光束沿光栅的-1级衍射方向组合输出,改善LDA输出光束质量。实验采用发光单元宽度为100 μm、周期为500 μm,由19个单元构成的1 cm普通商用LDA,在连续运行最大注入电流60.6 A时,自由运转输出功率49.8 W时,获得功率为20.1 W的组合光束稳定输出,其光谱宽度为15 nm,对应的远场发散角由约70 mrad变为1.66 mrad,改善后光束质量因子约为32,其值与单个发光单元的光束质量相当。 相似文献
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针对铯蒸气激光器对窄线宽与高稳定852nm半导体激光抽运源的要求,采用体布拉格(Bragg)光栅作为外腔输出镜,研究了体Bragg光栅衍射效率对外腔半导体激光器输出光谱特性的影响。研究结果表明,衍射效率为24%、32%与37%的体布拉格光栅均能够改善半导体激光器输出光谱特性;输出光束中心波长锁定在852nm附近、输出线宽约为0.26nm;外腔半导体激光器输出波长随抽运电流、温度的变化速率分别小于10.4pm/A、7.2pm/℃,优于自由运行半导体激光器;随着光栅衍射效率增加,全系统外腔效率从91%降低至86%。 相似文献
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Achieving single-lobed far-field patterns of broad area laser diode with external cavity feedback 总被引:4,自引:0,他引:4
We demonstrate a technique for single transverse mode operation of high-power broad area laser diode (BAL). In the experiment, the HR mirror is used as an external cavity mirror and the grating is used as a wavelength selective component. By tiling the HR mirror and the grating, the number of transverse modes oscillating in the cavity can be limited and the spectral bandwidth of the laser diode can be reduced. A single-lobed near diffraction-limited laser beam with the beam divergence (FWHM) of 0.43°, the spectral line-width of 0.7 nm and the output power of 350 mW are obtained. With the feedback, the power density of the output laser beam is increased 6 times in comparison with the free running. 相似文献
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Dual-wavelength bandwidth-narrowed output of a high-power diode laser using a simple external cavity
Using an external cavity consisting of an etalon and a mirror, dual-wavelength operation of a high-power broad-area multi-stripe diode laser is achieved. The reflection of the etalon is used as the output beam of the system. The free-running bandwidth of the laser diode is about 2.0 nm. At dual-wavelength operation, the bandwidth of each wavelength component is narrowed to about 0.07 nm, while the space between them is 1.65 nm, determined by the FSR of the etalon. We obtain an available dual-wavelength output power of 2.0 W at the drive current of 6.5 A. The power ratio of the components at two different wavelengths can be changed by changing the temperature of the diode laser. To tune the wavelength of the dual-wavelength output, the temperature of the laser diode and the tilt angle of the etalon are changed simultaneously PACS 42.55.Px; 42.60.Fc; 42.60.Da 相似文献
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基于多波长光束组合技术,利用光栅的衍射和外腔的反馈,将二极管阵列的发光单元锁定在不同的波长上,相邻单元的出射光波长有微小的差异。从外腔耦合镜输出近似平行的光束,其光束质量等同于单个发光单元的光束质量,而组合光束亮度随着组合光束个数定标放大。实验中采用发光单元宽度为100 μm、填充因子为0.5、由49个单元构成的1 cm 阵列获得功率为2.39 W的输出光束,其光谱宽度为27 nm,远场光斑的直径为0.08 mm,对应的远场发散角为1.2 mrad,其光束质量因子约为28,与单个发光单元的光束质量相当。 相似文献
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We describe effective suppression of beam divergence for a high-power laser diode bar by use of an external-cavity technique. Nineteen off-axis external-cavity laser diodes of the high-power laser diode are formed by feedback with a stripe mirror. At three times the threshold current, the diverging angle (1/e2) of the external-cavity laser diode bar is reduced to 1.5 degrees from 6.6 degrees (free running) with 14.1-W peak output power and 70.4% of the radiated power of the free-running state without the external cavity. This technique effectively improves the beam quality of the high-power laser diode bar. 相似文献
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半导体光纤耦合输出泵浦源是光纤激光器的核心器件,其性能直接制约光纤激光器的输出水平。采用COS封装的高功率LD芯片,通过VBG外腔光谱锁定和精密光束整形变换技术,结合偏振合束与精密聚焦耦合技术将18个LD单元耦合进105 μm/NA0.22光纤,获得不低于260 W功率输出。实验表明,该模块在注入电流18 A时,可获得稳定输出连续功率264 W,对应电光效率52%,输出光谱中心波长975.92 nm,谱宽0.51 nm。该设计为获得高功率、高亮度波长稳定泵浦源提供了一条可行途径,光纤耦合输出模块工程化后可广泛应用在光纤激光器泵浦等领域。 相似文献