共查询到20条相似文献,搜索用时 15 毫秒
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设计了一种离轴双反馈外腔能够有效地改善激光二极管阵列的线宽和光束质量。闪耀光栅和高反镜之间形成了一个共振腔。通过调整光栅和高反镜之间的倾角可以选定一个空间模在共振腔中放大。将一个半波片插入外腔中的光栅反馈支路,来控制反馈光的数量,激光从光栅反馈支路输出。运用这项技术,在工作电流16 A,可以把激光二极管阵列的输出线宽压缩到0.15 nm,光束束宽积减小到283 mm.mrad。由于光栅的锁定作用,中心波长几乎不随温度的变化而改变。在工作电流17A时,输出激光的功率为2.44 W,斜率效率为0.5 W/A。 相似文献
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The characteristics of a wavelength tunable vertical cavity surface emitting laser diode (VCSEL) with an external short cavity are analyzed, in which the oscillation wavelength can be changed over several tens of nanometers with a nearly constant optical power by slightly altering the external cavity length. Analysis is based on rate equations for the optical power and carrier density, taking the effect of carrier-induced refractive index change into consideration, together with the study of behaviors of a complex resonator. The reflection coefficient r2 of a laser facet facing the external mirror is shown to affect notably the characteristics of wavelength tuning, optical power and carrier density for a change of the external cavity length. It is also noticed that the wavelength change for this length becomes slower with relatively larger r2 due to an increasing contribution of the effect of carrier-induced refractive index change, within the optical gain spectrum of the laser diode. 相似文献
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用磷酸氧钛钾 (KTP)作为倍频晶体 ,对Nd∶YAG声光调Q激光的环形腔外腔倍频技术进行了实验和理论的研究 ,利用最大平均功率 5 0W、声光调Q、输出频率 10 0 5Hz、灯抽运Nd∶YAG激光器做为基频光光源 ,在基频输入功率 35W时 ,获得了大约为 31.4 %的光光转换效率的绿光输出。从实验结果分析了环形腔倍频的特性 ,指出了该方法的优缺点。从光束质量和聚焦光斑直径方面 ,对基频光和二次谐波进行了比较 ,提供了利用CCD测得光斑的部分图片 ,分析了环形腔倍频的工作原理 ,解决了困扰倍频技术的转换效率问题和光束质量问题 相似文献
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New nonlinear dynamics in a semiconductor laser with optical self—feedback 总被引:1,自引:0,他引:1 下载免费PDF全文
We demonstrate a new kind of instability of the external cavity semiconductor laser,In some parameter regimes,the external cavity system will produce short and strong optical pulses in aperiodic intervals.This instability also shows low-frequency characteristics. 相似文献
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Michelson腔技术是实现激光相干合成的有效方案. 利用Michelson腔技术, 实现了全光纤结构下的两路光纤激光器的相干合成, 获得了功率为11.75 W, 效率为95.76%的相干输出. 实验研究了相干合成效率与激光腔长差的关系以及抽运对称性对相干合成效率的影响. 实验表明相干合成效率极易受激光腔长差的影响, 不同腔长差下相干合成效率差异可达18%以上, 且存在最佳腔长差; 抽运对称性对相干合成效率的影响在2%以内. 相似文献
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橘黄色波段固体激光器在基于荧光探测的生物医学诊断和显示等众多方面有着广泛的实际应用. 报道了利用532 nm的Nd∶YAG倍频激光抽运外置喇曼腔内的硝酸钡晶体,获得高效率的599 nm橘黄色喇曼激光的实验结果.对外置喇曼腔实验装置和运转参量进行了优化,喇曼振荡腔由对二阶斯托克斯光有最优化反射率的腔镜构成,对实验中所得到的二阶斯托克斯喇曼激光脉宽压缩及出现双尖峰的现象进行了分析.当抽运光功率达到4.1 W时,获得二阶斯托克斯喇曼激光功率为710 mW,输出光中心波长为599.38 nm,半峰全宽(FWHM)为1.1 nm,激光器最大光光转换效率为17.5%,斜率效率为24.8%. 相似文献
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光纤光栅外腔半导体激光器的多参量优化分析 总被引:5,自引:4,他引:1
采用多参量优化的多目标遗传算法优化了光纤光栅外腔半导体激光器(FGECL)管芯的两个端面反射率和外腔长度.研究了FGECL的阈值特性,并对多个参量优化和单个参量优化的结果进行了比较分析.表明获取最低阈值电流,要以激光器的电光转换效率和输出光功率为代价,从而得到高边模抑制比、窄光谱线宽、良好动态特性和高调制速率的FGECL.并且发现当两端面的反射率增加,同时激射波长在外腔长度中形成稳定谐振时,激光器的阈值电流达到最小值,但相应的电光转换效率和出光功率会急剧地减小. 相似文献
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Wavelength tuning characteristics of a fabry-perot semiconductor laser with an external short cavity
Wavelength tuning characteristics of a Fabry-Perot semiconductor laser with an external short cavity are analyzed, in which
the oscillation wavelength can be changed by slightly altering the external cavity length. Analysis is based on rate equations
for an optical power and carrier density. It is shown that the wavelength tuning range is dominated by a change of carrier
density through the effect of carrier-induced refractive index change in the active layer of a laser diode. This depends on
effective coupling coefficients of the optical field iteratively reflected back to the laser diode by the external mirror,
and on reflection coefficients of an anti-reflection coated laser facet and the external mirror which compose the external
cavity. The effective coupling coefficient is also derived using the waveguide theory and Kirchhoff ’s theory. Finally, an
unstable condition which may limit a stable wavelength tuning range is shown by results of a linear stability analysis of
rate equations. 相似文献
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基于有差伺服调节技术,实现了外置光学谐振腔的共振频率与钛宝石激光器工作频率的锁定.该技术采用压电陶瓷作为执行元件,通过对压电陶瓷的调制,实现了对透射激光功率的调制,并由锁相放大器解调获得伺服信号,该伺服信号经过高压放大器放大后控制压电陶瓷的伸缩来调控谐振腔的腔长,从而使腔的共振频率锁定在激光频率上.当激光上作于单一频毕时,谐振腔的谐振频率可以长时间地与激光频率保持锁定,锁定后腔的透射光功率相对起伏的稳定性为2%.当激光频率扫描时.谐振腔的谐振频率可以在2 GHz范围内不间断地与激光频率保持锁定. 相似文献
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本文从理论上分析了外腔半导体激光器的线宽压窄原理,用延时自外差法对外腔半导体激光器的线宽特性进行了测量研究,得到了线宽反比于激光器输出功率及外腔反馈率的实验结果. 相似文献
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The lowest threshold current of the external-cavity semiconductor laser with fiber Bragg grating using genetic algorithms
is investigated. Effects of the external cavity length, coupling efficiency and anti-reflection coating reflectivity on static
characteristics, such as L-I curves and side mode suppression ratios (SMSR) are investigated by using multi-mode rate equation.
It is found that the reflectivity of the anti-reflection coating for low-threshold performance needs to be increased at the
cost of the stability of the fiber grating external-cavity semiconductor laser. The optimal external cavity length obtained
by genetic algorithms can be used to obtain the lowest threshold current for sacrificing a little SMSR. However, with the
decrease of AR-coating reflectivity, output powers and SMSRs are slightly dependent on the external cavity length. 相似文献
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We report analytical and experimental studies on the characteristics of a high-brightness laser diode endpumped Nd:YVO4/KTP laser. A simple model was developed to optimize the cavity parameters and estimate the green output power of intracavity frequency doubled lasers. Using a 1 W high-brightness laser diode as the pump source, high efficiency operation was realized. The second-harmonic output power at 532 nm was measured to be 286.5 mW at an incident pump power of 881.4 mW, corresponding to an optical to optical efficiency of 32.5%. 相似文献
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基于外腔的高效频率转换, 尤其是当系统运行在抽运不消耗近似机理下, 信号光可实现大于90%的转换, 因此无法通过信号光直接获得其到腔模频率锁定的误差信号. 本文通过对信号光调制、和频光解调的方法获得了该误差信号, 实现了双波长激光到外腔腔模的级联锁定. 实验中外部环形腔将1.3 W的1064 nm抽运光放大到约14.3 W. 当1583 nm信号光从10 μW变化到50 mW, 其到636 nm和频光的转化效率约为73%; 当从50 mW变化到295 mW时, 转换效率呈线性降低到60%, 最终获得了440 mW的636 nm激光. 相似文献