共查询到20条相似文献,搜索用时 15 毫秒
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为简化高功率激光器谐振腔结构,提高激光谐振腔的稳定性,增加基模体积,改善光束质量,提出了两种新型激光谐振腔结构,分别是带角隅反射镜的激光谐振腔和直角内圆锥面反射镜激光谐振腔。使用高功率脉冲CO2激光器,研究了这两种激光谐振腔的输出特性和腔镜失调的关系,并结合平凹稳定腔,对三种激光谐振腔的抗失调稳定性进行了对比。实验结果表明,随着全反镜或平面输出镜失调角的增加,角隅腔激光器的单脉冲输出能量下降速度小于直角内圆锥面全反镜腔。两种新型谐振腔全反镜的抗失调稳定性都超过平面输出镜。角隅全反镜谐振腔和直角内圆锥面全反镜谐振腔的抗失调稳定性均大大超过平凹稳定腔。 相似文献
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A high power cw CO2 laser beam is generated from a resonator configuration having an axicon mirror as its end reflector. The properties of this beam are evaluated in terms of its polarization, focusing capability and temporal stability and the resulting effects on processing materials are presented. A comparison is made between a folded and a straight resonator having a spherical focusing mirror as its end reflector. 相似文献
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Lizhi Dong Wenjin Liu Ping Yang Bing Xu Xiang Lei Yu Ning Hu Yan 《Optics Communications》2011,284(7):2003-2006
Misalignment of a laser cavity would result in the displacement of beam location on the cavity mirrors. We present a simple method for automatic cavity alignment of a solid-state laser through detecting the location of the laser beam on the rear mirror, with which neither external alignment beams nor modifications to the cavity are required. The rear mirror of the laser cavity is replaced by a tip/tilt mirror to compensate for the misalignment. Experiments show that this method could effectively correct the misalignment of the laser cavity and restore the output power to almost the original value when the resonator is well aligned. 相似文献
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We demonstrate a terahertz-wave parametric oscillator (TPO) with a corner-cube resonator consisting of a corner-cube prism (CCP) and a flat mirror. By using the cavity configuration proposed in this Letter, the generation of tunable monochromatic terahertz (THz) waves can be achieved just by rotating the flat mirror instead of rotating the TPO cavity relative to the pump beam. The THz-wave output intensity and pulse width can be controlled periodically by rotating the CCP around the cavity axis. The TPO stability against cavity misalignment is significantly improved by at least 1 to 2 orders of magnitude compared with the conventional plane-parallel resonator configuration. 相似文献
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Combining one stable resonator with a concave mirror and a coupling-hole plane mirror, and another unstable resonator having a concave mirror and a convex mirror, a new hybrid optical resonator type laser has been proposed by overlapping the concave mirror as a common one and fitting the convex mirror exactly to the coupling-hole. Using theABCD law, the so-called g-parameters are first found for beam confinement. Then, based on the eigen-equation, the field distribution on the plano-convex mirror is obtained with the g-parameters above. Knowing this field distribution results in an effective transmittanceG e e. Finally, the ratio of the inner convex to outer plane mirror radii can be determined for an optimum coupling in both the limiting cases of homogeneously and inhomogeneously broadened gain media. Some numerical examples will also be given for a CO2 laser having the proposed hybrid resonator. 相似文献
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分析了角锥棱镜对光束的相位变换作用,带二面角误差的角锥棱镜可等效于6块光楔的组合,其楔角的大小和方向由二面角误差决定。对在腔内往返传输的光线在镜面上的位置进行了分析,结果表明:3个二面角误差相同且不为零的角锥棱镜构成的谐振腔为约束非稳腔。用Fox-Li迭代法数值模拟得到了不同棱镜二面角误差情况下的谐振模式。模拟结果表明:圆形镜腔情况下基本振荡模式接近于TEM03模的拉盖尔高斯光束;当3个二面角误差不相同时,模式中各个区域的强度分布不对称。采用3个二面角误差基本接近且绝对值较小的棱镜可以提高光束质量。 相似文献
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A. P. Napartovich N. N. Elkin D. V. Vysotsky 《Optical and Quantum Electronics》2011,42(11-13):765-770
Numerical model is developed for modeling pulsed operation of a vertical external cavity semiconductor laser (VECSEL) with a resonant gain structure. Properties of optical modes for compound resonator formed by Bragg reflector, chip boundary and external spherical mirror were studied. For above threshold operation carrier density in each of quantum wells (QW) obeys non-linear diffusion equation with a source supplied by electron-hole pairs generated in barrier layers by pump radiation or fast electron beam. A new iteration procedure for round-trip operator evaluation was developed, which provides linear growth of computation time with the number of QWs. Results of numerical simulations are reported for a VECSEL comprising 25 QW in resonant configuration and the output spherical mirror with curvature radius 3 cm. Variation of distance to the external mirror is found to result in notable changes in power and optical quality of the output beam. The decisive role of gain and index non-linearity in these changes is identified. A range of values of distance to external mirror is found where iterative procedure does not converge. In another range, the resulting solution depends on the initial conditions for the iteration procedure. 相似文献
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A new controllable laser beam shaping technique is demonstrated, where a magnetic fluid-based liquid deformable mirror is proposed to redistribute the laser phase profile and thus change the propagation property of the beam. The mirror is driven by an inner miniature actuator array along with a large outer actuator. The inner actuator array is used for deforming the magnetic fluid surface, while the outer actuator is used to linearize the fluid surface response and amplify the magnitude of the deflection. In comparison to other laser beam shaping techniques, this technique offers the advantages such as simplicity, low cost, large shape deformation, and high adaptability. Based on a fabricated prototype of the liquid deformable mirror, an experimental AO system was set up to produce a desired conical surface shape that shaped the incident beam into a Bessel beam. The experimental results show the effectiveness of the proposed technique for laser beam shaping. 相似文献
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为了获得大功率高亮度的激光光源,设计并实现了一种使用双棒串接的基模动态稳定谐振腔.通过补偿热致双折射效应以及合理地设计腔内参数,在使用闪光灯抽运的条件下获得了61W的基模连续输出.使用等效热透镜的方法分析了谐振腔参数对激光器性能的影响,解释了输出镜和全反镜的距离对激光器性能所起的不同作用.
关键词:
动态稳定腔
双棒
谐振腔模式 相似文献
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以掺铜的钾钠铌酸锶钡晶体作为猫式自泵浦位相共轭镜,研究了位相共轭光的反馈对氩了激光器的输出功率,阈值工作电流,纵模及横模特性的影响,并对其机理进行了分析和讨论。 相似文献
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Widely tunable linear-cavity multiwavelength fiber laser with distributed Brillouin scattering 总被引:1,自引:0,他引:1
We demonstrate a multiple wavelength Brillouin/erbium fiber laser in a linear cavity configuration.The laser cavity is made up of a fiber loop mirror on one end of the resonator and a virtual mirror generated from the distributed stimulated Brillouin scattering effect on the other end.Due to the weak reflectivity provided by the virtual mirror,self-lasing cavity modes are completely suppressed from the laser cavity.At Brillouin pump and 1480-nm pump powers of 2 and 130 mW,respectively,11 channels of the demonstrated laser with an average total power of 7.13 dBm can freely be tuned over a span of 37-nm wavelength from 1530 to 1567 nm. 相似文献
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P. Yang X. Lei R. Yang M. Ao L. Dong B. Xu 《Applied physics. B, Lasers and optics》2010,100(3):591-595
We demonstrate that an intracavity deformable mirror (DM) is capable of compensating for the aberrations of a continuous-wave (CW) Nd:YAG solid-state laser and improving its far-field peak power fast and stably. The deformable mirror is controlled by a stochastic parallel gradient descend (SPGD) algorithm. Experimental results reveal that high-order-like transverse modes can be transformed into Gaussian-like modes quickly without any pinhole added in the laser cavity. At the same time, the far-field peak powers are also increased to different extents. 相似文献
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大功率部分端面抽运混合腔板条激光器 总被引:22,自引:4,他引:18
在半导体抽运的全固态激光器中,激光晶体上的热畸变限制了激光器在大功率下输出时保持高光束质量的能力。板条结构的固体激光器具有优异的散热能力,再配合部分端面抽运以及稳一非稳柱面混合腔的使用,使大功率高光束质量的激光输出成为可能。在德国EdgeWave GmbH进行的对这一技术的合作研究中,利用不到100mm的腔长,在Nd:YVO4板条激光器上获得了110W近衍射极限的1.06μm连续激光输出,这时在非稳腔方向上的光束传播因子M^2为1.3。在稳腔方向上为1.5。通过对输出激光进行空间滤波切除腔镜造成的衍射旁瓣后,50W输出时M^2的典型值在非稳腔和稳腔方向上分别为1.09和1.2。 相似文献
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High beam quality in a HyBrID copper laser operating with an unstable resonator made of a concave mirror and a plano-convex BK7 lens 总被引:1,自引:0,他引:1
Madalena Alice Priante Gio Walter Miyakawa Nicolau Andr Silveira Rodrigues Denise Maria Zezell Rudimar Riva Marcelo Geraldo Destro Jaime Tsutomu Watanuki Carlos Schwab 《Optics & Laser Technology》2006,38(7):523-527
This paper presents a very simple unstable resonator, made of a concave mirror (total reflector) and a bare plane–convex BK7 lens working as a convex coupling mirror, which is quite efficient for HyBrID copper laser. In addition to a good quality factor (M2=4.9), experimental results showed that it is possible to control the laser output power by introducing a variable aperture iris inside the cavity, close to the coupling lens, without spoiling beam quality. A rough theoretical model helped to explain these results as a combined effect of unstable resonator plus radial gain distribution. 相似文献
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L. Winkelmann O. Puncken R. Kluzik C. Veltkamp P. Kwee J. Poeld C. Bogan B. Willke M. Frede J. Neumann P. Wessels D. Kracht 《Applied physics. B, Lasers and optics》2011,102(3):529-538
A solid-state laser system for the next generation of gravitational wave detectors with an output power of 220?W at the wavelength of 1064?nm is presented. Single-frequency operation of the laser was achieved by injection-locking of a high-power ring oscillator to an amplified non-planar ring oscillator (NPRO) following the Pound?CDrever?CHall scheme. The high-power stage which features four longitudinally pumped Nd:YAG laser crystals as active media in a ring resonator configuration was designed for reliable long term operation. Using a non-confocal ring cavity to filter the output beam, a pure TEM00 mode with 168 W output power was obtained. 相似文献
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500.8 nmNd∶YAG青光激光器光学薄膜的设计与制备 总被引:5,自引:2,他引:3
从双波长激光运转及和频的机理出发,对LD泵浦Nd∶YAG,LBO腔内和频500.8 nm〖JP2〗青光激光器所使用的光学薄膜进行了设计和制备.在激光反射镜的设计上,为了达到最佳的和频输出,对膜系要求进行了深入分析.采用对谐振腔一端面反射率固定不变并通过对另一腔镜基频光的透射率进行调谐的方法, 在给出合理初始结构后,利用计算机对膜厚进行了优化.并采用双离子束溅射沉积的方法,通过时间监控膜厚法成功制备出青光激光器所使用的全介质激光反射膜, 在室温下实现946 nm和1064 nm双波长连续运转,并通过Ⅰ类临界相位匹配LBO晶体腔内和频在国内首次实现500.8 nm青色激光连续输出.当泵浦注入功率为1.4 W时和频青光最大输出达20 mW. 相似文献