300-W cw diode-laser side-pumped Nd:YAG rod laser

Golla, D.; Knoke, S.; Schöne, W.; Ernst, G.J.; Bode, M.; Tünnermann, Andreas; Welling, H.

doi:10.1364/ol.20.001148

Cited by 41 publications

(7 citation statements)

References 8 publications

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“…And DPLs are useful in many fields, such as commerce, medicine, industry, and military. [1][2][3][4][5][6][7][8][9] Thermo-optical phenomenon has been studied for a long time, involving thermally induced focusing, stress birefringence, and mechanical rupture. On the other hand, improving the output power, i.e.…”

Section: Introductionmentioning

confidence: 99%

Optimization algorithm for the pump structure of diode side-pumped lasers

Cao

Zeng

2008

Optoelectronic Materials and Devices III

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The pump structure greatly influences the characteristics of a diode side-pumped laser. To achieve high absorption efficiency and a homogeneous pump-beam distribution simultaneously, a systemic algorithm has been established to optimize the pump structure, where multiple reflections occur on the internal wall of the reflector inside the pump chamber. The absorption efficiency and the deviation of the absorption distribution are both evaluated for a typical solid-state laser medium. A scheme for identifying an ideal pump configuration was finally obtained from several determination procedures, in which all pump structure parameters were taken into account..A novel design of an efficient, highly reliable, and good beam quality diode side-pumped solid-state laser is presented. Effort has been done to obtain a highly uniform pumping intensity in the active area, which simultaneously reduces the effects of thermal gradient. In this design a novel lens duct configuration is used. By this way a uniform power distribution and a maximum absorption of pump power is resulted. Numerical analysis also indicates the superiority of the design to other methods such as direct and diffusive pumping techniques.Keyword: optimization algorithm pump structure high efficiency

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Section: Introductionmentioning

confidence: 99%

Optimization algorithm for the pump structure of diode side-pumped lasers

Cao

Zeng

2008

Optoelectronic Materials and Devices III

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“…However, the pump-beam distribution can peak at the centre of the medium [9], resulting in an improved match of the pump distribution with the resonator mode. For lowaverage-power applications, in which thermal lensing is moderate, the overlap of the laser mode with an excitation peaked at the centre of the rod can be advantageous.…”

Section: Introductionmentioning

confidence: 99%

Diode pumping of a solid-state laser rod by a two-dimensional CPC–elliptical cavity with intervening optics

Liang¹,

Pereira²

2007

Optics Communications

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The pump radiation from a large area two-dimensional diode stack is concentrated into a cylindrical intervening optics by a first-stage 2D-CPC concentrator. The compressed radiation from the intervening optics is then efficiently coupled into a laser rod by a second-stage 2D-elliptical pump cavity. Depending on the width of the pump source, optimized rod mounting position is found through a non-sequential ray-tracing analysis. By comparing with the performance of a 2D-CPC-CPC cavity, significant improvements in both absorption efficiency and absorption distribution are achieved by a 2D-CPC-EL cavity. This asymmetric pumping scheme constitutes also an effective alternative to conventional symmetric pumping approaches.

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“…1,2 In recent studies of laser processing methods, the pulsed Nd:YAG laser, which has various advantages over the commonly used CO 2 laser, has been investigated energetically. It can be focused to a smaller point due to its short wavelength compared to the CO 2 laser.…”

Section: Introductionmentioning

confidence: 99%

Active two-pulse superposition technique of a pulsed Nd:YAG laser

et al. 1998

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In manufacturing processes, various and suitable pulse shapes are required for the purpose of materials processing, and the pulse shape is regarded as a dominant factor according to the specific property of materials. Therefore, this study has undertaken to generate the correct ones by using the two-pulse superposition technique. The pulsed Nd:YAG laser using a multi-mesh inductor L and capacitor C network and the pulse superposition technique is described. We have tried to superpose two pulses with the single shot multivibrator (SSM: 74LS123) having two silicon-controlled rectifiers (SCRs) which control the delay time of the two gate turn-on signals. One is a main rectangular pulse, and the other is a superposed sinusoidal pulse. The use of this technique might impart a number of advantages to people who need a suitable pulse shape for particular applications such as welding, cutting, and drilling. In addition, we compared the case of no superposition and applied input energy of 100 J in only the main circuit with that of superposition and applied input energy of 75 J in the main circuit and 25 J in the superposing circuit. It is found that the maximum efficiency of 4.5% is obtained within the range of delay time less than 230 s by adjusting the delay time from 0 to 1 ms. © 1998 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(98) Subject terms: materials processing; pulsed Nd:YAG laser; multi-mesh inductor L and capacitor C; pulse superposition technique; suitable pulse shape.

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300-W cw diode-laser side-pumped Nd:YAG rod laser

Cited by 41 publications

References 8 publications

Optimization algorithm for the pump structure of diode side-pumped lasers

Optimization algorithm for the pump structure of diode side-pumped lasers

Diode pumping of a solid-state laser rod by a two-dimensional CPC–elliptical cavity with intervening optics

Active two-pulse superposition technique of a pulsed Nd:YAG laser

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