Pulsed power system for the HAPLS Diode Pumped Laser System

Fulkerson, E.S.; Telford, S.; Deri, Robert J.; Bayramian, A.; Lanning, R.; Koh, E.; Charron, K.; Haefner, C.

doi:10.1109/ppc.2015.7296854

Cited by 7 publications

(5 citation statements)

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“…Therefore, the inductance of L 1 and L 2 are typically designed to range from tens to hundreds of microhenry which leads to inductive storage control difficulties in stage 1 by adopting digital control, such as average current control and peak current control. For example, if the MIEF-PPS total input voltage was set to a value of v in = 50 V with an inductance L = 80 μH, the minimum time required to reach inductor current of I ref = 15 A, is obtained from (1): (12) By using the first-order Taylor series expansion, the inductor current can be approximately expressed as: (13) Using (13), the current rising time would be 24 µs. Thus, the MIEF-PPS would have an inductor charging rate of 0.625 A/µs.…”

Section: A Inductive Storage Controlmentioning

confidence: 99%

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Pulse Power Supply With Faster Response and Low Ripple Current Using Inductive Storage and Interleaving Technology

Yuan¹,

Xu²

2020

CPSS TPEA

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Switched mode pulse power supply is a promising technique for high-power quasi-continuous laser driver. Contrast to lossy linear laser drivers, switched mode laser drivers can achieve higher efficiency. However, many challenges have been proposed, such as fast pulse edge, low current ripple. This paper proposes a multiphase interleaved pulse power supply with energy recovery and inductive storage (MIEF-PPS). The basic concept of the topology is the inclusion of a multiphase converter with pulse forming circuits to the converter system, which decouples the current slew rate and current ripple. Using an inductive storage technology and pulse forming circuits, a shorter pulse current rising time is obtained. The inductor energy is fed back to the input source not discharged to the load, resulting in a fast pulse trailing edge and energy saving. Thus the pulse current response observed when using this proposed technique is found to be much faster when compared to the conventional interleaved buck driver. Moreover, a pre-charge method is proposed to overcome the challenge of digitally controlling the inductive storage. The proposed topology was simulated in MATLAB/Simulink and validated against the experimental results of a laboratory prototype, 360 W dual-interleaved pulsed power supply. Index Terms-Energy recovery, fast response, multiphase interleaved, precharge control, pulse power supply. I. IntroductIonH IGH-POWER semiconductor laser arrays are vital in many fields, such as medical, industrial, and military fields, because of their advantages such as having a small volume, low weight, high efficiency, good beam quality, high reliability, and long lifespan [1]- [4]. A laser diode (LD) is a current-driven device and ha s similar characteristics to a lightemitting diode. From the voltage-current (V-I) characteristic and the characteristic curve of the optical power and injection current (P-I) of a laser diode [5], [6], it is sensitive to current

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Section: A Inductive Storage Controlmentioning

confidence: 99%

“…In general, semiconductor laser PPS drivers are classified into two types: linear drivers and switched mode drivers. Drivers with linear regulators [12]- [14] have simple structures and a low cost and generate fast enough rising and falling times, as shown in Fig. 1.…”

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confidence: 99%

Pulse Power Supply With Faster Response and Low Ripple Current Using Inductive Storage and Interleaving Technology

Yuan¹,

Xu²

2020

CPSS TPEA

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“…Pulses are then formatted from round to rectangular, and injected into the power amplifier. The power amplifier consists of two amplifier heads that are pumped by four High-Power Intelligent Laser Diode System jointly developed by LLNL and Lasertel Inc [7]. It provides ~800 kW peak power per diode array in a 300 us pulse width at repetition rate up to 20Hz and in a 5.6 x 13.8 cm 2 beam area.…”

Section: Figure 1: Laser Driven Secondary Sources Provide Fertile Gromentioning

confidence: 99%

“…Equally critical to high average power operation is the removal of heat from the amplifier head. Efficient heat management of both the HAPLS pump laser and main Ti:Sapphire amplifier is enabled by a multi-slab amplifier design cooled by room temperature, high flow speed helium gas [6,7]. Turbulent flow efficiently extracts heat from the extraction surfaces of the laser head, producing a longitudinal thermal gradient to minimize thermally induced wavefront distortion.…”

Section: Figure 1: Laser Driven Secondary Sources Provide Fertile Gromentioning

confidence: 99%

High average power, diode pumped petawatt laser systems: a new generation of lasers enabling precision science and commercial applications

et al. 2017

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“…QCW diode laser stacks have a wide variety of applications ranging from pumping solid state lasers for industrial and defense applications, to direct diode sources in the cosmetic and medical field [1,2]. Recent advances in the development of solid-state lasers for extreme high peak energy applications such as secondary sources [3] or laser based inertial confinement fusion [4,5] have the potential to significantly increase the demand and quality of such QCW sources. This will drive the requirement for QCW diode laser pump stack manufacturing technologies that not only deliver high reliability and peak power density, but also use designs suitable for high volume low-cost manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Advances in manufacturing technology for low cost QCW diode laser stacks suitable for high energy pumping applications

Barnowski,

Vethake,

Atwater

et al. 2024

High-Power Diode Laser Technology XXII

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We report a novel approach for the assembly of monolithic diode laser stacks with up to 56 laser diode bars at 0.48mm pitch. These stacks are based on 940nm laser bars AuSn soldered on CuW-submounts. By joining the 56 bar-on-submounts (BoS) using an electrically conductive material the complete continuous stack is formed. A robot is used to load these BoS into fixtures for the bonding process. We show the attachment of this monolithic stack to an insulated micro-channel cooler using electrically insulating bonding material to complete the laser module. Use of the novel bonding materials at lower joining temperatures, compared to conventional soldering processes, results in a stack assembly with lower induced stress which allows monolithic stacks with higher number of elements.We demonstrate peak power above 500W per bar at 0.3% duty cycle and 500A peak current with an average junction temperature of 45°C, with over 29kW total peak power. Analysis of the dynamic temperature behavior within the pulses is presented using fast spectral measurements and simulation along with initial reliability test results.

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Pulsed power system for the HAPLS Diode Pumped Laser System

Cited by 7 publications

References 0 publications

Pulse Power Supply With Faster Response and Low Ripple Current Using Inductive Storage and Interleaving Technology

Pulse Power Supply With Faster Response and Low Ripple Current Using Inductive Storage and Interleaving Technology

High average power, diode pumped petawatt laser systems: a new generation of lasers enabling precision science and commercial applications

Advances in manufacturing technology for low cost QCW diode laser stacks suitable for high energy pumping applications

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