Reliable QCW diode laser arrays for operation with high duty cycles

Faßbender, Wilhelm; Kissel, H.; Lotz, J.; Koenning, Tobias; Patterson, Steve; Biesenbach, Jens

doi:10.1117/12.2253837

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…Several industrial suppliers have publicly reported multi-100 kW diode laser pump modules for high-energy-class laser systems, and a brief summary of current status was recently presented at the 6 th European Advanced Accelerator Concepts (EAAC) workshop [19], collecting input from TRUMPF, due to their role as providers of pumps for DIPOLE [17,20], Leonardo, due their role as providers of pumps for HAPLS [21] and Coherent and Jenoptik, due to their publication record on supply of pumps for high-energy-class systems [22,23]. Other suppliers are also active (e.g.…”

Section: Status Of Industrial Diodesmentioning

confidence: 99%

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Crump,

Gizzi

2024

High-Power Diode Laser Technology XXII

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Diode laser pumps are a critical technology for advanced accelerators based on laser plasma accelerators, and essential system components when higher repetition rate operation is needed. They are also a significant cost element in larger systems. An overview of progress in research and industry is presented, summarizing status of the technology, focusing on efforts to economically scale peak and average power and to enable new options in plasma acceleration, for example the use of thulium-doped gain media with its pumping wavelength at 780 nm. Development needs to support the accelerator community will be collected, covering topics such as efforts to lower cost in €/W by raising the diode laser output power, to increase repetition rates to 100 Hz and even up to 1 kHz, to scale TRL of emerging diode laser technologies, and to ensure low-failure-rate operation of large systems.

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Section: Status Of Industrial Diodesmentioning

confidence: 99%

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Crump,

Gizzi

2024

High-Power Diode Laser Technology XXII

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“…. 2 mm vertical pitch [7], cooled along the 1-cm wide rear edge). The more effective heat spreading and high heat capacity due to larger volume of metal enables higher duty cycles and longer pulses without compromising B or η E .…”

Section: Module Designmentioning

confidence: 99%

“…Commercially available pump sources that can potentially deliver these parameters consist of stacks or arrays of high-energy class diode lasers (HEC-DL) in 1-cm bar format, with each bar combined with a fast axis collimation (FAC) lens. The bars are collected into pump modules, including customised optics for beam shaping and homogenizing [7][8][9][10][11][12]. There are two main configurations.…”

Section: Introductionmentioning

confidence: 99%

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Novel High-Power, High Repetition Rate Laser Diode Pump Modules Suitable for High-Energy Class Laser Facilities

et al. 2019

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The latest generation of high-energy-class pulsed laser facilities, under construction or planned, such as EuPRAXIA, require reliable pump sources with high power (many kW), brightness (>1 MW/cm2/sr) and electro-optical conversion efficiency (>50%). These new facilities will be operated at high repetition rates (around 100 Hz) and only diode lasers are capable of delivering the necessary performance. Commercial (quasi-continuous wave, QCW) diode laser pulse-pump sources are, however, constructed as low-cost passively cooled stacked arrays that are limited either in brightness, efficiency or repetition rate. Commercial continuous wave diode laser pumps constructed using microchannel coolers (as used in high-value industrial machine tools) can fulfil all requirements, but are typically not preferred, due to their cost and complexity and the challenges of preventing cooler degradation. A custom solution is shown here to fill this gap, using advanced diode lasers in a novel passive side-cooling geometry to realize 100 … 200 Hz pump modules (10%–20% duty cycle) that emit peak power of 6 kW at wavelength = 940 nm. The latest performance of these modules is summarized and compared to literature. We show that a brightness >1 MW/cm2/sr can be efficiently delivered across a wide range of laser pulse conditions with 10% duty cycle (pulse width: 100 µs … 100 ms … cw, repetition rate up to 1 kHz). Furthermore, we describe how these pumps have been used to construct and reliably operate (>109 pulses without degradation) in high-energy-class regenerative and ring amplifiers at the Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI). We also show first results on 100 Hz pumping of cryogenically cooled solid-state Yb:YAG slab amplifiers, as anticipated for use in the EuPRAXIA laser, and note that peak temperature is disproportionately increased, indicating that improved cooling and more detailed studies are needed.

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“…Quasi-continuous-wave operation of a laser diode means that its pump source is switched on only for certain time intervals being short enough to reduce thermal effects significantly, but still long enough that the laser process is close to its steady state [2] . Therefore, working in QCW mode can effectively reduce thermal lensing effect damage due to overheating [3] .…”

Section: Introductionmentioning

confidence: 99%

Investigation on the performance of high power long pulse laser diode arrays for hair removal and illumination

Chen¹,

Ma²,

Yang³

et al. 2023

Components and Packaging for Laser Systems IX

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By designing a lightweight and compact stacked bar package, we can achieve high-power, high-brightness, and high-stability pulse laser output. The laser diode package consists of eight 1cm high power laser bars, which are bonded between two copper-tungsten heat sinks with AuSn hard solder like a sandwich. These sandwiches are bonded in a second soldering step on a backplane macro-channel cooler. The package structure is very compact and lightweight. We can achieve different frequency, pulse width, duty cycle combinations, which easily allows to adapt to different applications.In this paper, the performance of 808nm and 940nm laser bars is verified under different conditions: The pulse width is varied from 5 to 300ms, and the frequency range is between 1Hz to 10Hz. Resulting duty cycles range from 10% to 40%.In addition this structure can combine two or more wavelengths (808nm and 940nm, 760 and 1060 optional). We achieve 1788W under the condition of 5ms, 10%DC, 200A. This compact and powerful 2D diode laser array with mixed wavelengths is very suitable for laser hair removal. It can not only fully act on the melanin of the hair follicle, but also coagulate the micro vessels around the hair follicle to cut off the blood supply of the hair follicle. With the right combination of wavelength, the penetration depth and absorbtion characteristics can be tailored to the different skin types from white to dark skin, avoiding skin irritation and pain.For pulsed pumping applications or far field illumination, FAC lenses can be applied to allow for best beam brightness. The package can be designed from single bar to 12 bars, depending of the power demand for the individual applications. Dense packaging of more than one stack in one laser unit allows high application power of multiple kW in a compact handpiece design for hair removal.

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Reliable QCW diode laser arrays for operation with high duty cycles

Cited by 9 publications

References 4 publications

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Novel High-Power, High Repetition Rate Laser Diode Pump Modules Suitable for High-Energy Class Laser Facilities

Investigation on the performance of high power long pulse laser diode arrays for hair removal and illumination

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