High-brightness pump sources using 2D VCSEL arrays

Seurin, Jean-Francois; Xu, Guoyang; Wang, Qing; Guo, Baiming; Leeuwen, Robert van; Miglo, Alexander; Pradhan, Prachi; Wynn, J. D.; Khalfin, V.; Ghosh, Chuni

doi:10.1117/12.842492

Cited by 31 publications

(15 citation statements)

References 22 publications

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“…By stacking these devices, multi-kW output powers can be achieved which is suited for many applications (examples are given in sec. 6). As a major drawback, this yields typically to very asymmetric intensity profiles which are highly depending on the devices used.…”

Section: Process-adapted Intensity Distributionsmentioning

confidence: 97%

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Brightness and average power as driver for advancements in diode lasers and their applications

et al. 2015

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Spatial and spectral emission characteristics and efficiency of high-power diode laser (HPDL) based pump sources enable and define the performance of the fundamental solid state laser concepts like disk, fiber and slab lasers. HPDL are also established as a versatile tool for direct materials processing substituting other laser types like CO2 lasers and lamp pumped solid state lasers and are starting to substitute even some of the diode pumped solid state lasers. Both, pumping and direct applications will benefit from the further improvement of the brightness and control of the output spectrum of HPDL. While edge emitting diodes are already established, a new generation of vertical emitting diode lasers (VCSELs) made significant progress and provides easy scalable output power in the kW range. Beneficial properties are simplified beam shaping, flexible control of the temporal and spatial emission, compact design and low current operation. Other characteristics like efficiency and brightness of VCSELs are still lagging behind the edge emitter performance. Examples of direct applications like surface treatment, soldering, welding, additive manufacturing, cutting and their requirements on the HPDL performance are presented. Furthermore, an overview on process requirements and available as well as perspective performance of laser sources is derived

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Section: Process-adapted Intensity Distributionsmentioning

confidence: 97%

“…High-brightness fiber-coupled modules based on VCSELs (e.g. 30 W, 50 µm, NA 0.2) have been demonstrated since 2010 [6].…”

Section: Vertical Emitters and Edge Emittersmentioning

confidence: 99%

Brightness and average power as driver for advancements in diode lasers and their applications

et al. 2015

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“…2.3. The active diameter of the VCSEL can be reduced to just a few micrometers in order to obtain single transverse mode operation together with lowest threshold currents in the sub-100 µA range [26], but can also exceed 100 µm to get high output powers beyond 100 mW [27][28][29]. Chapter 8 of this book is entirely devoted to highpower VCSELs and arrays.…”

Section: Vcsel Design and Operation Parametersmentioning

confidence: 98%

VCSEL Fundamentals

Michalzik

2012

Springer Series in Optical Sciences

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In this chapter we outline major principles of vertical-cavity surfaceemitting laser (VCSEL) design and operation. Basic device properties and generally applicable cavity design rules are introduced. Characteristic parameters like threshold gain and current, differential quantum efficiency and power conversion efficiency, as well as thermal resistance are discussed. We describe the design of Bragg reflectors and explain the transfer matrix method as a convenient tool to compute VCSEL resonator properties in a one-dimensional approximation. Experimental results illustrate the emission characteristics of high-efficiency VCSELs that apply selective oxidation for current and photon confinement. Both the 850 and 980 nm wavelength regions are considered. The basic treatment of laser dynamics and noise behavior is presented in terms of the small-signal modulation response as well as the relative intensity noise. Finally we give some examples of VCSEL applications in fiber-based optical interconnects, i.e., optical data transmission over short distances. IntroductionVCSELs have undergone an extraordinary evolution over the past three decades. Suggested by Prof. Kenichi Iga and first demonstrated by the research group at Tokyo Institute of Technology in the late 1970s [1-3], VCSELs are a commodity item today [4] and already serve millions of computer users as the key component in modern navigation devices such as the optical mouse. In even larger quantity, this laser type has entirely replaced edge-emitting laser diodes for use in multimode fiber-based Gbit/s speed optical data transmission in premises networks and for the interconnection of various kinds of computer clusters. Several books entirely devoted R. Michalzik (B)

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“…Electrically pumped VECSELs are high-power, high-brightness semiconductor laser sources that benefit from low-cost, high-throughput production methods and ease of assembly and integration into optoelectronic devices [1][2][3][4]. They can be fabricated in 2D arrays with hundreds of emitters and combined with microlens arrays to realize high-power laser sources [4,5]. The use of an external cavity enables power scaling through the increase of the mode-field diameter, while simultaneously preserving diffraction limited beam profiles.…”

Section: Introductionmentioning

confidence: 99%

Pulse Dynamics in SESAM-Free Electrically-Pumped VECSEL

Chichkov

Yadav

Munshi

et al. 2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Self-starting pulsed operation in an electrically pumped (EP) vertical-external-cavity surface-emitting-laser (VECSEL) without intracavity saturable absorber is demonstrated. A linear hemispherical cavity design, consisting of the EP-VECSEL chip and a 10% output-coupler, is used to obtain picosecond output pulses with energies of 2.8 pJ and pulse widths of 130 ps at a repetition rate of 1.97 GHz. A complete experimental analysis of the generated output pulse train and of the transition from continuous-wave to pulsed operation is presented. Numerical simulations based on a delay-differential-equation (DDE) model of mode-locked semiconductor lasers are used to reproduce the pulse dynamics and identify different laser operation regimes. From this, the measured single pulse operation is attributed to FM-type mode-locking. The pulse formation is explained by strong amplitude-phase coupling and spectral filtering inside the EP-VECSEL.

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High-brightness pump sources using 2D VCSEL arrays

Cited by 31 publications

References 22 publications

Brightness and average power as driver for advancements in diode lasers and their applications

Brightness and average power as driver for advancements in diode lasers and their applications

VCSEL Fundamentals

Pulse Dynamics in SESAM-Free Electrically-Pumped VECSEL

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