25-W 915-nm Lasers With Window Structure Fabricated by Impurity-Free Vacancy Disordering (IFVD)

Taniguchi, Hidehiro; Ishii, Hisayoshi; Minato, Ryuichiro; Nakasaki, R.; Ohki, Y.; Namegaya, T.; Kasukawa, A.

doi:10.1109/jstqe.2007.903373

Cited by 33 publications

(21 citation statements)

References 6 publications

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“…Current blocking stripes located at the front facet of the laser represent one option, while packaging with overhang is even simpler. -Non-absorbing mirrors [54][55][56][57][58][59][60][61][62]. This approach, sometimes called window laser, involves the artificial reduction of the modal absorption of the close-to-facet gain material.…”

Section: Robustness Of Diode Lasers Against Codmentioning

confidence: 99%

Mechanisms and fast kinetics of the catastrophic optical damage (COD) in GaAs‐based diode lasers

Tomm

Ziegler

Hempel

et al. 2011

Laser & Photonics Reviews

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Semiconductor lasers are the most efficient manmade narrow-band light sources and convert up to threequarters of electric energy into light. High-power diode lasers are characterized by very high internal power densities in their small cavity, resulting in local heating and sometimes device degradation. Catastrophic optical damage (COD) of diode lasers is a relevant degradation mechanism and limit for reaching ultrahigh optical powers. An overview is given on research activities targeting the mechanisms being relevant for the COD process in GaAs-based diode lasers emitting in the 630-1100 nm range. The discussion of experiments, where COD is artificially provoked, represents the main topic. The sequence of events and fast kinetics taking place on a nanosecond to microsecond time scale are addressed. A particular emphasis is laid on recent experimental work performed in the authors' laboratories. Paving the way for knowledge-based solutions towards more robust diode lasers represents the ultimate goal of this work. COD diagram determined for a batch of broad-area AlGaAs diode lasers. The time to COD within a single current pulse is plotted versus the actual average optical power in the moment when the COD takes place. Full circles stand for clearly identified COD events (right ordinate), whereas open circles (left ordinate) represent the pulse duration in experiments, where no COD has been detected. A borderline (gray) exists between two regions, i. e., parameter sets, of presence (orange) and absence of COD (blue). This borderline is somewhat blurred because of the randomness in filamentation of the laser nearfield and scatter in properties of the involved individual devices.

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Section: Robustness Of Diode Lasers Against Codmentioning

confidence: 99%

Mechanisms and fast kinetics of the catastrophic optical damage (COD) in GaAs‐based diode lasers

Tomm

Ziegler

Hempel

et al. 2011

Laser & Photonics Reviews

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“…4 that diode lasers cover a large spectral range with increasing output power towards the near-infrared. Up to 25 W were obtained with broad area devices between 800-1000 nm [81]. This wavelength range coincides with a local maximum in the absorption spectra of blood.…”

Section: Performance Characteristics Of Diode Lasersmentioning

confidence: 71%

“…However, the absorption coefficient of hemoglobin is reduced by more than one order of magnitude but still sufficient to obtain the effect. Available diode lasers are capable of emitting multiple tens of watts [81,82] and can easily be coupled into multimode fibers for direct delivery. By providing sufficient optical energy in the most efficient and compact manner, whilst the beam propagation parameters not being crucial, these high-power, near-infrared diode lasers have become very attractive light sources for photocoagulation.…”

mentioning

confidence: 99%

Diode laser based light sources for biomedical applications

Müller

Marschall

Jensen

et al. 2012

Laser & Photonics Reviews

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Diode lasers are by far the most efficient lasers currently available. With the ever-continuing improvement in diode laser technology, this type of laser has become increasingly attractive for a wide range of biomedical applications. Compared to the characteristics of competing laser systems, diode lasers simultaneously offer tunability, high-power emission and compact size at fairly low cost. Therefore, diode lasers are increasingly preferred in important applications, such as photocoagulation, optical coherence tomography, diffuse optical imaging, fluorescence lifetime imaging, and terahertz imaging. This review provides an overview of the latest development of diode laser technology and systems and their use within selected biomedical applications. 670 nm external cavity diode laser for Raman spectroscopy built on a 13 × 4 mm 2 microbench (Copyright FBH/Schurian.com).

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“…One of the most promising approaches to solving the COMD problem is introduction of a window (a transparent region to laser light) by quantum well intermixing (QWI) and reduce optical absorption at the facet. QWI can be achieved by the various methods, such as impurity induced disordering, ion irradiation induced intermixing, and impurity-free vacancy disordering (IFVD) [3,4]. Among them, IFVD is considered to be the most promising technique because it retains high crystal quality and low optical propagation losses.…”

Section: Introductionmentioning

confidence: 99%

High-power and high-efficiency 915 nm broad-area laser diodes with window structure

Morita

Nagakura

Torii

et al. 2012

ISLC 2012 International Semiconductor Laser Conference

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25-W 915-nm Lasers With Window Structure Fabricated by Impurity-Free Vacancy Disordering (IFVD)

Cited by 33 publications

References 6 publications

Mechanisms and fast kinetics of the catastrophic optical damage (COD) in GaAs‐based diode lasers

Mechanisms and fast kinetics of the catastrophic optical damage (COD) in GaAs‐based diode lasers

Diode laser based light sources for biomedical applications

High-power and high-efficiency 915 nm broad-area laser diodes with window structure

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