KW-class industrial diode lasers comprised of single emitters

Price, Kirk; Pfeffer, F.; Leisher, Paul O.; Karlsen, Scott; Martinsen, R.

doi:10.1117/12.842164

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…Fiber-coupled laser-diode (LD) modules for small-core fibers consistently use single-emitters as the light sources [1][2][3][4][5][6] . Due to their individual nature, single emitters can be mechanically-positioned precisely and can be selected for high performance and reliability.…”

Section: Introductionmentioning

confidence: 99%

Record CW-brightness from a single 20% fill-factor 1-cm laser-diode bar at 20°C

Chin¹,

Knapczyk

Jacob

et al. 2011

SPIE Proceedings

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A record, 250W, CW output-power has been achieved for a single, 1cm-wide, 3.5mm cavity-length, 20% fill-factor, 976nm, laser-diode bar operated at 20°C. The remarkable laser-bar performance was in part the result of a novel EPIC (Enhanced Performance Impingement Cooler) heat-sink with a thermal resistance of 0.16K/W. The superb thermal management resulted in record brightness for a laser bar, i.e. a slow-axis divergence of 10° (95% power containment angle) was achieved at 200W output-power. A coupling efficiency of ~74% into a 200μm core, 0.22NA fiber was achieved.

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Section: Introductionmentioning

confidence: 99%

Record CW-brightness from a single 20% fill-factor 1-cm laser-diode bar at 20°C

Chin¹,

Knapczyk

Jacob

et al. 2011

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…This leads to degraded thermal resistance of channel causing increase in junction temperature. Increased junction temperature shifts the emission wavelength and significantly reduces output power which eventually leads to diode failure 8 . Conductively cooled diode laser bars are next developed to overcome the drawbacks of micro-channel cooled bars and provide the high output power with straightforward cooling requirements and improved reliability.…”

Section: Evaluation Of 976 Nm Multimode Single Emitter Laser Diodes Fmentioning

confidence: 99%

“…Conductively cooled diode laser bars are next developed to overcome the drawbacks of micro-channel cooled bars and provide the high output power with straightforward cooling requirements and improved reliability. Single-emitter based architectures provide improved overall brightness and low cost compared to conductively cooled bars 7,8 . Single emitter laser diode systems provide best laser diode performance and reliability.…”

Section: Evaluation Of 976 Nm Multimode Single Emitter Laser Diodes Fmentioning

confidence: 99%

“…Development of techniques for efficiently coupling multiple emitters into a single fiber and improved diode laser brilliance has increased amount of power coupled into a single 105 µm fiber up to 100 W 9,10 . Multiple emitter fiber-coupled modules consisting of several single emitter broad area lasers (BALs) are the building block for pump modules for industrial and defense fiber laser systems due to their high brightness, excellent reliability, low production cost and high optical-tooptical efficiency [7][8][9][10] . Theoretical studies shows that Yb-doped fiber laser pumped with broad spectral width (< 5 nm) non-wavelength stabilised laser diode assembly have 70 per cent optical-tooptical efficiency for 14.5 m active fiber length.…”

Section: Evaluation Of 976 Nm Multimode Single Emitter Laser Diodes Fmentioning

confidence: 99%

“…The series connection of the diode lasers reduces the operating current enabling rapid power adjustments and pulsed operation while preserving diode reliability. They can be packaged in an environmentally sealed box providing decreased package induced failure (PIF) 7,8 . Development of techniques for efficiently coupling multiple emitters into a single fiber and improved diode laser brilliance has increased amount of power coupled into a single 105 µm fiber up to 100 W 9,10 .…”

Section: Evaluation Of 976 Nm Multimode Single Emitter Laser Diodes Fmentioning

confidence: 99%

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Evaluation of 976 nm Multimode Single Emitter Laser Diodes for Efficient Pumping of 100 W+ Yb-doped Fiber Laser

et al. 2016

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Experimental evaluation of spectral and power-current (P-I) characteristics of fiber coupled single emitter multimode laser diodes used for development of efficient pumping assembly is reported. Fiber coupled laser diodes emitting around 976 nm are best suited for pumping Yb-doped fiber lasers because of excellent coupling efficiency and reduced thermal load. We have experimentally investigated emission spectrum of fiber coupled multimode laser diodes at different temperatures and drive currents. It is found that peak emission wavelength shifts towards the longer wavelength with increase in temperature and drive current. P-I characteristics of fiber coupled laser diodes have been obtained and presented for drive current from 0.4 A to 11.5 A. Based on experiment, we have constructed spectrally matched laser diode assembly for efficient pumping of 100 W fiber laser. It requires very precise control of temperature and drive current to maintain the emission spectrum. Total 162 W power is pumped in to the Ybdoped fiber laser cavity through multi-mode pump combiners and we have obtained 110 W fiber laser output power @1070 nm. The achieved optical-to-optical efficiency is 68 per cent.

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