Stacking of multiple laser junctions within one device structure enables significantly higher output powers per mm2 device size than in conventional diode lasers. This technology makes edge emitting lasers (EEL) and VCSEL favorable for LiDAR applications. In this paper, we show our current performance of multi-junction EEL and VCSEL for industrial and automotive LiDAR applications. We demonstrate output power densities exceeding 1.2 kW/mm2 from a VCSEL array as well as output powers of 285 W from an EEL with a footprint of only 400x600 μm2. In addition, we propose a solution for the spectral shift in EEL using a wavelength stabilization technology achieving 0.04 nm/K on average in a temperature range of -35°C to 105°C.
We report on the development of the latest generation of high power laser diodes at 14xx nm wavelength range suitable for industrial applications such as plastics welding and medical applications including acne treatment, skin rejuvenation and surgery. The paper presents the newest chip generation developed at II-VI Laser Enterprise, increasing the output power and the power conversion efficiency while retaining the reliability of the initial design. At an emission wavelength around 1440 nm we applied the improved design to a variety of assemblies exhibiting maximum power values as high as 7 W for broad-area single emitters. For 1 cm wide bars on conductive coolers and for bars on active micro channel coolers we have obtained 50 W and 72 W in continuous wave (cw) operation respectively. The maximum power measured for a 1 cm bar operated with 50 μs pulse width and 0.01% duty cycle was 184 W, demonstrating the potential of the chip design for optimized cooling. Power conversion efficiency values as high as 50% for a single emitter device and over 40% for mounted bars have been demonstrated, reducing the required power budget to operate the devices. Both active and conductive bar assembly configurations show polarization purity greater than 98%. Life testing has been conducted at 95 A, 50% duty cycle and 0.5 Hz hard pulsed operation for bars which were soldered to conductive copper CS mounts using our hard solder technology. The results after 5500 h, or 10 million “on-off” cycles show stable operation.
We report on high power wavelength stabilized single-mode lasers operating at ~1060 nm. Due to their capability of fast
gain switching (<1 ns) and internal wavelength stabilization, distributed feedback (DFB) lasers are attractive for
utilization as an ultrafast seeder for MOPA fiber laser systems. We successfully developed narrow band single mode
DFB laser emitting at the wavelength of ~1060 nm and providing >1.5W of peak power in pulse mode. Time response of
the DFB lasers was analyzed using both small and large signal modulation techniques. Furthermore, we present the
results of integration of DFB lasers into subnanosecond fiber laser system. We obtained spectrally narrow (~50 pm)
optical pulses as short as 170 ps with peak power of ~7 kW.
In this paper we present the 830nm single mode lasers for consumer electronics and computer to plate applications. One
of the key criteria is to develop a robust as well as cost effective design that enables high yield and high reliability
operation. We will present results obtained on single transverse mode, single emitters or arrays of Fabry Perot lasers and
single longitudinal mode lasers emitting in the range of 830nm exhibiting superior reliability performance.
The demand for high power lasers emitting in the 14xx-15xxnm range is growing for applications in fields such as
medical or homeland security. We demonstrate high power laser diodes with emission at 1430, 1470 and 1560 nm.
Single multimode emitters at 1470nm emit about 3.5W in CW operation. Power conversion efficiency can reach values
as high as 38.5%. With this base material, single and multi-emitter fiber coupled modules are built. Additionally, bars on
passive and microchannel coolers are fabricated that deliver 25W and 38W respectively in CW mode, while obtaining
more than 80 W in pulsed mode. All reliability tests show an outstanding stability of the material with no signs of wearout
after 3750 hrs under strong acceleration conditions.
Bars with high and low filling factors serve the different schemes for beam transformation and fiber coupling. We report on highly efficient 8xx bars for operation in excess of 100 W and reliable broad-area single-emitter lasers (BASE) with 90 um aperture being capable to deliver in excess of 10 W from a 105 um core fiber. For 9xx bars we present solutions with power levels per device ranging from 60 W to 300 W corresponding to linear power levels beyond 8.5 W per 100 um stripe width indicating convergence of BAR and BASE devices. Life test results for these devices will be shown and high brightness fiber coupled solutions will be discussed.
High performance vertical cavity surface emitting lasers (VCSELs) emitting in the 1310 nm waveband are fabricated by bonding AlGaAs/GaAs distributed Bragg reflectors (DBRs) on both sides of a InP-based cavity containing 5 InAlGaAs quantum wells using the localized wafer fusion technique. A tunnel junction structure is used to inject carriers into the active region. Devices with 7 μm aperture produce single mode emission with 40 dB side-mode suppression ratio.
Maximum single mode output power of 1.7 mW is obtained in the temperature range of 20-70°C. Modulation capability at 3.2 Gb/s is demonstrated both at room temperature and 70°C with rise time and fall time values of eye diagrams bellow 120 ps. Overall device performance complies with the requirements of 10 GBASE-LX4 IEEE.802.3ae standard.
In this paper, we will present the recent progress of electrically-pumped directly-modulated tunable 1550 nm VCSEL development at Bandwidth9. The device is fabricated from an all epitaxial VCSEL structure grown on an InP substrate, with a monolithically integrated tuning arm for continuous wavelength tuning. We have demonstrated over 1 mW CW output power and over 20 nm tuning range in C-band and error free transmission performance at 2.5 Gbps over 100 km SMF-28 fiber. The reliability test data of the tunable VCSELs shows a projected failure rate of less than 400 FITS.
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