Lumics GmbH

Summary ------------- Lumics offers high-power (up to 500mW) single-mode laser diodes in 7xx-15xx nm spectral range with outstanding lifetime for different applications (sensing, analytical instruments, pumping, seeding, etc.). The 14-pin butterfly package includes TEC with thermistor and PD monitor. Chips and packages have special options for pulse operation with rise time below 1ns. Stabilization of wavelength with FBG is available for all possible wavelengths as well as for CW and short nano-sec pulse operations. Product Description --------------------------- The Lumics single-mode laser module contains an optimized GaAs or InP substrate-based quantum well high-power laser diode. Industry standard 14-pin butterfly package includes TEC with thermistor and photodiode (PD) power monitor. It has been designed for customer specific applications and is available with application specific FBG’s and fibers. The extremely stringent reliability requirements are achieved through Lumics’ patented innovative facet passivation technology, careful design, exactly defined manufacturing, 100% burn-in and screening, and extensive testing. Each laser diode module is individually serialized for traceability and shipped with a specified set of test data. All devices are RoHS compliant. Wavelength and Power ------------------------------- 7xx-15xx nm range, up to 500mW (CW) – 1.2W peak power - 808nm 250mW - 850nm 200mW - 1064nm 450mW - 1080nm 300mW - 1550nm 150mW - … and many others (https://www.lumics.de/products/singlemode-diode-laser/) Power ex fiber, valid for both single-mode (SM fiber) or polarization maintaining (PM fiber). Reliability ------------- In house chip production allows to secure performance of the laser diodes emitters which are crucial for reliability of the final laser module. Experimentally checked mean-time-to-failure (MTTF) is typically 100,000 hours or more for all Lumics single mode products. This outstanding performance is guaranteed by the design of the epitaxial structure and processed wafer, as well as by the patented technology of facet coating. Environmental tests according Telcordia GR-468-CORE and MIL-STD-833E have been passed. Short pulses ----------------- For short pulses (<100ns) with moderate duty-cycle (<5%) the peak power can be increased by 2-2.5 times. Lumics chips can support operation down to nanosecond pulsing by design. But for better electrical properties we offer a low inductance option which allows to significantly reduce rise time below 1ns. Wavelength stabilization --------------------------------- High-power laser diodes are usually based on a Fabry-Pérot resonator with no selectivity for wavelength, thus the output spectrum of the laser diode can vary with operating temperature and current and also can change with operation time. Also chip to chip variation can be hardly accepted for some application. To overcome these problems one can form a resonator with fiber Bragg grating (FBG) which has a narrow reflection spectrum. In this case the operating wavelength is locked by FBG as well as spectrum width. Lumics offers FBG options for all available wavelengths. Close-to-chip FBG for short nano-sec pulsing ------------------------------------------------------------- Some applications (e.g. Destributed Temperature Sensing – DTS) require both options – pulse operation and wavelength stabilization – simultaneously. In standard wavelength stabilization configurations the FBG is placed in a ~1000mm distance from the chip. This is absolutely fine for CW operation but could result in a problem for nanoseconds pulse widths. Indeed, to establish lasing the light must travel several (3-5) times through the resonator. In case of 1000mm distance the round-trip time is ~10ns. For nanosecond pulses the electrical pump ends much earlier than the light reaches the FBG. To solve this issue Lumics offers devices with FBG placed close to the chip, thus the distance to FBG is about 40mm and the round trip for light in this resonator takes only ~0.5ns. Therefore - during electrical pulsing of 2 or 3ns - the light travels through resonator several times and the FBG defined operating wavelength dominates in lasing spectrum.