Eye safe high power laser diode in the 1410-1550nm range

Abstract

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.

Optofluidics based lab-on-chip device forin situmeasurement of mean droplet size and droplet size distribution of an emulsion

“…However, expensive, high power, potentially hazardous laser sources in the visible range (400 nm-650 nm) were used in these works. In contrast, in the present work, a cost effective, low power (1.0 mW), and nonhazardous [48] laser source near infrared range (1550 nm) was used for the sample illumination. In the previous works, a range of complicated and expensive optical detection systems including microscope coupled spectrometer [46], photon multiplier tubes (PMT) [40], and avalanche photodiode (APD) [42] were used for the measurements.…”