Visit us at Photonics West 2015
Publish Date: 2015-01-05


Welcome to visit BWT Beijing’s booth #8934 at BIOS Expo 2015, and booth #934 at Photonics West 2015, the most comprehensive #1 laser, photonics, and biomedical optics conference during 7-12 February 2015. 

Technical papers presented by BWT Beijing at the LASE - High-Power Diode Laser Technology and Applications XIII (Conference 9348): 

Session 5: High Power Device Reliability 

Date: Monday, 9 February 2015

Time: 8:00 AM - 8:20 AM

Paper 9348-19: Reliability study of high brightness multiple single emitter diode lasers

Presenter: Thomas Yang 

High brightness pumps based on multiple single emitters offer significant advantages in thermal management and reliability for pumping high-power fiber lasers. The lifetime of the high brightness pump lasers are from the laser diode chips and the multi-emitter packages. In this study, we optimized the chip bonding processes for various chips including 9xxnm 10W-20W, 1470nm 6W types which were from various suppliers around the world, and achieved suitable chip bonding processes to produce high performance and reliable chip-on-submount. Then, in this paper, a series of accelerated life tests were performed on 2-emitter to 7-emitter packages with 9xxnm/105um fiber coupled modules. The MTTF of these modules exceeds 100k hours. Finally, we present a separate reliability study on wavelength stabilized 976nm fiber coupled diode. 

Session 7: High Power Devices III 

Monday, 9 February 2015

2:10 PM - 2:30PM

Paper 9348-31: High brightness 9xxnm fiber coupled diode lasers

Presenter: Thomas Yang 

In this paper, we report on the development of a high brightness laser diode module capable of coupling 100W of output power with a 105μm 0.15NA fiber at 976nm with an electrical to optical efficiency greater than 44% and a 92% power enclosure at 0.12NA at the rated output power. By using Volume Bragg Gratings to narrow and stabilize wavelength, we got 976 /-0.5nm high power and high brightness pump lasers. With the similar structure, 150W/120W output powers with fiber 105μm NA0.22/0.15 at 915nm were also achieved separately, and the electrical-to-optical power conversion efficiency (PCE) was 48%.