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2011.04.22 Academic report:Blue-green laser source applied to the new projection display

Title: Blue-green laser source applied to the new projection display
Speaker: li kang, Doctor , Glamorgan University of UK
Time: April 22, 2011 9:30 am
Location: Transient Building, third floor conference room
Outline of the Content :
To date, several platforms have been developed for generation of compact, high-brightness, high-efficiency blue laser. For the first technology, frequency doubling of diode pumped solid state laser (DPSS) with Nd:YVO4 lasing at 914 nm and Nd:YAG lasing at 946 nm are perhaps the most widely used commercial solid state blue lasers. Mitsubishi engineers improved this platform using an unusual planar-waveguide configuration for both replacing the fundamental and second-harmonic bulk crystal for green light generation. Likewise, DPSS using waveguides of Nd:YVO4 and Nd:YAG can be used for blue laser generation at 457 nm and 473 nm with suitable SHG crystal, respectively. 
In order to improve the efficiency and compactness of the blue laser, it is necessary to replace the solid-state gain medium in DPSS system by directly using a GaAs/GaAlAs/InGaAs based diode laser and doubling it to blue. The second platform is based on this idea. Novalux Inc. engineers demonstrated platform for 460 nm laser based on the ICFD of a diode surface-emitting laser (NECSEL). Multi-watt blue laser was considered by many to be the leading candidate for televisions and other displays. High power narrow bandwidth edge-emitting diode lasers (EEDL) directly used for SHG generation attached many scientists attention recently. External cavity diode lasers (ECDL), laser diode based on master oscillator power amplifier (MOPA) systems, and distributed Bragg reflector (DBR) tapered lasers have been reported for the single pass SHG blue light generation. Recently, ICFD based on a bulk-type QPM SHG in a MgO:PPLN crystal has been reported without diode laser facet degradation or damage for 33 mW blue and 1.3 W green light generation.
In this work we show a compact blue laser by ICFD based on a bulk-type QPM SHG in a MgO:PPLN crystal. Multi-emitters high performance laser bar is used as the pump laser. 1.2 W blue lights at 465 nm is generated at 45 A injection current. No diode laser facet degradation or damage is observed during 2 hours stability test of blue laser output power.

Profile of the report
Kang Li received his BSc and PhD degrees from Changchun University of Science and Technology and State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (CAS), respectively, in 2002 and 2007. He is Member of Optical Society of America (OSA) and MInstP/Member of IoP – Institute of Physics. 
From July 2007 to July 2009, he did research as Postdoctal Research Assistant in Institute of Advanced Telecommunications, Swansea University, United Kingdom, working in £5m European Regional Development Fund (ERDF) project of Investigated and analyzed the achievable Four Wave Mixing (FWM) efficiency within the polarization insensitive SOA-based wavelength conversion scheme.
From January 2009 to Date, he did research as Research Fellow in Integrated Communications Research Centre, Faculty of Advanced Technology, Glamorgan University, United Kingdom, working in £2.5m Carbon Trust project of Theoretical and Experimental Research in New Robust OLED Lighting, and £2m UK DTI project of High Efficiency Laser Projection.




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