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Works

Updates

It is the end of year again. I feel obligated to update this blog after a long hiatus. I have been busy as most of the men on the Chinese land do. I don’t have much time to blog, but I do spend some time on setting up a simple website for the research group and updating the new publications. The website has a nice domain name “laser.im“.

I wish to continue the guide star laser work. Therefore, we have researched ways to generate linearly polarized Yb doped fiber laser, and are now able to build 100 W class linearly polarized 1120 nm Yb-doped fiber laser with cross-axis-matched FBG pairs written in polarization maintaining fiber. We improved the SBS suppression technique further, and achieved a 44 W single frequency Raman fiber amplifier at 1178 nm with an optical efficiency of 52 %. Up to 25 W at 589 nm has been demonstrated with a home-built frequency doubling cavity, which is not yet optimized.

I feel mode locking of fiber laser fascinating, therefore, we have studied mode locking of Raman fiber laser with graphene absorber. The idea is simple: To achieve wavelength versatile mode locked fiber laser by combining the shared advantage of Raman gain and graphene saturable absorption, both of which is broadband. During the path, we have demonstrated passively Q-switched Yb-doped fiber laser by graphene, and the use of single-multi-single mode fiber structure as bandpass filter for building all fiber tunable dissipative soliton fiber laser.

The SBS suppression technique was applied to single frequency Yb doped fiber laser, and achieved 170 W linearly polarized laser with a 10 micron core PM fiber by 7 time increase of SBS threshold. We also find Yb doped fiber laser at the wing of gain spectrum interesting. One example is a demonstration of high power single frequency 1014.8 nm fiber amplifier working at room temperature for mercury cooling after frequency quadruplication. These works are not yet published.

The research works are on-going. Future update will be posted on the new group website.

Categories
Misc

2010 CLEO/Laser Focus World Innovation Award, Honorable Mention

The 2010 CLEO/Laser Focus World Innovation Award went to NTT Advanced Technology Corporation. TOPTICA received a honorable mention.

TOPTICA Photonics AG – Booth 1321

High-Power Tunable Laser Source for Sodium Spectroscopy and Other Applications

For the creation of a tunable, narrow-linewidth, high-power (30 W), 589 nm yellow laser for guide star, spectroscopy, LIDAR, phototherapy, and other visible and near-IR applications.

What is CLEO/Laser Focus World Innovation Award?

Each year, the CLEO/Laser Focus World Innovation Awards Program honors the most timely, ground-breaking products in the field of laser science. Designed to showcase some of the most significant new products in the field, Innovation Award entries are evaluated on criteria critical to product success: impact, functionality, life expectancy, effect on the optics industry, innovation and patents or trademarks.

I am pleased and proud because I contributed significantly to the development of the technology behind this product.