Categories
Misc

Prof. Robert Byer’s visit

Prof. Robert Byer had a seminar at MPI für Quantenoptik, titled Acceleration of Electrons with Visible Light. I went over and listened his nice talk, but I have nothing special to comment. It is a touch project, and power consuming as well 😉 if successfully built. The current power supply of SLAC is not enough according to estimation.

After that he visited our lab. We talked about topics like nonlinear optical crystals, especially their VTE PPSLT, long wavelength Yb fiber laser and amplifier, and yellow lasers, etc. He has very broad expertise, ranging from nonlinear crystals to gravitational wave detection to electronic acceleratoration. The meeting is interesting and fruitful.

But there is always a serious problem for me in such events: I can hardly join the discussings. I still don’t master English well and the rythem of his speech is quite fast. So I should practise my English more. This is actually one purpose of this blog.

Categories
Works

3 W orange laser based on fiber Raman laser

We obtained 1.1 W 589nm orange laser yesterday by an approach of fiber Raman amplifier and external frequency doubling. It is only a brief test, so we are rather confidence to scale the power to over 2W in next tryments. The laser is linear polarized and the linewidth is below 2GHz, which is good for laser guide star application. Compared to what I had done one and half years ago, it is a big improvement.

1 W level compact orange laser has big market already. We are thinking of the potential to scale up to >10W. The only obstacle seems to be the nonlinear crystal.

19/08/05 update: I was too optimistic. We could get up to 1.6W only. Many problem with the crystals.

23/08/05 update: We get 2.9W now, with efficiency ~23%.