White Laser Based on Quasi-Phase-Matched Periodically-Poled Lithium Tantalate
Date Issued
2009
Date
2009
Author(s)
Lai, Ying-Yao
Abstract
This thesis is composed of three parts：(1) the theory of quasi-phase- matching(QPM) and the QPM optical parametric oscillator(OPO), (2) the fabrication technique of one-dimensional periodically poled congruent grown lithium tantalite(LiTaO3) for constructing a 532nm laser pumped optical parametric oscillator, (3) Demonstration of optical parametric red, blue, white light generators and the characteristics analysis of them.irst of all, the mechanism of nonlinear optical generation will be introduced and then the theory of QPM and OPO will be explained. We applied the Sellmeier equation of LiTaO3 to design the QPM periods of PPLT for making the OPO chips. In the second part, the fabrication technique of PPCLT will be discussed. Furthermore, methods to improve the nickel-diffusion assisted electric poling process will be addressed. These technique allow the realization of domain period of 11.6um、7.9um respectively, for making optical parametric red blue light generators on PPLT of 20mm length, 0.5mm thickness. We finally applied two periodic domains in tandem in a single LiTaO3 crystal to facilitate cascaded QPM parametric process to current green input lasers to white light lasers. s an example, QPM-OPO chips that is able to current 532nm green input to generate singles waves 630nm、870nm simultaneously. By placing a 25mm-length PPLT chip inside a compact laser cavity of 30mm length, this compact design offers the generation of red light 19mW at 630nm, blue light 27mW at 435nm when pumped by a 20ns width green laser of 450mW. By doing so, an average output power of 76mW white light laser has been achieved under a 450mW input green pump, which corresponds to a conversion efficiency of 16.8 %.
Subjects
White Laser
Quasi-Phase-Matched
Periodically-Poled Lithium Tantalate
Optical parametric oscillator
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96941101-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):4a92aa41ca3fc7b6a47ddf0a30b45b44