The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	External cavity laser power stabilizer
Author:	Ding, Jie
View Online:	njit-etd1994-078 (ix, 54 pages ~ 1.7 MB pdf)
Department:	Department of Physics
Degree:	Master of Science
Program:	Applied Physics
Document Type:	Thesis
Advisory Committee:	Hensel, John Charles (Committee chair) Chin, Ken K. (Committee member) Yan, Yuan (Committee member)
Date:	1994-01
Keywords:	Frequency stability. Lasers. Crystal optics.
Availability:	Unrestricted
Abstract:	In this thesis, we want to design a stabilizer which does not depend on laser source--with external cavity. In the first part of the thesis ( Chapter 2 and 3 ), we discuss the wave propagation in crystals and the modulation of optical radiation. From the main two types electro-optic modulations, Phase Modulation and Transverse Modulation, we know that the transverse modulation shows an increase in the frequency limit or useful crystal length of (1-c0/ncm)-1, and we will use this type modulation in this thesis. The second part of the thesis is the procedure of design and experiment. Because we used an electrooptic modulator which characteristic is L/d = 3, its halfwave voltage is 1200V, we have to find an amplifier circuit which can output high voltage as feedback signal to control the electrooptic modulator. We tried two types power transistors, and finally got the output voltage of -500v--±500v. To compare the output power intensity of the stabilizer with the input power intensity, we can find that the power stability is increased by 50 times.