Theoretical study for neodymium-doped optical fiber laser

Other Title(s)

دراسة نظرية لليزر الليف البصري المطعم بالنديميوم

Dissertant

Salman, Amjad Abd al-Hamid

Thesis advisor

Ahmad, Mazhar Shihab

Comitee Members

Atwan, Ahmad Farhan
Hasan, Husayn S.
Hasan, Ala Badr

University

University of Baghdad

Faculty

College of Education for Puresciences-IBN al-Haitham

Department

Department of Physics

University Country

Iraq

Degree

Master

Degree Date

2016

English Abstract

The current study included firstly the analytical solution of rate equations for optical fiber laser, that is process according to pump plan with four-levels system to find equation of lasing output power (Pout) by using the numerical emulation Secondly, calculating the (Pout) of Nd+3-doped optical fiber laser as a typical example for the optical fiber laser, which is process according to this system.

The required equations to calculate (Pout) was programmed by Matlab program (version8.1).

Two types of hosts were used in this simulation, the first type is Silica with four designs using commonly in the above mentioned, the four designs are Lycom (a), Lycom (b), York and IVA with lasing emission at the wavelengths (1064×10-9m) and (1331×10-9m).

The second type of hosts is ZBLAN with only one design is Le Verre fluore, with lasing emission at two wavelengths (1048×10-9m) and (1317×10-9m).

The first step in this emulation was determining the value of numerical aperture (NA) for each design of special designs and at the special wavelengths for every host, which can obtain the highest values of lasing output power (Pout) and efficiency (η) at value of (NA).The second step was calculating the (Pout) corresponding to pump power (Po) for each host according to the designs and the wavelengths related to the host, In case of the host Silica, for the two wavelengths of this host, it is found that the (Pout) was the highest value when the design (York) was used, while in case of the host (ZBLAN), it is found the highest value of (Pout) is when using the wavelength (1048×10-9m).

For addition that, it is found that to obtain the highest values of (Pout) and (η) for this type of laser, it must be use the host Silica at the wavelength (1048×10-9m).

According to that, the third step was using this host and this wavelength to calculate the effect of the numerical aperture (NA), core radius (a), cladding radius (b), fiber length (L),reflection coefficients (R2), Nd+3- dopant concentration in the core (No), lifetime of upper laser level (T2) and pump power (Po) on the (Pout).

The changing of the above mentioned coefficients values was determinate with its range which is finding in four designs related to the host Silica.

It is found that the value of (Pout) decreased with the increase of the values of (NA, a, b, L and No), while increase with the increase of the values of (R2 ,T2 and Po), through that, the optimal values of these coefficients which must be used to obtain the highest values of (Pout) and (η) for this type of laser.

Main Subjects

Physics

No. of Pages

114

Table of Contents

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Language

English

Data Type

Arab Theses

Record ID

BIM-737720