Development of visible up conversion fiber laser based on modified silica glass host
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Development of visible up-conversion fiber laser based on modified Silica glass host. Project Update for Brain-Gain Malaysia Program Panel Site Visit By Hairul A. Abdul Rashid, Ph.D MMU 22 nd December, 2010. Contents. Introduction Physical Progress Financial Progress

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Development of visible up conversion fiber laser based on modified silica glass host

Development of visible up-conversion fiber laser based on modified Silica glass host

Project Update for

Brain-Gain Malaysia Program

Panel Site Visit

By Hairul A. Abdul Rashid, Ph.D

MMU

22nd December, 2010

.


Contents
Contents

  • Introduction

  • Physical Progress

  • Financial Progress

  • Corrective Actions

  • Requests


Introduction
Introduction

  • Design, Fabricate and Characterize:

    • Visible wavelength

    • Fiber laser

    • Modified Silica Host

  • Under guidance of visiting scientist:

    • Dr. Mukul Chandra Paul, CGCRI, India

  • Collaboration:

    • TM R&D


Methodology
Methodology

  • Development

    • Preform fabrication

    • Fiber drawing

    • Fiber laser setup

  • Characterization

    • Fiber dimensions

    • Emission/ Lasing properties


Fiber design
Fiber Design

  • Core composition: SiO2+Al2O3+Yb2O3+Pr2O3+ZrO2/Y2O3+F

  • Core diameter: 25μm

  • Inner cladding diameter: 200μm

  • Coating dia: 400±25μm

  • Core NA: 0.12

  • Cladding NA: 0.45 - 0.49

  • Pr and Yb doping level: 1.0 - 1.5 wt%


Updates
Updates

  • Preform Fabrication

    • MCVD is ready to run deposition

    • Not fully sintered

    • Recipe need to modify

    • Solution doping - doping of Pr3+ and Yb3+ into alumino-silicate glass modified with incorporation of ZrO2 and PbF2 or F of optical fibre preform.

    • Solution doping station:

      • Design complete

      • motor and pump ready

      • Preparing tubing


Set up for solution doping
Set Up For Solution Doping

Peristaltic Pump Motor

Fabricated porous soot

Drain Valve

Dopant Solution


Updates

  • Fiber drawing

    • Milling of the preform into D-shaped inner cladding structure

    • Polishing

    • Resin coating for outer cladding

    • Fiber drawing

    • Drawing tower in UM is not ready (expected February 2011)

    • Fiber drawing will be done in CGCRI

    • Quotation ready


Updates

  • Fiber Laser setup

    • Lasing wavelength range:- Visible range (400-800nm)

    • Output Power range:- 0.01-0.1W

    • Pump configuration with other parameters:- Wavelength (800nm or 980 nm), Pump Power (1000mW)


Characterization progress
Characterization Progress

Schematic diagram of visible wavelength Pr3+ Doped fiber laser setup

There will be three types of pump wavelength to be proposed for this project :

1064nm

800nm

980nm


Multimode laser diode
Multimode laser diode

Uncooled High Power Laser Diode

Max Power (10W)

High Power Laser Diode Driver (Controller)

High Power Laser Detector


Laser diode characteristics
Laser Diode Characteristics

Bookham 980nm Laser Diode Charactereristics at typical operating current (extrapolated)

Bookham 980nm Laser Diode Charactereristics near threshold current


Updates

  • Characterization

    • Material study of Pr doped modified silica based glass structure using EPMA, SEM-EDX, XRD and TEM analyses

    • To be done in CGCRI

    • Quotation ready


Updates

  • Characterization

  • Geometrical and optical property of the fabricated fibres will be done through measurement of core diameter, inner cladding diameter, coating thickness and RI profile using Fibre Analyser along with optical loss by the spectral attenuation set-up.

  • Setup is ready


  • Physical progress
    Physical Progress

    • Original Gantt Chart

    • Milestone #1

      • Complete fabrication

      • June 2010

      • Not achieved (yet)


    Reasons
    Reasons

    • Milestone #1 not achieved

    • Dr. Mukul was involved in some industrial accident.

    • Currently recovering and undergoing physiotherapy

    • Late disbursement, October 2010


    Corrective actions
    Corrective Actions

    • Necessary equipment and raw materials for fabrication is ready

    • Dr. Mukul’s trip to Malaysia in January 2011

    • Hairul to visit Dr. Mukul (private)

    • In the mean time, our team is running several runs in the MCVD through his guidance over email.

    • Start earlier on other project activities: characterization


    Physical progress1
    Physical Progress

    • Revised Gantt Chart

    • Revised Milestone

      • Milestone #1: March 2011

      • Milestone #2: May 2011

      • Milestone #3: August 2011


    Request
    Request

    • Extension: 31st August, 2011

    • Fiber drawing and characterization will be done in CGCRI

    • Team to visit CGCRI in March 2011

    • Use existing budget since Dr. Mukul can spend only 2 months maximum


    Financial progress
    Financial Progress

    • Approved Project Allocation : RM_312,100_

    • Year 1 ( 2010 ) : RM_246,600__

    • Total Allocation Received To date : RM_246,600_

    • Total Expenditure To date: RM_ 140,852.45 __or _57.12__%

    • Balance of Allocation To date : RM_ 105,747.55



    Background

    www.physics.unlv.edu/facilities.html

    Background

    • Visible laser light sources

      • Spectroscopy

      • Printing technology

      • Medical applications

        www.physics.unlv.edu/facilities.html


    Background1
    Background

    • Currently

      • air cooled ion lasers

      • frequency doubled solid-state lasers

    • Problem

      • high power consumption

      • complicated nonlinear parametrical processes

    • Up-conversion fiber lasers operating directly in the visible spectral range offer a simple alternative


    Advantages
    Advantages

    • phases of the incident light = phase up-conversion light, not required

    • Lower cost, mature semiconductor laser as pump

    • Glass hosts as wave guides

      • increases the optical gain length

      • decreases the pumped power by the optical restriction effect

      • beam quality


    Problem definition
    Problem Definition

    • Up-conversion lasers based on glass fibers

      • high pump intensities over long lengths

      • laser threshold

    • silica glass unsuitable due to high phonon energies

      • cause strong multi-phonon transitions

      • lead to too short metastable level lifetimes.


    Problem definition1
    Problem Definition

    • Alternatively, heavy-metal fluoride glasses (e.g. ZBLAN)

      • tends to be fragile and expensive


    Solution
    Solution

    • fabricate compact, mass-producible, high-power up-conversion visible wavelength fiber lasers

    • employs cheap, readily available IR semiconductor lasers

    • research required to identify suitable materials for host


    Solution1
    Solution

    • Use Praseodymium (Pr) with Ytterbium (Yb) as a co-dopant

      • Emission occurs at multiple visible wavelengths including blue/green, green and red

      • Previous proof of high efficiency upconversion lasing in ZBLAN optical fibres

      • Use of a single wavelength pumping source when co-doped with Ytterbium (Yb).

      • The apparent lack of a photodarkening mechanism.


    Modified host
    Modified Host

    • Fluoride and Tellurite hosts offer better quantum efficiencies – however properties are problematic, non-practical device.

    • Doping silica materials with Pr3+ or Yb3++Pr3+

      • low fluorescence

      • high phonon quenching

    • Need for modified silica host


    Objectives
    Objectives

    • Development of Pr3+ and Yb3++Pr3+ co-doped modified silica based glass host containing around 80-85mol% of SiO2 for use as cladding pump visible up-conversion fibre laser in blue, green and red regions.


    Objectives1
    Objectives

    • Optimization of the core composition of Pr3+ and Yb3+ doped silica glass based optical fibres to improve their lasing property from view point of material study and fibre design.


    Objectives2
    Objectives

    • Standardization of different process parameters during fabrication of preform, milling followed by polishing in the D shaped inner cladding structure and fibre drawing stage to get desired waveguide parameters of the fibres .


    Objectives3
    Objectives

    • Spectroscopy study of RE dope nano-crystallite fibre.

    • Evolution of the lasing property of the fabricated Pr3+ and Pr+Yb codoped cladding pump fibres.


    Visiting scientist
    Visiting Scientist

    • DR. MUKUL CHANDRA PAUL

    • Optical Communication Fiber Laboratory

    • Central Glass & Ceramic Research Institute

    • Expertise - Fiber Optics, Material Science

    • CV attached



    Methodology1
    Methodology

    • Development

      • Fabrication

      • Fiber Laser setup

    • Characterization

      • Fiber dimensions

      • Lasing properties


    Proposed fiber a
    Proposed fiber A

    • Core composition: SiO2+Al2O3+Yb2O3+Pr2O3+ZrO2/Y2O3+F

    • Core Dia:- 20-25 micron

    • Inner cladding dia:- 200μm

    • Coating dia: 400±25μm

    • Core NA:- 0.12 ±0.01

    • Cladding NA:- 0.45-0.49

    • Pr and Yb doping level:- 1.0- 1.5 wt%


    Proposed fiber b
    Proposed fiber B

    • Core composition:

    • SiO2+Al2O3+Yb2O3+Pr2O3+ZrO2+PbF2


    Project activities
    Project Activities

    • Fabrication

      • Doping of Pr3+ and Yb3+ into alumino-silicate glass modified with incorporation of ZrO2 and PbF2 or F of optical fibrepreform.

      • Milling of the preform into D-shaped inner cladding structure

      • Polishing

      • Drawing of fibre


    Project activities1
    Project Activities

    • Fiber Laser setup

      • Lasing wavelength range:- Visible range (400-800nm)

      • Output Power range:- 0.01-0.1W

      • Pump configuration with other parameters:- Wavelength (800nm or 980 nm), Pump Power (1000mW)


    Project activities2
    Project Activities

    • Characterization

      • Material study of Pr doped modified silica based glass structure using EPMA, SEM-EDX, XRD and TEM analyses

      • Geometrical and optical property of the fabricated fibres will be done through measurement of core diameter, inner cladding diameter , coating thickness and RI profile using FibreAnalyser along with optical loss by the spectral attenuation set-up.


    Characterization

    Pr+Yb codoped D shaped low RI coated fiber

    Characterization

    • Study of lasing property of Pr3+ and Pr3++Yb3+ doped fibers

    • Pumped by 980 nm laser





    Top up project cost
    Top-up Project Cost

    • RO Cost = RM 24,000

    • Cost related to fabrication RM204,300

    • Cost related to characterization RM29,000



    Current facilities
    Current Facilities

    • Photonics Lab, TM R&D

    • Head of Lab, Dr. Abdul Aziz Mat Hassan

    • Fabrication

      • MCVD

      • Quartz Etcher

    • Preform Profiler









    Current facilities1
    Current Facilities

    • Characterization

      • Visible Spectrometer

      • Power Meter (High Power)

      • RF Spectrum Analyzer (Linewidth Measurement)

      • Beam Profiler







    Visit to cgcri kolkata
    Visit to CGCRI, Kolkata

    • Visit on December 2009

    • Discussion with Dr. Mukul Paul, Dr. Badhra

    • Focus on fabrication and characterization of silica fiber

    • Facilities: fabrication (MCVD, drawing tower, solution dopping, UV FBG/ LPG), characterization (preform analyzer, fiber analyzer, optical amplifier characterization)




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