On The Application of CLiPS Materials To Laser Diodes Author: - PowerPoint PPT Presentation

On The Application of CLiPS Materials To Laser Diodes Author: Christopher Reed Supervisor: Dr. Mike Crescimanno Youngstown State University February 28, 2012 Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Outline Introduction Experiment Theory Simulation Applications Conclusion Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Introduction What are CLiPS? What happens when a CLiPS film is applied to a laser diode? Spectra Lasing Threshold Linewidth Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Picture of CLiPS Material and Laser Diode Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Outline Introduction Experiment Theory Simulation Applications Conclusion Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Spectra CLiPS Changes the Wavelength Moving the CLiPS Around Also Changes the Wavelength Sometimes the Wavelength Did Not Change Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Experimental Setup For Spectra and Lasing Threshold Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes Figure: Experimental Setup for Spectroscopy and Lasing Threshold

Picture of Spectra Figure: Specra with and without CLiPS Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Lasing Threshold Lases Earlier and with Less Current Laser is Now Less Efficient Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Picture of Lasing Treshold Figure: Lasing Threshold with and without CLiPS Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Experimental Setup of Fabry-Perot Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Picture of Linewidth Figure: Fabry-Perot measurement of the linewidth with and without CLiPS Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Linewidth Need to Maintain Spectral Purity Used a Fabry-Perot Interferometer Inconclusive Data (Linewidth Didn’t Change) Too Much Transverse-K Linewidth Didn’t Get Any Worse Linewidth Should Actually Get Better Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Outline Introduction Experiment Theory Simulation Applications Conclusion Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Theory Why Did These Things Happen? Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Spectra Wavelength Is Determined By a Variety of Factors Type of Gain Medium Length of Laser Cavity Reflectivity of Mirrors ν = mc / 2 d Phase Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Lasing Threshold More Light In the Laser Cavity Population Inversion Happens Sooner Less Current is Required Q factor increases Q = ν ℓ Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Linewidth Heisenberg’s Uncertainty Principle for Time and Energy ∆ E ∆ t ≥ � / 2 Inconclusive Data Some Reasons Why Residual CLiPS Material on Ouput Coupler Beam Quality Too Poor Too Much Transverse-K Laser Still Spectrally Pure Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Residual CLiPS Material on Ouput Coupler THV Has a Higher Thermal Expansion Than San25 Causes Too Much Transverse-K Destroys Beam Quality Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Picture of Linewidth Figure: Fabry-Perot measurement of the linewidth with and without CLiPS Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % 83 . 3 X 10 − 6 % Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % 83 . 3 X 10 − 6 % 83 . 3 X 10 − 6 % = αδ T Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % 83 . 3 X 10 − 6 % 83 . 3 X 10 − 6 % = αδ T Mike Aviles Says That α = 3 . 2 X 10 − 4 / ◦ K Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % 83 . 3 X 10 − 6 % 83 . 3 X 10 − 6 % = αδ T Mike Aviles Says That α = 3 . 2 X 10 − 4 / ◦ K ∆ T = . 3 ◦ K Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % 83 . 3 X 10 − 6 % 83 . 3 X 10 − 6 % = αδ T Mike Aviles Says That α = 3 . 2 X 10 − 4 / ◦ K ∆ T = . 3 ◦ K 80 Fringes! Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Thermal Effects Can the Change in the Number of Fringes Be Explained By Thermal Effects? 8.3 Fringes Corresponds To a Change of 8 . 7 X 10 − 6 % 10.7 Fringes Corresponds To a Change of 11 . 2 X 10 − 6 % 83 . 3 X 10 − 6 % 83 . 3 X 10 − 6 % = αδ T Mike Aviles Says That α = 3 . 2 X 10 − 4 / ◦ K ∆ T = . 3 ◦ K 80 Fringes! Our Theory Doesn’t Work Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Outline Introduction Experiment Theory Simulation Applications Conclusion Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Simulation Built in C Most of the Code (CLiPS Section) Built By Dr. Crescimanno I Worked On Laser Cavity Section Results of Simulation Tell Us How Accurate Our Theory Is Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Theory Laser Cavity Section Built With Three Matrices Back Mirror (Essentially No Light Gets Through) Laser Cavity With Gain Medium Output Coupler Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Mirrors � − 1 � r 1 Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Mirrors � − 1 � r 1 � 1 � t 1 Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Mirrors � − 1 � r 1 � 1 � t 1 � 1 � r ′ 1 Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Mirrors � − 1 � r 1 � 1 � t 1 � 1 � r ′ 1 � − 1 � t ′ 1 Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes

Mirrors Back Mirror Call a Matrix M: � a � b M = c d Author: Christopher Reed Supervisor: Dr. Mike Crescimanno On The Application of CLiPS Materials To Laser Diodes