Notes

Outline

Photonic Band Edge Cholesteric Liquid Crystal Laser Presented by: Azriel Genack CTO

What is a Cholesteric Laser? All-in-One Thin Film Device Internal feedback Mirrorless Naturally aligned Emission perpendicular to film Output wavelength set by structure Solid state active medium Self-organized Compact

Advantages of Cholesteric Laser Performance Narrow Line Efficient Low Threshold Broad Area Coherence Longer dye life Improved heat dissipation

Polymeric Cholesteric Laser

Scope of Effort

Lasing in Dye-Doped CLCs

Photonic Band Structure of Layered System

Structure of Cholesteric Liquid Crystals

Photonic Band Structure of Cholesteric System

Computer Simulation of Transmittance

Spatial Distribution of Light Intensity Inside Sample at First Mode

Spatial Distribution of Light Intensity Inside Sample at Second Mode

Transmittance through CLC Film without Absorption or Gain

Transmittance through CLC Film with Gain

Observation of Lasing

Emission and Lasing in CLC

Lasing Output Energy

Spatial Distribution of Emission Experimental Results

Advantages of Cholesteric Laser Performance Narrow Line Efficient Low Threshold Broad Area Coherence Longer dye life Improved heat dissipation

Transmittance through CLC Film  Computer Simulation

Transmittance versus Angle at Frequency of First Mode at High Frequency Band Edge

Spatial Distribution of Laser Emission in Near Field

Spatial Distribution of Laser Emission in Far Field

Universal Relation between Inverse Beam Width and Relative Line Width for Different Samples

Summary Self-organized CLCs liquid or polymeric Act as photonic band gap laser band edge laser Internal feedback low threshold naturally aligned directional mirrorless narrow line wide area efficient heat dissipation low divergence beam tunable emission over entire visible range