High Q and Low Threshold WGM Lasing in the Visible Spectral Range from SM:ZNO Micro-spherical Cavities
Technology Category/Market
Technology: A Multimodal 3-degrees of Freedom Haptic Device
Category: Assistive, Test Equipment & Design Manufacturing/Robotics & Automation
Industry: Biomedical/Gaming/Automotive
Application: Haptic sensation /Remote environment
Market: The global market size is estimated to be worth USD 3.9 billion in 2022 and is projected to reach USD 5.0 billion by 2028, at a CAGR of 3.7% during the forecast period.
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Problem Statement
- ZnO is ideal for solid-state light sources and detectors, especially in UV ranges due to its wide bandgap and large free-exciton binding energy.
- ZnO-based micro-resonators are suitable for UV micro-lasers due to their stable emission layer and good optical confinement.
- ZnO can be easily made into various nano– and micro-structures, with spherical dielectric structures having no confinement loss at the edges.
- ZnO emits a wide spectrum in the visible range, but there is limited research on visible range WGM lasing in ZnO.
- Researchers have developed an improved process for high Q and low threshold WGM lasing in the visible spectral range from Sm:ZnO micro-spherical cavities.
Technology
- Synthesizing spheres from Sm:ZnO micro-spherical cavities using simple laser ablation.
- Creating undoped and 1% Sm:ZnO microspheres using a Q-switched Nd:YAG laser beam.
- Collecting liquid droplets formed as spheres on quartz substrates.
- Making targets from nanoparticle powder synthesized by sol-gel route, cold pressed, and sintered at 1100°C for 12 hours.
- Coupling major Sm3+ f-f emissions from transitions from 4G5/2 to its low-lying multiplets.
- Doping ZnO with Sm ion to form 4f levels in the forbidden gap of ZnO.
- Coupling sharp emissions from inter-band states and characteristic ZnO emissions to WGMs of the cavity.
Key Features/Value Proposition
Whispering Gallery Mode Lasing in Sm³⁺doped ZnO Microspheres
- Characterized by selective, sharp resonances.
- Enables efficient lasing with precise spectral output in visible range.
- Applicable for displays, optical sensors, lighting.
Low Lasing Threshold and High Q-value Laser Technology
- Achieves low lasing thresholds.
- Enhances efficiency
- High Q-values improve resonance sharpness and stability.
Laser Ablation Synthesis of Microspheres
- Fabricates Sm³⁺doped ZnO microspheres.
- Ensures high crystallinity, smooth surfaces, and scalable production.
- Compares to complex CVD or sol-gel processes.
ZnO Matrix Emissions: Sharp Emissions from Sm³⁺ Transitions
- Sm³⁺ ions produce well-defined emissions.
- Transitions in 4f electron levels ideal for visible light emission.
- Highly efficient for visible wavelength applications.
Laser Ablation Technique:
- Cost-Effective, Scalable
- Simpler, cheaper, scalable alternative to traditional methods.
- Avoids complex, costly CVD and sol-gel processes.
Invention Enhances Efficiency with Low Thresholds”
- Operates with low lasing thresholds.
- High Q-values reduce energy consumption.
- Reduces energy consumption compared to conventional technologies.
Sm³⁺ Transitions Lasing Emissions
- Crucial for precision applications like optical sensing and lighting.
Technology Versatility:
- Tailored for visible wavelength emissions (550–750 nm).
- Offers advantages for advanced displays, sensors, lighting systems.
Laser Ablation Synthesized Microspheres
- Result in efficient light generation and propagation.
Questions about this Technology?
Contact for Licensing
Research Lab
Prof. Ramachandra Rao M S
Department of Physics
Intellectual Property
IITM IDF Ref. 1753
Patent No: IN 548715
Technology Readiness Level
TRL- 4
Technology validated in lab