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Upconversion ultraviolet random lasing in Nd3+ doped fluoroindate glass powder
Marcos A S de Oliveira1, Cid B de Araújo, Younes Messaddeq
1Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil.
Optics Express
|March 30, 2011
Summary
This study reports an ultraviolet upconversion random laser (RL) using Nd3+ doped glass powder. The laser utilizes energy transfer between excited ions to emit UV light, achieving a threshold of 30 kW/cm2.
Area of Science:
- Laser Physics
- Materials Science
- Spectroscopy
Background:
- Upconversion processes enable the generation of higher-energy photons from lower-energy excitation.
- Rare-earth doped glasses are promising hosts for laser applications due to their optical properties.
- Random lasers (RLs) offer unique emission characteristics without requiring traditional cavity mirrors.
Purpose of the Study:
- To demonstrate an ultraviolet (UV) upconversion random laser (RL) in Nd3+ doped fluoroindate glass powder.
- To investigate the energy transfer mechanisms responsible for UV emission.
- To characterize the performance of the UV RL, including its threshold and pulse duration.
Main Methods:
- Utilized Nd3+ doped fluoroindate glass powder as the gain medium.
- Employed resonant excitation at 575 nm to populate the Nd3+ 2G7/2 state.
- Analyzed photoluminescence intensity versus pump laser intensity to determine the RL threshold.
- Measured the time duration of RL pulses.
Main Results:
- Achieved an upconversion random laser operating in the ultraviolet (381 nm).
- Observed a random laser threshold of 30 kW/cm2.
- Generated laser pulses with a duration of 29 ns, significantly shorter than the upconversion signal decay time below threshold.
Conclusions:
- Demonstrated the feasibility of UV upconversion random lasing in Nd3+ doped glass powder.
- Confirmed the role of energy transfer between excited Nd3+ ions in the upconversion process.
- Highlighted the potential of this system for applications requiring short-pulse UV light generation.
