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Injection locking of a diode-pumped Nd:YAG laser at 946 nm
Optics Letters
|October 29, 2009
Summary
Injection locking of a quasi-three-level laser system achieved a narrow linewidth of less than 10 Hz. This laser system was then used to excite a strongly forbidden Indium ion (In(+)) transition for a new optical frequency standard.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Laser Physics and Photonics
- Quantum Metrology
Background:
- Quasi-three-level laser systems, such as Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG), present challenges for efficient laser operation due to reabsorption losses.
- Injection locking is a technique used to improve the spectral properties (linewidth, frequency stability) and output power of lasers by synchronizing a slave laser to a master laser.
- Optical frequency standards are crucial for high-precision measurements, timekeeping, and fundamental physics research.
Purpose of the Study:
- To demonstrate injection locking in a quasi-three-level Nd:YAG laser system operating at 946 nm.
- To achieve a narrow laser linewidth and investigate the potential for generating visible and ultraviolet (UV) light.
- To utilize the generated laser light for exciting a specific Indium ion (In(+)) transition for metrological applications.
Main Methods:
- Utilizing laser diodes for pumping both master and slave oscillators in a Nd:YAG quasi-three-level laser system.
- Frequency stabilizing the master oscillator to a high-finesse optical cavity to achieve sub-10 Hz linewidth.
- Implementing intracavity frequency doubling to generate visible light and subsequent frequency quadrupling to produce UV radiation.
Main Results:
- Achieved injection locking in the Nd:YAG laser system at 946 nm with a master oscillator linewidth below 10 Hz.
- Generated a single-mode output power of 60 mW at 473 nm via intracavity frequency doubling.
- Produced 0.55 mW of UV power at 236.5 nm through frequency quadrupling.
Conclusions:
- Successfully demonstrated a highly stabilized, narrow-linewidth laser source based on injection locking of a quasi-three-level Nd:YAG system.
- The generated visible and UV laser outputs are suitable for probing specific atomic transitions.
- The developed laser system shows promise for applications in high-precision spectroscopy and the development of new optical frequency standards, particularly for the strongly forbidden In(+) transition.
