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Single-frequency 1.25 W monolithic lasers at 1123 nm
Er Jun Zang1, Jian Ping Cao, Ye Li
1Division of Electricity and Quantum Metrology, National Institute of Metrology, 18 Beisanhuan East Road, Beijing 100013, China.
Optics Letters
|January 12, 2007
Summary
Researchers achieved stable, single-frequency 1123 nm laser output from a neodymium-doped yttrium aluminum garnet (Nd:YAG) monolithic nonplanar ring laser. This development successfully suppressed unwanted 1064 nm radiation, enabling new applications.
Area of Science:
- Laser Physics
- Quantum Optics
- Materials Science
Background:
- Neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers are crucial for various applications.
- Monolithic nonplanar ring lasers (MNPLs) offer advantages in stability and single-frequency operation.
- Operating Nd:YAG lasers at 1123 nm presents challenges due to competition from stronger transitions like 1064 nm.
Purpose of the Study:
- To experimentally investigate Nd:YAG monolithic nonplanar ring lasers operating at 1123 nm.
- To achieve stable, single-frequency output at 1123 nm while suppressing the 1064 nm emission.
- To characterize the performance, including output power, efficiency, and frequency tuning capabilities.
Main Methods:
- Utilized a monolithic nonplanar ring cavity design with Nd:YAG as the gain medium.
- Employed an 808 nm diode laser for pumping.
- Implemented techniques to suppress the dominant 1064 nm laser transition.
- Measured output power, slope efficiency, and frequency tuning characteristics.
Main Results:
- Achieved stable single-frequency 1123 nm laser output.
- Successfully suppressed the strong 1064 nm radiation.
- Demonstrated a single-frequency output power of 1.25 W with a slope efficiency of 39% for 3.98 W pump power.
- Observed a laser frequency tuning range exceeding 3 GHz with a tuning rate of -2.6 GHz/°C.
- Confirmed that a strong iodine absorption line falls within the laser's tuning range.
Conclusions:
- Stable single-frequency 1123 nm operation of Nd:YAG MNPLs is feasible.
- Suppression of the 1064 nm line is critical for achieving 1123 nm output.
- The demonstrated performance metrics indicate potential for applications requiring precise wavelength control, such as spectroscopy.
