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Passive Q-Switching by Cr
Gabriela Croitoru Salamu1, Nicolaie Pavel2
1Laboratory of Solid-State Quantum Electronics, National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Ilfov, Romania. gabriela.croitoru@inflpr.ro.
Materials (Basel, Switzerland)
|September 15, 2018
Summary
Femtosecond laser direct writing created buried waveguides in Nd:YAG and Nd:YVO₄ for Q-switched lasers. These compact systems achieve moderate pulse energies at high repetition rates, demonstrating potential for efficient laser development.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Development of compact, high-performance laser systems is crucial for various applications.
- Waveguide lasers offer advantages in terms of beam quality and efficiency.
- Femtosecond laser direct writing is an advanced technique for fabricating optical components.
Purpose of the Study:
- To investigate laser performances in Q-switched mode using buried depressed-cladding waveguides.
- To evaluate the potential of femtosecond laser direct writing for creating efficient Nd:YAG and Nd:YVO₄ lasers.
- To compare Q-switched and continuous-wave (CW) operation characteristics of these waveguide lasers.
Main Methods:
- Fabrication of circular buried depressed-cladding waveguides in Nd:YAG and Nd:YVO₄ using femtosecond laser direct writing.
- Q-switched laser operation utilizing a Cr⁴⁺:YAG saturable absorber.
- Characterization of laser output power, pulse energy, repetition rate, and peak power.
- Assessment of continuous-wave (CW) laser performance and optical-to-optical efficiency.
Main Results:
- Q-switched operation in Nd:YAG waveguide yielded 0.52 W average power, 7.79 μJ pulse energy at 67 kHz, and 1.95 kW peak power.
- Nd:YVO₄ waveguide achieved 0.77 W average power, 9.4 μJ pulse energy at 83 kHz, and 1.36 kW peak power in Q-switched mode.
- Continuous-wave operation demonstrated up to 1.85 W output power with optical efficiencies of 0.21 (Nd:YAG) and 0.26 (Nd:YVO₄).
Conclusions:
- Femtosecond laser direct writing enables the fabrication of efficient buried waveguide lasers.
- These lasers are suitable for generating high peak power pulses at high repetition rates.
- The developed compact laser systems pumped by fiber-coupled diode lasers show significant potential for practical applications.
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