Switchable and tunable single-longitudinal-mode dual-wavelength Ho:YLF laser based on different wavelength...

Area of Science:

• Laser Physics
• Quantum Optics
• Materials Science

Background:

• Holmium-doped Yttrium Lithium Fluoride (Ho:YLF) lasers are crucial for various applications, including mid-infrared spectroscopy and medical treatments.
• Achieving stable single- and dual-wavelength operation in Ho:YLF lasers is essential for advanced laser systems.

Purpose of the Study:

• To demonstrate a switchable and tunable Ho:YLF laser capable of operating in both single- and dual-wavelength single-longitudinal-mode regimes.
• To investigate the tunability and switching mechanisms for different wavelength combinations.

Main Methods:

• Utilized uncoated and coated quartz etalons to suppress multi-longitudinal modes.
• Employed a thin film polarizer (TFP) rotated perpendicular to the optical axis to switch between single- and dual-wavelength emissions.
• Characterized output power, wavelength stability, beam quality (M²), and power stability.

Main Results:

• Achieved maximum single-longitudinal-mode output power of 360 mW at 2063.10 nm.
• Successfully switched between single-wavelength (2050 nm, 2064 nm) and dual-wavelength emissions (combinations within and across bands) by rotating the TFP angle (-13.4° to 17.7°).
• Measured beam quality M² of 1.34 and power stability of 1.77%.

Conclusions:

• Demonstrated a versatile Ho:YLF laser with switchable and tunable single- and dual-wavelength capabilities.
• The developed laser system offers precise wavelength control for potential applications in spectroscopy, sensing, and medical fields.
• The use of etalons and TFP provides an effective method for mode control and wavelength selection in Ho:YLF lasers.