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Pr:YLF, intracavity-pumped, room-temperature upconversion laser.

P W Binun, T L Boyd, M A Pessot

|November 3, 2009

Summary

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This study demonstrates room-temperature upconversion laser operation in Pr:YLF at 640 and 607 nm. An intracavity-pumping scheme achieved 3.5 mW output power at 607 nm using a Yb:YAG laser.

Area of Science:

Laser Physics
Quantum Optics
Materials Science

Background:

Upconversion lasers are crucial for generating visible light from infrared sources.
Praseodymium-doped YLF (Pr:YLF) crystals are promising for upconversion applications.
Efficient room-temperature operation remains a challenge for many upconversion systems.

Purpose of the Study:

To achieve continuous-wave (CW) room-temperature upconversion laser operation in Pr:YLF.
To investigate an intracavity-pumping scheme for efficient population of upper laser levels.
To characterize the output power and wavelengths of the upconversion laser.

Main Methods:

Utilized an intracavity-pumping scheme with a Ytterbium-doped Yttrium Aluminum Garnet (Yb:YAG) laser at 1030 nm.

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Pumped the weak ground-state transition (3H4 → 1G4) of Pr:YLF to populate an intermediate metastable level.

Employed excited-state absorption at 867 nm to populate the (3P0) and (3P1) upper laser states.

Main Results:

Achieved CW room-temperature upconversion laser operation in Pr:YLF.
Observed laser emission at 640 nm and 607 nm.
Obtained an average output power of 3.5 mW at 607 nm with a combined input pump power of 2.5 W.

Conclusions:

Demonstrated the feasibility of CW room-temperature upconversion lasing in Pr:YLF using the described pumping scheme.
The results highlight the potential of Pr:YLF for visible light generation via upconversion.
Further optimization could lead to higher output powers for practical applications.