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Ho:YLF pumped HBr laser.

L R Botha¹, C Bollig, M J D Esser

¹National Laser Centre, CSIR, Pretoria, South Africa. lrbotha@csir.co.za

|December 10, 2009

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A novel Holmium: Yttrium Lithium Fluoride (Ho:YLF) laser system was developed to generate 4-micron wavelength radiation. This system, utilizing a thulium-doped fiber laser pump, achieved 2.5 mJ of energy output.

Area of Science:

Laser Physics
Molecular Spectroscopy
Quantum Electronics

Background:

Development of efficient mid-infrared laser sources is crucial for various applications.
Molecular lasers offer unique wavelength possibilities but often require complex pumping schemes.

Purpose of the Study:

To develop a fiber-pumped Ho:YLF laser system.
To achieve efficient generation of 4-micron wavelength radiation using a Ho:YLF laser.
To investigate the performance of a hydrogen bromide (HBr) molecular laser pumped by the Ho:YLF laser.

Main Methods:

Fiber pumping of a Ho:YLF laser using a commercial Thulium (Tm) fiber laser.
Injection seeding of the Ho:YLF laser with a narrow-band diode laser locked to HBr transitions for single longitudinal mode operation.

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Development and numerical solution of a rate equation mathematical model to describe HBr laser behavior.

Main Results:

The Ho:YLF laser produced up to 2.5 mJ of energy in the 4-micron wavelength region.
Single longitudinal mode operation of the Ho:YLF laser was achieved via injection seeding.
The developed mathematical model showed good qualitative and quantitative agreement with experimental results.

Conclusions:

A functional fiber-pumped Ho:YLF laser system capable of generating 4-micron radiation was successfully demonstrated.
The study validated the use of injection seeding for achieving single longitudinal mode operation.
The rate equation model provides a reliable tool for understanding and optimizing HBr molecular laser performance.