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Two-photon-pumped frequency-upconverted blue lasing in coumarin dye solution.

G S He, R Signorini, P N Prasad

|February 21, 2008

Summary

Two-photon-pumped blue lasing was achieved using Coumarin 500 dye. Researchers controlled lasing properties and achieved a 4.8% conversion efficiency for this frequency-upconverted laser technology.

Area of Science:

Nonlinear optics
Laser physics
Materials science

Background:

Two-photon-pumped (TPP) lasers offer unique frequency-upconversion capabilities.
Coumarin dyes are known for their fluorescence properties, making them candidates for TPP lasing.
Efficient blue light generation via TPP is of interest for various applications.

Purpose of the Study:

To experimentally investigate two-photon-pumped frequency-upconverted blue lasing in Coumarin 500 dye solution.
To characterize the spectral, temporal, and spatial properties of the generated blue laser light.
To determine the output-input characteristics and conversion efficiency of the TPP lasing system.

Main Methods:

Utilized ~800-nm laser pulses with ~5-ns duration to pump Coumarin 500 dye solution in chloroform.

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Employed a 1-cm-long quartz cuvette to contain the dye solution for lasing.

Measured lasing wavelength, spectral structure, temporal dynamics, spatial profile, and output-input energy characteristics.

Investigated control of lasing properties by attaching an optical plate to the cuvette.

Main Results:

Achieved shortest lasing wavelength of approximately 479 nm (blue light).
Demonstrated control over spectral structure and longitudinal mode numbers by simple optical adjustments.
Measured a net conversion efficiency of approximately 4.8% from absorbed pump energy to blue laser output.

Conclusions:

Two-photon-pumped blue lasing from Coumarin 500 dye solution is feasible and experimentally verified.
Lasing characteristics can be effectively tuned through simple optical modifications.
The achieved conversion efficiency indicates potential for practical applications of TPP blue lasers.