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Diffraction-limited collimation optics for a channel waveguide Cerenkov frequency doubler for diode lasers.

K Tatsuno, H Yanagisawa, T Andou

|August 19, 2010

Summary

This study demonstrates how a hemiconic lens can transform Cerenkov second-harmonic generation blue radiation into a parallel plane wave. Modifications to the lens and laser wavelength tuning correct aberrations for an aberration-free beam.

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Area of Science:

Optics
Photonics
Laser Physics

Background:

Cerenkov second-harmonic generation produces blue radiation in an arc.
Converting this arc to a usable parallel plane wave requires advanced optical solutions.

Purpose of the Study:

To investigate the use of a hemiconic lens for beam shaping.
To achieve an aberration-free parallel plane wave from Cerenkov radiation.
To correct for chromatic aberration in the generated blue light.

Main Methods:

Optical path analysis using diffraction theory and geometrical ray tracing.
Collimation experiments with a hemiconic lens.
Modification of the cone apex angle based on waveguide birefringence.
Diode laser wavelength tuning with an achromatic cone lens doublet.

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Main Results:

A hemiconic lens successfully converts the arc of blue radiation to a parallel plane wave.
Adjusting the apex angle corrects for aberrations, yielding an aberration-free wave.
Achromatic cone lens doublets and laser tuning effectively correct chromatic aberration.

Conclusions:

Hemiconic lenses are effective for transforming Cerenkov second-harmonic generation radiation.
Aberration correction is achievable through precise optical design and laser parameter control.
This method provides a viable route to generating high-quality plane waves for optical applications.