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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Interference-filter-tuned, alignment-stabilized, semiconductor external-cavity laser.

P Zorabedian, W R Trutna

|September 12, 2009

Summary

This summary is machine-generated.

A new interference-filter-tuned semiconductor laser offers 260x better alignment tolerance than grating-tuned lasers, with a similar tuning range. This advance improves laser stability and performance for optical applications.

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Laser Engineering

Background:

External-cavity semiconductor lasers are crucial for tunable light sources.
Conventional grating-tuned lasers face limitations in alignment stability.
Interference filters offer a potential alternative for laser tuning.

Purpose of the Study:

To compare the angular alignment tolerance and tuning range of a novel interference-filter-tuned semiconductor external-cavity laser (IF-SEC) with a conventional grating-tuned external-cavity laser (GT-EC).
To evaluate the performance of an InGaAsP Fabry-Perot laser as a gain medium in both laser configurations.

Main Methods:

A degenerate resonator design was employed for the novel IF-SEC laser.
A 1300-nm InGaAsP Fabry-Perot laser with an antireflection-coated facet served as the gain medium.
Angular alignment tolerance and tuning range were experimentally measured and compared between the two laser types.

Main Results:

The IF-SEC laser demonstrated a 260-fold greater angular alignment tolerance (+/-26 mrad) compared to the GT-EC laser (+/-0.1 mrad).
The tuning range of the IF-SEC laser (90 nm) was comparable to that of the GT-EC laser (110 nm).

Conclusions:

The novel interference-filter-tuned semiconductor external-cavity laser offers significantly improved alignment stability over traditional grating-tuned designs.
This enhanced stability, coupled with a comparable tuning range, makes the IF-SEC laser a promising candidate for applications requiring robust and tunable laser sources.