External cavity laser assembly with stable output frequency

The compact external cavity laser assembly with a transmission grating and redirector assembly using a piezoelectric actuator addresses the issues of size, cost, and stability in lab-grade lasers, providing accurate and stable output frequency tuning and improved beam quality.

WO2025006351A1 Publication Date: 2025-01-02DAYLIGHT SOLUTIONS INC
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Patent Information

Application Number
PCT/US2024/035120
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-01-26
Filing Date
2024-06-21
Publication Date
2025-01-02

AI Technical Summary

Technical Problem

Lab-grade external cavity laser diode assemblies are large, expensive, and suffer from inaccurate tuning, pointing issues, and high susceptibility to vibrations and acoustics, leading to unstable output frequency.

Method used

A compact external cavity laser assembly design incorporating a transmission grating and redirector assembly with a piezoelectric actuator, allowing for mode hop-free tuning and improved beam quality, stability, and power output, using a flexure guide assembly to minimize vibration sensitivity.

Benefits of technology

The design achieves stable and accurate output frequency tuning over a large spectral range with improved beam quality and power output, while being cost-effective and compact, reducing sensitivity to vibrations and acoustics.

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Abstract

A laser assembly (10) that generates a first beam (40) includes an emitter (16), a transmission grating assembly (20), and a redirector assembly (22). The emitter (16) emits an emitter beam (16a) from a first facet (16c). The transmission grating assembly (20) is positioned in the path of the emitter beam (16a), and the transmission grating assembly (20) diffracts the emitter beam (16a) into the first beam (40) and a second beam (42) during transmission through the transmission grating assembly (20). The redirector assembly (22) receives the second beam (42) and directs a redirected beam (44) at the transmission grating assembly (20) to form an external cavity.
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