Continuous Phase Modulation Technology Based on Grating Period Interval for High Grating Coupling Efficiency and Precise Wavelength Control

TL;DR

This paper introduces a continuous phase modulation technique for laser array gratings that achieves high coupling efficiency and stable wavelength control, even with manufacturing imperfections.

Contribution

It presents a novel phase modulation method that improves wavelength stability and manufacturing tolerance in laser grating devices.

Findings

Maintains high coupling efficiency comparable to traditional gratings.

Enhances wavelength stability against fabrication errors.

Offers promising applications in precise laser systems.

Abstract

A novel grating modulation technique for laser arrays is proposed and demonstrated. This method modifies the initial phase within each grating period, applying a total phase shift that increments in an arithmetic progression, ensuring equal channel spacing across the array. Despite the varying phase shifts, the device maintains coupling efficiency comparable to traditional uniform grating structures. Furthermore, the continuous phase modulation enhances the stability of the lasing wavelength of the primary mode, reducing sensitivity to fabrication errors. This improved tolerance to manufacturing inaccuracies represents a significant technological advancement, making this approach highly promising for applications requiring precise and stable wavelength control.