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Updated: Dec 21, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Wavelength locking in a large-smile diode-laser array using dual-beam transformation systems.

Bin Liu, Hui Liu, Fenning Chen

|May 14, 2020

Summary

Dual-beam transformation systems (dual BTSs) enhance high-power diode lasers by reducing divergence. This enables a wide wavelength-locking range and improves performance across various temperatures.

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Last Updated: Dec 21, 2025

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Published on: January 28, 2019

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Published on: April 24, 2014

Area of Science:

Optics and Photonics
Laser Technology
Semiconductor Devices

Background:

High-power diode-laser arrays often exhibit a 'smile' (spatial deviation) affecting performance.
Achieving a wide wavelength-locking range is crucial for tunable laser applications.

Purpose of the Study:

To investigate the effectiveness of dual-beam transformation systems (dual BTSs) in improving diode-laser array performance.
To enhance the wavelength-locking range and side-mode suppression ratio of high-power diode lasers.

Main Methods:

Utilized a set of two angled dual BTSs placed in front of a diode-laser array with a 2 µm smile.
Measured the collimating residual divergence angle before and after implementing the dual BTSs.
Evaluated the wavelength-locking range and side-mode suppression ratio using an external cavity with a volume Bragg grating.

Main Results:

Reduced the collimating residual divergence angle from 9 mrad to less than 6.5 mrad.
Achieved a wide wavelength-locking range for temperatures between 20°C and 30°C.
Demonstrated a side-mode suppression ratio exceeding 30 dB.

Conclusions:

Dual BTSs effectively reduce divergence in high-power diode-laser arrays.
The improved divergence enables a significantly wider wavelength-locking range.
The system shows promise for applications requiring stable, tunable, high-power laser output.