Analysis and mitigation of single mode emission limiting factors in high-power RW-DFB laser diodes

Name: Analysis and mitigation of single mode emission limiting factors in high-power RW-DFB laser diodes
Brand: Cuvillier
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By Matthias Reggentin

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Description

This thesis analyzes the spectral and tuning behavior of high-power GaAs-based DFB laser diodes, with special focus on mode hops. Two types of 780 nm DFB lasers were studied:(1) devices with a uniform Bragg grating, HR rear facet, and AR front facet, and(2) devices with both facets AR-coated and a built-in phase shift.Because the facet position relative to the Bragg grating varies after cleaving, certain rear-facet phase conditions cause mode hops during current tuning, especially in configuration (1). Numerical simulations identified these critical phase conditions and revealed the mechanisms behind mode hops-mainly carrier accumulation and temperature gradients. Experiments confirmed the simulation results, including tests with devices featuring an adjustable rear-facet phase via a micro-heater.
The study also found that mechanical strain from mounting strongly influences the lasers' spectral properties; low-temperature bonding successfully prevents this issue.
Phase-shift DFB lasers (configuration (2)) at 780 nm and 1064 nm were demonstrated, offering wide mode-hop-free tuning and record-high output powers of around 100 mW from a single facet. Additionally, tilted ridge waveguides were used to greatly reduce facet reflectivity, easing AR-coating requirements and improving device consistency.

Product details

Binding:: Paperback
Number of Pages:: 144
Release Date:: 2025-10-29
Publication Date:: 2025-10-29
Publisher:: Cuvillier
Languages:: Original: English
ISBN10:: 3689523796
ISBN13:: 9783689523794
GPSR Manufacturer Reference:: [email protected]
Weight:: 197 g
Height:: 148 cm
Width:: 210 cm
Thickness:: 8 cm

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