{"product_id":"matthias-reggentin-analysis-and-mitigation-of-single-mode-emission-limiting-factors-in-high-power-rw-dfb-laser-diodes-9783689523794","title":"Analysis and mitigation of single mode emission limiting factors in high-power RW-DFB laser diodes","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.\n\u003cbr\u003e\nThe study also found that mechanical strain from mounting strongly influences the lasers' spectral properties; low-temperature bonding successfully prevents this issue.\n\u003cbr\u003e\nPhase-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.","brand":"Cuvillier","offers":[{"title":"Default Title","offer_id":53818684408150,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0925\/5829\/5382\/files\/product_image_9783689523794_1.jpg?v=1781822016","url":"https:\/\/www.momoxbooks.com\/products\/matthias-reggentin-analysis-and-mitigation-of-single-mode-emission-limiting-factors-in-high-power-rw-dfb-laser-diodes-9783689523794","provider":"momoxbooks","version":"1.0","type":"link"}