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Watt-Level CW Ti:Sapphire Oscillator Directly Pumped with Green Laser Diodes Module
摘要： A watt-level directly diode-pumped continuous-wave (CW) Ti:Sapphire oscillator was demonstrated for the first breakthrough by a high-power green laser-diode-pumped module employing the technologies of beam shaping, beam collimation, polarization beam combining, and fiber coupling. A 1.36-W output power and 10.6% of slope efficiency were obtained based on the double-concave (DC) cavity configuration. This is the highest CW output power from Ti:Sapphire (Ti:S) oscillator directly pumped by green laser diodes (LDs) reported so far.
关键词： Semiconductor laser arrays,Optical pumping,Optical design techniques,Diode lasers
更新于2025-09-19 17:13:59
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5.3 μm-Emitting Diffraction-Limited Leaky-Wave-Coupled Quantum Cascade Laser Phase-Locked Array
摘要： A three-element phase-locked array of ~5.3 μm-emitting quantum cascade lasers fabricated by a two-step MOCVD process is demonstrated which operates in a diffraction-limited beam to 5.3 W peak pulsed power. To compensate for overetching at the array edges, the fabrication process was modified such that it resulted in array elements of equal width. The resulting array operates in a pure in-phase array mode, in agreement with simulations based on the actual device dimensions, which indicate that resonant leaky-wave coupling occurs for this device’s geometry. Measured uniform near-field intensity profiles confirm resonant coupling. Simulations indicate that chirping of the element widths would allow for modification of the near-field intensity profile to mitigate the effects of thermal lensing in continuous-wave operation.
关键词： semiconductor laser arrays,Leaky waves
更新于2025-09-12 10:27:22
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Mode Engineering in Linear Coherently Coupled Vertical Cavity Surface Emitting Laser Arrays
摘要： The supermode tuning of coherent 3×1 vertical-cavity surface-emitting laser arrays are characterized and simulated. The array elements are resonantly tuned to achieve coherent operation using selective current injection. Depending on the electrical bias, multiple coherent supermodes are observed above threshold. An effective index model is developed to account for the variable current injection and to simulate the supermodes of the linear array. Agreement between experimental near-field and far-field coherent modes and our model simulations are found both at and above lasing threshold.
关键词： semiconductor laser arrays,Laser modes,phased arrays,vertical cavity surface emitting lasers (VCSELs)
更新于2025-09-11 14:15:04