Mode-locked shared gain coupled VECSEL cavities exhibit novel lasing properties with dual cavities supporting independently running mode-locked fs pulse trains. Using an extended Maxwell – Semiconductor Bloch microscopic model, we show that initial simulations support experimentally observed independent mode-locking at separated wavelengths with little evidence for gain competition. Our extended SBE model expands the microscopic carrier populations and polarizations in a nonparaxial grating basis to capture large angle incident beams on the gain chip. Preliminary simulations support uncoupled mode-locking showing pulses simultaneously incident on the gain chip and we identify a novel independent mechanism for the wavelength selectivity.
Conventional design of engineered nanostructures for controlling and manipulating the propagation of electromagnetic waves has been established in the literature over the past several years. Challenges in design, optimization, fabrication, and characterization of such structures have motivated extensive research activities in the field of engineered nanostructure materials and devices. In the present work we utilize an evolutionary optimization algorithm to design a metasurface. The metasurface considered exhibits achromatic performance over the visible range of electromagnetic spectrum.
A mode-locked VECSEL is reported using a novel hybrid semiconductor saturable absorber mirror (SESAM) consisting of a semiconductor absorber region bonded to a curved dielectric partial reflector. The hybrid SESAM is realized by direct bonding of the saturable absorber to a commercially available ultrafast output coupler, nominally 99.4% reflectivity and GDD of ≤ |20 fs2| with a radius of curvature of 10 cm. In a linear cavity where the curved output coupler is the hybrid SESAM, a pulse-width of 410 femtoseconds is achieved at a repetition rate of 4.2 GHz for a VECSEL operating at a wavelength of 1030 nm.
We build and model coupled GHz rep rate mode-locked VECSEL cavities sharing a common gain medium. The goal is to understand both experimentally and theoretically, gain competition between pulse trains in each cavity while varying relative rep rates and explore applications.
Computerized ray-tracing has exponentially evolved since its inception. Various software companies have assisted the optical designer in optimization of lens designs. We introduce a fully automatic optimization method reducing optimization time ten-fold.
Gradient Index (GRIN) Optics is a challenging frontier of lens design. We have developed a free, online toolbox for generating gradient optics dynamic linked library (GODLL) files representing an arbitrary, user-defined gradient index profile for use with Zemax OpticStudio. In order to show the accuracy, user-experience and the procedure for usage of GODLL, we have demonstrated the performance of our toolbox using several popular or extreme examples consisting of Maxwells Fisheye Lens, Luneberg Lens, and a typical SELFOC lens.
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