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Multiplexed tunable holographic phase masks for generation of vortex beams (Conference Presentation)
Although the majority of current applications of narrow line diode lasers require CW operation, there are a variety of fields where operation in a different pulse mode regime is necessary. Commercial electric pulse generators can provide arbitrary current pulse profiles (sinusoidal, rectangular, triangular and their combinations). The pulse duration and repetition rate however, have an influence on the laser diode temperature, and therefore, the emitting wavelength. Thus, a detailed analysis is needed to understand the correspondence between the optical pulse profiles from a diode laser and the current pulse profiles; how the pulse profile and duty cycle affects the laser performance (e.g. the wavelength stability, signal to noise ratio, power stability etc.). We present the results of detailed studies of the narrowband laser diode performance operating in different temporal regimes with arbitrary pulse profiles. The developed narrowband (16 pm) tunable laser systems at 795 nm are capable of operating in different pulse regimes while keeping the linewidth, wavelength, and signal-to-noise ratio (>20 dB) similar to the corresponding CW modules.
Photostructural transformation of chalcogenide glasses under nonlinear absorption of laser radiation
This course explains basic principles and applications of volume Bragg gratings (VBGs) that are holographic optical elements recorded in volume of photo-thermo-refractive optical glass. These elements enable dramatic increase of brightness of lasers and resolution of spectral analyzers. The goal of the course is to describe features of photosensitive optical glass , properties of VBGs, principles of gratings modeling and design, main types of optical components based on VBGs, and amazing results of their use in lasers and photonic devices. People who want to bring lasers and photonic devices to new level will benefit from taking this course.
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