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A Ti:sapphire oscillator tunable over 138 nm and maintaining a spectral linewidth less than 15 pm with no spectral jitter is presented. Outputs in the 200 mW regime with an excellent beam quality were achieved.
Spectral narrowing of Ti:sapphire down to two longitudinal modes has been achieved in the 3 W pump power range and 200 mW output using a compact design. Further improvements leading to single mode operation are discussed.
90% efficient large aperture tunable optical filters having very narrow spectral width and realized by the incoherent association of a volume Bragg grating and a Fabry-Perot etalon are described and demonstrated.
Volume Bragg gratings (VBG) with efficiency exceeding 95% recorded in a novel patented material, which is a photo-thermo-refractive (PTR) glass, and used for high-power laser beam control. Exceptionally narrow spectral and/or angular selectivity are used for angular magnification in laser scanners, spectral beam combining, and spectral stabilization of semiconductor lasers.
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