Spectroscopic and laser characteristics of Ti:Al_2O_3

Moulton, Peter F.

doi:10.1364/josab.3.000125

Cited by 1,155 publications

(467 citation statements)

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“…The coloration of the slightly orangy pink (annealed) synthetic sapphires we examined is due to trivalent titanium: The pealzs seen in the UV-visible spectra at 485 and 560 nm are typical in position and polarization for Ti3+ in corundum (McClure, 1962;Townsend, 1968;Eigenmann et al, 1972;Moslzvin et al, 1980;Moulton, 1986; again, see figures 4 and 5.) The small peak at 390 nm is not seen in most materials colored by Ti3+, and has been attributed to defects (Bessonova et al, 1976) or included &Ti05 (Winkler et al, 1966).…”

Section: Discussionmentioning

confidence: 75%

“…The coloring agent is trivalent titanium (Ti 3 +), and the quality of this material for laser purposes is determined in part by oxidized Ti 4 + (the common oxidation state of titanium in terrestrial minerals): the lower the Ti 4 + concentration, the higher the laser efficiency. Because of this, synthetic Ti-sapphire is usually annealed under reducing conditions (see, e.g., Moulton, 1986)/ which converts residual Ti 4 + impurity to Ti 3 +.…”

Section: Introductionmentioning

confidence: 99%

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"Ti-Sapphire": Czochralski-Pulled Synthetic Pink Sapphire from Union Carbide

Johnson¹,

Mercer²,

Fritsch³

et al. 1995

Gems & Gemology

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One of the most interesting of the commercially available CzochralskiCzochralski-pulled synthetic sapphire was originally grown for technological applications, which require pure crystals with good clarity and even color distribution. Consequently, materials originally intended for such applications can be excellent candidates for use as gems. Czochralskipulled synthetic rubies have been known for a number of years (see, for instance, Nassau and Crowningshield, 1969, and references cited by

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Section: Discussionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

"Ti-Sapphire": Czochralski-Pulled Synthetic Pink Sapphire from Union Carbide

Johnson¹,

Mercer²,

Fritsch³

et al. 1995

Gems & Gemology

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“…3(a), respectively. To obtain the reflectivity profile of this GNC, we, first, fitted the gain profile of the Ti:sapphire laser [53], g(λ), shown as a hatched area in Fig. 3(a) to the analytical function of {f (x)} α in the wavelength range needed for amplification (700-950 nm), and then, the thicknesses of the stacked films are iteratively optimized by using the dumped least-squares method (DLSM) [54] so as to minimize the cost function between the reflectivity profile and the fitted gain profile as a target.…”

Section: Gain Narrowing Compensationmentioning

confidence: 99%

Multi-terawatt laser system generating 12-fs pulses at 100 Hz repetition rate

et al. 2010

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We have developed a laser system generating high peak-power ultrashort pulses based on the chirped pulse amplification of a Ti:sapphire laser. The pulse duration of the laser is reduced to 12 fs, owing to the successful compensation of gain narrowing during amplification with novel optics. The pulse energy and the repetition rate are 40 mJ and 100 Hz, respectively, as a consequence of sufficient energy extraction from a laser medium in the final stage of a multipass amplifier chain, which is designed to balance focusing with a thermal lens against defocusing with convex mirrors without cryogenic cooling for Ti:sapphire crystals. The laser pulses delivered from this laser system are suitable for generating an intense attosecond pulse train in a vacuum ultraviolet or extreme ultraviolet region.

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“…Today, Ti:sapphire crystals are the standard laser medium for achievieng both goals, due to their broad gain bandwidth that extends from about 700 nm to 1100 nm [66] and the possibility to achieve the desired mode locking by exploiting the Kerr-lens effect [67]. The laser system that has been used for most experiments in this thesis is shown schematically in Fig.…”

Section: Generation Of Femtosecond Laser Pulsesmentioning

confidence: 99%