Tunable chromium forsterite laser in the near IR region

Baryshevskii, V. G.; Korzhik, M. V.; Kimaev, A. E.; Livshits, M. G.; Pavlenko, V. B.; Meilman, M. L.; Minkov, B. I.

doi:10.1007/bf00665134

Cited by 18 publications

(2 citation statements)

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“…• Moreover, in the case of Alexandrite, only around 78% of the doped Cr 3+ ions are on laser active sites [83]. As a result, assuming a reasonable inversion level of 25%, in a 0.2% Cr-doped Alexandrite crystal, the ion density in the upper laser level is only around 1.37x10 19 ions/cm 3 (0.25 x 0.2 x 0.78 x 3.51x10 20 ions/cm 3 [49]). The emission cross section of Alexandrite at 765 nm at 100 °C is around 1.3 x10 -20 cm 2 , and neglecting ESA, this results in a small signal gain coefficient (g 0 ) of only around 0.18 cm -1 .…”

Section: Published Bymentioning

confidence: 99%

“…Part of this search is focused on other Yb +3 -doped gain media such as Yb:YLF [8,9], Yb:CALGO [10], and Yb:KYW [11]; however, the emission bandwidth of these materials are also rather limited. As an alternative, transition-metal doped laser materials such as Ti:Sapphire (660-1180 nm) [12][13][14], Alexandrite (701-858 nm) [15][16][17][18][19], Cr:Forsterite (1130-1367) [20,21], Cr:ZnSe (1880-3350 nm) [22,23], etc... provide significantly broader optical gain bandwidth at different regions of the optical spectrum, and investigation of their TD…”

Section: Introductionmentioning

confidence: 99%

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Alexandrite: an attractive thin-disk laser material alternative to Yb:YAG?

Demırbas

Kärtner

2020

J. Opt. Soc. Am. B

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Yb:YAG thin-disk (TD) technology has enabled construction of laser/amplifier systems with unprecedented average/peak power levels, and became the work-horse of many scientific investigations. On the other hand, for some applications, the narrow emission bandwidth of Yb:YAG limits its potential, and search for alternative broadband TD gain media with suitable thermo-opto-mechanical parameters is ongoing. The alexandrite gain medium has a broad emission spectrum centered around 750 nm, possesses thermomechanical strength that even outperforms Yb:YAG, and owns unique spectroscopic properties enabling efficient laser operation even at elevated temperatures. In this work, we have numerically investigated the power scaling potential of continuous-wave (cw) Alexandrite lasers in TD geometry for the first time. Using a detailed laser model, we have compared the potential cw laser performance of Yb:YAG, Ti:Sapphire, Cr:LiSAF, Cr:LiCAF and Alexandrite thin disk lasers under similar conditions, and show that among the investigated transition metal doped gain media, Alexandrite is the best alternative to Yb:YAG in power scaling studies at room temperature. Our analysis further demonstrates that potentially Ti:Sapphire is also a good alternative TD material, but only at cryogenic temperatures. However, in comparison with Yb:YAG, the achievable laser gain is relatively low for both Alexandrite and Ti:Sapphire, which then requires usage of low-loss cavities with small output coupling, for efficient continuous-wave operation.

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