Extended Tuning Range of Alexandrite at Elevated Temperatures

Kuper, J. W.; Chin, T.; Aschoff, Howard

doi:10.1364/assl.1990.cl3

Cited by 16 publications

(27 citation statements)

References 3 publications

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“…5, at crystal temperatures of 10 • C and 60 • C. The optimum wavelengths of 765 nm and 770 nm at 10 • C and 60 • C, respectively, are typical for Alexandrite [1,7,16]. Elevated temperatures extended the upper tuning range, as has been previously reported [2], but in turn increased the lower bound by 7 nm. The higher temperatures resulted in improved output powers above 750 nm.…”

Section: Diode-pumped Wavelength Tunable Alexan-dritesupporting

confidence: 78%

“…It can operate on a vibronic transition, giving continuously wavelength tunable operation with a demonstrated range of 701 nm to 858 nm [2].…”

Section: Introductionmentioning

confidence: 99%

“…Early work on Alexandrite used flash lamp pumping [1][2][3][4]; however, its broad absorption bands also permit pumping with red laser diodes [5]. Recent advancements in high power red laser diodes has enabled efficient and multi-watt diode pumped operation [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Kerridge-Johns¹,

Damzen²

2016

J. Opt. Soc. Am. B

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An analytical model is formulated to support understanding and underpin experimental development of laser action in the promising diode end-pumped Alexandrite system. Closed form solutions are found for output power, threshold and slope efficiency that for the first time incorporate the combined effects of laser ground state absorption (GSA) and excited state absorption (laser ESA), along with pump excited state absorption (pump ESA), in the case of an end-pumping geometry. Comparison is made between model predictions and experimental results from a fibre-delivered diode end-pumped Alexandrite laser system, showing the impact of wavelength tuning, crystal temperature, laser output coupling, and intracavity loss. The model is broadly applicable to other quasi-three-level lasers with combined laser and pump ESA. A condition for bistable operation is also formulated.

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Section: Diode-pumped Wavelength Tunable Alexan-dritesupporting

confidence: 78%

“…It can operate on a vibronic transition, giving continuously wavelength tunable operation with a demonstrated range of 701 nm to 858 nm [2].…”

Section: Introductionmentioning

confidence: 99%

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Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Kerridge-Johns¹,

Damzen²

2016

J. Opt. Soc. Am. B

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“…It has many superior optical and thermal properties (see Table 1), including an intrinsic slope efficiency of 65% [36], a broad tuning range from 700 to 860 nm [24,33], lack of concentration quenching of fluorescence lifetime [31], and, interestingly, increased laser performance at elevated temperatures above room temperature [33]. Due to all of these, alexandrite was one of the most popular tunable lasers on the market during the 1980s [31].…”

Section: Introductionmentioning

confidence: 99%

Tapered diode-pumped continuous-wave alexandrite laser

et al. 2013

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We describe a low-cost and efficient alexandrite (Cr:BeAl 2 O 4 ) laser that is pumped by a high-brightness tapered diode laser (TDL). The tapered diode (TD) provides up to 1.1 W of output power and its wavelength can be finetuned to either 680.4 nm (R1 line) or 678.5 nm (R2 line) for efficient in-line pumping. Continuous-wave (cw) output powers of 200 mW, slope efficiencies as high as 38%, and a cw tuning range extending from 724 to 816 nm have been achieved. To the best of our knowledge, the cw power levels and slope efficiencies are the highest demonstrated so far from such a minimal complexity and low-cost system based on the alexandrite gain medium. Consequently, TDs operating in the red spectral region have the potential to become the standard pump sources for cw alexandrite lasers in the near future.

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“…Alexandrite (Cr +3 doped chrysoberyl: BeAl 2 O 4 ) is a well-known tunable laser material with peak output near 752 nm and broad tunability from 726 to 860 nm [1,2]. The material has a low stimulated emission cross section of 0.5 x 10 -20 cm 2 at room temperature, which increases to by a factor of ten at elevated temperatures [1].…”

Section: Introductionmentioning

confidence: 99%

High efficiency CW green-pumped alexandrite lasers

Kuper

Brown

2006

SPIE Proceedings

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High power, CW and pulsed alexandrite lasers were produced by pumping the laser rod with high quality diode pumped 532 nm laser sources. This pumping architecture provides stable performance with output power > 1.4 W at 767nm in the free running mode and 0.78W at 1000 Hz. An output of 80 mW at 375.5 nm was achieved at 500 Hz. This approach holds promise for the production of a scalable diode-pumped, tunable alexandrite laser systems operating in the near infrared (750 nm), and the ultraviolet (375 and 250 nm) spectral regions.

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Extended Tuning Range of Alexandrite at Elevated Temperatures

Cited by 16 publications

References 3 publications

Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison

Tapered diode-pumped continuous-wave alexandrite laser

High efficiency CW green-pumped alexandrite lasers

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