Abstract
We present detailed measurements of effective emission cross section spectra of the Alexandrite gain medium in the 25-450 °C temperature range and provide analytic formulas that can be used to match the measured spectra. The measurement results have been used to investigate the wavelength and temperature dependence of small signal gain, as well as gain bandwidth relevant for ultrafast pulse generation/amplification. We show that the estimated laser performance based on the measured spectroscopic data provides a good fit to the results in the literature. We further discuss the need for a detailed measurement of excited-state absorption cross section in future studies.
Highlights
Alexandrite laser crystals possess a broad emission band centered around 750 nm that enables tunable laser operation in the 700-860 nm wavelength range [1,2,3,4,5]
We present detailed measurements of effective emission cross section spectra of the Alexandrite gain medium in the 25-450 °C temperature range and provide analytic formulas that can be used to match the measured spectra
We have presented a detailed analysis of effective emission cross section spectra of the Alexandrite gain medium in the 25-450 °C temperature range
Summary
Alexandrite (chromium-doped chrysoberyl, Cr3+ :BeAl2O4) laser crystals possess a broad emission band centered around 750 nm that enables tunable laser operation in the 700-860 nm wavelength range [1,2,3,4,5]. It has extensive absorption bands in the visible region of the optical spectrum, which facilitate efficient pumping either by flahslamps or by red laser diodes. Mode-locking of Alexandrite using Saturable Bragg Reflectors (SBRs) [26], Kerr-lensing [27,28], and graphene saturable absorbers [29] has been demonstrated recently
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