Spectroscopic properties of Tm,Ho:CaYAlO₄ single crystal

Abstract

A Tm,Ho:CaYAlO4 single crystal was grown using the Czochralski (CZ) method. The absorption spectra, the fluorescence spectrum around 2 μm, the upconversion spectrum and energy‐transfer (ET) schemes between Tm3+ ions and Ho3+ ions have been studied. The crystal boule was free from cracks, inclusions and scattering centers. The broad FWHM of the 797‐nm absorption band (with E//c polarization is 19 nm and with E//a polarization is 18 nm), the large emission bandwidth (about 600 nm) and the intense ET from Tm3+ ions to Ho3+ ions make Tm,Ho:CaYAlO4 a promising media for tunable and ultrashort pulses.

Growth and spectroscopic properties of the 2.9μm Tm,Ho:LuYAG laser crystals

“…However, the Ho 3+ singly doped crystals exhibit low absorption and pumping efficiencies when they are pumped by commercially laser diode (LD) or flash lamp. To solve this problem, Tm 3+ or Yb 3+ ions could be selected as the sensitizer for the Ho 3+ ions to improve the absorption and pumping efficiencies [12][13][14][15].…”

Passively Q-Switched Mode-Locked Tm,Ho:CaYAlO4 Laser Based on Double-Walled Carbon Nanotube Saturable Absorber

“…CaYAlO 4 (CYA) crystal belongs to the perovskite structure, which is an excellent laser medium matrix material fabricated by the Czochralski method [40]. Tm,Ho:CaYAlO 4 crystals have higher absorption efficiency and wider tuning width, and their main absorption peaks are 691, 797, 1,212, and 1,694 nm [41]. Currently, there are few researches on related mode locking of this crystal.…”