Up to date

in seeking for the new materials for ～2μm laser

the Tm doped or Tm

Ho co-doped YAG

YLF crystals have attracted much more attention.In this paper

the measured results of spectroscopic properties in Tm

Ho co-doped YVO

4

crystal were reported.The absorption spectra

fluorescence spectra and calculated spectroscopic parameters were given

the processes of sensitized luminescence of Ho

3+

by Tm

3+

with LD pump at 805nm were investigated.It was found that Tm

3+

ion in YVO

4

has a larger uniform absorption width(～26nm) and a larger peak and integrated cross section of absorption at ～800nm(～1 4×10

-20

cm

2

and 274 5×10

-20

cm) than that in YAG and YLF

which

in practical

may loose the requirement for temperature tuning.The high energy transfer efficiency from Tm

3+

(up to 87%) and low pumping threshold(～15mW) show that Tm

3+

can efficiently sensitizes Ho

3+

for ～2μm emission in YVO

4

crystal.The dependence of ～2μm emission for Ho

3+

on the Tm

Ho doping concentration was preliminarily analyzed and discussed.In one word

Tm:Ho:YVO

4

crystal may be a promising candidate for LD pump

compact

all solid state 2μm laser material.