High-efficiency resonantly pumped room temperature Ho:YVO_4 laser

Abstract

An efficient 2 μm room temperature Ho:YVO(4) laser resonantly pumped by a 1.94 μm Tm:YAP laser is demonstrated, for the first time to our knowledge, in this Letter. Up to 8.58 W of laser output at 2053 nm is obtained with the optical-to-optical conversion efficiency as much as 41.2%. The output beam had quality of M² factor with Mx(2) of 3.58 and My(2) of 1.76 at 8 W output level. In addition, we also obtained 4.18 W laser output at 2066 nm and 7.04 W at 2040 nm from the Ho:YVO(4) laser with conversion efficiency of 27.8% and 33.8%, respectively.

A passively Q-switched Ho:YVO4 Laser at 2.05 μm with Graphene Saturable Absorber

“…Ho:YVO 4 has been shown to be an excellent laser host for 2 µm laser radiation [20]. It is sufficiently hard (Mohs hardness 5), nonhygroscopic, and resistive to chemicals, with large emission cross section and long fluorescence decay lifetime of Ho 5 I 7 manifold ("4 ms).…”

High-Power in-Band Pumped a-Cut Ho:Yap Laser

“…Direct (in-band) pumping the Ho 5 I 7 manifold offers several advantages, including high quantum efficiency, minimum heating, as well as reduced up-conversion losses caused by sensitized Tm. To date, in-band pumping of singly Ho-doped lasers such as YAG [4][5][6], LuAG [7], YVO 4 [8], and YLF [9,10] lasers have been reported.…”

Resonantly pumped room temperature Ho:LuVO_4 laser

“…In 2011, Newburgh and Dubinskii reported the first experimental study of Ho:YVO 4 lasers at liquid nitrogen temperatures (∼77 K), and obtained 1.6 W laser output at 2.05 μm [8]. In the same year, Li et al realized 2.05 μm Ho:YVO 4 laser output, with an 8.58 W laser power at room temperature [9]. A LuVO 4 crystal with a space point group of D 4 h − 14∕amd, as a kind of vanadate crystal, belongs to the uniaxial crystal of the tetragonal crystal system.…”