Cryogenic laser operation of a “mixed” Yb:LuYAG garnet crystal

Yttrium Aluminum Garnet Laser Materials

Er:YAG single-crystal fiber laser in Q-switched operation

We describe an efficient Q-switched laser emission from a directly grown Er :YAG single-crystal fiber resonantly pumped by a laser diode in an off-axis configuration. The laser produces 2 mJ, 38 ns pulses at 1 kHz. OCIS codes: (140.3580) Lasers, solid-state, (140.3480) Lasers, diode-pumped, (140.3540) Lasers, Q-switched, (140.3380) Laser materials, (140.3500) Lasers, erbium.

Laser cooling of solids to cryogenic temperatures

Laser radiation has been used to cool matter ranging from dilute gases to micromechanical oscillators. In Doppler cooling of gases, the translational energy of atoms is lowered through interaction with a laser field1,2. Recently, cooling of a high-density gas through collisional redistribution of radiation has been demonstrated3. In laser cooling of solids, heat is removed through the annihilat...

Laser-induced magnetization dynamics in a cobalt/garnet heterostructure

We report on magnetization dynamics triggered in a Co/garnet heterostructure by femtosecond laser pulses. Although laser excitation of a bare Co-doped yttrium iron garnet leads to magnetization precession, the phase of which strongly depends on the linear polarization of the light pulses, the deposition of an ultrathin Co layer on a top of a garnet film results in substantial changes of the las...

Operation of SiGe bipolar technology at cryogenic temperatures

The recent introduction of silicon-germanium (SiGe) alloys has proven exceptionally promising for achieving excellent bipolar transistor performance at cryogenic temperatures, while maintaining the cost and yield advantages traditionally associated with silicon (Si) manufacturing. In this paper we review the features of silicon-germanium heterojunction bipolar transistors (SiGe HBTs) which make...