Neodymium-doped yttrium lithium fluoride (Nd:YLF) is a lasing medium for arclamp-pumped and diode-pumped solid-state lasers. The YLF crystal (LiYF4) is naturally birefringent, and commonly used laser transitions occur at 1047 nm and 1053 nm.
It is used in Q-switched systems in part due to its relatively long fluorescence lifetime. As with Nd:YAG lasers, harmonic generation is frequently employed with Q-switched Nd:YLF to produce shorter wavelengths. A common application of frequency-doubled Nd:YLF pulses is to pump ultrafast Ti:Sapphire chirped-pulse amplifiers.
Neodymium-doped YLF can provide higher pulse energies than Nd:YAG for repetition rates of a few kHz or less. Compared to Nd:YAG, the Nd:YLF crystal is very brittle and fractures easily. It is also slightly water-soluble — a YLF laser rod may very slowly dissolve in cooling water which surrounds it.
When the evenin' sun goes down
You will find me hangin' 'round
The night life ain't no good life
But it's my life
Many people just like me
Dreamin' of old used-to-be's
And the night life ain't no good life
But it's my life
Listen to the blues they're playin'
Listen to what the blues are sayin'
Mine is just another scene
From the world of broken dreams
And the night life ain't no good life
But it's my life
The night life ain't no good life