Page 128 - Fiber Bragg Gratings

Table 3.1: Common options of UV laser sources for grating formation.

UV wavelength UV
Pump laser (nm) power/energy Beam shape Beam quality Application
KrF 248 1 J/lOOHz, QS Few cm diameter Low spatial/ Mass production,
temporal coher- fiber drawing
ence: requires tower grating
injection lock- fabrication,
ing TYPE II grat-
ings
ArF 193 1 J(lOOHz) QS Few cm diameter Low spatial/ Planar devices,
temporal coher- non-Ge
ence fibers/planar,
direct writing
Quadrupled 266, KDP/BBO >100 mW 5 ns 1 mm diameter 10 mm coherence Hydrogen loaded
Nd:YAG (1064 frequency dou- QS pulses at length, low fibers, planar
nm) biers >lkHz transverse Ge/P doped sil-
beam coher- ica, + RE-
ence doped silica,
Type II grat-
ings
Nd:YAG (355 nm 220-260 tunable >100 mW, 4 ns 2 mm diameter, Low coherence, UV-induced
via frequency extra cavity QS not Gaussian, unless line- index change
mixing) BBO frequency flat-topped or narrowed studies, grat-
doubled triangular ing writing,
material stud-
ies, Type II
grating forma-
tion, scanned
phase mask