Page 440 - Tunable Lasers Handbook

400 Paul Zorabedian

TUNING
AXIS
c3,
DIFFRACTION

CYLINDRICAL

COLLIMP.TIN6
OBJECTIVE
OUTPUT
FIGURE 27 Alignment stabilization of a Littrowgrating ECL using a cylindrical lens. (Repro-
duced with permission from Zorabedian and Trutna [60].)

Output beam

FIGURE 2 8 Grazing-incidence grating extended-cavity laser. (Reproduced with permission
from Harvey and Myatt [Sj].)

rod collimating lenses attached to fiber ends. The laser’s output was obtained
with a 3-dB fiber directional coupler. The electron-beam-evaporated SiOk AR
coatings on the optical amplifier had a residual reflectance of less than 10-4 per
facet. The total cavity round-trip loss was 16 dB, including 3 dB for the output
coupler. The laser tuned from 1270 to 1370 nm. However, the filter bandwidth
was -5 nm because of the small spot produced on the grating by the rod lens,
and single-longitudinal-mode oscillation was not obtained.
Peng and Su [88] described a 1300-nm free-space ring ECL comprising a
1000-pm-long tilted-stripe amplifier, a 600 groove/mm grating, and an optical