MOGlabs MOA, Manual, Page: 11 / 66

1. Introduction
The
MOGL
abs
MSA
is a semiconductor laser amplifier with injection seed
laser (fig. 1.1). The heart of the system is the amplifier block (fig. 1.2) with
semiconductor tapered amplifier (
TA
) diode. A cylindrical lens provides
astigmatism compensation and Faraday isolators protect the
TA
diode, as
well as preventing the amplifier output from disturbing the seed laser.
Figure 1.1:
Schematic diagram of major components in the
MSA
.
The
MOA
is an amplifier-only configuration of the
MSA
, without built-in
seed laser. There are two smaller versions of the
MOA
; the
MOA(L)
with
one isolator on the
TA
output and the compact
MOA(C)
without isolators.
Fibre coupling options are available for the
MSA
/
MOA
/
MOA(L)
output and
for
MOA
/
MOA(L)
input with an external seed laser.
The
TA
diode is mounted in a block (U-chassis) with aspheric input and
output lenses in flexure
x − y
translation stages (fig. 1.2). The flexure
mounts control the transverse positions of the input (focusing) and out-
put (collimation) lenses, providing precise lens alignment with mechanical
1