
High-resolution spectroscopic frequency measurements 343
P
Z
T
PD
PD
+
)
(
(
M2
A/Dconverter
PC
OF phase
controlcircuit
DiodeLaser
M0
M1
L
1
L
2
OF
T
ranslationstage
BS
A
FIGURE 5.10
V-shaped cavity setup for OF-CEAS. Only a restrained part of the exiting resonant intra-
cavity field is allowed to c ome back to the laser. At the same time, the realized optical
feedback induces a laser linewidth reduction and provides an automatic laser-to-cavity-
mode frequency locking. This elegantly overcomes the drawback of a noisy cavity output.
The variable a ttenuator (A) adjusts the OF level, whereas the PZT-mounted steering mirror
controls the phase of the OF field. The translation ...