MOGlabs CEX User Manual

1.2 Piezo-electric frequency control 3
bytheOCandthedioderearfacet,andwhentheexternalfeedbackis
greater than that of the front facet, the external cavity determines the
lasing wavelength. The effectiveexternal cavityis20 to40mm longwith
cavity mode spacing (FSR)of c/2nL = 3.5 to 7GHz.
1.1.1 Filter
Thefilterselectsonelongitudinalcavitymode,androtationofthefilter
allowsselectionofwhichmode, withinthegainbandwidthofthelaser
diode(seefigure 1.3).Filteradjustmentscan achievewavelength changes
better than 0.1nm precision at 780nm.
384.0 384.1 384.2 384.3 384.4
Frequency (THz)
External cavity
Diode cavity
Diode gain
COMBINED
Filter
Figure 1.3: Schematicrepresentationforthevariousfrequency-dependentfactors
of anECDL, adaptedfrom Ref. [6], forwavelength λ =780nm and externalcavity
length L
ext
=15mm.
1.2 Piezo-electric frequency control
Smallchangestothelaserfrequencyareachievedbycontrollingtheexter-
nal cavity length witha piezo electric actuator.For the MOGLabs cateye
laser,thefrequencychangeisabout20GHzoverthe150Vrange ofthe
piezo.

MOGlabs CEX Specifications

General

Brand	MOGlabs
Model	CEX
Category	Measuring Instruments
Language	English