Toptica DL pro User manual

WARNING
This troubleshooting guide represents only a coarse outline of
the steps necessary to get the laser system back to its
specification. It does only complement, not replace the user
manual.
Before taking any of the following steps the user must
familiarize himself with the hazards involved when mainting a
laser source. READ AND FOLLOW THE SAFETY
INSTRUCTIONS AND WARNINGS in the user manual
carefully before you proceed. TOPTICA cannot be held liable
for injuries and / or damage caused by improper use of its
lasers. If you feel unsure, please contact TOPTICA's service
department first. Proceed at your own risk!
NOTE
The references given in this guide are valid for the DL pro user manual, issue February 2008.
Other (especially older) versions of the manual have a different structure or may not contain all the
information. Please contact us if you wish to receive a printed copy of the most recent manual.
DL pro
Troubleshooting guide

NO YES
NO
YES
YES
Lasing
threshold
o.k ?
Reinsert grating and
adjust feedback, see
DL pro manual
chapter 6.6.2
Output power too
low / no output
Compare lasing
threshold with test
data sheet1
Threshold
improved?
Compare free-
running lasing
power with test
data sheet2
Power below
spec?
NO
Output
power o.k?
Contact
TOPTICA
Contact
TOPTICA
1See page 1, section 4
2See page 2, section 6. in order to measure the free
running properties of the diodes remove the grating
mount according to Chapter 6.1, step 3 .
Beam
clipped ?
Power
above spec?
Diode defective
AR coating
degraded
YES
NO
Shutter
open?
Interlock plug
connected?
YES
YES
Connect interlock
plug
NO
Open shutter
NO
OK
YES
NO
NO

Lasing
threshold
o.k ?
YES
NO
Mode-hop-free
tuning range
(MFTR) too small
Compare lasing
threshold with test
data sheet2
MFTR o.k?
Contact
TOPTICA
3See page 2, section 6
measure resis-
tance across piezo
Resistance
∞? Piezo defective
NO
NO
YES
check voltage
output from SC 110
Voltage
ramp 0-150
V?
Check HV fuse in
DC 1104Fuse o.k.? replace fuse
NO NO NO
YES
opt. isolator
behind laser? YES
NO
check for optical
feedback from
external components
Adjust current
and feed forward1
1See Sys DC user manual, chapter 3.1
success ? Yes
OK
OK
YES
4See Sys DC user manual, chapter 5.4
2See page 1, section 4
NO
Reinsert grating and
adjust feedback, see
DL pro manual
chapter 6.6.2
Threshold
improved?
Compare free-
running lasing
power with test
data sheet2
Power =
specs?
Diode defective
YES
YES
Contact
TOPTICA
NO
YES
NO