THORLABS Redstone OSA305 User Manual

Redstone™ Optical Spectrum Analyzer Chapter 8: Operation
Page 23 STN053070-D02
• Wavelength (nm) in Air
• Wavelength (nm) in Vacuum
• Frequency (THz)
• Photon Energy (eV)
Figure 16. Setting the Horizontal Axis Unit
8.3.4. Displaying the Secondary Horizontal Axis
In Spectrum view, it is possible to add a secondary horizontal axis, simply by selecting a unit for it in the 2nd x-
axis combo box in the settings bar. The available options are the same as for the primary axis.
Figure 17. Showing the Secondary Horizontal Axis and Setting its Unit
8.3.5. Setting the Unit of the Vertical Axis
In Interferogram view, the vertical axis displays the interferogram as a percentage of the full measurable range
(default) or in “counts” on the ADC. To switch between the two units, open the Settings dialog, select the Display
page, and check or uncheck the box “Interferogram in Percent” (see Section 9.1.2 Display Settings).
In Spectrum view, the vertical axis is set by default to show optical power in linear scale in mW, but it can also
be set to dBm by selecting “Log” from the vertical axis unit combo box in the settings bar.
Figure 18. Setting the Vertical Axis Unit
8.3.6. Displaying the Secondary Vertical Axis
In the Thorlabs OSA Software the traces can be shown on either the primary axis with its labels and units
displayed to the left of the graph or on the secondary axis with its labels and units displayed to the right of the
graph.
To change on which vertical axis a trace is displayed, click the icon of the trace you want to change. This will
bring up a menu with options and operations for that trace. Click on the option “Move to secondary axis” to move
the trace to the secondary axis. To move the trace back to the primary axis, click on the trace again, and the

THORLABS Redstone OSA305 Specifications

General

Brand	THORLABS
Model	Redstone OSA305
Category	Measuring Instruments
Language	English