Knowledge Center/ Questions Techniques Fréquemment Posées/ Questions Techniques Fréquemment Posées/ Detectors/ I am trying to get a sample read out from a laser diode on an oscilloscope. I get a good pulse signal if I shine my keychain flashlight on the detector, but a very noisy signal from the diode itself. What could be causing the noise in this system?
It seems like you are experiencing some temporally-localized interference. If you look at a short enough slice of time, the photodiode might pick up the constantly shifting course of constructive and destructive interference that is basically what its called speckle.
Laser Diode Modules have a fair amount of noise if you look on a very short time scale. The total noise is a combination from multiple sources including but not limited to power supply noise, mode hopping, thermal effects, and optical feedback. These noise sources can be severely reduced by using a low-noise power supply and a heat sink or preferably a Thermo-electrically cooled (TEC) laser. In order for a laser to have a perfectly consistent output even on that small of a time scale, the necessary controls need to be designed in from the ground up, which is generally not the case with laser diode modules.
ou consulter les numéros d’autres pays
facile à utiliser
entrer les numéros de stock pour commencer
Copyright 2023 | Edmund Optics, Ltd Unit 1, Opus Avenue, Nether Poppleton, York, YO26 6BL, UK
L'entreprise Edmund Optics GmbH en Allemagne agit comme un mandataire d'Edmund Optics Ltd au Royaume-Uni. Le titulaire du contrat est Edmund Optics Ltd au Royaume-Uni.