Wavefront sensors: the ultimate optical diagnostic tool?

Characterizing a laser beam is a growing concern in the industry. A great number of instruments are available on the market, each with their specialities. Continue reading…

 

What are NEP and SNR?

Comparing detector noise specifications

After having explained the causes of optical noise in detectors, I’d like in this post to define the parameters that makes it possible to compare detectors noise specifications. Continue reading…

 

Noise in photodetectors (Shot noise)

[hmtad name=”Adsense Unit 3″ align=”center”][hmtad name=”Adsense Unit 3″ align=”center”]After my recent post on power and energy meters, I’d like to speak about the different kind of noises that affect a photodetector and how to model them. Continue reading…

 

Buying a laser power meter: check-list

Because of the wide range of power and energy meter available on the market, and even more because they tend to be not totally versatile, you need to carefully examine your needs against the capabilities of the instrument you are planning to acquire. Continue reading…

 

A short review of laser power and energy measurement devices

The base of laser beam diagnostic is to know how much average power you got. Available off the shelves form different manufacturers are three main type of devices, based either on a photodiode, a thermopile or a pyroelectric detector. Continue reading…

 

Peak-to-valley Vs RMS

[hmtad name=”Adsense Unit 2″ align=”center”][hmtad name=”Adsense Unit 2″ align=”center”]What is an optic surface figure?

The surface figure, or surface quality or surface cosmetics all refer to the deviation between an actual optic and its ideal surface. There are basically two set of information that are commonly given by manufacturers: the surface flatness and what is referred to as “scratch-dig”. Continue reading…