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2. Laser rangefinder - Wikipedia

   en.wikipedia.org/wiki/Laser_rangefinder

   Laser rangefinder: Bosch GLM 50 C. Laser rangefinders are also used in several industries like construction, renovation and real estate as alternatives to tape measures, and was first introduced by Leica Geosystems in 1993 in France. To measure a large object like a room with a tape measure, one would need another person to hold the tape at the ...

3. Self-mixing interferometry - Wikipedia

   en.wikipedia.org/wiki/Self-mixing_interferometry

   Set-up of a self-mixing interferometer with laser diode and monitor photodiode. Self-mixing or back-injection laser interferometry is an interferometric technique in which a part of the light reflected by a vibrating target is reflected into the laser cavity, causing a modulation both in amplitude and in frequency of the emitted optical beam.

4. Thermopile laser sensor - Wikipedia

   en.wikipedia.org/wiki/Thermopile_laser_sensor

   Figure 2: [8] Working principle of a thermal laser sensor (Adapted from figure 3 with permission) As shown in Fig 2, a thermopile laser sensor consists of several thermocouples connected in series with one junction type (hot junction at temperature T 1) being exposed to an absorption area and the other junction type (cold junction at temperature T 2) being exposed to a heat sink.

5. Laser beam profiler - Wikipedia

   en.wikipedia.org/wiki/Laser_beam_profiler

   Far-field measurement: It is important to know the beam profile of a laser for laser radar or free-space optical communications at long distances, the so-called "far-field". The width of the beam in its far-field determines the amount of energy collected by a communications receiver and the amount of energy incident on the ladar's target.

6. M squared - Wikipedia

   en.wikipedia.org/wiki/M_squared

   In laser science, the parameter M 2, also known as the beam propagation ratio or beam quality factor is a measure of laser beam quality. It represents the degree of variation of a beam from an ideal Gaussian beam. [1] It is calculated from the ratio of the beam parameter product (BPP) of the beam to that of a Gaussian beam with the same wavelength.

7. Frequency-resolved optical gating - Wikipedia

   en.wikipedia.org/wiki/Frequency-resolved_optical...

   Frequency-resolved optical gating (FROG) is a general method for measuring the spectral phase of ultrashort laser pulses, which range from subfemtosecond to about a nanosecond in length. Invented in 1991 by Rick Trebino and Daniel J. Kane, FROG was the first technique to solve this problem, which is difficult because, ordinarily, to measure an ...