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What are the coherence lengths of the different types of lasers?
Fiber optic lasers can have coherence lengths greater than 100 km. Helium-neon lasers can produce light with coherence lengths greater than 5 m but 20 cm is typical. Laser diode chips are a fraction of a mm on a side and so coherence lengths on that order are expected, however some of the cheapest laser pointers can produce coherence lengths of 20 cm for short intervals of time and have been used to create holograms. In general the length depends on many variables. The typical red light laser diode (λ= 650 nm) with a frequency stabilizer can have a coherence length of over 1 m. LEDs have a spectra width Δλ of about 50 nm, and may have a coherence length of 10's to 100's of μms. As a side note, because the exited states of the atoms in a tungsten filament are short lived, the coherence length is only a few micrometers (μm). Some notes about coherence lengths: Interference is only visible if the coherence length of the light is at least as long as the path-length difference that creates the interference. Spectral width in optics is related to coherence length by the formula L = λ²/(nΔλ) where λ is the central wavelength, n is the index of refraction and Δλ is the spectral width. The coherence time is the above coherence length divided by the light's phase velocity in the medium or.. τ = λ²/(cΔλ) Refer to the Related link below for Wikipedia's article on coherence length
Is it possible to have coherence between light sources emiting light of different wavelengths?
I don't think so. Coherence is defined for light of a single wavelength.
What is a laser light with holograph?
a laser light with a holograph is a laser light with holograph.
How did young achieve the condition of phase coherence in young double slit experiment?
In Young type double slit experiment, two phase coherent spherical waves are created by passing a plane wave (e.g. laser light)
Difference between laser and torch light?
laser light rays don't spread and torch light ray's do
What light property you can measure to estimate a light wave's temporal coherence and spatial coherence?
It is the phase, which can be measuerd with these type of coherence.
Properties of laser?
Laser has certain unique properties, namely, mono-chromatic, coherence and directionality, compared to ordinary sources of light. The most important property of laser light is that it can be precisely collimated into a parallel beam.
What are the coherence lengths of the different types of lasers?
Fiber optic lasers can have coherence lengths greater than 100 km. Helium-neon lasers can produce light with coherence lengths greater than 5 m but 20 cm is typical. Laser diode chips are a fraction of a mm on a side and so coherence lengths on that order are expected, however some of the cheapest laser pointers can produce coherence lengths of 20 cm for short intervals of time and have been used to create holograms. In general the length depends on many variables. The typical red light laser diode (λ= 650 nm) with a frequency stabilizer can have a coherence length of over 1 m. LEDs have a spectra width Δλ of about 50 nm, and may have a coherence length of 10's to 100's of μms. As a side note, because the exited states of the atoms in a tungsten filament are short lived, the coherence length is only a few micrometers (μm). Some notes about coherence lengths: Interference is only visible if the coherence length of the light is at least as long as the path-length difference that creates the interference. Spectral width in optics is related to coherence length by the formula L = λ²/(nΔλ) where λ is the central wavelength, n is the index of refraction and Δλ is the spectral width. The coherence time is the above coherence length divided by the light's phase velocity in the medium or.. τ = λ²/(cΔλ) Refer to the Related link below for Wikipedia's article on coherence length
What is a super luminescent diode?
With their emission properties Superluminescent Light-Emitting Diodes (SLEDs) are closing the gap between Laser Diodes (LDs) and Light Emitting Diodes (LEDs).They offer the broadband optical spectra of LEDs and the spatial coherence of LDs. Compared to Laser Diodes and LEDs, SLEDs can be understood as • Spatial coherent broadband laser diodes with a beam-like output • Temporal incoherent laser diodes with a broadband spectrum • Speckle-free laser diodes with a short coherence length • Spatial coherent LEDs with a beam-like output
What radiation is used in a laser?
Gas Lasers is a kind of laser that sets free electric current over gas to carry out consistent light. Gas Lasers needs to have very high laser beams with extended coherence length.
Why laser beam is used for locating distant objects?
because laser is highly coherence and its angur spread is very small!
Is it possible to coherence between light sources emitting light of different wavelengths?
I don't think so. Coherence is defined for light of a single wavelength.
Is it possible to have coherence between light sources emiting light of different wavelengths?
I don't think so. Coherence is defined for light of a single wavelength.
Why does coherent light have a relatively constant intensity?
Coherence relates to the physics of waves. Specifically, it refers to a property that allows constant interference. Because interference varies the intensity of light, coherent light has a relatively stable intensity.
What is a laser light with holograph?
a laser light with a holograph is a laser light with holograph.
Why is the laser beam made of a light of a single colour?
The color of a beam of light is dependent on its wavelength. A laser will appear as one color because all the light being emitted from it is the same wavelength. This is also why lasers and laser pointers always have such a tight beam. By contrast, flashlights (which have much wider beams, and rely on mirrored interiors to amplify the light) have light at a variety of wavelengths, which is why the light is ultimately "colorless".
What truth theory is a property of a related group of constituent statements?
Coherence theory of truth
