0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
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
How the light Law of Reflection works on the reflector?
there is a light of incidence and reflaction.... haha bisspuxi
What is it called when a wave goes from one medium to another and it changes speed and direction?
The change in direction is called refraction.
The bending of waves due to a change in speed is?
It is Refraction
What do you called when the light bends as it enters a different medium the process is known as?
Refraction ~ look to related link below .
Is twinkling of stars caused by reflaction?
twinkling of stars is caused by refraction
What is the angle of incidence in an optically dense medium for which the angle of reflaction is 90 degrees?
Unfortunately, the word "reflaction" is one character different from reflection and refraction. It is not possible to determine which you meant.
Explain the law of reflaction using a diagram?
Unfortunately, reflaction is one letter away from reflection and refraction, two different properties of light and other electromagnetic radiation. The two phenomena have different properties, and their diagrams would be different.
What is reflaction?
something that observe light
What is it refferd to when a diamond shine?
reflaction
What to do means by the reflaction light and why this occuor?
explain motion?
Does reflected mean transferred?
Reflected can be call as transferred, But it is not transferred because reflaction is a process in which light, heat or sound hits a surface of reflaction and changes its directionafter hitting.
What is coherent radiation in spectrometric methods?
There are two types of coherence time and space coherence. Time coherence means that the wave phase stays constant in time. Space coherence is when the wave phase is a constant when light travels in space. Both are really important and can be found in lasers and other sources of electromagnetic radiation.
Is coherence unified?
coherence in sentance
What are the four important standards for developing an effective essay?
Unity, support, coherence, and sentence skills.
How can you put coherence in a sentence?
The coherence of the party made me in confusion as whom to vote. This is an example of coherence in a sentence.
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
