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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 else can I help you with?
Are there any lasers that can cut through metal?
Yes, there are lasers specifically designed to cut through metal. Fiber lasers and CO2 lasers are commonly used in metal cutting applications due to their high power and precision. These lasers are capable of cutting through various types of metals with different thicknesses.
How has lasers evolved over time?
Lasers have evolved over time in terms of increased power and precision, allowing for applications in various fields such as medicine, communication, and manufacturing. Advances in technology have led to the development of new types of lasers, such as fiber lasers and diode lasers, which are more efficient and versatile. Additionally, the miniaturization of lasers has enabled their integration into devices such as smartphones and laptops.
What are the types of pumping in lasers?
A laser emits a beam of energy in the form of light. But to get energy out of a laser, we have to put some in. Depending on the type of laser, there are different ways to do this. What is important here is that the energy put into the lasing medium, the energy that is pumped into that medium to stimulate it, to excite it (the actual term), to induce it to lase, is supplied by an outside source, by a pump appropriate to that type of laser. So the pump, that thing outside the medium that stimulates it to induce it into lasing, is pumping when it is exciting the medium. Hope this was, um, coherent....
Can lasers reflect and refract like any light?
YesLASER stands for light amplification by stimulated emission of radiation, which means that it is light that is amplified.Since it is still light it can reflect and retract, although I'm not sure if it can be broken up into the spectrum like normal light.
What are the different types of lenses?
Some common types of camera lenses include prime lenses, which have a fixed focal length; zoom lenses, which have variable focal lengths; wide-angle lenses, which capture a broader field of view; telephoto lenses, which magnify distant subjects; and macro lenses, which allow for close-up photography.
What can be used for different types of surgery.?
its not lasers are Diffractions it is refractions
Are there any lasers that can cut through metal?
Yes, there are lasers specifically designed to cut through metal. Fiber lasers and CO2 lasers are commonly used in metal cutting applications due to their high power and precision. These lasers are capable of cutting through various types of metals with different thicknesses.
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.
What are the types of trapezuim?
A trapezium or a trapezoid has one pair of parallel sides of different lengths but an isosceles trapezium also has one pair of parallel sides of different lengths but its sloping sides are equal in length.
What are the different types of tuning in tunable laser?
Tunable lasers can be tuned in various manners. Some of these include single line and multi line tuning. Narrow band tuning is also used to tune various lasers as well.
How does laser skin resurfacing work?
This is a relatively new treatment that works by using 2 different types of lasers. The lasers are short beams of light that eliminates the top layer of skin, thereby destroying the damaged skin cells.
How can I determine the appropriate razor number lengths for different hair types and styles?
To determine the appropriate razor number lengths for different hair types and styles, consider the thickness and texture of the hair. Thicker hair may require longer razor number lengths, while finer hair may need shorter lengths. Additionally, the desired style or haircut will also influence the choice of razor number length. Experimenting with different lengths and consulting with a professional stylist can help you find the best razor number length for your hair type and desired style.
What are the recommended blade lengths for different types of haircuts?
The recommended blade lengths for different types of haircuts vary, but generally, shorter blade lengths like 1 or 2 are used for buzz cuts or very short styles, while longer blade lengths like 4 or 5 are used for longer styles or fades. It's important to consult with a professional hairstylist for personalized recommendations based on your hair type and desired look.
What type of lasers does Erchonia manufacture?
Since the early 1970s Erchonia lasers have been classified by wavelength and maximum output powers into four classes. The lasers are used in treatment of neck and shoulder pain, breast augmentation, acne, laser assisted body augmentation. The types of lasers they use for these treatments include 3LT Lasers, Custom Design Lasers and Zerona Lasers.
What does it mean to vary sentence structure?
It would mean to have different types and lengths of sentences, some short and some long sentences.
How has lasers evolved over time?
Lasers have evolved over time in terms of increased power and precision, allowing for applications in various fields such as medicine, communication, and manufacturing. Advances in technology have led to the development of new types of lasers, such as fiber lasers and diode lasers, which are more efficient and versatile. Additionally, the miniaturization of lasers has enabled their integration into devices such as smartphones and laptops.
What measure instantaneous speed?
Your speedometer! It tells you how fast you are going at that instant.All different types of devices are used to measure instantaneous velocity including chronographs, lasers, and radars.
