- Is a laser faster than light?
- Which color laser is the strongest?
- How far will a green laser pointer go?
- Can a laser pointer reach the moon?
- Which is more powerful red or green laser?
- Do lasers go on forever?
- How far can a 1000mW green laser go?
- Why are yellow lasers so expensive?
- Are Lasers bad for your eyes?
- Why are green lasers more expensive than red?
- What is the advantage of a green laser over a red laser?
- Is green laser more dangerous than red?
Is a laser faster than light?
One of the most sacred laws of physics is that nothing can travel faster than the speed of light in vacuum.
But this speed limit has been smashed in a recent experiment in which a laser pulse travels at more than 300 times the speed of light (L J Wang et al.
2000 Nature 406 277)..
Which color laser is the strongest?
green lasersAs a general rule, green lasers are 532nm are 5-7X brighter than any other laser color, at the same power. Whether blue, red, purple/violet, or a light color like yellow, green is the best at strength for visibility.
How far will a green laser pointer go?
The diagram below shows the hazard distances for a 5 milliwatt “U.S. legal” green laser pointer with a 1 milliradian beam divergence: It is a potential eye hazard from the pointer to about 52 feet. It is a temporary flashblindness hazard from the pointer, out to about 260 feet.
Can a laser pointer reach the moon?
The new moon is darker, making it easier to see our lasers. … The typical red laser pointer is about 5 milliwatts, and a good one has a tight enough beam to actually hit the Moon—though it’d be spread out over a large fraction of the surface when it got there.
Which is more powerful red or green laser?
To the human eye, a green laser will appear four times as bright as a red laser at the same power output based on the human eyes’ light sensitivity.
Do lasers go on forever?
The light from a laser in space would continue on forever unless it hit something. However, if you were far enough away, you wouldn’t be able to detect the light. A projectile would also continue on forever unless it hit something. Lasers produce light that can be tightly focused.
How far can a 1000mW green laser go?
10 milesThe range and visible distance of any laser will depend on a few different factors. Output power ( mw ) – A 200mW laser will be visible for more than 1 miles while a 1000mW laser pointer or more will also be visible for 10 miles.
Why are yellow lasers so expensive?
The yellow laser pointer are expensive because they are made with high quality components built using cutting edge laser technology. A very high power diode is needed to make a very low power yellow laser. … This is done by laser diodes into crystal and optical arrays to achieve a broader range of spectral lasing.
Are Lasers bad for your eyes?
LASER POINTER shines into the camera lens. Eye damage from a pocket laser is unlikely, but could be possible under certain conditions. Red laser pointers that are “properly labeled” in the 3-5 mW range have not caused eye damage — no retinal damage has been reported — but there are very real concerns.
Why are green lasers more expensive than red?
Why is a green laser more expensive than a red? … Green lasers are not cheap they have extra parts like a 808 diode, a frequency-doubling crystal and a second infrared laser crystal. This is why they are time consuming to build and expensive.
What is the advantage of a green laser over a red laser?
In very bright conditions — such as at the range on a clear, sunny day — a green laser sight will be more visible on target than a red laser sight. Green light offers less of an advantage over red light in dim conditions.
Is green laser more dangerous than red?
Green is more easily perceived by the eye and the beam is visible along its path. But green lasers are also more dangerous. Green is more easily absorbed by the retina than red, so it requires less exposure to cause damage.