Can two independent monochromatic light sources be coherent?

Can two independent monochromatic light sources be coherent?

Two sources are monochromatic if they have the same frequency and wavelength. Since they are independent, i.e. they have different phases with irregular difference, they are not coherent sources.

Can you have 2 independent monochromatic?

(a)(i) Two independent monochromatic sources of light cannot produce a sustained interference because: (1) If the sources are not coherent, they cannot emit waves continuously. (2) Independent sources emit the waves, which don’t have the same phase or a constant phase difference.

Can 2 independent sources of light be coherent?

The two independent sources cannot be coherent because of the fact that independent sources cannot maintain a constant phase difference between them. For experimental purposes, two virtual sources obtained from a single parent source can act as coherent.

Is monochromatic light coherent?

Coherent light must have the same phase as well as the same frequency. Monochromatic light only has to have the same frequency. A coherent source is always monochromatic but a monochromatic source may or may not be a coherent source.

Why monochromatic light is used in diffraction?

Monochromatic light ensures that the light is a single pure frequency. This ensures the peaks are equally spaced. Coherent light ensures all of the photons are in phase. This means for a single frequency all of the peaks and troughs will be lined up.

Does monochromatic light diffract?

Yes. When monochromatic light is refracted, it remains monochromatic. Similarly, a diffraction grating doesn’t reveal a spectrum. But technically diffraction occurs, as the direction of the light is changed.

What is the difference between monochromatic light and white light?

Monochromatic means that all of the light produced by the laser is of a single wavelength. White light is a combination of all visible wavelengths (400 – 700 nm). Coherent means that the waves of light are in phase with each other. A light bulb produces many wavelengths, making it incoherent.

What happens if white light is used in place of monochromatic light?

When we use white light in place of monochromatic light then only central fringe looks white and other fringes of different colour are observed. It is becaused central fringe for all the colours are formed at central point so it becomes white after mixiing up.

What kind of light is a laser?

Laser stands for Light Amplification by the Stimulated Emission of Radiation. One basic type of laser consists of a sealed tube, containing a pair of mirrors, and a laser medium that is excited by some form of energy to produce visible light, or invisible ultraviolet or infrared radiation.

Why is white light not monochromatic?

White light consists of different colors of light with different wavelength. Tthus it is a polychromatic light, not a monochromatic light.

Why monochromatic light is used in interferometry instead of white light?

The closer to monochromatic you get, the less fussy you have to be about getting the lengths of the arm exactly equal to see clear interference. Basically you need to get within about one Coherence length, which could be a wavelength or two for white light to many kilometers for a good laser.

Is white light a monochromatic source of light?

White light is not monochromatic as essentially it is made up of a number of colours. They are separated as the angle to which the light refracts is dependent upon the wavelength of the light. Note: Wavelength/frequency determines the colour we see.

Does white light contains single Colour or more?

Colours like red or violet contain only a single wavelength light. But unlike them, white light contains all wavelengths of light. That means white is a mixture of all visible colours.

What is the difference between normal light and laser?

Normal light is divergent and incoherent whereas laser light is highly directional and coherent. Normal light is a mixture of electromagnetic waves having different wavelengths. Laser light, on the hand, is monochromatic. This is the main difference between Normal light and laser light.

Can you turn an LED into a laser?

The short answer is an LED can not be converted into a laser diode. While the LED and Laser share similar manufacturing processes and materials, they have different optical properties. The LED is an extended source while the Laser diode is a point source.

What element is the active part of a ruby laser?

The active part of the ruby is the dopant, which consists of chromium ions suspended in a synthetic sapphire crystal. The dopant often comprises around 0.05% of the crystal, and is responsible for all of the absorption and emission of radiation.

How can we identify spontaneous and stimulated emission processes?

Spontaneous emission takes place without interaction with other photons, and the direction and phase are random. Stimulated emission takes place when the excited electron interacts with another photon.