The temporal coherence length of a laser will be greater if two wavelengths are very close to each other.

Here's why:

1. Temporal coherence refers to the phase correlation between waves at different moments in time. It is a measure of the average correlation between the value of a wave and itself delayed by τ at any arbitrary time.

2. The coherence length of a light source is inversely proportional to the spectral width (the range of wavelengths) of the light source. This means that a light source with a narrow spectral width (i.e., wavelengths that are very close to each other) will have a longer coherence length.

3. Therefore, if two wavelengths are very close to each other, the spectral width is narrow, and the coherence length is longer.

So, the correct answer is c. Two wavelengths are very close to each other.

Question

The temporal coherence length of a laser will be greater if two wavelengths are very close to each other.

Here's why:

1. Temporal coherence refers to the phase correlation between waves at different moments in time. It is a measure of the average correlation between the value of a wave and itself delayed by τ at any arbitrary time.

2. The coherence length of a light source is inversely proportional to the spectral width (the range of wavelengths) of the light source. This means that a light source with a narrow spectral width (i.e., wavelengths that are very close to each other) will have a longer coherence length.

3. Therefore, if two wavelengths are very close to each other, the spectral width is narrow, and the coherence length is longer.

So, the correct answer is c. Two wavelengths are very close to each other.

Knowee AI · Accepted Answer

The temporal coherence length of a laser will be greater if two wavelengths are very close to each other.

Here's why:

1. Temporal coherence refers to the phase correlation between waves at different moments in time. It is a measure of the average correlation between the value of a wave and itself delayed by τ at any arbitrary time.

2. The coherence length of a light source is inversely proportional to the spectral width (the range of wavelengths) of the light source. This means that a light source with a narrow spectral width (i.e., wavelengths that are very close to each other) will have a longer coherence length.

3. Therefore, if two wavelengths are very close to each other, the spectral width is narrow, and the coherence length is longer.

So, the correct answer is c. Two wavelengths are very close to each other.

The temporal coherence length of a laser will be greater ifa.One of the wavelengths is average of the other twob.The difference between the 2 wavelengths is largerc.Two wavelengths are very close to each other

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