How is the Bragg condition satisfied for AOMs in a double pass configuration?

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In summary, the conversation discusses the use of AOMs in a double pass configuration and the concept of changing the frequency of the incoming beam from ω to ω+Ω at an angle θB. The question arises on how the Bragg condition can be satisfied for the angle θB at both frequencies. The explanation is that Ω is typically much smaller than ω, so the angle remains essentially the same for both passes. The person asking the question expresses their initial confusion but is reassured by the explanation given by the expert.
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Niles
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Hi

I have a question on AOMs used in a double pass configuration. I understand the motivation for such a setup, but what I don't quite understand is the following: During the first pass, the frequency of the incoming beam is changed from ω to ω+Ω at an angle θB. Then we send the diffracted beam with frequency ω+Ω through the AOM once again at the same angle θB. This last part I don't quite undertand: How can the Bragg condition be satisfied for the angle θB at both ω and ω+Ω?


Niles.
 
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  • #2
I think the idea is that in general Ω << ω, so the correct angle is essentially the same for the second pass as for the first.
 
  • #3
Ah, I see. I thought it was most likely something like that, but I was worried that I had misunderstood something. Thanks for taking the time to reply.Niles.
 

FAQ: How is the Bragg condition satisfied for AOMs in a double pass configuration?

What is an acousto optical modulator (AOM)?

An acousto optical modulator is a device that uses sound waves to control the intensity, phase, or frequency of a laser beam. It is commonly used in laser applications such as laser communication, laser printing, and laser spectroscopy.

2. How does an AOM work?

An AOM works by using a piezoelectric transducer to convert electrical signals into sound waves. These sound waves then travel through an acousto-optic material, causing changes in the material's refractive index. This, in turn, affects the path of the laser beam passing through the material.

3. What are the advantages of using an AOM?

One of the main advantages of using an AOM is its fast response time, allowing for rapid modulation of the laser beam. AOMs also have a wide range of modulation capabilities, making them versatile for various applications. They also have a high extinction ratio, meaning they can effectively turn a laser beam on and off.

4. What are the limitations of AOMs?

One limitation of AOMs is their narrow bandwidth, which can limit their use in applications that require a wide range of frequencies. They also have limited power handling capabilities and can introduce noise into the laser beam. Additionally, AOMs may be sensitive to temperature and require careful alignment for optimal performance.

5. What are some common uses for AOMs?

AOMs are commonly used in laser applications such as laser printing, laser communication, and laser spectroscopy. They are also used in scientific research for experiments involving laser manipulation and control. Additionally, AOMs are used in medical devices for laser surgeries and treatments.

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