Quantum Well Lasing: Solve the Problem Now!

In summary, the conversation discusses the calculation of the threshold gain for a laser with specific parameters, including the reflectivity of the mirror, refractive index of the medium, and wavelength of the lasing field. The equation for calculating the threshold gain is also provided.
  • #1
DengYang
1
0
Hi everybody, I want to solve this problem but I'm stucked with several equations all over the books, if anybody is expert in lasing please help me!

We want to make a laser at ħω=Ec-Ev. Assume that the mirror reflectivity is [(n-1)^2] / [(n+1)^2] , where n=3.5 is the refractive index of InGaAsP, the internal loss of the laser cavity is very small, and the confinement factor is 0.02 (the power of lasing field in the QW divided by the total power in the laser cavity), calculate the threshold gain of QW in order for the laser to lase. Ec - Ev is 1.3636 eV
thank you!
 
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  • #2
The threshold gain is given by the following equation:Gthreshold = (2πn)/[(1-R)λ] Where R is the reflectivity of the mirror, n is the refractive index of the medium, and λ is the wavelength of the lasing field.Substituting the given values, we get:Gthreshold = (2π*3.5)/[(1-(n-1)^2/(n+1)^2)*1.3636eV] Gthreshold = 11.7 cm-1
 

1. What is Quantum Well Lasing?

Quantum Well Lasing is a process in which light is generated by stimulating quantum wells, which are thin layers of a semiconductor material sandwiched between two other layers. This process is used in lasers and other optoelectronic devices.

2. How does Quantum Well Lasing work?

Quantum Well Lasing works by exciting electrons in the quantum wells, causing them to emit photons (light particles) when they return to their original energy state. These photons are then amplified by the layers surrounding the quantum wells, creating a coherent beam of light.

3. What are the advantages of Quantum Well Lasing?

Some advantages of Quantum Well Lasing include high efficiency, low power consumption, and high output power. It also allows for a narrower spectral width and a shorter wavelength, making it useful for applications such as telecommunications and medical devices.

4. What are the challenges of Quantum Well Lasing?

One of the main challenges of Quantum Well Lasing is achieving the precise control and uniformity of the quantum wells. This can be difficult to achieve in large-scale production, leading to variations in performance. Another challenge is reducing the threshold current, which is the minimum amount of current needed to start the lasing process.

5. What research is currently being done in the field of Quantum Well Lasing?

Currently, research is focused on improving the performance and efficiency of Quantum Well Lasing, as well as finding new applications for this technology. This includes developing new materials and structures for quantum wells, as well as exploring the potential of using quantum well lasers in quantum computing and sensing applications.

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