Introduction
As a supplier of 808nm Single Bar Diode Lasers, I often encounter inquiries from clients seeking a comprehensive understanding of various technical parameters, one being the divergence angle. The divergence angle is a crucial characteristic that significantly influences the performance and application scope of 808nm Single Bar Diode Lasers. In this blog post, I aim to delve into what the divergence angle of an 808nm Single Bar Diode Laser is, its importance, factors affecting it, and how to manage it for optimal results. 808nm Single Bar Diode Laser
Understanding the Divergence Angle
The divergence angle of a laser beam refers to the angle at which the laser beam spreads out as it travels away from the laser source. In the context of an 808nm Single Bar Diode Laser, the divergence angle describes how quickly the width of the laser beam increases over distance. It is typically measured in milliradians (mrad) and is characterized in two principal planes: the fast axis and the slow axis.
The fast axis divergence angle is generally much larger than the slow axis divergence angle. In an 808nm Single Bar Diode Laser, the active region of the diode is very thin in the vertical direction, which causes the laser light to diffract more rapidly in this plane. As a result, the fast axis divergence angle can be as large as 30 – 60 degrees, which is equivalent to approximately 520 – 1050 mrad. On the other hand, the slow axis divergence angle is smaller because the width of the active region in the horizontal direction is relatively large, resulting in less diffraction. The slow axis divergence angle usually ranges from 5 – 10 degrees, or about 87 – 175 mrad.
Importance of the Divergence Angle
The divergence angle plays a vital role in determining the suitability of an 808nm Single Bar Diode Laser for different applications. Here are some key aspects where the divergence angle has a significant impact:
Beam Quality
A smaller divergence angle indicates better beam quality. A laser beam with low divergence can maintain a relatively small spot size over a longer distance, which is essential for applications that require high precision, such as laser cutting, welding, and micromachining. In these applications, a focused laser beam with a small divergence can deliver a high energy density to a specific area, enabling efficient and accurate processing.
Propagation Distance
The divergence angle affects how far the laser beam can travel while still maintaining a useful intensity. A laser with a large divergence angle will spread out quickly, causing the intensity of the beam to decrease rapidly with distance. This limits the effective propagation distance of the laser. In contrast, a laser with a small divergence angle can maintain a higher intensity over a longer distance, making it suitable for long – range applications such as laser ranging and free – space optical communication.
Coupling Efficiency
When coupling the laser beam into an optical fiber or other optical components, the divergence angle is a critical factor. A large divergence angle can make it difficult to couple the laser beam into a small – core optical fiber, resulting in low coupling efficiency. By reducing the divergence angle, the coupling efficiency can be improved, which is important for applications such as fiber – coupled laser systems used in medical and industrial applications.
Factors Affecting the Divergence Angle
Several factors can influence the divergence angle of an 808nm Single Bar Diode Laser:
Active Region Geometry
As mentioned earlier, the geometry of the active region of the diode laser has a significant impact on the divergence angle. The thinness of the active region in the vertical direction leads to a large fast axis divergence angle, while the width in the horizontal direction affects the slow axis divergence angle. Manufacturers can optimize the design of the active region to control the divergence angle to some extent.
Temperature
Temperature can also affect the divergence angle of a diode laser. As the temperature increases, the refractive index of the semiconductor material in the active region changes, which can cause the divergence angle to increase. This is known as the thermal lensing effect. To minimize the impact of temperature on the divergence angle, proper heat management techniques, such as using heat sinks and thermoelectric coolers, are often employed.
Mode Structure
The mode structure of the laser beam can influence the divergence angle. In a multi – mode laser, different modes have different propagation constants, which can cause the beam to diverge more rapidly compared to a single – mode laser. Single – mode 808nm Single Bar Diode Lasers typically have a smaller divergence angle and better beam quality.
Controlling the Divergence Angle
To meet the requirements of different applications, it is often necessary to control the divergence angle of an 808nm Single Bar Diode Laser. Here are some common methods:
Collimation
Collimation is the process of making a divergent laser beam parallel. This is typically achieved using a collimating lens. A collimating lens can reduce the divergence angle of the laser beam, making it more suitable for long – range applications or for coupling into optical fibers. By carefully selecting the appropriate collimating lens, the divergence angle can be adjusted to the desired value.
Beam Shaping
Beam shaping techniques can also be used to control the divergence angle. For example, cylindrical lenses can be used to correct the large divergence in the fast axis and make it more similar to the slow axis divergence. This can improve the overall beam quality and make the laser more versatile for different applications.
Applications of 808nm Single Bar Diode Lasers with Controlled Divergence Angle
With the ability to control the divergence angle, 808nm Single Bar Diode Lasers find a wide range of applications:
Medical Applications
In medical applications such as laser therapy and surgical procedures, 808nm Single Bar Diode Lasers with a well – controlled divergence angle are used. A focused laser beam with a small divergence can be precisely delivered to the target tissue, minimizing damage to the surrounding healthy tissue. For example, in laser hair removal, the laser beam needs to be focused on the hair follicles without causing excessive damage to the skin.
Industrial Applications
In industrial applications such as laser cutting and welding, an 808nm Single Bar Diode Laser with a small divergence angle can provide a high – energy density beam for efficient processing. The ability to maintain a small spot size over a certain distance allows for precise cutting and welding of various materials, including metals and plastics.
Optical Pumping
808nm Single Bar Diode Lasers are widely used as pump sources for other lasers, such as solid – state lasers. By controlling the divergence angle, the laser beam can be efficiently coupled into the gain medium of the pumped laser, improving the overall performance and efficiency of the laser system.
Conclusion
In conclusion, the divergence angle of an 808nm Single Bar Diode Laser is a crucial parameter that affects its performance and application scope. Understanding the concept of the divergence angle, its importance, factors affecting it, and methods of control is essential for both suppliers and users of these lasers. As a supplier of 808nm Single Bar Diode Lasers, we are committed to providing high – quality products with well – controlled divergence angles to meet the diverse needs of our clients.
F-Mount If you are interested in our 808nm Single Bar Diode Lasers or have any questions regarding the divergence angle or other technical parameters, please feel free to contact us. We are more than happy to engage in detailed discussions and provide solutions tailored to your specific requirements.
References
- Adams, A. R. (Ed.). (2009). Handbook of Optoelectronics. Taylor & Francis.
- Szipöcs, R., & Fülöp, J. (2006). Diode Lasers and Photonic Integrated Circuits. Wiley – Interscience.
- Koechner, W. (2006). Solid – State Laser Engineering. Springer.
Hangzhou Brandnew Technology Co., Ltd.
Hangzhou Brandnew Technology Co., Ltd. is one of the leading 808nm single bar diode laser manufacturers and suppliers in China, has a professional factory which manufacturers high quality 808nm single bar diode laser and sells at competitive price. Welcome to wholesale our products made in China.
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