Related Experiment Video
Updated: Feb 25, 2026

12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
22.6K
Mode conversion efficiency to Laguerre-Gaussian OAM modes using spiral phase optics.
Optics Express
|August 10, 2017
Summary
This study presents a model for converting laser light into specific Laguerre-Gaussian (LG) modes using spiral phase optics. Optimization reveals an ideal beam waist ratio for efficient conversion, depending on the output mode
Area of Science:
- Optical physics
- Laser beam shaping
- Quantum optics
Background:
- Laguerre-Gaussian (LG) modes are crucial for applications requiring orbital angular momentum.
- Spiral phase optics are key elements for generating LG modes.
- Efficient mode conversion is essential for advanced optical systems.
Purpose of the Study:
- To develop an analytical model for conversion efficiency from TEM00 to arbitrary LG modes.
- To investigate the impact of non-ideal spiral phase optics on conversion efficiency.
- To analyze the effects of laser bandwidth on mode conversion.
Main Methods:
- Analytical modeling of light propagation and mode transformation.
- Incorporation of spiral phase optics with varying topological charges and structures.
- Analysis of beam waist ratios and their influence on conversion efficiency.
Main Results:
- An analytical model for TEM00 to LG mode conversion efficiency was established.
- The model accounts for stepped and non-integer topological charge spiral phase optics.
- Broad laser bandwidth was found to reduce conversion efficiency.
- An optimal input/output beam waist ratio was identified, dependent on the azimuthal mode number.
Conclusions:
- The developed model accurately predicts LG mode conversion efficiency.
- Optimized beam parameters are critical for maximizing conversion efficiency.
- The findings are relevant for designing efficient optical systems utilizing LG modes.
More Related Videos
Related Concept Videos
Angular Momentum
851
Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
851
Angular Momentum about an Arbitrary Axis
480
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
480
Conservation of Angular Momentum
16.3K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
16.3K
Conservation of Angular Momentum: Application
12.4K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
12.4K
Angular Momentum: Single Particle
7.9K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
7.9K
Kepler's Second Law of Planetary Motion
5.4K
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
5.4K

