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In mathematical terms, circular polarization can be represented using complex exponentials. For an electromagnetic wave traveling in the z-direction, the electric field vector can be described as:

Circular polarization is employed in GPS technology to enhance signal reception and reduce the effects of multipath interference. By using circularly polarized signals, GPS receivers can maintain better accuracy and reliability, especially in urban environments where signals may reflect off buildings and other structures.

The choice between LHCP and RHCP has significant implications for the design and implementation of communication systems. When designing antennas and systems, engineers must consider factors such as:

In practical applications, antennas are designed to transmit and receive specific types of circular polarization. A left-hand circularly polarized antenna is optimized to transmit LHCP signals and will perform poorly when receiving RHCP signals, and vice versa. This characteristic is essential in applications such as satellite communications, where the polarization of the transmitted signal must match the polarization of the receiving antenna for optimal signal strength and clarity.

In more technical terms, if you imagine looking toward the source of a plane wave, the electric field vector will rotate in a counterclockwise direction. This is in contrast to right-hand circular polarization (RHCP), where the electric field vector rotates in a clockwise direction.

Ensuring compatibility between transmitting and receiving systems is crucial. If a system is designed to operate with LHCP, it will not effectively receive RHCP signals, and vice versa. This compatibility issue can lead to signal loss and degraded performance.

Circular polarization is also used in various other applications, such as wireless communication, radar systems, and medical imaging. In wireless communication, circular polarization can help reduce interference and improve signal quality. In radar systems, circular polarization can enhance target detection and reduce clutter. In medical imaging, circular polarization can improve image quality and reduce artifacts.

Circular polarization is a type of polarization in which the electric field vector of a wave rotates in a circular pattern as the wave propagates. Circular polarization is important in various applications because of its unique properties and advantages over other types of polarization.

However, I am not personally in love with the current state for gaming given how it feels like FoV is even more limited with pancake lenses than with current HMDs. The industry is regressing on FoV and that frustrates me. Would I give up some FoV to have pancake optics and the extra comfort? Perhaps. I might even be able to live with something like 130 horizontal in a form factor like the Arpara or the MeganeX if the rest of the features were compelling and good.

LHCP and RHCP can exhibit different propagation characteristics when interacting with the environment. For instance, when circularly polarized waves encounter obstacles or surfaces, they may reflect or refract differently based on their polarization. This can lead to variations in signal strength and quality, particularly in environments with multiple reflective surfaces, such as urban areas.

So I sincerely hope the upcoming Crystal or 12k allows me to keep seeing things this way. I also wish there is some way that they can adjust lens focus for people not having 20/20 vision. For me, a thinner face pad already did the trick.

When/where did they say that? I never saw that and I feel like I’ve checked out everything released so far pretty extensively. I haven’t seen diopter adjustment in anything except pancake lenses, I don’t really understand how you even could with fresnel or aspheric lenses.

Circular polarization is utilized in RFID systems, particularly for passive RFID tags. The use of circularly polarized signals allows for better reading angles and improved performance in environments where the orientation of the tags may vary. This is especially beneficial in applications such as inventory management and asset tracking.

As technology advances, the importance of circular polarization in communication systems is expected to increase, leading to new innovations and applications that exploit the unique properties of LHCP and RHCP. By utilizing the strengths of both types of circular polarization, engineers can develop communication systems that are more efficient, reliable, and high-performance, meeting the demands of an increasingly connected world.

12k will have “Bionic” lenses, so aspheric directly forward, then fresnel towards the edges. The processor on the HMD works with the Tobii eye tracking to correct distortion. It won’t be using Pancake lenses, this is just a discussion about tech that’s out in the world.

x^ and y^: These are the unit vectors in the x and y directions, respectively, defining the direction of the electric field components.

Right-circularly polarizedlight

Hum, let’s dream, what about a mix of both : a lens composed by a pancake for the center, mounted on a fresnel lens to cover the peripherical area of a wide fov ?

So I sincerely hope the upcoming Crystal or 12k allows me to keep seeing things this way. I also wish there is some way that they can adjust lens focus for people not having 20/20 vision. For me, a thinner face pad already did the trick.

Certain materials exhibit different interactions with left-hand and right-hand circularly polarized waves. For example, chiral materials, which have a non-superimposable mirror image, can selectively absorb or transmit LHCP or RHCP waves. This property can be harnessed in applications such as optical filters, sensors, and advanced communication systems.

At its core, a digital camera is a device that captures light and converts it into digital data. This data is then processed to create an image that can be ...

Stems from Pancake’s boucing of light within lens itself, resulting in low light efficiency. Problem of ghosting and is also a scourage for this lens. Also，the cost of Pancake is nearly 10 times higher than that of Fresnel lens

Circularpolarization example

Circular polarization is also widely used in radar systems, particularly in applications such as weather radar and ground-penetrating radar (GPR). The ability to transmit and receive both LHCP and RHCP signals enables radar systems to differentiate between various types of targets and improve detection capabilities.

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Before diving into the specifics of LHCP and RHCP, it is essential to understand what circular polarization is. Circular polarization occurs when the electric field vector of a wave rotates in a circular motion as the wave propagates. This rotation can occur in two directions: clockwise or counterclockwise. The direction of rotation determines whether the polarization is left-handed or right-handed.

Circularly polarizedlightanimation

These applications demonstrate the versatility and advantages of using circular polarization across various fields, enhancing communication, detection, and data transmission capabilities.

Well, maybe not quite entirely specifically unrelated, given one of the noteable features of recent headsets with pancake optics, such as the Arpara, has indeed been diopter adjustability. Don’t know whether you had noticed this, and this is what prompted your post, or not… :7

In wireless communication systems, particularly those involving multiple-input multiple-output (MIMO) technology, the use of circular polarization can improve the capacity and performance of the network. By employing both LHCP and RHCP signals, systems can take advantage of diversity gain, allowing for better signal quality and increased data throughput.

Circular polarization is also essential in RFID (Radio Frequency Identification) systems, particularly regarding RFID antennas. In these systems, the RFID reader, equipped with an antenna, transmits signals to the tags, which are also equipped with antennas. As the tags may move relative to the reader, the signals can experience a Doppler shift that can affect their polarization. Circular polarization is employed in RFID systems because it is less susceptible to the Doppler shift compared to linear polarization. This characteristic enhances the reliability and efficiency of communication between the RFID antenna of the reader and the antennas of the tags.

Is the pancake lens approach inherently incapable of or disadvantaged for wide FOV? Or is it merely that early incarnations of them have relatively narrow FOV?

Another thing I wonder about pancake lenses. If they have poor light transmittance, does that mean they heat up? The energy from the lost light has to be going somewhere. But maybe it’s not enough energy in total to matter.

Crystal specs do claim a 7 diopter adjustment range; I don’t recall anything about whether this range starts in the negatives, or if that is only plus 0-7… I wondered a bit whether the diagonal flange on the eyetubes, in the parts pictures that were posted the other day, were part of the adjustment mechanism in any way, but who knows – the tubes themselves look to be completely rigid…

Left-hand circular polarization (LHCP) is a type of electromagnetic wave polarization where the electric field vector rotates in a counterclockwise direction as it propagates away from the source. This rotation occurs when viewed from a point along the direction of wave propagation.

In this case, the phase difference between the x and y components is +π/2​. This causes the electric field vector to rotate clockwise when viewed from the receiving end.

The biggest benefit of pancake lenses is comfort. To be totally honest, the 12K looks perfect in everyway except this one point. The current fresnel form factor is going to look like like those giant cellphones from the early 90s.

Miniaturized integrated lens array configurations. Microlens arrays contain multiple microlenses (small lenses – diameter ranging from 1mm to 10µm) formed in a ...

The concepts of left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) are essential in the study of electromagnetic waves and have significant implications in various applications such as satellite communications, wireless networks, radar systems, and optics. Understanding the differences, characteristics, and applications of LHCP and RHCP is crucial for engineers and researchers working in these fields.

Sorry to put in a point that’s not really related to Pancake Lens, but just the lens. Most headsets today are designed for the 20/20 vision people, which I found really strange. How many people here actually have 20/20 vision? Why headsets are not more accommodating for near or far-sighted people? You know, there will be way way more distortion and ghosting if I have to put my glasses on top of the lens, and the glasses will make the VR experience much worse. In the early days of VR, some headset’s lens actually can be adjusted forward and backward, which helps my near-sighted problem, but today after trying Pimax, HP G2, and Meta Quest 2, I’d say the most concerning issue for me is “can I see clearly without eyeglasses in my headset”? Pancake, aspheric or Fresnel makes no difference when I have to wear the glasses within the headset. It will be bad anyway. For some reason, when wearing my Pimax 5K Super, I can see things comparably clearly without my glasses, and that’s a huge plus for me. And this is why Pimax headset is my favorite: I can see super-wide pictures with my bare eyes ! The screen-door effect is just a tiny problem. So I sincerely hope the upcoming Crystal or 12k allows me to keep seeing things this way. I also wish there is some way that they can adjust lens focus for people not having 20/20 vision. For me, a thinner face pad already did the trick.

Polarization is an important concept in the study of electromagnetic waves, especially in radio frequency and optics. It determines how waves travel and interact with materials. One type of polarization, circular polarization, is particularly interesting due to its unique properties and applications. Circular polarization can be divided into two types: left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). In this article, we will explore the differences, characteristics, applications, and implications of LHCP and RHCP.

The most fundamental difference between LHCP and RHCP lies in the direction of the electric field vector’s rotation. LHCP rotates counterclockwise, while RHCP rotates clockwise when viewed from the perspective of the wave’s propagation. This difference is crucial when considering how these polarizations interact with various materials and antennas.

In telemetry systems, which involve the transmission of data from remote or inaccessible points to receiving equipment, circular polarization can improve signal integrity. By utilizing circularly polarized signals, telemetry systems can achieve better performance in environments with high levels of interference or multipath propagation, ensuring accurate data transmission.

Circularly polarizedlightequation

I guess one thing that might slightly reduce the comfort gain, is that the screens need to be brighter, in order to compensate for the loss in the lens train, which strikes me as likely to mean more heat, closer to the face… :7

Implementing both LHCP and RHCP in a communication system can increase complexity. While using both polarizations can enhance performance, it also requires more sophisticated antenna designs and signal processing techniques, which may elevate costs and design challenges.

In optics, circular polarization is used in various applications, including optical communication, imaging systems, and 3D displays. The manipulation of circularly polarized light can enhance contrast and reduce glare in imaging systems while also enabling advanced techniques such as optical trapping and manipulation.

– Left-hand Circular Polarization (LHCP): The electric field vector rotates counterclockwise when viewed from the receiving end. It can be represented as:

Y Li · 2022 · 1 — ... beam splitter. ... Moreover, the carrier frequency in the holograms can be easily adjusted via shifting the CBS perpendicular to the optical axis.

Circular polarised lightmeaning

One of the main advantages of circular polarization is its resistance to signal degradation caused by reflections and scattering. When an electromagnetic wave encounters a reflective or scattering surface, the wave can become polarized in a different direction. In the case of linear polarization, this change in polarization can cause signal loss or interference. However, circularly polarized waves remain circularly polarized after reflection or scattering, allowing for better signal transmission and reception in environments with high levels of reflection or scattering, such as urban areas or indoor spaces.

In practical terms, RHCP is often used in various applications, including satellite communications, radar systems, and wireless communications. It helps in reducing interference and improving signal quality, particularly in environments where multiple signals may be present.

Here, the phase difference between the x and y components is −π/2​. This results in the electric field vector rotating counterclockwise when viewed from the receiving end.

Elliptically polarizedlight

The article has been reviewed by Dr. Botao Feng, an IEEE Senior Member/Senior Engineer/Senior Research Fellow; a Postgraduate Advisor/Postdoctoral Advisor from Shenzhen University, Antennas and Propagation, Wireless  Communication.

What does circularly polarizedlightlook like

If that´s really true, I will for sure buy the 12K. I found little amount of other headset with such diopter adjustment. to mention VIVE Flow (forget about FoV). I just quote from a reddit post and adapt a little bit " 75% of adults use vision correction. Even the CHEAPEST binoculars have diopter adjustments…" Which means, those who can afford (Hear me, PIMAX, Your dear customer is speaking!), often require diopter adjustment + IPD adjustment or at least fitting for wearing Glasses or diopter adapters.

Right-hand circular polarization (RHCP) is a type of electromagnetic wave polarization where the electric field vector rotates in a right-handed manner as the wave propagates. This means that if you were to look in the direction that the wave is moving, the electric field vector would rotate clockwise.

An objective lens determines the basic performance of an optical microscope or imaging systems and is designed for various performance needs and applications.

The propagation characteristics of LHCP and RHCP can be influenced by environmental factors, such as terrain, obstacles, and atmospheric conditions. Engineers must account for these factors when designing communication systems to ensure reliable performance in real-world scenarios.

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Fiber Optic Lighting. In data transmission applications for fiber optics, one device is connected by to another, each one acting as a transmitter or receiver.

– Right-hand Circular Polarization (RHCP): The electric field vector rotates clockwise when viewed from the receiving end. It can be represented as:

As of right now, I think Pancake lenses will be great and what is truly needed for something like working in VR to become viable. It makes headsets thin and light enough to be both extremely comfortable to slip on and wear for hours without the slightest strain. I’ve seen some express wanting to have a ‘monitor replacement’ VR headset, and I’ve never felt like it’s viable long term even with the super high clarity HMDs. The comfort just isn’t there yet.

Pancake, on the other hand, works by folding a series of lenses into a curved shape and bouncing light within the glass or plastic. This allows VR HMDs to be thinner and lighter, while also freeing up processing power due to the lack of distortion.

I don’t believe Pimax is shipping any pancake lens headsets. I’m actually not sure what they are using for lenses on the Crystal, but I’m quite sure its not a pancake lens design.

But, until we can reach a good point like that, I don’t have any interest in pancake lenses. I’ll happily take bulky HMDs, such as the current Pimax designs, if it means being able to have very wide FoV and a packed feature set. It’s sort of like laptops in a way, where sure very small form factors that’re easier to transport exist, but by the sheer nature of having more space a 17-inch laptop can usually fit far more into it, be it things like ports, unsoldered ram, higher power components due to better cooling, vs a 15.6 and especially 14-inch laptop.

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In contrast, left-hand circular polarization (LHCP) has the electric field vector rotating counterclockwise when viewed in the direction of wave propagation. The choice between RHCP and LHCP can be important, as using the same polarization for both transmitting and receiving can enhance signal reception and minimize loss due to polarization mismatch.

Elliptical polarization

I have kind of been waiting for reports of some home tinkerer having motorized that dial in one of those HMDs, to produce a sort of makeshift varifocal functionality. :9 (No idea how much the zoom level changes with this change in a pancake setup, either…)

Kopin announced an all plastic Pancake lens design called P95, which specially optimized for use with 2.6K x 2.6K OLED high-brightness microdisplays.

In conclusion, circular polarization is important because it provides better resistance to signal degradation caused by reflections and scattering, it is less affected by Doppler shift in satellite communication, and it has various other advantages in different applications. Circular polarization plays a crucial role in improving signal transmission and reception, reducing interference, and enhancing the performance of various systems and technologies.

The Fresnel optics features a wide field of view compared to Pancake but is prone to chromatic aberrations (ghosting/overlapping colours). Furthermore, software calibration taking up processing power must account for Fresnel lens known as “distortion’.