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If you’ve ever looked at an LED, you may have noticed that the “leads,” or legs, are two different lengths. The longer leg is the positive side of the LED, called the “anode,” and the shorter leg is the negative side, called the “cathode.”

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The brightness of an LED is directly dependent on how much current it draws. This means that super bright LEDs will drain batteries much quicker than dimmer LEDs. Luckily, it is possible to control the brightness of an LED by controlling how much current passes through it. In fact, controlling the current through an LED is important for a few reasons.

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We provide high precision polarizing beam splitter cubes with edge length between 5mm and 25.4mm, wavelength between 300-2000nm and splitting ratio between 3:7 to 9:1 as standard products. Other parameters, including larger size, higher precision, can also be customized. Please contact us for customization.

Within an LED, current can only flow from the anode (positive side) to the cathode (negative side) and never in the opposite direction. This means that if put into a circuit backward, an LED will not light up. In fact, a backward LED can prevent an entire circuit from operating properly by blocking the current flow past that point. The first thing you should try if an LED doesn’t light up when placed in a circuit is flipping it around.

Some basic math can be used to determine the best resistor value, but for the purpose of this discussion, and for most LEDs, 330 ohm is a good place to start. As such, here is a handy flowchart to help you design an LED circuit and select the proper resistor value using trial and error.

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LEDs, or light-emitting diodes, are a particular type of diode that converts electrical energy into light. Essentially, they are tiny light bulbs that can be used in an electrical circuit. Two of the many benefits LEDs have over traditional light bulbs are that they require a lot less power to light up and are more energy efficient, meaning they turn more of the energy that passes through them into light and less into heat.

When connected directly to a current source, an LED will try to dissipate as much power as it is allowed to draw. When there is too much current available for the LED to handle, the LED will burn itself out and die. For this reason, it is important to limit the amount of current flowing through an LED.

MSE Supplies offers Polarizing Beam Splitter Cubes with surface quality of 20/10 Scratch/Dig, surface flatness of L/8, angle tolerance up to one arcminute and split ratio T:R (transmission vs reflection) tolerance up to 3%.

Thank you for trusting MSE Supplies. Your quote will be emailed to you momentarily. For any questions, please contact us at sales@msesupplies.com.

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The simplest way to light up an LED is to connect it to a coin cell battery. This method works without a resistor because coin cell batteries don’t source enough power to damage the LED. This is a great way to demonstrate the importance of placing the LED the correct way within the circuit — if it’s backward, the LED won’t light up. Simply place the long end of the LED (the positive side) against the “+” side of the battery and place the short end of the LED (the negative side) against the “-” side of the battery, and your LED will light up.

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Beam Splitter (also known as Beamsplitter) is an optical element that splits a beam of light in two. It can also reverse the process by combining two beams of light into one. By shape, it can be classified into cube beam splitters and plate splitters, in which the key optical element is splitter cube and splitter plate, respectively. A beam splitter cube is constructed by gluing two right angle prisms together to form a cubic shape. Dielectric coating is applied to the hypotenuse of one of the prisms to separate the incident beam. There are two models of beam splitter cubes: polarizing and non-polarizing. The polarizing beam splitter cube allows the p-component (light has electric field that is oscillating parallel to the incident plain) to pass while reflect the s-component (light has electric field that is oscillating perpendicular to the incident plain). While the non-polarizing beam splitter cube only splits the light by intensity but is oscillation direction independent. Different coating can split light of different wavelength, including near ultraviolet light (<400nm), visible light (400-700nm), near infrared light (700-1100nm) and infrared light (>1100nm). Beam splitter is widely used in many optical systems, such as interferometers, optic telecommunication, etc.

To control the amount of power flowing through an LED, resistors are crucial. Resistors limit the flow of electrons in the circuit and prevent the LED from trying to draw too much current. We will dive deeper into resistors in another post, but for now the important thing to know is that the basic template for an LED circuit includes connecting a power source, resistor and LED in series, as shown below.

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