Dual Wavelength Wave plate or retarders are a kind of Multiple Wavelength Wave plates that provide different retardations at two individual wavelengths in applications for dual-wavelength light sources. The working principle of these types of wave plates is to obtain the required phase retardation according to the fitting of the refractive index at different wavelengths. Dual Wavelength Wave plates are particularly useful when used in conjunction with other polarization-sensitive systems to separate coaxial laser beams of different wavelengths or elevate and promote the conversion efficiency of Solid State SHG Lasers. 

Crysmit offers Multiple wavelength wave plates (majorly Dual Wavelength Wave plates, also including Triple Wavelength Wave plates) with high damage thresholds. The Wave plates are of single plate structure and introduce low order retardation, but if you have specific requirements for zero-order dual/triple wavelength wave plates, we might arrange it for you. 

Referring to off-the-shelf modules for online shopping, Crysmit offers two modules of Dual Wavelength Wave plates, with guaranteed fast delivery and cost-effective price:

1. half-wave retardation at 1064nm + full-wave retardation at 532nm, Dual Wavelength Wave plates of Quartz

This configuration offers half-wave retardation to the 1064nm light, and full-wave retardation to the 532nm light. That is to say, the dual-wavelength wave plate will rotate the plane of polarization of the 1064nm light by twice the angle oriented, and virtually does nothing to the polarization state of the 532nm light.

2. half-wave retardation at 810nm + full-wave retardation at 405nm, Dual Wavelength Wave plates of Quartz

This configuration offers half-wave retardation to the 810nm light, and full-wave retardation to the 405nm light. This means the 810nm light will undergo polarization plane rotation, and the 405nm light will have its polarization state remain unchanged.

Other possible wavelength sets include 780/390nm, 800/400nm, 1030/515nm, and 1550/775nm, but are only available upon inquiries. Besides, Crysmit is also competent for realizing custom retardation options at both dual-wavelength and triple-wavelength scales. If you have any specific demands for retardation, just contact us.

What is the principle and difference between a half-wave plate and a quarter-wave plate ？

• Half-wave plate: A half-wave plate introduces a phase shift of half a wavelength to change the polarization state of linearly polarized light. It rotates the polarization direction by a certain angle.

• Quarter-wave plate: A quarter-wave plate introduces a phase shift of a quarter of a wavelength to change the polarization state of linearly polarized light. It converts between linear and circular polarization.

• Difference: The main distinction lies in the amount of phase shift. A half-wave plate introduces a phase shift of half a wavelength, while a quarter-wave plate introduces a phase shift of a quarter of a wavelength. This leads to different effects on light polarization and their specific applications.

What is the dula wavelength wave plate ?

A dual-wavelength wave plate is a type of wave plate that can operate at two or more specific wavelengths simultaneously. It allows for polarization control across a range of wavelengths and is commonly used in various optical systems. It offers convenience and flexibility by providing polarization control for multiple wavelengths within a single wave plate.

What is the application of dual wavelength wave plate ?

The dual-wavelength wave plate is used in applications that require polarization control across a range of wavelengths. It finds application in optical telecommunications, spectroscopy, imaging systems, laser systems, and optical metrology for precise manipulation of polarization at multiple wavelengths.

How to clean the wave plate ?

• Ensure your hands are clean and wear clean gloves.

• Gently wipe the surface of the wave plate with a soft, lint-free cloth or optical-grade tissue.

• If there is oil or stains, use an appropriate cleaning agent such as optical-grade alcohol or optical cleaning solution to gently wipe the wave plate.

• If necessary, use an ultrasonic cleaner for a more thorough cleaning.

• Finally dry it gently with a clean tissue or cloth.

• Be careful not to use excessive cleaning agents, handle with a gentle touch to avoid scratching the surface, and refer to the manufacturer's guidelines for special types of wave plates.