Littrow Prism For Laser Cavity Tuning

The Littrow prism is specialized high dispersion designed to produce and separate a wide range of spectra in a simple "direct vision" configuration. It is named after Joseph von Littrow, an Austrian optician who developed one of the first spectrographs using such a prism. Its properties of high angular dispersion, wide spectral range, and simple optical layout suit it well for high-performance spectroscopy applications across both the visible and infrared regions of the spectrum.

 

Our high-quality Littrow prisms ate meticulously crafted to unlock the full potential of laser systems and spectroscopic instruments. At the heart of the prism is an innovative reflective geometry that provides a highly efficient means of laser cavity tuning and mode control. We use only the most refined optical glass polished to perfection for maximum transmission and precision. Our advanced coating techniques achieve reflectivity within 0.1% over the entire operating spectrum. With an angular accuracy measured in arcseconds and wavefront precision near the theoretical limit, our Littrow optical prisms offer a level of laser tuning performance previously unattainable.

 

Take your laser to the highest level of performance. Our Littrow prisms will unleash their full potential through precision tuning and optimization far beyond conventional limitations. We invite you to experience firsthand how accurate precision changes everything.

 

Features

- Ultra-high reflectivity

- High angular precision

- Super-polished optical surfaces

- Precise geometry

- Exceptional stability

- High transmission

- Precise mounting

 

Parameters

Product name	Littrow prism
Angular accuracy	≤ 10 arcseconds
Surface flatness	≤ λ/20 (λ=wavelength of light)
Geometry tolerance	+/-0.05mm or less
Refractive index	≥ 1.9
Operating temperature	15 to 35℃
Material	Lanthanum or custom
Coatings	Multi-layer dielectric coating
Dimensions	10 to 50mm clear aperture or larger

 

Diagrams

 

Applications

The most common and essential applications of Littrow prisms use their ability to provide precise wavelength-selective feedback and control for optimizing laser emission. Their geometry and dispersive properties are uniquely suited for laser cavity tuning, mode control, pulsed laser injection, and other functions that require a highly selective and adjustable optical filter or tuning element.

- Laser cavity tuning

- Laser mode selection

- Pulsed laser injection systems

- Optical spectrum analysis

- Laser calibration standards

- Dispersive delay lines

- Tunable refractive index materials

 

How does prism work?

Optical prisms work by refracting and internally reflecting light to produce changes in its direction of propagation. Some key ways that prisms modify light include:

 

1. Refraction - When light enters a prism, it slows down and bends due to refraction. The amount of bending depends on the glass's refractive index and the incidence angle. Refraction produces an angular deviation of the light beam as it passes through the prism.

 

2. Total internal reflection - If the incidence angle of light striking an inner surface is greater than the critical angle, all light reflects internally. This produces a reversal in the direction of the beam with very little light loss. Prisms are designed so that light enters and exits at angles less than the critical angle but reflects internally at angles more significant than the acute angle.

 

3. Angular magnification - By passing through multiple refractive interfaces and internal reflections in a prism, small input angles can be magnified into much larger output angles. Some prisms are cut at precise angles to magnify angles in a controlled manner. This is used in some prism binoculars and optical instruments.

 

4. Dispersion - White light contains a range of wavelengths, each bends at a slightly different angle (dispersion). Passing white light through a prism like Littrow prism separates the wavelengths, producing an output spread of colors (visible spectrum). Scattering occurs due to wavelength-dependent refracting indices of the glass.

 

5. Image displacement - Specially designed prisms with multiple total internal reflections can displace or shift the position of input images. They deviate the line of sight by a controlled amount to optically move the image laterally, vertically, or at an angle. This is used for prism glasses, optical comparators, and medical equipment.

 

6. Beam splitting - Prism shapes like parallel-sided plates and rhombs can partially reflect and transmit light using Fresnel reflection. This splits some light from the beam while sharing the rest. Beam-splitting prisms are used for optical instruments, camera finders, and rifle scopes.

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