GLACIER-C
The GLACIER-C is a further development of our successful GLACIER reflectometer. The GLACIER allows for measurement of losses of optical coatings down to 5 ppm using the extreme sensitive cavity ring-down spectroscopy method. It is therefore often used to characterize highly reflective mirrors where conventional reflection and absorption measurements are insufficient. The new innovation of the GLACIER-C device is the employment of a super-continuum laser source in combination with a tunable monochromator. This allow for a freely electable wavelength within 450nm and 2000 nm and thus offer an unprecedented flexibility as it is not limited to available diode laser wavelengths. The GLACIER-C combines the unrivalled sensitivity of the GLACIER system with an unrivalled flexibility creating the most powerful deviceon the market. The device features high-speed data acquisition and allows to record measurements within seconds. Easy and fast change of wavelength is facilitated through the user friendly software and easy change of optics on kinematic mounts. |  |
Key Product Features
Reflectivity measurements up to 99.9995%
Various angles of incidence: 5°-45° (and 0°)
S and p polarization (separately)
Antireflective coating characterization down to 0.0005% (5 ppm)
Simple and reproducible alignment for 0.5”, 1” and 2” optics
Spring-loaded mirror fixtures for reproducible mounting without strain
Computer and user-friendly software interface included
High-speed data acquisition and real-time analysis
Super-continuum laser source and tunable monochromator. Easy and fast change of wavelength
Freely selectable wavelength: 450-2000 nm
Footprint 90 x 55 cm²
Working Principle
The principle of reflectivity/loss measurements with cavity ring-down spectroscopy is based on very low losses at each mirror bounce. Pulses travelling inside a cavity
experience optical losses over and over again during each round trip. The device measures the time-dependent intensity I(t) leaked through an end mirror of the cavity
(center). The signal decays with a time constant depending on the intra-cavity losses.
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Sketch of the working
principle of our cavity ring-down device including measurement and fitting procedure |
ght Source
 | The source consists of a super-continuum laser source and a monochromator. The monochromator is tunable as it employs Acousto Optic Tunable Filters (AOTF).The monochromator comes with two AOTF crystals each active in separate broad wavelength ranges. The choice of crystals defines the available wavelengths and can be chosen from seven different crystals as to fit individual requirements. Example 1: 640 nm – 1100 nm & 1200 nm – 2000 nm Example 2: 450 nm – 650 nm & 800 nm – 1400 nm
The figures to show three typical measurements of high reflective samples and measurement of an empty cavity (at 1417 nm) where humidity in the cavity causes extra losses. All measurements are recorded on the same GLACIERC device demonstrating the wavelength flexibility. The loss measurements are realized through a comparison of measurements of cavity losses with and without the test sample. |