SIMTRUM Photonics Store

Sign In

  • Forgot your password?
  • Need a new account?

Register


CRD Loss Meter and Reflectometer


GLACIER

Cavity-Ringdown (CRD) Loss Meter and Reflectometer

Our reflectometer GLACIER uses the extreme sensitivity of cavity ring-down spectroscopy to 

quantify the losses of advanced optical coatings down to 5 ppm. As a typical application the 

device can characterize supra-mirrors with up to 99.9995 % reflectivity. Conventional 

absorption and reflection measurements are not sufficiently sensitive to quantify today´s 

super-reflective mirror coatings and are typically limited to the > 1000 ppm range 

(corresponding to < 99.9 % reflectivity). Cavity ring-down spectroscopy measures optical

losses by the decay of the energy stored inside a cavity. The technique reaches unrivalled 

sensitivity, because losses are experienced with each round trip inside the cavity over and over 

again. Smaller losses lead to longer intra-cavity dwell time thereby automatically increasing 

measurement precision. The device features high-speed data acquisition and allows to record 

measurements within seconds. It is delivered complete with a computer and a user-friendly 

software interface for acquisition and real-time analysis.


image.png

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

  Wavelengths in the range 375-1550 nm available

  Footprint 90 x 45 cm²




 GLACIER GLACIER+ GLACIER++
 Number of wavelengths one  two three
 Wavelength range                                                                         375-1550 nm
 Footprint 90 x 45cm2 90 x 55cm2



GLACIER

Working Principle

Glacier uses the principle of reflectivity/loss measurements with cavity ring-down spectroscopy based on very low losses at each mirror bounce. 

The laser pulses travel inside a cavity experiencing optical losses over and over again during each round trip.

image.png

Sketch of the working principle of GLACIER, measurement and fitting procedure


Sample Measurement

image.png


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 and can

be fitted to the following exponential function:


                             image.png


The time constant τ is inversely proportional to the optical losses (1-R) of the cavity 

withtotal reflectivity R:


                               image.png


where n is the refractive index, c is the speed of light, and l is the cavity length


Typical GLACIER measurement of an ultrahigh-reflective mirror for 1030 nm. 

To obtain the data, the cavity losses with and without the sample were 

measured and subtracted. This provides an absolute measurement 

of the test mirror










We are here for you!




Drop us an email at info@simtrum.com to get the Best Price today.

Want more technical information? Click Here for the professional Customized System/ Solutions.




Don't have time to search the products one by one? No worries. you can download the full range of SIMTRUM Product Line Cards.

Click it now.


Want to stay closer to the Market Dynamics and Technological Developments? Just take 5 seconds to Sign In as a member of SIMTRUM, we will bring you the most up-to-date news. 

(Sign in button on the top right of the screen).




Search Reset
Compare Model Drawings & Specs Availability Reference Price
(USD)

Accessories

Compare Model Drawings & Specs Availability Reference Price
(USD)