Acousto-optical spectrophotometer is the new device for high-speed measurement of optical coating characteristics.

General Principles
The acousto-optical spectrophotometer has a wide-aperture acousto-optical monochromator based on electronically tunable acousto-optical filter (AOTF). The AOTF uses a synthetic anisotropic crystal in which phase diffraction grating is formed by an ultrasonic wave propagating inside the crystal. The spatial period of this grating and, hence, wavelength transmitted through the AOTF are determinated by RF signal applied to the AOTF via piezoelectric transducer. Electronic tuning of this ultrasonic diffraction grating provides high-speed wavelength switching and high frequency (up to 3 kHz) of amplitude modulation.

Model

AOS-3S

AOS-3SL

Spectral range

370 ... 1175 nm

Spectral bandwidth

0.3 nm (404.7 nm)
0.5 nm (632.8 nm)
0.8 nm (1014.0 nm)

Wavelength accuracy

±0.4 nm (370 ... 720 nm)
± 1 nm (720 ... 1175 nm)

Number of spectral points

2 ... 201

2 ... 255

Minimal spectral point measurement time

5 ms

Typical spectral point measurement time

40 ms

Photometric accuracy:
      reflectance (R in %)


      transmittance (T in %)

±(0.2 + 0.02R)% (400 ... 720 nm)
±(0.05 + 0.02R)% (720 ... 1100 nm)

±(0.2 + 0.01T)% (400 ... 720 nm)
±(0.05 + 0.01T)% (720 ... 1100 nm)

±(0.1 + 0.02R)% (400 ... 720 nm)
±(0.01 + 0.02R)% (720 ... 1100 nm)

±(0.1 + 0.01T)% (400 ... 720 nm)
±(0.01 + 0.01T)% (720 ... 1100 nm)

Features

Power supply

220V, 50/60 Hz, 250VA

Weight
optical unit
control unit

2.5 kg
12 kg

10 kg
12 kg