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AOM

POLYCHROMATIC MODULATORS


The AOTFnC is a special acousto-optic tunable filterwhich uses the anisotropic interaction inside a Tellurium dioxide crystal (TeO2) to control independently or simultaneously different lines from an incoming UV or VISIBLE laser light (White laser, Ar+, Kr+, HeNe, DPSS, Dye...).

Up to 8 distinct lines can be mixed and separately modulated in order to generate different colorimetric patterns. The specific crystal cut of the AOTFnC produces good diffraction efficiency (> 90%), narrow resolution (1-2 nm), a low cross-talk between lines, and high extinction ratio.

The wide separation angle between 0 and 1st orders, as well as the excellent output chromatic colinearity (<0.2 to <0.3mrd ) make this AOTF a powerful tool for free space or fiber pigtailed applications. Its associated thermal stabilization maintains stable diffraction efficiency and reduces dramatically beam drift with single mode fiber pigtailing.
This is a major advantage for high sensitivity applications.


AOTFnC*

HR7

MR7

LR7

VIS

CPCh

IR

Number of channels / Lines

8

4

2

8

8

1

Acoustic velocity (nom)

660 m/s

660 m/s

660 m/s

675 m/s

640 m/s

Optical wavelength range

400-650 nm

400-650 nm

400-650 nm

450-700 nm

400-650 nm

700-1000 nm

Transmission

> 90 %

> 90 %

> 90 %

> 95 %

> 90 %

> 95 %

AO interaction type

Birefringent

Birefringent

Birefringent

Birefringent

Birefringent

Birefringent

Selected order

-1

-1

-1

-1

-1

+1

Input Light polarization

Linear orthogonal

Linear orthogonal

Linear orthogonal

Linear orthogonal

Linear orthogonal

Linear parallel

Output Light polarization

Linear parallel

Linear parallel

Linear parallel

Linear parallel

Linear parallel

Linear orthogonal

Drive frequency range

74-158 MHz

74-158 MHz

74-158 MHz

80-153 MHz

52-111 MHz

37-62 MHz

Active aperture

3 x 3 mm²

3.5 x 3.5 mm²

3 x 3 mm²

3 x 3 mm²

2.5 x 2.5 mm²

2.5 x 2.5 mm²

Spectral resolution (FWHM)

nom 1-4 nm

nom 2-8 nm

nom 4-16 nm

< 1.5 nm

nom 1.6-7.6 nm

nom 5-11 nm

Separation angle (orders 0-1)

> 4°

> 4°

> 4°

> 4.6°

> 3°

> 3.5°

Chromatic colinearity (order 1)

< 0,3 mrd

< 0,3 mrd

< 0,3 mrd

< 0,2 mrd

< 0.3 mrd

< 0.2 mrd

Temperature stabilization

TN

TN

TN

TN

TN

TN

AO Efficiency

>=90% /line

>= 90 % /line

>= 90 % /line

>= 90 % /line

>= 90% /line

>= 85% /line

Rise time

1 µs / mm

1 µs / mm

1 µs / mm

1 µs / mm

1 µs / mm

1 µs / mm

Max accepted RF power

< 0.15 W /line

< 0.3 W /line

< 0.5 W /line

< 0.1 W /line

< 0.15 W /line

< 1 W /line

Electrical impedance

50 Ohms

50 ohms

50 ohms

50 ohms

50 ohms

50 ohms

VSWR

< 2/1

< 2/1

< 2/1

< 2/1

< 2/1

< 2/1

Size

70 x 36,6 x 35,8 mm3

70 x 36,6 x 35,8 mm3

70 x 36,6 x 35,8 mm3

70 x 36,6 x 35,8 mm3

70 x 36,6 x 35,8 mm3

70 x 36,6 x 35,8 mm3

Operating temperature

10 to 40 °C

10 to 40 °C

10 to 40 °C

10 to 40 °C

10 to 40 °C

10 to 40 °C