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AOM: AOTF TUNABLE FILTERS


Model

Source

Wavelength nm

Aperture mmxmm

Field of View degrees

Tuning Time μs

Polarization

Resolution nm -3dB

Efficiency %

AOTFnC-UV

Laser

350-430

2 x 2

1

<2

Linear

1-2

85

AOTFnC-400.650

Laser

400-650

3 x 3

1

<4

Linear

1-4

85

AOTFnC-VIS

Laser

450-700

3 x 3

1

<4

Linear

1-2

85

AOTF3-LR

Laser/Lamp

400-700

6 x 6

4

<9

Linear/Random

5-25

85

AOTF3-MR

Lamp

400-700

4 x 4

4

<6

Linear/Random

3,5-17

85

AOTF3-HR

Lamp

400-700

3,5 x 3,5

3

<5

Linear/Random

2,5-12

85

AOTF-A2-500.850

laser/Lamp

500-850

3 x 3

4

<4

Linear

5-15

85

AOTFnC-IR

Laser/Lamp

700-1100

2.5 x 2.5

4

<3

Linear

3-9

85

AOTF-A3-700.1200

Laser/lamp

700-1200

3 x 3

3

<4

Linear

11-35

85

AOTF10

Lamp

1250-2500

3 x 3

20

<4,5

Linear/Random

2-10

70-30

 


An AOTF is a solid-state, electronically tunable band-pass filter, which uses the acousto-optic interaction inside an anisotropic medium. These filters can be used with multi-lines sources (mixed gas lasers, Laser diodes...) or with broadband light sources (Xenon, Halogen lamps...). They allow to select and transmit a single wavelength from the incoming light.

The main advantage of this technique is the total absence of any moving part which leads to a reliable, stable and fast technique for wavelength tuning. The RF frequency applied on the AOTF transducer controls the transmitted (filtered in 1st order) wavelength.

A complete spectrum analysis can be done by varying the frequency corresponding to the wavelength range.

The RF amplitude level applied on the transducer allows to adjust the  transmitted (filtered) light intensity level.

This is a unique feature that can provide the AOTF. It is fast (several μs), accurate and procures high extinction ratio.

We offer a whole range of AOTFs based on TeO2 with shear acoustic mode. The filters are designed so as to get the best performances in each wavelength range and to satisfy most of the applications: resolution down to 1 nm, Field of view up to 20 degrees, apertures up to 10 mm...In most cases, the filtered output from the tunable filter is made collinear
to make easier the use of these devices, and to satisfy fiber pigtailing conditions. A random input polarization will be separated into two orthogonal polarizations (order -1 and +1).