Acouosto-optic Tunable Filters

  • Update:Apr 19, 2020
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Tunable Filters An acousto-optic tunable filter (AOTF) is a solid-state, electronically-addressable random-access optical pass-band filter. It may be used to rapidly and dynamically select a specific wavelength from a broadband or multi-line source. W

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STG Series Acousto-optic Tunable Filters

An acousto-optic tunable filter (AOTF) is a solid-state, electronically-addressable random-access optical pass-band filter. It may be used to rapidly and dynamically select a specific wavelength from a broadband or multi-line source. When specific matching conditions between the acoustic and optical beams are met, diffraction will occur. As a result it is possible to electronically control key filter parameters such as wavelength, modulation-depth and even bandwidth, thus providing rapid (typically μs), dynamic, random access optical filtering.

Resolution bandwidths down to <0.1% are available with exceptional performance and with aperture sizes up to 25 mm and beyond. We have developed and patented techniques to allow us to offer options such as large-aperture imaging filtering, sideband suppression, and transmission of multiple discrete wavelengths.

We offer a range of AOTFs to suit a variety of applications. For scanning an entire image in wavelength at speeds sufficient for real-time video rate spectral imaging, high optical throughput is required. For this purpose devices with large aperture and/or field of view are recommended.

Our standard models are below:

Model

Wavelength

Active Aperture

Resolution

AOTF 2837-31

351-430 nm

2.5 mm

1.0 nm

AOTF 3151-01

400-650nm

2.5 mm

2.5 nm

TF525-250-6-3-GH19A

400-650 nm

3 mm

5 nm

TF525-250-4-6-GH57A

400-700 nm

6 mm

4 nm

TF560-280-1-5-NT2

420-700 nm

5 mm

0.3 nm

AOTF 2838-01

450-670 nm

2.5 mm

1.3 nm

AOTF 2885-02

450-670 nm

2.5 mm

2 nm

AOTF 2885-04

450-670 nm

2.5 mm

4 nm

TF625-350-2-11-BR1A

450-800 nm

11 mm

1.5 nm

TF850-500-1-3-PF3

600-1100 nm

3 mm

1.5 nm

TF850-500-10-6-GH58A

600-1100 nm

6 mm

10 nm

AOTF 2986-01

640-1100 nm

2.5 mm

5 nm

TF925-550-10-3-GH29A

650-1200 nm

3 mm

9 nm

TF950-500-1-2-GH96

700-1200 nm

2 mm

0.6 nm

TF950-500-0.3-3-GH98

700-1200 nm

3 mm

0.3 nm

TF950-500-1-5-NT2

700-1200 nm

5 mm

0.8 nm

TF1300-800-16-11-NO1A

900-1700 nm

11 mm

16 nm

TF2270-2560-5-5-GH65

990-3550 nm

5 mm

5 nm

AOTF 2996-01

1100-2000 nm

2.5 mm

12 nm

TF1650-1100-2-3-GH40

1100-2200 nm

3 mm

1.6 nm

TF1650-1100-9-3-GH30A

1100-2200 nm

3 mm

8 nm

TF1875-1250-10-6-GH59A

1250-2500 nm

6 mm

10 nm

TF1900-1100-6-11-GH54A

1300-2500 nm

11 mm

6 nm

TF1900-1100-6-25-GH87A

1350-2450 nm

25 mm

6 nm

TF2000-1000-2-6-GH78

1500-2500 nm

6 mm

1.2 nm

TF2250-1500-12-7-GH61A

1500-3000 nm

7 mm

12 nm

TF2900-2200-5-3-GH40

1800-4000 nm

3 mm

5 nm

TF3000-2000-3-7-GH78

2000-4000 nm

7 mm

2.6 nm

TF3300-2200-xxx

2200-4400 nm

Up to 15 mm

Varies

STBR Series Free Space Tunable Filters

The STBR series Dynamic Tunable Bandpass Filter adjusts the center wavelength of a narrow band of light over a 100 - 200nm range. It offers very high resolution of ~1.5nm and either single or simultaneous multiple wavelength selection. It is able to precisely and rapidly adjust the wavelength and intensity of the diffracted/filtered light by varying the frequency (see graph) and RF power. We offer both free-space and fiber-coupled configurations. AOTFs are used widely in numerous optical systems and applications, especially in industrial or process control near-infrared (NIR) spectroscopy applications.

Model #

Spectral Range (nm)

Drive RF Frequency (MHz)

 

Optical Aperture (mm)

Spectral Resolution (nm)

Acceptance Angle (deg.)

DE (%)

STBR-QZAF-.20-.40

200-400

90-250

2.0 x 10.0

1.2-7.0

4.4-7.2

20-30

STBR-TEAF_-.36-.52_

360-520

100-190

 

 

 

 

5.0 x 5.0

 

Available Standard Optical Apertures includes:

 

3.0x3.0

5.0x5.0

7.0x7.0

10.0x10.0

 

Other optical apertures are available upon request.

S

H

S

H

70

0.8-4.0

0.5-2.2

4.18-4.36

2.85-3.4

STBR-TEAF_-.40-.65_

400-650

220-110

1.0-5.1

0.5-2.5

4.8-6.2

3.4-4.4

70-90

STBR-TEAF_-.45-.70_

450-700

180-100

1.7-6.2

0.8-3.2

5.2-6.5

3.6-5.0

70-90

STBR-TEAF_-.55-1.0_

550-1000

155-70

1.5-8.3

0.9-5.0

4.3-5.9

3.2-4.5

70-90

STBR-TEAF_-.40-1.0-2CH*

400-1000

220-70

1.2-8.3

0.7-5.0

3.8-5.9

2.8-4.6

50-60

STBR-TEAF_-.80-1.6_

800-1600

130-60

S

H

EH

S

H

70-90

4-10

3-8

2-6

5.39-5.71

4.96-7.2

STBR-TEAF_-1.2-2.0_

1200-2000

90-50

6-16

6-12

4-9

6.78-8.56

5.3-7.5

25-35

STBR-TEAF_-1.5-3.0_

1500-3000

68-34

9-37

8-29

6-22

7.4-9.26

6.6-7.95

30

STBR-TEAF_-2.4-4.5_

2400-4500

40-20

25-83

18-65

14-48

8.43-11.38

7.3-9.72

40

STBR-TEAF_-0.8-1.6-UH

800-1600

190-90

S

H

S

H

60

2-6

2.0-4.5

9.9-15.2

8.65-13.3

STBR-TEAF_-1.2-1.7-UH

1200-1700

120-80

5-7

3.0-5.0

11.9-14.68

9.47-12.88

50

STBR-TEAF_-1.5-2.4-UH

1500-2400

90-55

6-14

4.5-11.0

13.4-16.95

11.9-15.2

40

STBR-TEAF_-2.4-3.2-UH

2400-3200

55-40

14-25

11.0-17.0

16.95-19.8

15.2-17.29

35

STBR- TEAF_-3.2-4.5-UH

3200-4500

45-30

24-48

17.5-37.0

19.8-23.44

17.29-20.9

30

* Available in low or standard resolution.

A crystal of Tellurium Dioxide (TeO2) AOTF that operates in the NIR region in a so-called non-collinear configuration - the acoustic and optical waves propagate at quite different angles through the crystal.

Material: TE – Tellerium Dioxide (350-5000 nm) and QZ – Quartz (SiO2)

Options:

STBR series fiber coupled tunable filters

The STBR dynamic tunable bandpass filters are commonly used to dynamically select among different wavelength channels at the receiver end of dense WDM transmission systems. Other applications include tuning the center wavelength of broadband sources (such as white light sources or LEDs) in laboratory test and measurement systems. A typical band-pass shape of the selected light by AOTF filter is shown in the diagram above on the right. 

Model #

Wavelength Range (nm)

Spectral Resolution  (MHz)

RF Frequency (MHz)

 

Insertion Loss (dB)

STBR-TEAF-0.40-0.60-2FP

400-600

1-5

59-100

3-5

STBR-TEAF-0.45-0.7-S-2FP

450-700

3-9

100-180

3-5

STBR-TEAF-0.9-1.2-UH-2FP

900-1200

1

130-160

4-5

STBR-TEAF-1.2-1.7-UH/EH-2FP

1200-1700

1.0-2.5

80-120

~5

STBR-TEAF-1.5-1.65-UH/EH-2FP

1500-1650

1.5-2.5

80-100

~5

STBR-TEAF-1.1-2.1-S-2FP

1100-2100

4.0-15.0

50-100

5-7

Fiber Type:

Fiber Connectors:

Options:

RF Drivers for STBR Series (free space or fiber coupled) tunable filter:

Model

STBR-VFI-XX-YY-SPS-A-C3

STBR-VFI-XX-YY-SPF-A-C3

Frequency range

XX MHz ( matching the tunable filter requirements)

Frequency Step Size

4 Hz

10 Hz

Frequency Stability

0.010% (100PPM); +15oC to +75oC

0.015% ; +15oC to +75oC

Frequency Switching Speed

15ms typ. (from fmin to fmax)

8ns

Minimum Duration of Each step

N/A

32ns for sweeping mode

1ms for hopping mode (for <300 hops)

15ms for hopping mode (>300 hops)

Power output

Optimised for max performance of the tunable filter device

Power control

N/A

12 bit attenuator with 25dB range (min.)

Modulation

None (TTL or Analog optional)

Enclosure

The unit will be packaged in a 190 mm (7.5 inch) wide by 90 mm (3.5 inch) high by 220 mm (8.75 inch) deep instrument case. The rear panel heat sink increases the depth to 270 mm (10.5 inches) maximum. The size is exclusive of connectors. A detachable AC line cord and RF cable are provided.

Environmental

Nominal Laboratory conditions: The maximum ambient temperature is +35° C. The unit is not sealed against moisture or condensing humidity.

Output Impedance

50 ohms

Output Connectors

SMA jack on front panel

Old Models of Tunable Filters

Over a number of years we have maintained an ambitious development program which we believe has enabled us to enhance the general performance and increase the capabilities of AOTF technology. Our product range includes purpose designed solutions for illumination / excitation wavelength selection and multispectral / hyperspectral imaging, for which we also offer the latest DFS driver technology.

Typical applications include; Biomedical (confocal microscopy & hyperspectral imaging), Scientific (spectroscopy) and industrial (process control).

Following is the list of our old models for your reference. Please contact us for updated information.

   Model

Description

Driver

48032-4-3.5

TeO2, 1.8-5um wavelength, aperture 4mm, deflection 2.7o, RF 5W

64020-200-5ADSDFS-A

64020-200-5ADMDFS-A

48055-2-1.7

TeO2, 1.2-2.2um wavelength, aperture 2mm, deflection 2.71o, RF 1.5W

64020-200-2ADSDFS-A

64020-200-2ADMDFS-A

48058-1-.55

TeO2, 442-676nm wavelength, aperture 1mm, deflection 1.4o, RF 0.8W

Eight Channel:

64048-80-.1-8CH-16

64048-80-.1-8CH-16M

Four Channel:

64048-80-.1-4CH-5

64048-80-.1-4CH-5M

48058-1-.55-WP

TeO2, 442-676nm wavelength, aperture 1mm, deflection 1.4o, RF 0.8W

Eight Channel:

64048-80-.1-8CH-16

64048-80-.1-8CH-16M

Four Channel:

64048-80-.1-4CH-5

64048-80-.1-4CH-5M

48058-2.5-.55

TeO2, 442-676nm wavelength, aperture 2.5mm, deflection 1.4o, RF 0.8W

Eight Channel:

64048-80-.1-8CH-16

64048-80-.1-8CH-16M

Four Channel:

 64048-80-.1-4CH-5

64048-80-.1-4CH-5M

48058-2.5-.55-WP

TeO2, 442-676nm wavelength, aperture 2.5mm, deflection 1.4o, RF 0.8W

Eight Channel:

64048-80-.1-8CH-16

64048-80-.1-8CH-16M

Four Channel:

64048-80-.1-4CH-5

64048-80-.1-4CH-5M

48058-5-.55

TeO2, 442-676nm wavelength, aperture 5mm, deflection 1.4o, RF 0.8W

Eight Channel:

64048-80-.1-8CH-16

64048-80-.1-8CH-16M

Four Channel:

64048-80-.1-4CH-5

64048-80-.1-4CH-5M

48060-8-4-1.0-COL

TeO2, 800-1200nm wavelength, aperture 8x2mm, deflection 23mrad, RF<100mW

 

48062-1-.55

TeO2, 442-676nm wavelength, aperture 1mm, deflection 1.3o, RF 0.8W

Eight Channel:

64040-75-.1-8CH-16B

64040-75-.1-8CH-16MB

Four Channel:

64040-75-.1-4CH-5

64040-75-.1-4CH-5M

48062-1-.55-WP

TeO2, 442-676nm wavelength, aperture 1mm, deflection 1.3o, RF 0.8W

Eight Channel:

64040-75-.1-8CH-16B

64040-75-.1-8CH-16MB

Four Channel:

64040-75-.1-4CH-5

64040-75-.1-4CH-5M

48062-2.5-.55

TeO2, 442-676nm wavelength, aperture 2.5mm, deflection 1.3o, RF 0.8W

Eight Channel:

64040-75-.1-8CH-16B

64040-75-.1-8CH-16MB

Four Channel:

64040-75-.1-4CH-5

64040-75-.1-4CH-5M

48062-2.5-.55-WP

TeO2, 442-676nm wavelength, aperture 2.5mm, deflection 1.3o, RF 0.8W

Eight Channel:

64040-75-.1-8CH-16B

64040-75-.1-8CH-16MB

Four Channel:

64040-75-.1-4CH-5

64040-75-.1-4CH-5M

48062-4.5-.55

TeO2, 442-676nm wavelength, aperture 4.5mm, deflection 1.3o, RF 0.8W

Eight Channel:

64040-75-.1-8CH-16B

64040-75-.1-8CH-16MB

Four Channel:

64040-75-.1-4CH-5

64040-75-.1-4CH-5M

48062-4.5-.55-WP

TeO2, 442-676nm wavelength, aperture 4.5mm, deflection 1.3o, RF 0.8W

Eight Channel:

64040-75-.1-8CH-16B

64040-75-.1-8CH-16MB

Four Channel:

64040-75-.1-4CH-5

64040-75-.1-4CH-5M

TF515-230-4-5-VU1

TeO2, 400-630nm wavelngth, aperture 5x5mm, beam separation 4 o, RF 2W

 

TF525-250-6-3-GH19

TeO2, 400-600nm wavelngth, aperture 3mm, beam separation 3 o

 

TF525-250-6-6-GH57A

TeO2, 400-650nm wavelngth, aperture 6mm, beam separation 3 o

64020-200-2ADMDFS-A

64020-200-2ADSDFS-A

TF527-245-6-3-GH18

TeO2, 405-650nm wavelngth, aperture 3mm, beam separation 3 o

 

TF527-245-6-3-GH19

TeO2, 405-650nm wavelngth, aperture 3mm, beam separation 3 o

 

TF600-300-6-3-GH19

TeO2, 450-750nm wavelngth, aperture 3mm, beam separation 3 o

 

TF640-325-2-12

 

TeO2, 475-800nm wavelngth, aperture 12x12mm, RF 2W

 

TF800-400-20-5-VU2

TeO2, 600-1100nm wavelngth, aperture 6mm, RF ~2W

 

TF850-500-8-6-GH58A

TeO2, 475-800nm wavelngth, aperture 12x12mm, RF<1.5W

64020-200-2ADMDFS-A

64020-200-2ADSDFS-A

TF1450-500-2-F2S-SU6

TeO2, 1.2-1.7um wavelngth, aperture 12x12mm, RF 2W

 

TF1650-1100-9-3-GH30A

TeO2, 1.1-2.2um wavelngth, aperture 3mm, RF 2.5W

 

 

Model

48055-2-1.7

48058-5-.55

Interactive Material

TeO2

TeO2

Acoustic Mode

Shear wave

Shear wave

Operating Wavelength

1.2-2.2um

442-676nm

Operating Frequency

40-70MHz

50-85MHz

Window Configuration

AR Coated

AR Coated

Static Transmission

>95%

>95%

Diffraction Efficiency

>80% @ 1.2um, >70% @ 2.2um

>80% per wavelength

Input Polarization

Linear, perpendicular to acoustic propagation

 Linear, Vertical

(Perpendicular to acoustic propagation)

Input Beam Divergence

6 Deg @ 1.2 um Solid Angle

7 Deg @ 1.7 um

8 Deg @ 2.2 um

 

<30 mrad (solid angle)

 

Acoustic Aperture size

< 2 mm

<5mm

Resolution

6 nm @ 1.2 um

10 nm @ 1.7 um

17 nm @ 2.2 um

3nm @ 476 nm

7.5nm @ 676 nm

Deflection angle with respect to incident beam

2.71°

1.4 degrees (wavelength insensitive)

RF Drive Power

1.5 watts

0.8 watt maximum

Impedance

50 ohms nominal

50 ohms nominal

VSWR

< 3:1 over bandwidth

< 2:1 over bandwidth

Package

53B02965

53B1827

Driver

64020-200-2ADSDFS-A

64020-200-2ADMDFS-A

64048-80-.1-8CH-16(8 channel)

64048-80-.1-8CH-16M(8 channel)

64048-80-.1-4CH-5(4 channel)

64048-80-.1-4CH-5M(4 channel)

 

Model

 48060-8/4-1.0-COL

TF1450-500-3-F2x

Interactive Material

TeO2

TeO2

Acoustic Mode

Shear wave

Anisotropic, slow shear

Operating Wavelength

800-1200nm

1.2μm to 1.7μm

Operating Frequency

55-85MHz

60 to 85MHz

Window Configuration

AR Coated

AR coated

Static Transmission

>95%

 

Diffraction Efficiency

 >85% with linear polarized

light perpendicular to acoustic

propagation

Insertion Loss:

< 3.0dB (for linearly polarised light)

< 6.0dB (for unpolarised light)

Acoustic Aperture Size

8mm x 2 mm

 

Resolution

<1nm (best effort)

3nm at 1300nm, 4.5nm at 1550nm

Acceptance Angle(solid)

>0.75mrad

 

Deflection angle with respect to incident beam

23mrad nominal

 

RF Drive Power

<100mW

2W

Impedance

50 ohms nominal

 

VSWR

< 1.5:1 over bandwidth

 

Package

53B00337

 

Fiber Type

 

Single mode(2m), or Polarisation maintaining(multimode)

Fiber Connectors

 

FC / PC Seiko-Geiken(SMF), or Pig-tails for splicing, FC/APC(PMF)

 

Model

TF515-230-4-5-VU1

TF525-250-6-6-GH57A

Interactive Material

TeO2

TeO2

Acoustic Mode

Shear wave

Anisotropic

Operating Wavelength

400-630nm

400 - 650nm

Operating Frequency

67-134MHz

58 – 116MHz

Input Polarization

Linear, parallel to base

Linear, vertical with respect to base

Field of view

≥6°

± 2°

Spectral Resolution

<4nm @ 500nm

< 6nm at 525nm

Diffraction Efficiency

 >90%

> 90% (95% typical)

Beam Separation

≥4°

> 3º

RF Drive Power

Wavelength dependent ~2W

< 200mW / channel

Input Impedance

50 ohms

50 ohms

Acoustic Aperture

5mm x 5mm

6mm

Clear Aperture

6mm x 8mm

 

Temperature

0°C<T<40°C

Conduction through base

Optical Surfaces

Output surface compensated for maximum pointing-stability of diffracted beam

AR  coated

 

Model

TF527-245-6-3-GH18

TF527-245-6-3-GH18

Interactive Material

TeO2

TeO2

Acoustic Mode

Anisotropic

Anisotropic

Operating Wavelength

405-650nm

405-650nm

Operating Frequency

60-120MHz

60-120MHz

Input Polarization

Linear – Vertical with to base

Linear – Vertical with to base

Spectral Resolution

< 6nm @ 525nm

< 6nm @ 525nm

Beam Separation

≥3°

≥3°

RF Drive Power

2W (16 Channels)

2W (16 Channels)

Input Impedance

50 ohms

50 ohms

Active Aperture

3 mm

3 mm

Polarisation of diffracted order

Linear – Orthogonal to input

Linear – Orthogonal to input

Pointing-Stability of diffracted order

< ±0·01º

< ±0·01º

Cooling

TEC active cooling

Conduction through housing base

 

Model

TF640-325-2-12

TF527-245-6-3-GH18

Interactive Material

TeO2

TeO2

Operating Wavelength

475-800nm

600nm - 1μm

Operating Frequency

65-130MHz

42 - 80MHz

Input Polarization

Linear – Vertical with to base

Linear: Parallel to base

Polarization of diffracted order

Linear – Orthogonal to input

 

Spectral Resolution

< 2nm @ 650nm

< 10nm at 800nm

Diffraction Efficiency

>90%

> 90%

Field of View

>1.4%

≥6º

Active Aperture

12 x12 mm

5 x 5mm

Clear Aperture

13 x13 mm

6 x 8mm

Optical Surfaces

Output face compensated for optimum pointing-stability of diffracted beam

Output face compensated for maximum pointing-stability of diffracted beam

RF Drive Power

2W

Wavelength dependent ~2W Max

 

Model

TF850-500-8-6-GH58A

TF1650-1100-9-3-GH30A

Interactive Material

TeO2

TeO2 (Anisotropic)

Operating Wavelength

600 - 1100nm

1100nm - 2200nm

Operating Frequency

49 – 98MHz

45 to 95MHz

Spectral Resolution

~ 8nm at 850nm

3nm at 1300nm, 4.5nm at 1550nm

Active Aperture

6 mm

3mm

Input Polarization

Linear, vertical with respect to base

Linear – Vertical wrt to base

Polarization of diffracted order

Linear, orthogonal to input (90º rotated)

Linear – Orthogonal to input

Pointing stability of diffracted order

< ± 0.01° typical

< ±0·01º

Field of View

≥2º

 

Beam Separation

≥4º

> 6º

Transmission

>95%

 

Diffraction Efficiency

>90%

 

RF Impedance

50 ohms

50Ω

RF Drive Power

<1.5W

2W

Cooling

Conduction through base

Conduction through base

 Fiber-coupled AOM,  Free-space AOM,  AO Deflector,  AO Frequency Shifter,  Mode Locker,  Pulse Picker/cavity DumperAO Tunable Filter

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