ELECTRO-OPTICAL PRODUCTS CORPORATION
	62-40 Forest Avenue, 2nd Floor • Ridgewood, NY 11385, USA • Tel: 718-456-6000 • Fax: 718-456-6050 • www.eopc.com

Acousto-Optic Deflectors

		DTS-100  DTS-250  DTS-400 DESCRIPTION CAD DRAWINGS

FEATURES AND ADVANTAGES High resolution Scanning mode or random access mode Wide spectral range Monochromatic operation Circular aperture up to 6.7 mm dia. Low drive RF power Optical transmission at least 95% Up to 50 MHz deflectionfrequencyy Up to 48 mrad deflection angle

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The acousto-optic deflector is used to scan a laser beam over a range of angles, or to control the output angle of a laser beam with great accuracy. A Bragg configuration produces a single first order output beam, whose intensity is directly linked to the power of the RF control signal, and whose angle is directly linked to the RF frequency. By varying the frequency of the RF control signal, the angle of the output laser beam is adjusted.

An acousto-optic deflector is defined by the following parameters:
1) The range of the deflection angle, which is the maximum angle variation of the laser beam, is linked to the frequency range of the device;
2) The resolution of a deflector is the number of specific directions which can be addressed by the deflector. It is linked to the range of the deflection angle and the laser divergence; and
3) The random access time.

A deflector is used to form a high number of "pixels" to scan laser beams.

Two deflectors can be used in series and at right angles, to provide a full two-dimensional Acousto-Optic X-Y Scanning Systems.

Acousto-optic deflectors require a variable frequency source able to cover a frequency range within 10MHz and 2GHz. EOPC offers several stock acousto-optic deflector drivers to choose from, as well as custom models.

Applications for acousto-optic deflectors include generating graphics, compensation of tracking errors in rotating polygon mirrors, optical tweezers (to trap atoms or molecules), two and three dimensional measurements and cavity dumping (high power laser pulses switched out of a laser cavity).

ACOUSTO-OPTIC  Deflector Model   DTS-100   DTS-250   DTS-400   Material   TeO2   Acoustic Velocity (m/s)   620-670 (typ)   Optical Wavelength Range1 (nm)   350-1600   Optical Transmission (%)   >95   Optical Input Polarization   linear // - linear | (1st order)    Aperture (mm)   1.7   4.2   6.7   Diffraction Efficiency (%)   >=70 (across scan angle)   Deflection Angle Range (mrad)             @ 532 nm            @ 1064 nm  41   49   AO Bandwidth (MHz)             @ 532 nm            @ 1064 nm  50   30   Random Access Time @ max beam dia. (usec)   2.6   6.5   10.3   Static Resolution   (Gaussian diffraction limited beam @ 532 nm)   100   250   400   Max Optical Power Density (W/mm2)   typ 5    ELECTRICAL  Input Impedance (ohms)   50   Maximum RF Power (W)   2 (typ)   V.S.W.R.   <2/1 (typ)   Associated Driver   DRF, PLL, DDS + AMP    PHYSICAL/ENVIRONMENTAL  Connector Type   SMA   Size (mm × mm × mm)   48.5 × 27.6 × 20.8    Weight (g)   60   Operating Temperature (°C)   10 to 40  1Monochromatic operation/single line in the wavelength range