1st
Input
Vel
Sep
1205C*
Bragg
0th
Acousto-Optic Modulator
RF
1206
APPLICATIONS
FEATURES
Ÿ
Modulator
Ÿ
Low Drive Power
Ÿ
Low Resolution Deflector
Ÿ
Small Size
Ÿ
Frequency Shifter
Ÿ
Good Temperature Stability
DRIVERS
MODEL 522C (DIGITAL MODULATION)
MODEL 532C (ANALOG MODULATION)
* 1205C-1
1205C-2
MODEL 630C-80 (VARIABLE FREQUENCY & MOD’N)
1mm Active Aperture
2mm Active Aperture
OUTLINE DRAWING
50,76
Active
aperture
C/L
22,34
17,77
16,00
6,98
Aperture
11,42
26,65
4-40 UNC x 4mm dp
(2 places)
11,17
Dimn: mm
(1" = 25.4mm)
RF Input (SMA)
Bragg pivot Hole
2.38mm x 4mm dp
Optical centre of AO cell
Coincides to C/L within 0.76mm
ALL SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
ISOMET CORP, 5263 Port Royal Rd, Springfield, VA 22151, USA.
Tel: (703) 321 8301
Fax: (703) 321 8546
E-mail: ISOMET@ ISOMET.COM
Web Page: WWW.ISOMET.COM
Quality Assured.
In-house: Crystal Growth,
Optical Polishing,
A/R coating, Vacuum Bonding
1st
Input
Vel
Sep
1205C*
Bragg
0th
Acousto-Optic Modulator
RF
1206
SPECIFICATIONS
Spectral Range:
Standard Operating Wavelengths:
Interaction Medium:
Acoustic Velocity:
Active Aperture:
Centre Frequency (CF):
RF Bandwidth:
Input Impedance:
VSWR:
DC Contrast Ratio:
.442-> 1.5µm*
442-488nm, 488-633nm, 633-830nm
Lead Molybdate (PbMo04)
3.63mm/µs
1mm and 2mm (see below)
80MHz
30MHz
50Ω Nominal
<1.5:1 @ 80MHz
>1000:1 min (>2000:1 typical)
PERFORMANCE vs. WAVELENGTH
Wavelength (nm):
RF Drive Power, 1205C-1 (W):
RF Drive Power, 1205C-2 (W):
Bragg angle (mrad):
Beam Separation (mrad):
Static Insertion Loss (%) :
442
<0.3
<0.4
4.9
9.7
<10
488
<0.4
<0.5
5.4
10.7
<5
515
<0.4
<0.6
5.7
11.3
<3
633
<0.6
<1.0
7.0
13.9
<3
830*
<0.8
<1.5
9.1
18.3
<3
0.2
35
10
80
0.14
25
15
75
PERFORMANCE vs. BEAM DIAMETER
Beam Diameter (mm):
Rise Time (ns):
Modulation Bandwidth (MHz) @ MTF = 0.5:
Deflection Efficiency (% @ CF):
2.0
360
1.0
90
1.0
180
1.9
85
0.34
60
5.8
85
*Operation at near IR wavelengths with reduced efficiency and modulation bandwidth.
Special A/R coatings to 1.5µm.
The typical MTF (depth of modulation) curve for the 1205C
modulator assuming a 0.14mm beam diameter is shown at the
left. For larger beam diameters the abscissa scales linearly.
The curve is closely approximated by the function.
1205c
140um Beam Dia.
1.0
M ≅ exp - (f/fo)²
Modulus: M
0.8
where:
0.6
f = modulating frequency in MHz
fo = parameter of modulator related to beam waist
diameter = 18MHz (from experimental data)
The value of M from the curve may be used to the sine wave
contrast ratio at a particular modulating according to the relation:
0.4
CR = 1+M/1-M
0.2
0
10
20
Modulating Frequency: MHz
ALL SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
ISOMET CORP, 5263 Port Royal Rd, Springfield, VA 22151, USA.
Tel: (703) 321 8301
Fax: (703) 321 8546
E-mail: ISOMET@ ISOMET.COM
Web Page: WWW.ISOMET.COM
For digital on-off modulation, the contrast ratio will be
greater than the value calculated from the above equation
Quality Assured.
In-house: Crystal Growth,
Optical Polishing,
A/R coating, Vacuum Bonding