Free Space Acousto-Optic Mode Lockers
The Brimrose Free Space Acousto-Optic (AO) Standing Wave Mode Lockers, with corresponding RF Variable Frequency drivers, are designed so the frequency matches the customer's laser resonant cavity longitudinal mode frequencies. It is necessary to adjust the resonant laser cavity mode spacing frequency to be equal to twice the original acoustic wave frequency to achieve mode locking.
The mode-locking technique is actually a phaselocking process, connecting the various longitudinal modes by fixing the relative phase differences among them.
The Brimrose Mode Locker (ML) Driver system consists of two pieces of hardware: the ML Driver Unit containing the RF Amplifier, and the AO Device. The ML Driver is an RF generator utilizing a micro-controller-based, phase-locked loop (PLL) synthesizer. The frequency can be varied within the RF bandwidth of the AO Mode Lockers.
KEY FEATURES
• Good Modulation Depth
• Small Size
• UV/VIS Optical Range
• Suitable for High-Powered Lasers
• Good Operating Stability of the Laser
• Lower Noise Performance
• High Modulation Bandwidth
• Analog Light Intensity Modulation
• Air, Water or Thermoelectrically Cooled
• Laboratory Version
• Custom Configurations Available
APPLICATIONS
• Photonic Sampling
• Femtosecond Laser Micromachining
• Corneal Surgery
• Nonlinear Optics
– Optical parametric oscillators
• Optical Data Storage
• OEM Designs
Model #
FSML-40-20-BR- FSML-80-20- FSML-125-30- 800 BR1064 BR800
FSML-125-30- BR1064
Substrate
Fused Silica
Fused Silica (Uncoated)
Laser Wavelength
Brewster Cut optimized for horizontal polarization at:
800 nm
1064 nm
800 nm
1064 nm
Active Aperture
Up to 5 x 5 mm
Carrier Frequency
40 MHz
80 MHz
125 MHz
125 MHz
Modulation Rate
80 MHz
160 MHz
250 MHz
250 MHz
3dB Bandwidth
± 50
± 10
± 15
±15
Optical Transmission
99.7%
Resonant Modulation Depth
70%
60%
50%
30%
Acoustic Velocity
5.96E+3 m/sec
Wave Front Distortion
λ/10
Input Impedance
50 ohms
Maximum Electric Input Power *
5 – 7 Watts
V.S.W.R.
N/A
Case Type
Water cooled
* The exact amount of RF power will be defined during final testing of fabricated device.
The VFE-XX-YY-DSP1KHz-B2-F7-X is a variable frequency driver operating from 40 MHz to 60 MHz. The frequency adjustment is done via front panel switches with a 1 KHz step size. The output RF power is ~7 Watts optimized for maximum performance of the AO device. A TTL-compatible modulation input is provided to turn “off” the mode-locking function. Also, using the “return voltage read-out” output can identify the resonant or non-resonant frequencies. At resonant frequency, most of the RF energy entering the crystal is absorbed and the minimal back reflection is monitored using this port.
Driver Model #
VFE-XX-YY-DSP1kHz-B2-F7-X
Frequency Range
XX MHz (compatible with the AO device)
Frequency Resolution
1 - 2 KHz
Harmonic Content
≤ - 20 dBc
Frequency Stability
15 minute warm-up, temperature stabilized, Crystal Oscillator referenced
Output Power (Watt)
Power is optimized for peak efficiency with supplied A-O device.
Output Protection
Power amplifiers used will tolerate an infinite V.S.W.R. without damage. Rated power is available
only when a proper RF load is connected.
Rise/Fall Time
To match AO Frequency Shifter requirements
Modulation Input
To match AO Frequency Shifter requirements
Modulation Input
Analog amplitude modulation 50 W; 0-1 V or TTL-compatible 330 W; 0-5 V
Operating Power
90-240 VAC, 50-60 Hz, 55 Watts max.
Enclosure
The unit will be packaged in a 190 mm (7.5 inch) wide by 100 mm (4 inch) high by 220 mm (8.75 inch)
deep instrument case. The rear panel heat sink increases the depth to a maximum of 270 mm
(10.5 inches). The size is exclusive of connectors.
Environmental
Nominal Laboratory Conditions: The maximum temperature is +35° C. The unit is not sealed against
moisture or condensing humidity.
In addition to the standard product shown, customer configurations are available for specialized applications.
商品属性 [波长] 800/1064nm [光学材料] Fused Silica