Acousto-Optic Cavity Dumpers/Pulse Pickers
The Brimrose Free Space Cavity Dumper is typically used in a mode-locked laser cavity to separate a single optical pulse from the pulsed energy circulating. As a result, nearly all the laser energy is dumped out of the resonant cavity in the form of a single optical pulse. A cavity- dumper offers high peak power and higher repetition frequencies.
The Brimrose high-speed Pulse Picker is used typically in high-speed optical pulse picking external to a laser cavity and is designed to extract single pulses from a fast train of laser pulses up to 100 MHz – few GHz pulse repetition rate, and re-direct the pulse into a different optical path. A cavity-dumped laser, a pulse picker is often called a
c.avity dumper, extracts the circulating pulse from the cavity in only every Nth round trip. The Pulse Picker is in most cases either an
electro-optic modulator or an AO Modulator, combined with a suitable fast electronic driver.
The Brimrose cavity dumper/pulse picker RF driver is designed to provide a pulse of RF energy to an AO modulator used either internal to a laser cavity (Cavity Dumper) or external to a laser (Pulse Picker) and is used to efficiently divert a train of light pulses onto a different chosen path.
KEY FEATURES
• Free Space
• High Diffraction Efficiency
• Small Size
• UV-VIS Optical Range
• Brewster Angle Incidence
• High Modulation Bandwidth
• Up to 400 MHz Frequency
• Higher Repetition frequencies
• Laboratory Version
• Custom Configurations Available
APPLICATIONS
• Mode-Locked Lasers for Generating Ultrashort Pulses with Higher Pulse Energies
• Injection and Extraction of Pulses in a Regenerative Amplifier
• OEM Designs
Model #
TECD-380-95- 543
TECD-380-50- 780
TECD-380- 95-800
FSCD-250-54- BR-400
FSCD-380-92- BR-800
Substrate
Tellurium Dioxide (TeO2)
Fused Silica (SiO2)
Laser Wavelength (nm)
543
780
800
250-450
800
Active Aperture (mm)
0.30
0.10
Center Frequency (MHz)
380
250
380
3dB Modulation Bandwidth (MHz)
95
50
95
54
92
Optical Transmission (%)
>95
>98
Maximum Diffraction Efficiency (%)
70% @ 1W
40% @ 1W
60% @ 2W
70% @ 5W
30% @ 10W
Rise Time (nsec)/ Beam Spot (µm)
10 nsec/31 µm
20 nsec/62 µm
5.8 nsec/29 µm
10 nsec/72 µm
6 nsec/42 µm
Acoustic Velocity
4.2E+3 m/sec
5.96E+3 m/sec
Wave Front Distortion
λ/10
Bragg Angle
1.4 mrad
2.0 mrad
36 mrad
9 mrad@ 450 nm
25 mrad
Input Impedance
50 ohms
Optical Polarization
Linear
Linear
Linear
Linear (Vertical)
Linear (Vertical)
V.S.W.R.
2.1:1
Case Type
#120
Model #
TEPP-200-40-BR
FSPP-380-76-BR
Substrate
Tellurium Dioxide (TeO2)
Fused Silica (SiO2)
Laser Wavelength (nm)
700 - 1200
Active Aperture (mm)
0.10
Center Frequency (MHz)
200
380
Digital Modulation Bandwidth (MHz)
40
80
Optical Transmission (%)
> 99.8
Diffraction Efficiency (%)
~ 40-50
> 25
Rise Time (nsec)
14
6
Acoustic Velocity (m/sec)
4.2E+3
5.96E+3
RF Power Level (Watt)
2 (50% duty cycle max.)
10 (10% duty cycle max.)
Bragg Angle / Separation Angle (mrad)
29/59
25/50
Wave Front Distortion
λ/10
Input Impedance (ohms)
50
Optical Polarization
Linear
V.S.W.R. (%)
2:1
RF Connector
SMA
Both case types allow for Brewster angle adjustment of the input optical beam. The device should operate only with pulsed RF power. The max CW RF power that can be used without damage is 1 Watt.
Driver Model #
FFJ-XX-B3-FY
Frequency (MHz)
XX MHz (compatible with the AO Device)
Frequency Control
Quartz crystal referenced or externally referenced phase locked loop, user selectable.
Frequency Accuracy (%)
0.015%
Harmonic Content (dBc)
≤ - 15
Frequency Stability
0.0015% minimum after 15 minutes warm-up
Output Power
Power level is optimized for compatible AO 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.
Modulation
Pulse modulation is via an internal pulse generator with adjustable pulse delay. Pulse generator may be set
for internal or external trigger mode with a rep rate of 50 KHz to 12 MHz. Pulse width is variable from 7 nsec
to 150 nsec. Pulse delay is adjustable from 0 to 10 nsec.
Rise/Fall Time
To match AO Cavity Dumper/Pulse Picker requirements
Modulation Type
Analog amplitude modulation or TTL compatible
External Modulation Input
50 W; 0-1 V or 330 W; 0-5 V
Operating Power
90-240 VAC ± 25% 50-60Hz; 55W 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 240 mm (9.75 inches). The
size is exclusive of connectors. A detachable AC line cord and RF cable are provided.
Environmental
Nominal Laboratory Conditions: The maximum temperature is +35° C. The unit is not sealed against moisture
or condensing humidity.
OEM Packaging is also available.
商品属性 [波长] 543/780/800/250-450/800nm [活跃孔径] 0.30/0.10mm [光学材料] Tellurium Dioxide (TeO2)/Fused Silica (SiO2)