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 cavity 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.


  • 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


  • Mode-Locked Lasers for Generating Ultrashort Pulses with Higher Pulse Energies
  • Injection and Extraction of Pulses in a Regenerative Amplifier
  • OEM Designs

Cavity dumper specifications

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
543 nm 780 nm 800 nm 250-450 nm 800 nm
Active Aperture (mm) 0.30 mm 0.10 mm
Center Frequency
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 (Vertical)
V.S.W.R. 2.1:1
Case Type #120

Pulse Picker Specifications

Model # TEPP-200-40-BR FSPP-380-76-BR
Substrate Tellurium Dioxide (TeO2) Fused Silica (SiO2)
Laser Wavelength (nm) 700 - 1200 nm
Active Aperture 0.10 mm
Carrier Frequency 200 MHz 380 MHz
Digital Modulation Bandwidth 40 MHz 80 MHz
Optical Transmission > 99.8%
Diffraction Efficiency ~ 40-50% > 25%
Rise Time 14 nsec 6 nsec
Acoustic Velocity 4.2E+3 m/sec 5.96E+3 m/sec
RF Power Level (Watt) 2 (50% duty cycle max.) 10 (10% duty cycle max.)
Bragg Angle / Separation Angle 29/59 mrad 25/50 mrad
Wave Front Distortion λ/10
Input Impedance 50 ohms
Optical Polarization Linear
V.S.W.R. 2:1
RF Connector SMA

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