Acousto-Optic Cavity Dumpers/Pulse Pickers

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 circulating pulsed energy. 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.

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

CAVITY DUMPER TECHNICAL 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

(nm)
    543 nm
    780 nm
    800 nm
    250-450 nm
    800 nm
  

    Active Aperture (mm)
    0.30 mm
    0.10 mm
  

    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 (Vertical)
  

    V.S.W.R.
    2.1:1
  

    Case Type
    #120
  

PULSE PICKER TECHNICAL 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
  
    Center 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