OG-V 开关时间可调脉冲选择器
OG-V快脉冲选择器系列具有可调的传输门时间,用于从飞秒脉冲序列中选择相邻脉冲组。
The following applications might be pointed out when using pulse pickers with adjustable transmission gate time with femtosecond and picosecond lasers:
- selection of
groups of adjacent pulses (bursts) from a train of pulses;
- control of regenerative amplifier operation: injection of a seed pulse into a
cavity and ejection of the amplified pulse out of the cavity;
- usage as optical shutters (fast optical modulators) and Q-switch cavity
applications;
- selection of single laser pulses in case of high jitter in relation to
electric trigger pulse.
The OG pulse picker consists of a certain optical setup and an electronic control and power supply unit.
Optical setup of a pulse picker comprises two crossed polarizers with a Pockels cell placed in between. Pulse selection is performed with the use of the Pockels effect — a quasi-rectangular high-voltage electric pulse induces birefringence in the Pockels cell's optical crystal allowing precise rotation of the polarization plane of a certain laser pulse or a group of adjacent laser pulses depending on the duration of the high-voltage pulse (transmission window). Then this or these pulses may be separated from a train of consecutive pulses by using a polarizer.
产品特点 | 典型应用 |
* Compatible with Ti:S and Yb-doped 20-150 MHz ultrafast oscillators * Suitable for building Ti:S or Yb ultrafast regenerative amplifiers * Possible wavelengths from 200 to 2700 nm * Possible adjustable gate width from 20 ns to 10 us * Transmission >90% * HV amplitude up to 10 kV * Multifunctional control unit with adjustable delay generator * USB control, Windows software+LabView driver |
* Time-Resolved Ultrafast Studies - Pump-Probe Spectroscopy * Material and Biological Tissue Processing -Ultrafast Micromachining * Laser Systems Design, Integration and Amplification -Ultrafast Oscillator and Amplifier Pulse Selection -Injection/Ejection of Pulses in Ultrafast Amplifier Systems -Pulse Slicing for Contrast Increase -OEM Integration -Q-Switching * Ultrafast Laser Diagnostics, Accessories and Components -Novel Ultrafast Fiber Laser Development -Amplifier Design -Automation of Complex Experimental Setups |
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Electronic control unit of a pulse selector is built using programmable logic components and contains such built-in modules as optical and electronic synchronization, trigger pulse generation, frequency division, multi-channel delay signal generation, high-voltage drivers. The unit allows for multiple usage scenarios given below for integration in various laser setups:
- external or
internal trigger;
- synchronization to optical (built-in photodetector) or electric signal;
- two independent delay channel groups, each with its trigger and
synchronization signals; spare channels may be used as general purpose delay
channels for triggering other experimental equipment (e.g. oscilloscopes,
pump lasers, streak-cameras etc.);
- additional control modes with triggering by edge/level of an external signal
or via a built-in burst generator allow formation of various output pulse
patterns;
- up to 4 synchronized Pockels cells may be driven by a single electronic
control unit.
OG-B系列脉冲选择器光学模块和控制模块 OG系列脉冲选择器控制模块
OG-F-D-... |
OG-B-D-... |
OG-B-B-... |
OG-B-R/K-... |
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Electrooptic crystal |
DKDP |
BBO |
RTP or KTP |
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Operational wavelength range (standard models) |
510-540 nm / 700-1000 nm / 1000-1100 nm / 1250 nm |
510-540 nm / 700-1000 nm / 1000-1100 nm / 1250 nm |
1000-1100 nm / 1500-1600 nm / 1550+780 nm |
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Possible custom wavelengths |
from 340 to 1280 nm |
from 200 to 2200 nm |
from 1000 to 2700 nm |
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Minimum repetition rate of picked pulses |
single-shot |
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Maximum repetition rate of picked pulses (standard models) |
1 kHz |
3 kHz / 10 kHz / 50 kHz / 100 kHz |
3 kHz / 10 kHz / 50 kHz / 100 kHz / 200 kHz / 1 MHz |
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Clear aperture |
6 mm |
6 mm (up to 20 mm upon request) |
2.5 mm (up to 5 mm upon request) |
3.5 mm (up to 10 mm upon request) |
HV pulse (gate) shape |
bell-shaped |
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HV pulse (gate) length |
3 ns |
8 ns |
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Rise time |
700 ps |
3.5 ns |
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Fall time |
2 ns |
3.5 ns |
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Contrast(1) |
>1500:1 |
>700:1 |
>800:1 |
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Pockels cell voltage |
up to 10 kV |
up to 4 kV |
up to 3 kV |
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Optical scheme |
half-wave |
half-wave/quarter-wave at λ<600 nm; at λ>600 nm - quarter-wave or half-wave with double crystal cell |
half-wave |
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Trigger |
internal/external |
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Complete system transmission at central wavelength |
>85% (PC + two Glan-Taylor prisms, default
package) |
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Input optical train repetition rate |
2 MHz …150 MHz with internal or external trigger with optical or electric sync to input train; 1 Hz…2 MHz only with external trigger signal(2) |
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Sync source for internal trigger mode |
optical/electric |
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Additional control modes |
by edge / by level / built-in burst generator with internal or external trigger |
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Channel delay time |
0...10 us (up to 1 ms upon request)(3) |
0...1 us (up to 5 us upon request)(3) |
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Cooling |
passive at up to 3 kHz output rate, water-cooled(4) at 10 kHz and higher |
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(1) - energy ratio of a picked and any non-picked
pulse. The given contrast values are valid for adjacent pulses; |