OG-V 开关时间可调脉冲选择器

OG-VOG-V 开关时间可调脉冲选择器

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2023-12-14 17:24:51
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产品简介

产品介绍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

详细介绍

产品介绍

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

  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-...

Electrooptic crystal

DKDP

BBO

RTP or KTP

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

Possible custom wavelengths

from 340 to 1280 nm

from 200 to 2200 nm

from 1000 to 2700 nm 

Minimum repetition rate of picked pulses

single-shot

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

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

HV pulse (gate) length
(at level 10%)

3 ns

8 ns

Rise time
(at level 10-90%)

700 ps

3.5 ns

Fall time
(at level 90-10%)

2 ns

3.5 ns

Contrast(1)

>1500:1

>700:1

>800:1

Pockels cell voltage

up to 10 kV

up to 4 kV

up to 3 kV

Optical scheme

half-wave
(quarter-wave upon request)

half-wave/quarter-wave at λ<600 nm; at λ>600 nm - quarter-wave or half-wave with double crystal cell

half-wave
(quarter-wave upon request)

Trigger

internal/external

Complete system transmission at central wavelength

>85% (PC + two Glan-Taylor prisms, default package)
>90% (PC + a Glan-Taylor and a Rochon prism, upon request)
>98% (Pockels cell only) 

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)

Sync source for internal trigger mode

optical/electric

Additional control modes

by edge / by level / built-in burst generator with internal or external trigger

Channel delay time

0...10 us (up to 1 ms upon request)(3)

0...1 us (up to 5 us upon request)(3)

Cooling

passive at up to 3 kHz output rate, water-cooled(4) at 10 kHz and higher

(1) - energy ratio of a picked and any non-picked pulse. The given contrast values are valid for adjacent pulses;
(2) - when operating with 1 Hz…2 MHz input pulse train, an external trigger signal must be used. Such a signal must lead the optical pulse by 0.25-3 us, must be rigidly in sync with the pulse to be picked and must have jitter of less than 200 ps;

(3) - maximum channel delay time is defined by maximum repetition rate of picked pulses and cannot exceed the temporal distance between adjacent pulses at this frequency;
(4) - the HV generator unit requires cooling to support operating temperature below 35°C. Water cooling is required when operating at output frequency of 10 kHz and more (water flow 1 L/min, water temp. 20-22°C, tap or building-scale supply may be also be used if permitted). Heating power to be dissipated does not exceed 80 W even at the highest frequencies (a water chiller is not included and may be supplied separately);





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