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產(chǎn)品型號(hào)OG-B/F
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OG-B/F固定門開(kāi)啟時(shí)間的脈沖選擇器
具有固定門打開(kāi)時(shí)間的電光脈沖選擇器系統(tǒng)可以從飛秒脈沖序列中選擇單個(gè)脈沖，用于許多應(yīng)用場(chǎng)合。該系統(tǒng)還用于超快激光放大器系統(tǒng)的注入/發(fā)射，以及提高放大器的對(duì)比度。
| 產(chǎn)品特點(diǎn) | 典型應(yīng)用 |
| * Compatible with Ti:S and Yb-doped 20-150 MHz ultrafast oscillators * Suitable for building Ti:S or Yb ultrafast regenerative amplifiers * Possible operating wavelengths from 200 to 2700 nm * Rise time down to 700 ps * Excellent contrast ratio of >1500:1 * Transmission of complete system >90% * 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 |
An electro-optic modulator (EOM) is a pulse selection device based on the Pockels electro-optic effect. Electric field applied to an optical medium induces birefringence and allows fast selection of passing laser pulses. Thus, such a device might be used as a fast pulse picker solution.
Electro-optic pulse pickers with fixed gate duration are widely used in the following applications:
- picking of single laser pulses from a train of pulses;
- reduction of repetition rate of laser pulses;
- building regenerative laser amplifiers: injection of seed pulses into amplifier cavity and ejection of amplified pulses out of amplifier cavity;
- pulse slicer, i.e. output amplified pulse contrast improvement via cleaning of "parasitic" pulses.
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 short 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. Then this pulse may be separated from a train of consecutive pulses by using a polarizer. Since the response time of the Pockels effect is very short, such a unit is suitable for working with dense pulse trains and ultrashort laser pulses.
| 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 | 3 ns | 8 ns | ||
| Rise time | 700 ps | 3.5 ns | ||
| Fall time | 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 | half-wave/quarter-wave at λ<600 nm; at λ>600 nm - quarter-wave or half-wave with double crystal cell | half-wave | |
| Trigger | internal/external | |||
| Complete system transmission at central wavelength | >85% (PC + two Glan-Taylor prisms, default package) | |||
| 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; | ||||
半波模式下脈沖選擇器工作布局
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