Digilog Technologies Pvt. Ltd.
 
 
Optical Transient Recorder
Simultaneous analog and photon counting acquisition for detection of optical signals
12 bit-40 MHz A/D acquisition
250 MHz single photon count rate
Up to 18 kHz repetition rate
800 KB/s data transfer
Integrated preamplifiers 800 KB/s data transfer
Integrated preamplifiers
1O5 dynamic range by combination of
A/D and photon counting detection
4094 shots on board summation
2 alternate summation channels
Complete acquisition software
 
Photomultiplier module
High dynamic range detectors for analog + photon counting measurements

The best choice for pulsed dynamic signals

The high dynamic range photomultipliers from Licel have been optimized to enhance the results of your measurements in pulsed applications. The compact design combines a stabilized dynode chain for strong light pulses with fast rise times and narrow pulse widths for high single photon count rates. This combination allows high dynamic range measurements by using both analog and photon counting measurements together, thus extending the linear dynamic range to 5 orders of magnitude. Additional advantages are reduced space charge effects and higher light levels that can be measured without suffering from nonlinearities. These features make the Licel high dynamic range photomultipliers your ideal detector for applications such as Lidar, fluorescence detection and other pulsed signal methods.

Features
stabilized dynode chain
overcurrent protection
single photon pulse width <2.2 ns
high pulse load stability
HV remote control option
interface to lens tube system
gated versions available
Spectral Sensitivity

Si-Avalanche Photodiode module
Low noise - high speed detector @ 400 nm-1100nm

High NIR Quantum Efficiency

Now you can measure optical signals in the near IR with high quantum efficiency, comparable to UV-Vis detectors. Our Si-APD Module consists of a TE-cooled detector, a high-speed low-noise preamplifier and HV supply.
Integrated focussing optics and alignment mechanics allow easy integration into your optical setup. The increased sensitivity in the near infrared is a major advantage compared to photomultipliers.
Enhanced and standard NIR sensitivity versions available.

Features
0:5, 0.8,1.5 or 3mm dia. detector size
thermoelectric cooled
low noise, high gain preamplifier
easy system integration with integrated alignment optics and mechanics
integrated HV- and AC-power supply
Applications
LIDAR (Light Detection and Ranging)
fluorescence detection
replacement for photomultipliers >800nm
Spectral Sensitivity

Rotating Polarizer
Multispectral polarization measurements

Concept

The Licel Rotating Polarizer adds (de-)polarization measurements to multispectral detection systems.

A rotating Glan Thompson prism is used to separate p- and s-polarized signal contributions.

The integrated trigger generator synchronizes the laser flashlamp and Q-switch pulses.

 
Features
optical transmission 210 nm to 2.3 pm
extinction 5x105-5 -5x10-6
20 mm clear aperture
integrated trigger generator for
laser flashlamp
acquisition
Q-switch
Ethernet interface
Boresite Alignment Sensor
4-quadrant, range resolved photon counting detector

Continous alignment control

l
In many LIDAR applications, daylight is among the major limiting parameters for the achievable signal range.
By implementing a continuous monitoring and correction of the alignment, the telescope field of view can be reduced close to the laser beam divergence. This can improve operation of narrow field of view Raman or micropulse lidars and unattended operation.

 

Method

The LICEL bore sight alignment controller evaluates the image of the laser return from two user defined height ranges on a multi anode photomultiplier.
It computes correction parameters for the beam steering.

Signals on Multi Anode PMT

   

 

Lidar Automation
Ethernet based lidar components

Overview
The Ethernet based components for Lidar automation provide remote control for laser monitoring, timing parameters, detectors and transient recorders. The modules are building blocks for highly integrated detection systems.

Ethernet is a modern, easy to use and very scalable system control technology. It fits perfectly to any PC. You can run your whole system from a laptop with an internet connection.

Laser Power Monitor

Monitoring every laser shot is the optimum approach to detect laser pulse energy fluctuations, SHG and THG efficiency changes and flashlamp degradation of your laser. A laser spot reflection can measured using a photodiode or a laser power meter.

Specifications:
Input     
:
photodiode/power meter
Resolution
:
10bit
Max. rep. rate
:
100Hz

 

Timing Control

Control the laser, the transient recorder and the gating from a single integrated module instead of using an external pulse generator. The module provides all necessary trigger signals:
laser flashlamp, laser Q-switch, transient recorder and gating. Use these signals to setup a pretrigger solution where the laser can be either master or slave

Specifications:
Laser lamp out
:
5V into 50 Ω, BNC
Lamp out frequency
:
0, 32 Hz - 50 Hz
Acquisition out
:
5V into 50 Ω, BNC
Acquisition out delay
:
0.2 us -13104 us
Q-switch out
:
5V into 50 Ω 2, BNC
0-switch out delay
:
0.013 is -819 µs
Gate out delay
:
0.013 is -819 µs

 

 

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