Del Mar Photonics - Newsletter Fall 2010 - Newsletter Winter 2010

Pismo pulse picker for laser wavelength: 1025~1045 nm

Customer inquiry:

Nowadays I am finding a proper pulse picker system for my experimental setup and I have some questions about your pulse picker system.


The properties of my laser system is like these:
-Wavelength: 1025~1045 nm (center wavelength: 1035 nm, bandwidth: 20 nm)
-Average power: 5 W
-repetition rate: 100 kHz
-pulse duration: 300 fs level
-pulse energy: 50 uJ
-pulse peak power: 170 MW
-beam diameter: 10 mm


Are there proper pulse picker among your products? or could you make the picker module for my application? If it is possible, how about the price? I want to get a quotation about this module.


Del Mar Photonics reply:

We can offer a new system with up to 1 kHz repetition rate:


Pismo OG10/1/DKDP pulse picker system

Complete Pulse picker system with synchronization and control electronics
Pockels cell crystal: DKDP 12x12x25 mm, ARC 1000-1080 nm (clear aperture 11 - mm)
HV pulse amplitude: up to 10 kV (HV pulse has the amplitude ~5kV with duration 10 ns at level 10% of maximum)
Repetition rate: ss - 1 kHz
System transmission: >85%
Contrast ratio: >1:500
RF source rep. rate: 2…150 MHz and 1 Hz…2 MHz*
RF input: optical (internal fiber coupled photodetector with 1.5-m long plastic fiber) or electric

* - proper operation with input train rep. rate 1 Hz…2 MHz is only available with triggering by external electric signal. The external trigger signal must lead the optical pulse by 0.25-3 μs and must be strictly locked to the optical train with jitter less than 200 ps

USB control with drivers and software included

Also included:
Two Glan-Taylor calcite air-spaced polarizers with mounts
1.5-meter optical fiber for synchronization
LabView-compatible software

Request a quote


As for your questions, please let me answer them:


Question 1: Is it possible? and if it is, what's the expected repetition rate? around 1 kHz ?
>>> see above

Question 2: my laser characteristics are like these;
-Wavelength: 1025~1045 nm (center wavelength: 1035 nm, bandwidth: 20 nm)
-Average power: 10 W
-repetition rate: 100 kHz ~ 50 MHz (adjustable, and can be stabilized to a reference clock)
-pulse duration: 300 fs level
-pulse energy: max 50 uJ
-beam diameter: 10 mm

I wonder that the Pockels cell or PBS could endure the pulse energy or not.

>>> It is ok for our pulse picker.

Question 3: I couldn't understand these sentences; "RF source rep. rate: 2…150 MHz and 1 Hz…2 MHz*
* - proper operation with input train rep. rate 1 Hz…2 MHz is only available with triggering by external electric signal."
In my laser system, pulse repetition rate is stabilized to a reference clock. Even though the stabilization is worked, should I use a external electric signal when the repetition rate of my laser system is under 2 MHz?

>>> Yes, the pulse picker system still have to be synchronized under 2 MHz to ensure stable operation at such low reference frequency. But in case you have a reference clock, it should have a spare trigger output channel so the synching would be easy, should not it?

Additional featured inquiry:

Pismo 10/1-8/1-RTP complete pulse picker system with two Pockels cells

 

Del Mar Photonics

Pulse pickers

The pulse picker consists of the pockels cell, high voltage driver, synchronization and delay generator. It is suitable for single pulse selection from train of femtosecond or picosecond pulses. Also the device is used for pulse slicing in order to increase contrast.

External high-frequency or optical reference High-voltage pulse with adjustable delay High-voltage pulse with adjustable amplitude Two additional sync channels High contrast Low jitter Applications - Pulse selection - Pulse Slicing - Q-switching

Pismo Pulse Pickers brochure - Pismo 8-1-1 manual - Del Mar Photonics

* - please specify with order
Models Pismo 8/2 and Pismo 12/2 incorporate one Pockels cell and produce two high voltage pulses.
Customer requested high voltage generators up to 50kV are also available.

Pulse shapes from Pismo pulse picker

Del Mar Photonics produce pulse picker systems with repetition rate up to 100 kHz.

We can offer you our standard devices for picking single pulse from femtosecond pulse train with following specification:

New models:

1. Pismo OG8-50-1
Pockels cell crystal: DKDP, 6x6x16 mm3, ARC 700-900 nm (clear aperture – 5 mm), other aperture on request
HV pulse amplitude: up to 8 kV (HV pulse has the amplitude ~8kV with duration 10 ns at level 10% of maximum)
Repetition rate: 1 Hz – 50 kHz
RF source: 30-120 MHz
RF input: optical (internal fiber coupled photodetector with 3m length plastic fiber)
System transmission: >85%
Contrast ratio: >1:1000
Cooling requirements: water flow ~3 l/min


2. Pismo OG8-100-1
Pockels cell crystal: BBO, 4x4x20 mm3, ARC 700-900 nm (clear aperture – 3.5 mm), other aperture on request
HV pulse amplitude: up to 8 kV (HV pulse has the amplitude ~8kV with duration 10 ns at level 10% of maximum)
Repetition rate: 1 Hz – 100 kHz
RF source: 30-120 MHz
RF input: optical (internal fiber coupled photodetector with 3m length plastic fiber)
System transmission: >85%
Contrast ratio: >1:1000
Cooling requirements: water flow ~3 l/min

Pismo Pulse Pickers brochure - Pismo 8-1-1 manual - Del Mar Photonics

Components of a standard pulse picker: 1) Pockels cell 2) Control and supply unit 3) Glan prism 4) Glan prism mount 5) Mirror mount 6) Mirror 7) Quarter-wave plate 8) Fiber 9) Fiber holder 10) AC power cord 11) Connection cable 12) Tube (6 m)