Del Mar Photonics

PIV Particle Image Velocimetry Lasers & Harmonics

This case study is in the process.

Customer Inquiry:

We have a dual pulsed PIV laser (532 nm) with 4mm beam diameter at oprtaes at maximum 15Hz repetition rate. Maximum output power is 70mJ/pulse and pulse duration is 15 nano sec. We are looking for a portable harmonic generator, which can generate 355/266nm.
Can your product LG103 serve this purpose for this laser. If yes, what is the efficiency in conversion we can expect?

Del Mar Photonics

Compact Pulsed Nd:YAG Lasers

Del Mar Photonics offers compact pulse Nd:YAG lasers with excellent beam quality, high energy/efficiency and possibility of efficient PRR changes with no significant degradation of the output beam parameters. No matter how you may wish to use it — as a stand­alone laser or as a pump source for tunable lasers and OPO — the Del Mar Photonics LQ529 laser provides a combination of high operation parameters, reliability and reasonable price which could not be achieved earlier.

Ring cavity design of the LQ529 oscillator ensures perfect balance of energy, beam quality and reliability.

Excellent Beam Quality
Compensation of depolarization over the Nd:YAG rod cross­section together with traditional advantages of ring cavities ensure excellent beam profile. Unique optical design of the LQ529 not only makes losses and distortions caused by induced birefringence almost negligible, but also minimizes thermal lensing effect. The above allows the user to vary pulse repetition rate within a wide range and requires no further cavity alignment to preserve high beam quality and output energy.

LQ529 lasers provide smooth beam profile for all harmonics.
Figures show beam profile at 355nm/50Hz.

This constitutes a great advantage over lasers using expensive and difficult to align Gaussian optics and thus demanding realignment and sometimes even replacement of optical components in order to avoid dramatic worsening of their output parameters if pulse repetition rate (PRR) has been changed.

Energy Through Efficiency
One of the main reasons for moderate efficiency of conventional Q-switched lasers is birefringence induced in the Nd:YAG rod leading to depolarization of laser output. Each time the beam passes through the cavity, depolarized lasing is filtered by various polarization units and is dropped out of the cavity that leads to decrease in laser operation efficiency. Optical design of the LQ529 laser cavity allows to practically eliminate energy losses caused by depolarization and provides laser energy output with more than 2% wall-plug efficiency of a laser system (total electrical-to-optical power efficiency). Such a high efficiency allows the LQ529 to provide up to 600mJ output energy without using an amplifier. Single rod and single flash lamp design is the determining factor for reduction of the laser price and maintenance costs.

Supplementing the basic model with a one­pass amplifier allows to provide up to 1500mJ output energy
in the fundamental (model LQ929) while preserving all the advantages of the LQ529 model.

A power supply unit and a self-contained water-to-air cooling system are integrated into one compact package. Remote controller with the tactile panel and large LCD makes laser operating much more convenient.

Stable And Reliable Operation
One of the obvious advantages of the laser is its absolute mechanical stability and rigidity.


Pulse-to-pulse energy stability of LQ529C laser at 355nm (THG)

All optical components are mounted on the rigid optical bench which is mechanically and thermally isolated from the laser housing. This ensures exceptional alignment stability even under toughest conditions of transportation and operation. All non­linear crystals and Pockels cell are temperature stabilized. Optical bench with cavity components is also temperature­stabilized. High-precision termo­stabilization ensures minimal pulse­to­pulse and long­term instability. Heating of optical components to the temperature exceeding ambient totally eliminates any risk of condensation. This feature along with dust­proof housing protects the optics from damage and minimizes the necessity in service. It should also be noted that the LQ529 laser design eliminates the necessity of any laser alignments after flashlamp replacement, while the replacement procedure itself takes less than 10 minutes.

All Harmonics Available
All harmonic options — 532nm, 355nm, 266nm and 213nm — are available as standard.
High-efficiency Harmonic Generators can be either built-in (except for the FiHG) or supplied as separate units upon the customer’s request. For this reason all the harmonics can be ordered with the laser or at later date.

Compact Intelligent Power Supply
A power supply unit and a self­contained water­to­air cooling system are integrated into one compact package. Compact size and closed loop cooling system which requires no external water, allow to place the power supply under the optical bench or wherever convenient. Computer control using the optional RS232 interface allows integration into laboratory or industrial automated systems.
High­power cooling system and automatic temperature control with 0.5°C precision ensure stable laser operation at up to 30°C ambient temperature. A heater built into the cooling system reduces warm-up time to several minutes even at 15°C ambient temperature.


* Built-in and External Harmonic Generators up to 5th Harmonic
* Solid State Raman Converter
* Solid State Optical Parametric Oscillator OPO
* High Power Attenuator for All Harmonics
* Custom Configurations

Case studies:
Raman shifter for conversion from 1064 nm to 1328 nm


Nonlinear optics
Excellent beam quality and high pulse energy allow to use the LQ529 laser for nonlinear spectroscopy, plasma physics, nonlinear optics and harmonic generation.

High pulse repetition rate allows to reduce data collecting time, while high stability almost eliminates calibration drift troubles in Raman and time-resolved spectroscopy.

Critical for the success of PIV experimentation is stable, reliable compact laser source. The LQ529 ideally suits for most PIV experements. Del Mar Photonics offers several custom configurations for Particle Image Velocimetry experiments based on the LQ529.

Pump source
The LQ529 ideally suits for tunable lasers and OPO pumping. Models LQ829 and LQ929 are ideal pump lasers for terawatt class Ti:Sapphire amplifiers.

Material processing
Meets almost all major requirements made to lasers for industry applications. Design features provide a highest reliability and low demands to operation conditions. Low operating cost, fast and simple service are also significant factors for industrial applications of the LQ529 Laser.

Mobile laser systems
Unique mechanical rigidity and resistance to mis-alignments, low electricity consumption and air cooling make the LQ529 an ideal laser source for various mobile measuring and monitoring systems which may be installed on any transport means. Dust protected laser head design ensures long-term reliable operation of laser optical components even in field conditions.

Nd:YAG laser models

   Model LQ529A LG529B LQ529C LQ829 LQ929
   Configuration Oscillator only Oscillator + Amplifier
   Pulse repetition rate, Hz 5 10 10 20 50 10 10
   Output energy, mJ              
   at 1064 nm 500 500 350 350 150 1000 1400
   at 532 nm 1), 3) 280 280 190 190 80 550 800
   at 355 nm 1), 4) 110 100 90 90 40 220 300
   at 266 nm 1), 3) 100 70 60 40 16 120 180
   at 213 nm 2), 4) 25 20 15 12 5 40  50
   Pulsewidth, ns 5) 10...13 8...11
   Beam diameter, mm ≤8 ≤6 ≤5 ≤10 ≤11
   Divergence, mrad ~1.5 ~1.3 ~1.5
   Stability +/- % better than 5) 2.5
   Cooling self-contained water-air cooling system
   Power consumption, less than, W
   (single phase, 220V+/- 10%, 50/60 Hz)
400 600 600 800 1000 900 1000
   Dimensions, mm              
   Laser head 575 x 180 x 100 600 x 220 x 115
   Power supply 650 x 290 x 650 770 x 340 x 670

1) Harmonic generators built in laser head
2) When operating with external harmonic generator LG105
3) When SHG is optimized
4) When THG is optimized
5) At 1064 nm

* Excellent beam quality and stability
* All harmonics up to 213 nm
* High pumping efficiency
* Turn-key operation
* Remote controller and RS232 interface as standard
* No external water, single phase mains operation
* Low maintenance

Nd:YAG Laser LQ929 is used as pump laser for second stage amplifier in Femtosecond Terawatt Ti:sapphire Laser System Teahupoo MPA-XL

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