MgO:PPLN

  • Update:Jul 22, 2019
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MgO:PPLN for efficient wavelength conversion Adding 5% magnesium-oxide to lithium niobate significantly increases the optical and photorefractive resistance of the crystal while preserving its high nonlinear coefficient. This allows more stable operat

Product Introduction

MgO:PPLN for efficient wavelength conversion

Adding 5% magnesium-oxide to lithium niobate significantly increases the optical and photorefractive resistance of the crystal while preserving its high nonlinear coefficient. This allows more stable operation at visible wavelengths and lower temperature operation than a similar undoped crystal. MgO:PPLN can be operated at temperatures as low as room temperature and in some cases, without temperature stabilisation. With temperatures from ambient up to 200°C, MgO:PPLN offers significantly wider wavelength operation than undoped PPLN.

Specially developed for red-green-blue generation and high power mid-IR operation, our proprietary MgO:PPLN poling process offers high fidelity periods from 4.5μm to 33μm+ and is ideal for volume manufacture. As shown below, our MgO:PPLN domains are poled through the entire thickness of the sample, providing maximum optical aperture.

Our MgO:PPLN crystals are designed to work with a wide range of common laser wavelengths. Each off-the-shelf device includes multiple gratings for flexible temperature and wavelength operation. MgO:PPLN has a wide operating temperature range from 30-200°C.

Crystal lengths are 0.3mm to 1mm for short-pulse femtosecond lasers and 10mm to 40mm for ns to CW systems. Our standard crystals are supplied clip-mounted and off-the-shelf. Custom crystal lengths, thicknesses, AR coatings, and grating designs are also available upon request.

Pictorial representation of a PPLN grating where laser light focused into the grating is converted to another wavelength. This can be achieved with the correct poling period, crystal temperature, and z-axis polarization.

MgO:PPLN for SHG: visible and near-IR wavelengths

Second Harmonic Generation:

*  High efficiency frequency doubling of IR lasers to visible and shorter near-IR wavelengths

* Available in 0.5mm and 1.0mm apertures

*  Mounted and double-band AR coated

Applications:

*  Green and blue generation

*  Scientific & medical

*  Frequency comb stability

*  Fluorescence microscopy

Our SHG MgO:PPLN crystals are designed to work with a wide range of common laser wavelengths. Each device has several gratings to allow phase matching at different temperatures. The visible wavelength devices contain multiple gratings designed for phase matching of the nominal pump wavelength typically between 30-200°C. Tuning to temperatures up to 200°C allows phase matching to longer wavelengths. All of our products undergo rigorous quality inspection and are supplied clip-mounted and off-the-shelf. Custom crystal lengths, thicknesses, AR coatings, and grating designs are also available upon request

*custom crystal lengths from 0.3mm to 50mm available upon request

MgO:PPLN for OPO, DFG and SFG

The wide transmission range and non-critical walk-off angle of MgO:PPLN make this material ideal for generating wavelengths throughout the mid-IR.

Based on our standard design layout, our MgO:PPLN OPO (optical parametric oscillator), DFG (difference frequency generation) and SFG (sum frequency generation) crystals are designed to work with common pump wavelengths at 1064nm, tunable 775nm and 1550nm. Our OPO and DFG crystals cover a broad continuous tuning range from the near-IR to beyond 4.5µm in the mid-IR, whilst our SFG crystals are designed for tunable green generation.

Our crystals undergo quality inspection and are supplied off-the-shelf. Our crystals are AR coated and clip-mounted, ready for use with our ovens and controller.

Optical Parametric Oscillation / Generation:

*  Widely tunable mid-IR from a 1064nm pump source

*  Also suitabe for DFG

*  Temerature tuning from 30-200oC

*  Available in 0.5mm and 1.0mm apertures

*  Mounted and triple-band AR coated

Applications:

*  Mid-IR spectroscopy

*  Environmental monitoring

*  LIDAR & laser counter measures

*custom crystal lengths from 0.3mm to 50mm available upon request

Difference Frequency Generation:

*  Temperature tuning 30-200oC

*  Available in 0.5mm and 1.0mm apertures

*  Mounted and triple-band AR coated

Applications:

*  Mid-IR spectroscopy

*  Environmental monitoring

*  LIDAR & laser counter measures

*custom crystal lengths from 0.3mm to 50mm available upon request

Sum Frequency Generation:

*  Combines fixed 1550nm and tunable 780nm or 810nm pump sources to provide tunable green wavelengths

*  0.5mm apertures

*  Mounted and triple-band coated

Applications:

*  Cascaded THG from 1550nm

*  Quantum optics

*custom crystal lengths from 0.3mm to 50mm available upon request

Custom MgO:PPLN for R&D to high-volume OEM

We provides a versatile basis for the design and manufacture of unique PPLN crystals. Our custom design and fabrication service provides application- specific technical consultation with specialist grating design and contract manufacture, resulting in a wavelength conversion solution tailored to your target laser system. We offer a range of custom design packages including:

*  one-off crystals

*  OEM prototyping

*  Large-volume manufacture

If our stock crystals do not meet your requirements, our engineering team is available to find the best crystal solution for your interaction. Our custom fabrication service involves consultation with the customer for design of the full grating layout, mask design, wafer poling, dicing, polishing and AR coating.

Your custom crystal can be designed to have a standard multi-grating layout, so that you can continue to use our temperature control systems, or your own unique design that is customised to your OEM laser system.

We can manufacture single crystals as small as <1mm3 for compact intra-cavity designs, or several millimetres wide aperture gratings with a long crystal length for high power applications.

Custom Designs for Non-standard Interactions:

PPLN crystals can be designed with aperiodic grating patterns to enable tailored spectral or thermal performance.

Periodic Custom designs:

*  Specific poling periods with custom AR coating

*  Specific poling periods with wider aperture

*  Non-standard length and custom aperture angles

Aperiodic Custom designs:

*  Linear period chirped gratings

*  Non-linear period chirped gratings

Please contact our design team to discuss your custom grating requirement.

MgO:PPLN Applications

Chemical fingerprints can be identified for homeland security applications. PPLN devices are designed for efficient frequency conversion of lasers allowing you to reach wavelengths that cannot be achieved with conventional solid state lasers, diode lasers etc.

For example, you can use PPLN to:

*  frequency double a 1064nm laser to 532nm, a technique used for green laser pointers

*  convert 1064nm to 3µm, used for gas detection or microscopy imaging techniques

*  generate a narrow linewidth laser source for targeting a specific atomic transition for laser cooling and trapping.

Alternatively, PPLN has often been used to frequency double a high power tuneable 1550nm fibre source as a low cost and compact alternative to the Ti:Sapphire laser. Such a source can be used in microscopy systems for live-cell imaging, or terahertz time-domain spectroscopy where

PPLN devices are commonly used for high power mid-IR generation in an optical parametric oscillator. Tunable mid-IR systems are used in a wide range of microscopy imaging techniques as well as spectroscopy applications for environmental imaging. With pulse energies in excess of 1mJ, these mid-IR sources are also used in the defence industry for laser countermeasures and LIDAR systems.

Our MgO:PPLN has a wide range of applications:

Femtosecond Lasers

§ THz generation

§ Metrology

§ Frequency comb stabilization

Bio-Photonics

§ CARS microscopy

§ Fluorescence-based microscopy

§ DNA sequencing

Defence

§ Laser countermeasures

§ Trace gas detection LIDAR

Green Lasers

§ Laser projectors

§ Seabed surveying

Quantum Optics

§ Quantum computing

§ Precision navigation systems

Aerospace

§ Environmental monitoring

§ Remote sensing Interferometry

Examples:

Picosecond cascaded frequency doubling with two crystals from 1952nm to 488nm. By Lin Xu, ORC, Uni. Of Southampton

Nanosecond optical parametric oscillator for mid-IR generation Image courtesy of Elforlight 1952nm to 488nm By Lin Xu, ORC, Uni. Of Southampton

CARS microscopy image of elegans worm

PPLN ovens, temperature controllers and accessories

Our optical engineers have designed a range of PPLN crystal clips, ovens, temperature controllers and mounting accessories, providing a complete PPLN system for easy integration into your optical arrangement.

Our PPLN clips are easily mounted into the oven using the auto-locating pins. These also allow the PPLN clips to be swapped in and out with negligible realignment of the optical train.

Several sprung pins in the oven top hold the PPLN crystal clip securely in place. The oven and PPLN crystal can then be mounted in any orientation, flexible to your choice of optical arrangement.

We recommends the OC2 temperature controller for high thermal PV oven series. The PV Oven Series is specially designed to provide secure mounting and robust thermal stability for our PPLN crystals.

Key Features:

*  Auto-locating dowel pins for alignment-free insertion

*  Temperature stability of ±0.01°C with OC2 controller

*  Various mounting options available

Part number

Crystal length

Oven length

PPLN clip

STCS-PV10

1mm, 10mm

22mm

PC1, PC10

STCS-PV20

20mm

32mm

PC20

STCS-PV40

40mm

53mm

PC40

STCS-PV50

50mm

62mm

PC50

PPLN clip kits:

The PPLN Clip Kits provide secure mounting of our PPLN crystals. All our crystals are supplied clip-mounted and ready for use in our ovens.

OC2 temperature controller

The OC2 temperature controller is a compact stand-alone benchtop unit for use with our PPLN oven range. The auto-detect feature provides hassle-free, plug- and-play functionality. The user can simply dial in the required temperature and allow the oven to reach optimum stability.

Key features:

§  Simple push button interface

§  Set point stability ±0.01°C

§  Set point resolution 0.01°C

§  Maximum temperature 200°C (250°C upon request)

§  PC control interface via USB

§  Auto-detect feature for all PPLN crystal ovens

Part number

Control range

Set point resolution

Stability

For ovens

Input

STCS-oc2

Near-ambient to 200oC

0.01 oC

+/-0.01 oC

PV10,PV20,

PV40,PV50

90-240VAC 50-60Hz

PC control:

*  Standard USB type B connector

*  OC2 software application

*  Data saved to .csv format

*  Features slow ramping via the Cycle Mode for finding SHG phase matching peak

*  LabView Drivers

*  PC control upgrade kit available for OC1 units: OC1-USB

Oven-free mounting solutions

Part number

Description

Optical height

STCS-PCMO01

Oven free PC01 clip mount adapter

8mm

Key features:

§  PC01 clip kit secured with two nylon tipped grub screws

§  M3 threaded hole

§  Each PCMO01 is supplied with an M3 to M4 thread adapter

Example mounting solutions:

§  M3 threaded hole allows fixture to Ø1/2” post assemblies

§  M3 to M4 thread adapter allows fixture to Ø1” post assemblies

§  M4 post assemblies can be fixed on to dovetail translation stages for alignment through all available gratings, as well as fine adjustment through a grating aperture

PPLN mounting example using PCMO01

Post mount adapters

Part number

Description

Optical height

STCS-PVP1

PV10 post mount adapter

25mm

STCS-PVP2

PV20, PV40 and PV50 post mount adapter

25mm

PPLN mounting example using PV10 and PV1

Flexure stage adapters:

*  Compatible with standard flexure stages and mounts from major optomechanics suppliers

*  PV oven and adapter have an optical height of 25mm above the flexure stage platform

*  Riser plate, RP12.5, increases the optical height of standard flexure mounts from 12.5mm to 25mm

Part number

Description

Optical height

STCS-PVP1R

PV10 adapter mount for flexure stages

25mm

STCS-PVP2R

PV20 & PV40 adapter mount for flexure stages

25mm

STCS-RP12.5

12.5mm riser plate for flexure stage mounts

25mm

 

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