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PPLN Application

PPLN Application

 

With the continuous development of quasi-phase matching technology, polarized crystals (lithium niobate, lithium tantalate, KTP, KTA, etc.) have advantages such as large effective nonlinear coefficients, high nonlinear conversion efficiency, and no walk-off effect. They are currently widely used in nonlinear frequency conversion devices. Our company's PPLNs can be designed as efficiency conversion devices for lasers of any desired wavelength, with a wide range of applications.

 

 

Projector Displays:

• Mini Projectors
• Laser TVs/Movie Theaters
• Head-Up Displays/Windshield Displays

 

 

Biology

• Flow cytometry

• Confocal/CARS microscopy

• DNA sequencing

 

Materials Analysis

• Spectroscopy

• Materials Simulation and Digital Printing

 

Construction and Surveying

• Laser rangefinder

• Level

 

Terahertz

• Imaging

• Spectroscopy

 

Femtosecond laser

• Frequency comb stabilizer

• Metrology

 

 

For more detailed application examples, please refer to Table 1:

Table 1. PPLN Application Case Description

                     

 

Comparing the performance parameters of the three most commonly used nonlinear crystal materials, PPLN, KTP, and LBO, PPLN crystal has the best performance and the highest cost-effectiveness, making it the ideal material for designing laser products.

Table 2 Comparison of PPLN, KTP, and LBO Crystal Parameters

                    

 

PPLNs are widely used in QPM technology due to their high nonlinear d-coefficient and walk-off-free characteristics. Based on QPM molding methods and periodic pattern design methods, QPM structures are classified as: single-period, multi-period, cascaded, chirped, and sector-shaped.

 

Figure 1: Examples of various QPM modes: single-period, multi-period, cascaded (SHG+SFG/DF), chirped, sector-shaped

 

With crystal design achieving quasi-phase matching conditions, the efficiency of waveguide devices is increased by 2-3 orders of magnitude compared to other devices, expanding their application range beyond other similar bulk devices. QPM devices have the advantages of high power and large aperture, but QPM waveguide (WG) devices can further improve the conversion efficiency of nonlinear mixing over long-distance propagation by strictly limiting the laser intensity, as shown in Figure 2.

          

Figure 2. Comparison of QPM devices and QPM waveguide devices