Pr:YLF crystals Protactinium doped Yttrium Lithium Fluoride

HGO grows Pr:YLF laser crystals using Czochralski technology. Pr3+:YLF has been found as promising laser material for producing visible lasers directly and UV lasers through intracavity second-harmonic generation. Very few laser materials have the necessary properties for the realization of lasing in the visible spectral range. Trivalent praseodymium (Pr3+) is known to be an interesting laser ion for use with solid-state lasers in the visible spectral range because of its energy levels scheme, providing several transitions in the red (640 nm, 3P0 to 3F2), orange (607 nm, 3P0 to 3H6), green (523 nm, 3P0 to 3H5), and dark red (720 nm, 3P0 3F3+3F4) spectral regions.



Descriptions:


HGO grows Pr:YLF crystals Protactinium -doped Yttrium Lithium Fluoride crystals. Pr3+:YLF has been found as promising laser material for producing visible lasers directly and UV lasers through intracavity second-harmonic generation. Very few laser materials have the necessary properties for the realization of lasing in the visible spectral range.



Optical and physical properties of Pr:YLF crystal

Absorption peak wavelength

444 nm

Absorption cross-section at peak

8 × 10-20 cm2

Absorption bandwidth at peak wavelength

~5 nm

Laser wavelength

523 nm, 607 nm, 639 nm, 698 nm, 721 nm

Lifetime of 3P0 energy level

50 μs

Emission cross-section

20 × 10-20 cm2

Refractive index @1064 nm

no=1,448, ne=1,470

dn/dT

-5,2 × 10-6 (||c) K-1, -7,6 × 10-6 (||a) K-1

Thermal expansion coefficient

~16 × 10-6 K-1

Thermal Conductivity /(W·m-1·K-1)

6

Crystal structure

tetragonal

Lattice Constants

a=5.164, c=10.732 Å

Melting Point

819°C

Density

3,95 g/cm3

Mohs hardness

5

Typical doping level

<1 at.%


HGO offers Pr:YLF specifications:

Doping(atm%):

0.1% ~ 2%

Orientation:

a-cut/c-cut crystalline direction

Wavefront Distortion:

λ/4per inch @ 632.8 nm

Dimension Tolerances

+0.0/-0.05 mm , Length: ±0.1 mm

Surface Quality:

10/5 Scratch/Dig MIL-O-1380A

Parallelism:

< 10

Perpendicularity:

< 5

Clear Aperture:

> 90%

Surface Flatness:

< λ/10 @ 632.8 nm

Chamfer:

< 0.1 mm @ 45o

Barrel Finish

50-80 micro-inch (RMS) ,

Size

Upon customer request

Coating

AR/HR/PR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use

Other YLF-based Nd/Ho/Tm/Yb/Er/Ce YLF are also available upon request.

Advantages:

1) High absorption and emission cross-sections(~10-19cm2)

2) Good overlapping of the absorption band in the blue spectral region with the emission

of the InGaN laser diodes and 2ω-OPSL

3) Diode-pumped solid-state lasers for precise and efficient processing of metals such as copper or gold, entertainment industry and science


Why Choose HGO ?

HG OPTRONICS.,INC. grow YLF-based crystals in house using CZ growth technology. The use of high quality starting materials for crystal growth, whole boule interferometry, precise inspection of scattering particle in crystal using He-Ne laser and delicated measurement of bulk losses using spectrophotometer assures that each crystal will comply with customer’s specification and perform well.

And base on our diffusion bonding technology various YLF-based configurations are availabl to supply,



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