Tm:YAP is the best LD-pumping laser crystal of 2μm range for its 795nm adsorption band easily accessible with high power AlGaAs diode, high quantum efficiency, good physical, chemical and optical properties, linearly polarized output and wider absorption band of 4nm than Tm:YAG. It can be used in all-solid-state laser of 2μm range in medicine and military fields.

Advantages of Tm:YAP Crystal

Good physical, chemical and optical properties

Higher efficiency at 2μm range compared to Tm:YAG

Linearly polarized output beam

Wide absorption band of 4nm compared to Tm:YAG

More accessible to 795nm with AlGaAs diode than the adsorption peak of Tm:YAG at 785nm

Specifications

Dopant concentration

Tm: 1.0 ~ 4.0 at%

Orientation

[100] or [010] within 5°

Wavefront distortion

≤0.125λ/inch@632.8nm

Rod sizes

Diameter 2~10mm, Length 2~100mm
Upon request of customer

Dimensional tolerances

Diameter: +0.00/-0.05mm, Length: ± 0.5mm

Barrel finish

Ground or polished

Parallelism

≤ 10"

Perpendicularity

≤ 5′

Flatness

≤λ/8@632.8nm

Surface Quality

10-5(MIL-O-13830A)

Chamfer

0.15±0.05mm

AR Coating Reflectivity

≤ 0.25%

Optical and Spectral Properties

Laser transition

3F4→ 3H6

Absorption cross section

3.7~8.5 x 10-21cm2

Fluorescence lifetime

4.4~7.7 ms

Emission cross section

5.0~6.0 x 10-21cm2

Emission wavelength

1.98 μm for a axis and 1.94 μm for b axis

Diode pump band:

794.8 nm for a axis and 793.5 nm for b axis

Physical and Chemical Properties

Crystal Structure

Orthorhombic

Lattice Constant

a = 0.518 nm
b = 0.532 nm
c = 0.736 nm

Density

5.35 g/cm3

Mohs Hardness

8.5

Refractive Index n

na=1.91，nb=1.92，nc=1.94

dn/dT

dna/dT=9.7 x 10-6/K

dnc/dT=14.5 x 10-6/K

Thermal Conductivity

11W/(m·K)

Thermal Expansion

a: 9.5 x 10-6/K
b: 4.2 x 10-6/K
c: 10.8 x 10-6/K

Specific Heat

400 J/(kg ·K)

Melting Point

1870 °C