Crystals

LASER CRYSTALS AND COMPONENTS	POLYUS Research & Development Institute has 30-years experience in development and production of crystals and components for laser industry.
	Nd:YAG Cr⁴⁺:YAG Cr, Tm, Ho:YAG Er:YAP Ti: Saphire	KTP BBO LiNbO₃ Lu₂SiO₅

Nd:YAG Rod Standard Specifications

Nd:YAG Rods for CW Operation

Material Parameters
	Orientation	[100] within 1 degree
	Depart Level	0.6...0.8% at. Nd
Sizes
	Diameter	4 mm; 5 mm; 6,3 mm
	Length	100 mm; 130 mm
	Dimensional Tolerances: - diameter - length	± 0.1 mm ± 0.5 mm
End Configuration
	Flat-Flat Geometry with AR Coatings
	Flatness	1/10 wave
	Parallelism	within 10 seconds of arc
	Perpendicularity	within 1 minute of arc
	Scratch-Dig	10^-5 MIL-O-13830A
	Reflectivity (at 1.4 - 1.5 µm)	less than 0.2%

Nd:YAG Rods for Pulsed Operation

Material Parameters
	Orientation	[100] within 1 degree
	Depart Level	1.0% at. Nd
Sizes
	Diameter	5 mm; 6,3 mm; 8 mm
	Length	50 mm; 100 mm
	Dimensional Tolerances: - diameter - length	± 0.1 mm ± 1.0 mm
End Configuration
	Flat-Flat Geometry with AR Coatings
	Flatness	1/10 wave
	Parallelism	within 10 seconds of arc
	Perpendicularity	within 1 minute of arc
	Scratch-Dig	10^-5 MIL-O-13830A
	Reflectivity (at 1.06 and 1.3 µm)	less than 0.2%

Cr⁴⁺:YAG Crystals

Cr⁴⁺:YAG crystal is a material that can be used as an active media for CW, pulsed or self mode-locked tunable near IR solid-state lasers with tunability range of 1.34... 1.58 µm as well as a media for Q-switching in lasers with operating wavelength at 0.95...1.1 µm.

Cr⁴⁺:YAG Crystals Properties

Mechanical Properties
	Mohs Hardness	8.5
	Thermal Conductivity	12 W K m^-1
	dn/dt	8 10^-6 K^-1
Spectral Properties
	Operating Transition	³A₂ - ³T₂
	Absorption Band	900 - 1150 nm
	Emission Band	1340 - 1580 nm
	Dopant Level	10¹⁷ - 10¹⁸ cm³
	Damage Threshold (1064 nm, 10 ns)	500 MW/cm²
	Upper Level Lifetime	3,6 ms (300 K)
	Quantum Yield	12% (300 K)
	Absorption Cross Section (1064 nm)	5 10^-18 cm²
	Emission Cross Section (1420 nm)	4.5 10^-19 cm²

Cr⁴⁺:YAG Crystal for CW Operation

Material Parameters
	Orientation	[100] within 1 degree
	Absorption at 1064 nm	1 cm^-1; 2.2 cm^-1
Sizes
	Diameter	3 mm; 5 mm;
	Length	20 mm; 10 mm
	Dimensional Tolerances: - diameter - length	± 0.1 mm ± 0.5 mm
End Configuration
	Two configurations are available: - Flat-Flat Geometry with AR Coatings - Brewster-Brewster Geometry without Coatings
	Flatness	1/10 wave
	Parallelism	within 10 seconds of arc
	Perpendicularity	within 1 minute of arc
	Scratch-Dig	10^-5 MIL-O-13830A
	Reflectivity (at 1.06 and 1.3 µm)	less than 0.2%

Cr⁴⁺:YAG Crystal for Pulsed Operation

Material Parameters
	Orientation	[100] within 1 degree
	Absorption at 1064 nm	1 cm^-1; 2.2 cm^-1
Sizes
	Diameter	3 mm; 5 mm;
	Length	20 mm; 10 mm
	Dimensional Tolerances: - diameter - length	± 0.1 mm ± 0.5 mm
End Configuration
	Two configurations are available: - Flat-Flat Geometry with AR Coatings - Brewster-Brewster Geometry without Coatings
	Flatness	1/10 wave
	Parallelism	within 10 seconds of arc
	Perpendicularity	within 1 minute of arc
	Scratch-Dig	10^-5 MIL-O-13830A
	Reflectivity (at 1.06 and 1.3 µm)	less than 0.2%

Cr⁴⁺:YAG Passive Q-Switch

Features:

high damage threshold
high contrast
low losses
wide spectral range
small sizes
X-ray insensitive
wide temperature range of -60 to +600 °C

Specifications

Wavelength	950 - 1100 nm
Initial Transmittance	15...90%
Initial Absorption coefficient	0.05...3 cm^-1
Aperture	5...12 mm
Contrast	more than 8...10
Optical Length	1...40 mm
Damage Threshold	more than 4 J/cm²
Long-term Stability	more than 15 years

Specification can be optimized under customer requirements.

Cr, Tm, Ho:YAG Crystals Specifications

Wavelength	2.08 µm
Dopants	Cr, Tm, Ho
Sizes: - diameter - length	5; 6.3; 8 mm 50; 80; 100 mm
Efficiency (*)	more than 3%
Threshold	less than 20 J
Output Energy (*)	more than 2 J
AR Coatings	less than 0.2 %

Note: crystal of dia.5 x 100 mm, Xe flash lamp pumped of 100 J, 250 µs, output coupler of 7%

Er:YAP Crystals

   YAlO₃ - perovskite (YAP) is well-known host for solid-state laser application. It has excellent general physical parameters closed to YAG crystal and it can be useful in the same applications as YAG.
   Using Er:YAP crystal for eye-safe lasers with operation at 1660 nm is not usual, because of a necessity to avoid solarization effects under UV flash-lamp radiation. Co-doping Er:YAP with other dopants gives an opportunity to prevent the coloration under the flash-lamp radiation and get high laser efficiency at 1660 nm in eye-safe spectral region.
   Er:YAP crystal is a promising material for eye-safe lasers capable of Q-switched operation with high repetition rate at 1660 nm

STRUCTURAL AND THERMAL PROPERTIES

Density	5.35 g cm^-3
Lattice constant	a = 5.176 A b = 5.307 A c = 7.355 A
Thermal expansion coefficient	9.5 10^-6 K^-1 along a-axis 4.3 10^-6 K^-1 along b-axis 10.8 10^-6 K^-1 along c-axis
Thermal conductivity	0.11 W cm^-1 K^-1
Knopp hardness	977 kg mm^-2 along a-axis
Optical range	220...6500 nm
Refractive index	n_a = 1.929 n_b = 1.943 n_c = 1.952
Temperature coefficient of refractive index	dn_a / dt = 9.7 10^-6 K^-1 dn_c / dt = 14.5 10^-6 K^-1
Lifetime of ⁴S_3/2 state	130 µs

Ti:Saphire Crystals Specifications

Tuning Range	680...1100 nm
Pumping Range	450...532 nm
Absorption Coefficient at 510 nm	0.5...2.5 cm^-1
FOM	more than 200
Orientation	90° to c-axis
Geometry	flat/flat or Brewster/Brewster
Broadband AR Coatings	less than 0.2 %

Ce:Lu₂SiO₅ Polished Crystals

POLYUS Research & Development Institute offers a new material for X-ray and g-ray counters. The Ce:Lu₂SiO₅ crystals may be used for viewing UV radiation.

Features:

Size of 10 x 10 x 10 mm³
Scintillation efficiency of Ce:Lu₂SiO₅ crystals is no less than 70% compared with NaJ(TI)excited by g-ray radiation with energy of 1MeV
Response speed is about 15 ns

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tel:+7 095 3330389 fax:+7 095 3330256
e-mail: mail@polyus.msk.ru

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