Alexandrite rod_Laser Crystal

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Alexandrite rod

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Alexandrite rod

Alexandrite (Cr3+:BeAl2O4, chromium-doped beryllium aluminate) is a laser gain material used in solid-state lasers for applications such as dermatology and Lidar, etc. Alexandrite is produced via the Czochralski growth method. It has a thermal shock resistance five times that of Nd:YAG and a wide emission wavelengths typically between 710nm and 800nm – in many cases around 755nm. It is possible to make broadly wavelength-tunable lasers based on alexandrite. Alexandrite is anisotropic, the absorption and gain properties strongly depend on the direction of pump light’s polarization. This together with the strong birefringence of the material makes it easy to obtain linearly polarized emission with low depolarization losses. Keywords: Alexandrite rod,Alexandrite crystal,755nm alexandrite,Alexandrite laser crystal,Alex rod.

Affiliate classification

Laser Crystal

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Product description

It is possible to make broadly wavelength-tunable lasers based on alexandrite. Alexandrite is anisotropic, the absorption and gain properties strongly depend on the direction of pump light’s polarization. This together with the strong birefringence of the material makes it easy to obtain linearly polarized emission with low depolarization losses.

Material Properties

Formula:	Cr3+:BeAl2O4
Crystal Structure:	Orthorhombic
Unit Cell Dimensions (Å)	5.476(a) x 9.404(b) x 4.427(c)
Thermal Expansion (x 10^-6 K^-1):	5.9(a), 6.1(b), 6.7(c)
Index of Refraction (at 750 nm):	1.7367(a) x 1.7241(b) x 1.7346(c)
Melting Point:	1870 °C
Vickers Hardness:	2000 kg/mm²
Density:	3.7 g/cm³
Thermal Conductivity:	0.23 W/cm•K
Young's Modulus:	469 GPa
Thermal Shock Resistance:	35 - 74W/cm
dn/dT:	8x10^-6K^-1

Absorption Curve

Applications

● Laser Medical Devices for Long Pulse , Q-switch or Picosecond 755nm Lasers

● Dermatology

● Lithotripsy

● Spectroscopy

● Atmospheric lidar etc.

Advantages

● Low threshold, High efficiency

● High damalge threshold

● Excellent quality, Competitive price, Fast delivery

Specifications

Dimension Tolerance	D(+0/-0.05) * L(+1/-0) mm
Scratch/Dig	10/5	Perpendicularity	<5'
Parallelism	<10"	Chips	<0.1mm
Flatness	λ/10@633nm	Clear Aperture	≥98%
Rod Ends	Option 1: Plano-Plano Option 2: Convex-Plano
Coating	Option 1- Normal : AR@755nm on both ends Option 2 -Mirror coating: HR@755nm(S1) & PR@755nm(S2)
Damage Threshold	> 1.5 Million pulses ( tested by third party)
Standard Products	Dia5x115mm, Dia7x110mm, Dia7x125mm Plano-Plano & Convex-Plano Dia6.35x120mm, Dia8x130mm, Dia9.53x117mm Convex-Plano