Potassium Titanyl Phosphate (KTP Crystal)

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1 Potassium Titanyl Phosphate (KTP Crystal) KTP crystal is grown by improved Flux growing technology and high purity chemical. It is featured with extreme low absorption at the fundamental and second harmonic generation wavelengths. We supply KTP crystal and customer designed KTP crystal for various applications. Features Large Nonlinear Optical (NLO) Coefficient Wide Angular Bandwidth and Small Walk-off Angle Broad Temperature and Spectral Bandwidth High Electro-Optic (E-O) Coefficient and Low Dielectric Constant Applications Frequency Doubling (SHG) of Nd-doped Lasers fro Green / Red Output Parametric Sources (OPG, OPA and OPO) for 600nm 4500nm Tunable Output E-O Modulators Optical Waveguides for Integrated Optics and E-O Devices Specifications Parameter Dimension Tolerance (W ± 0.1) (H ± 0.1) (L / -0.1) mm Transmitting Wavefront Distortion Clear Aperture > 90% central area Flatness Surface Quality 10/5 Scratch and Dig to MIL-O-13830A <10 arc seconds Perpendicularity 5 arc minutes Angle Tolerance (θ) < ± 0.5, (φ) < ± 0.5 AR Coating R< 1064nm and 532nm Quality Warranty Period One year under proper use Note: We have large quantities of standard size KTP crystals in-stock. The next-day delivery is available for the in-stock crystals. The standard size crystals include 1

2 2 2 5mm, 3 3 5mm and 5 5 5mm etc. with dual-band AR-coating for frequency doubling 1064nm. AR-coatings and High Reflection coatings (HR-coatings) at other wavelengths are available upon request. KTP's damage threshold only allows it to be used for medium and relatively low power lasers. Its polished surfaces need to be handled with care, avoid scratching and dust. 2

3 Barium Borate (BBO) Crystal BBO crystal is grown with CZ technology. CZ grown BBO is better than usual Flux grown BBO with better homogeneity, no inclusion and lower defects. The better internal quality of BBO is important as it has lower absorption, higher damage threshold, and better laser performance. We supply crystal length from 0.02mm to 20mm with various aperture and coating. Features Applications Broad phase-matchable SHG range from 409.6nm to 3500nm Wide transmission region from 190nm to 3500nm Large effective second-harmonic-generation (SHG) coefficient High damage threshold of 10GW/cm2 for 100ps 1064nm High optical homogeneity with n 10-6 /cm Wide temperature-bandwidth of about 55. (for type I SHG 1064nm) Good mechanical and physical properties Second, third, fourth and fifth harmonic generations of Nd lasers Frequency-doubling, -tripling and -mixing of Dye lasers Second, third & fourth harmonic generations of Ti:Al2O3 and Alexandrite lasers Optical parametric amplifiers (OPA) and optical parametric oscillators (OPO) Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers Specifications Parameter Dimension Tolerance (W ± 0.1) (H ± 0.1) (L / -0.1) mm Transmitting Wavefront Distortion Clear Aperture > 90% central area Flatness Surface Quality 10/5 Scratch and Dig to MIL-O-13830A <10 arc seconds Perpendicularity 5 arc minutes Angle Tolerance (θ) < ± 0.5, (φ) < ± 0.5 Quality Warranty Period One year under proper use 3

4 Standard Sizes Our sales engineers recommend following standard size crystals for various applications (assuming the laser beam diameter upon crystal is φ2mm to φ3mm) Harmonic generations of Nd:YAG lasers 1064nm Type I, 4 4 7mm, cut Type I, 4 4 7mm, cut Type II, 4 4 7mm, cut Type I, 4 4 7mm, cut Type I, 4 4 7mm, cut 532nm 355nm 266nm 213nm OPO and OPA pumped by harmonics of Nd:YAG lasers 532nm Type I, mm, 21 -cut 680nm 2600nm 355nm Type I, mm, 30 -cut Type II, mm, 37 -cut 410nm 2600nm 266nm Type I, mm, 39 -cut 295nm 2600nm Frequency-doubling of Dye lasers nm Type I, mm, 40 -cut nm nm Type I, mm, 55 -cut nm nm Type I, mm, 80 -cut nm Harmonic generations of Ti:Sapphire lasers nm Type I, mm, 28 -cut nm nm Type I, mm, 42 -cut nm nm Type I, mm, 66 -cut nm Frequency-doubling and -tripling of Alexandrite lasers nm Type I, mm, 31 -cut nm nm Type I, mm, 48 -cut nm Intracavity SHG of Ar+ laser with Brewster-angle-cut BBO 514nm Type I, mm, 51 B-cut 257nm 488nm Type I, mm, 55 B-cut 244nm 4

5 Frequency Conversion of Ultrafast Lasers For frequency conversion of ultrafast lasers with femtosecond (fs) pulse width, the main concern is fs pulse broadening induced by group velocity mismatching (GVM) or group velocity dispersion of NLO crystal. In order to keep efficiency frequency conversion without significant pulse broadening, the suggested thickness (LGVM) of crystals is less than Pulse Width divides GVM. Based on advanced crystal technology, We are proud to provide as thin as 0.02 mm BBO crystals for frequency conversion of ultrafast lasers Application (Type I) BBO Crystals SHG of 700 nm SHG of 800 nm SHG of 900 nm THG of 700 nm THG of 800 nm THG of 900 nm d eff (pm/v) GVM (ps/cm) fs (micron) Damage 10fs (GW/cm2) Ultra-fast Ti:Sapphire Laser Optics Kits Frequency Doubling Crystal Substrate Clear Aperture Thickness Part No. BBO > φ3.5 (mm) 0.02 (mm) UTO8211 BBO > φ 3.5 (mm) 0.03 (mm) UTO8213 BBO > φ 3.5 (mm) 0.05 (mm) UTO8215 BBO > φ 3.5 (mm) 0.1 (mm) UTO8210 BBO > φ 3.5 (mm) 0.5 (mm) UTO8201 BBO > φ 9.0 (mm) 0.5 (mm) UTO8203 BBO > φ 3.5 (mm) 1.0 (mm) UTO8204 Frequency Tripling Crystal Substrate Clear Aperture Thickness Part No. BBO > φ3.5 (mm) 0.02 (mm) UTO8311 BBO > φ 3.5 (mm) 0.03 (mm) UTO8313 BBO > φ 3.5 (mm) 0.05 (mm) UTO8315 BBO > φ 3.5 (mm) 0.1 (mm) UTO8310 BBO > φ 3.5 (mm) 0.3 (mm) UTO8301 BBO > φ 9.0 (mm) 0.3 (mm) UTO8303 BBO > φ 3.5 (mm) 1.0 (mm) UTO8304 5

6 Frequency Quadrupling Crystal Substrate Clear Aperture Thickness Part No. BBO > φ3.5 (mm) 0.02 (mm) UTO8411 BBO > φ 3.5 (mm) 0.03 (mm) UTO8413 BBO > φ 3.5 (mm) 0.05 (mm) UTO8415 BBO > φ 3.5 (mm) 0.1 (mm) UTO8410 BBO > φ 3.5 (mm) 0.3 (mm) UTO8401 BBO > φ 9.0 (mm) 0.3 (mm) UTO8403 BBO > φ 3.5 (mm) 1.0 (mm) UTO8404 Standard Coating Specifications Protective Coating (P-coating) We provide the protective coating which can prevent the polished surfaces of BBO from exposure to moisture, considering the fact the polished surfaces are very easy to be fogged in humid air due to its low hygroscopic susceptibility. P-coated BBO with a mount is much simpler and better to use than BBO with housing. Anti-Reflective Coatings (AR-coatings) We can manufacture and supply single-band, dual-band and broad-band AR Coatings for BBO applications (extracavity and intracavity SHG, THG, 4HG, SFG, OPO, etc.), featured by high damage threshold, low reflectance, anti-moisture and long durability. AR-coatings at other wavelengths are available upon customers' requests Note BBO is soft and therefore the protection of its polished surfaces requires precautions. BBO has a low susceptibility to moisture. The user is advised to provide dry conditions for both use and preservation of BBO. Keep in mind that the acceptance angle of BBO is small, when angle adjusting is necessary. We can design and select the best crystal for you if the parameters of your laser are provided (such as: energy per pulse, pulse width and repetition rate for a pulsed laser, power for a CW laser, mode condition, divergence, laser beam diameter, wavelength tuning range, etc). 6

7 Lithium Niobate Crystal (LiNbO 3 ) LiNbO 3 Crystal is widely used as frequency doublers for wavelength >1μm and optical parametric oscillators (OPOs) 1064nm as well as quasi-phase-matched (QPM) devices. Due to its large Electro-Optic (E-O) and Acousto-Optic (A-O) coefficients, LiNbO 3 crystal is the most commonly used material for Pockel Cells, Q-switches and phase modulators, waveguide substrate, and surface acoustic wave (SAW) wafers, etc. High quality LiNbO 3 components with aperture of (2-15) (2-15)mm and length up to 50mm for frequency doublers and optical parametric oscillators (OPOs). Specifications Parameter Dimension Tolerance (W ± 0.1) (H ± 0.1) (L / -0.1) mm Transmitting Wavefront Distortion Clear Aperture > 90% central area Flatness Surface Quality 20/10 Scratch and Dig to MIL-O-13830A <10 arc seconds Perpendicularity 5 arc minutes Angle Tolerance (θ) < ± 0.5, (φ) < ± 0.5 Coating Single Wavelength AR or Broadband AR Quality Warranty Period One year under proper use Magnesium Oxide Doped Lithium Niobate Crystals (MgO:LiNbO 3 ) Compared with LiNbO 3 crystal, MgO:LiNbO 3 crystal exhibits its particular advantages for NCPM frequency doubling (SHG) of Nd Lasers, mixing (SFG) and optical parametric oscillators (OPOs). The SHG efficiencies of over 65% for pulsed Nd:YAG lasers and 45% for CW Nd:YAG lasers have been achieved in MgO:LiNbO 3 crystals, respectively. MgO:LiNbO 3 is also a good crystal for optical parametric oscillators (OPOs) and amplifiers (OPAs), quasi-phase-matched doublers and integrated waveguide. 7

8 Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG) Nd:YAG crystal is the most widely used solid-state laser material today. We have recently expanded the crystal growth facilities and production capability for Nd:YAG crystals. In order to meet OEM and R&D requirements, an improved quality assurance procedure has been implemented in our company during the crystal growing and fabricating process. Now, we are able to stably supply quantity of Nd:YAG rods with high optical homogeneity, consistent performance, high processing accuracy and on time delivery. Different specifications and size from Φ3 0.5mm to Φ12 150mm are available in our company. Specifications Parameter Dopant Concentration 0.9% ~ 1.1% (atomic %) Orientation <111> crystalline direction (±5 ) Wavefront distortion λ/8 per inch, measured by a double-pass 633nm Extinction Ratio > 30dB Rods with diameter from 3mm to 6.35mm and with length to 100mm > 28dB Rods with diameter from 7mm to 10mm and with length to 100mm Dimension Tolerances Diameter: ±0.025mm, Length: ±0.5mm Barrel Finish: micro-inch (RMS), grooved rod barrel are available Flatness 633 nm <10 arc seconds Perpendicularity <5 arc minutes Surface Quality 10/5 Scratch / Dig MIL-O-1380A Chamfer 45 Clear Aperture Extend over the entire faces to the chamfered edges AR Coating: Single layer MgF2 coating with high damage threshold for high power laser operation. R < 1064nm per surface. Damage threshold Coating over 750MW/cm 1064nm, 10ns and 10Hz HR Coating: 1064nm and 808nm 946nm / 1064nm and 808nmfor DPSS Blue Lasers are available. 8

9 Chromium Doped Yttrium Aluminum Garnet (Cr 4+ :YAG) Cr 4+ :YAG (Y3Al5O12) is an excellent crystal for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Yb:YAG or other Nd and Yb doped lasers at wavelength from 1.0 to 1.2µm. Because of its chemically stable, durable, UV resistant, good thermal conductivity and high damage threshold (> 500MW/cm2) and being easy to be operated, it will replace traditional materials, such as, LiF, organic Dye and color centers. Basic Properties of Cr4+:YAG Formula Cr 4+ :Y 3 Al 5 O 12 Crystal Structure Cubic Garnet Dopant Level 0.5 mol% ~ 3 mol% Hardness 8.5 (Mohs) Damage Threshold > 500 MW/cm 2 Refractive Index 1064 nm Specifications Parameter Flatness < λ/8 Wavefront Distortion < λ/4 <30 arc second Surface quality 20/10 scratch/dig AR-coating 1064 nm Standard Aperture 3 3 ~ 15 15mm AR-coatings and HR-coatings are also available. We can control the initial transmission (T o ) from 10% to 95% according to customers' requirements. Standard size of 3 3mm with T o =80% or 90% in inventory for immediate delivery. The preliminary experiments of our company Cr:YAG showed that the pulse width of passively Q-switched lasers could be as short as 9ns for diode pumped Nd:YAG lasers and repetition as high as 10kHz for diode pumped Nd:YVO4 lasers. Furthermore, an efficient green 532nm, and UV 355nm and 266nm were generated, after a subsequent intracavity SHG in KTP or LBO, THG and 4HG in LBO and BBO for diode pumped and passive Q-switched Nd:YAG and Nd:YVO4 lasers. Cr:YAG is also a laser crystal with tunable output from 1.35µm to 1.6µm. It can generate ultra-short pulse laser (to fs pulsed) when pumped by Nd:YAG laser at 1.064mm. 9

10 Neodymium Doped Yttrium Vanadate (Nd:YVO 4 ) Crystal Nd:YVO 4 is one of the most efficient laser host crystal currently existing for diode laser pumped solid state lasers. With advanced technology on growing high optical quality and large size Nd:YVO 4 crystals, We steadily provides as large as φ35 50mm 3 Nd:YVO4 bulk crystal and φ20 20mm 3 finished crystal with very low intrinsic optical loss. Features Low lasing threshold and high slope efficiency Large stimulated emission cross-section at lasing wavelength High absorption over a wide pumping wavelength bandwidth Optically uniaxial and large birefringence emits polarized laser Applications Diode Pumped Solid State Lasers with 1064nm, 1342nm and 914nm Specifications Parameter Dopant Concentration 0.27atm% ~ 4.0atm% Standard Dimension 3 3 3mm, 3 3 1mm, mm Wavefront distortion 633nm Scattering Sites invisible, probed with a He-Ne laser Orientation ±0.5 Dimensional Tolerance ±0.1mm End-faces Configuration Plano/Plano Surface Quality 10/5 Scratch / Dig MIL-O-1380A Flatness λ/10 at 633 nm Clear Aperture > Central 90% < 10 arc sec. Intrinsic Loss < 0.1% cm -1 Note: Other specifications of Nd:YVO4 crystals and coatings are available upon request! 10

11 Nd:YLF Crystals We grows Nd:YLF crystals using the Czochralski technique. The use of high quality starting materials for crystal growth, whole boule interferometry, and precise measurement of bulk losses using transmission spectroscopy assures that each crystal will perform to customer specifications. Each rod is inspected with a 532nm laser to be free of bubbles and inclusions, Our maintains traceability on all material produced,from finished laser material back to starting chemicals. With advanced technology on growing and manufacturing state-of-the-art fabrication and coating processes enable Our company to provide consistently reliable finished product. We provide a wide variety of finished laser rods and slabs with high optical homogeneity, consistent performance, and high processing accuracy for R&D and OEM requirements. Our general Nd:YLF production capabilities include: Rod sizes from 2mm to 16mm in diameter and from 1mm to 180mm in length Orientation of rod axis to crystal a-axis within 2 degrees Polished and AR coated barrels Nd dopant concentrations between 0.5 and 3.0% Standard Specifications of Nd:YLF Nd: Dopant Level 1.1±0.1% < 10 arc sec. Perpendicularity <5 arc minutes Chamfer 45º Surface quality 10/5 Scratch/Dig per MIL-O-13830B Flatness λ/10 at 633 nm End Coating 1047/1053nm Note: Large rod and slab dimensions and non-standard dopant concentrations are available upon request! 11

12 Neodymium Doped Gadolinium Vanadate (Nd:GdVO 4 ) Crystal Nd:GdVO 4 is a high efficient laser host crystal for diode pumped solid state laser. Nd:GdVO 4 overcomes the low efficient of Nd:YAG and the low thermal conductivity of Nd:YVO 4. It will be a good candidate for low and high power diode pumped solid state lasers. Features Good physical and mechanical properties Large stimulated emission cross-section at lasing wavelength bandwidth Low threshold and higher slope efficiency Low dependency on pumping wavelength and tend to single mode output High thermal conductivity, large absorption coefficient and bandwidth at pumping wavelength Applications Diode Pumped Solid State Lasers Specifications Parameter Nd: Dopant Level 1.0atm% ~ 2.0atm% Wavefront distortion 633nm Scattering Sites invisible, probed with a He-Ne laser Orientation ±0.5 Dimensional Tolerance ±0.1mm Surface Quality 10/5 Scratch / Dig MIL-O-1380A Flatness λ/10 at 633 nm Clear Aperture > Central 90% < 10 arc sec. 12

13 Cr-doped Coquiriite (Cr:LiSAF, Cr:LiSGaF, Cr:LiCAF) We grows high quality, Cr-doped colquiriite crystals using the Czochralski technique. This family of materials includes LiSAF, LiSGaF and LiCAF. The use of high quality starting materials for crystal growth and measurement of Cr concentration using absorption spectroscopy assures that each crystal will perform to customer specifications. Each rod is inspected with a 532nm laser to be free of bubbles and inclusions. Our maintains traceability on all material produced from finished laser material back to starting fluorides. The advanced technology on growing state-of-the-art fabrication and coating processes enable our company to provide consistently reliable finished product. We provide a wide variety of finished laser rods and slabs with high optical homogeneity, consistent performance, and high processing accuracy for R&D and OEM requirements. Our general LiSAF,LiSGaF and LiCAF production capabilities include: Rod sizes from 2mm to 16mm in diameter and from 1mm to 180mm in length Polished and AR coated barrels Orientation of rod axis to crystal a-axis within 2 degrees, Cr dopant concentrations between 0.5 and 5.5 mol % Standard Specifications Nd: Dopant Level As specified < 10 arc sec. Perpendicularity <5 arc minutes Chamfer 45º Surface quality 10/5 Scratch/Dig per MIL-O-13830B Flatness λ/10 at 633 nm End Coating 850nm Note: Large rod and slab dimensions and non-standard dopant concentrations are available upon request! 13

14 Electro-Optic Crystals BBO Crystal BBO crystal is one excellent electro-optic crystal for high power applications for the wavelength range from 200nm to 2,500nm. It has electro-optic coefficients γ 11 = 2.7pm/V and γ 22, γ 31 < γ 11. It launches a super Q-Switch for a CW diode pumped Nd:YAG laser with average power > 50W. We provide high quality BBO crystals with Z-cut, AR-coating and Au-electrodes for high power E-O applications. The standard size is mm, mm, mm, mm, also mm. The half-wave Voltage is 1064nm with size mm. If you need further information, you can contact our sales for latest BBO Q-switch elements. LiNbO 3 Crystal LiNbO3 is widely used as electro-optic modulator and Q-switch for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulator for fiber optics, etc.if a LiNbO3 with specifications listed in the following Table is used as Q-switch crystal, i.e., the light propagates in z-axis and electric field applies to x-axis. The electro-optic coefficients of LiNbO3 are: r 33 = 32pm/V, r 31 = 10pm/V, r 22 = 6.8pm/V at low frequency and r 33 = 31pm/V, r 31 = 8.6pm/V, r 22 = 3.4pm/V at high electric frequency. Specifications Parameter Size mm 3 or mm 3 Other size is available upon request Tolerance of Size Z-axis: ±0.2mm X-axis and Y-axis: ±0.1 mm Chamfer 45 Accuracy of orientation Z-axis: < ±5 arc minutes X-axis and Y-axis: < ±10 arc minutes < 10 arc second Finish 10/5 scratch / dig Flatness λ/8 at nm AR-coating R < 1064 nm Electrodes Gold or Cr electrode on X-faces Wavefront distortion 633 nm Extinction ratio > 633 nm, f6 mm beam 14

15 SAW Wafer LiNbO3 LiNbO 3 is a good acousto-optic crystal and used for surface acoustic wave (SAW) wafer and A-O modulators. LiNbO 3 wafers are used for fabricating SAW devices such as filters, oscillators and resonators. LiTaO3 LiTaO 3 crystal is also an widely used E-O crystal, due to its optical, NLO and E-O properties similar to those of LiNbO 3 crystal, but with higher damage threshold (> 500MW/cm 2 for ns pulsed). Main properties include: Transparent Range: μm; E-O Coefficient: r 33 =30.4; Refractive Indices: n o =2.176, n e 633 nm. Specifications Diameter: Thickness: Orientation: Ref. flat orientation: Ref. Flat width: Bow: Orientation Tolerances: Standard polishing: Φ40.0mm, Φ50.8mm, Φ76.2mm, Φ101.6mm 0.2~1.0mm LiNbO 3 : X, Y, Z, Y, 64 Y, 135 Y, YZ-cut, LiTaO 3 : X, Z, 36 Y, 42 Y, 112 Y X or Y 16± 2mm, 18± 2mm, 22± 2mm, 32± 2mm Less than 20μm Within 10 arc min. or better One side polished 20/10 Scratch/Dig Another side is inspection polished 15

16 ALPHALAS A NEW EFFICIENT LASER MEDIUM: 3+ Nd :KGd(WO 4) 2 NEODYMIUM-DOPED POTASSIUM-GADOLINIUM TUNGSTATE (Nd:KGW) LASING AT mm WITH REMARKABLE FEATURES: 300% more output compared to Nd:YAG, OR, for the same output energy of Nd:YAG three times lower pump power AND more than 10 times longer flashlamp lifetime! Nd:KGW is an efficient Raman converter which produces high intensity -1 radiation shifted to 1.18 µm and 1.54 µm (Raman shift 905 cm ) suitable for fiberoptics communication and research. SELF-PROTECTING FEATURE: The efficient Raman conversion prevents selffocusing and self-phase modulation. SUITABLE FOR THE GENERATION OF SUBPICOSECOND LIGHT PULSES: -1 The luminescence bandwidth (24 cm, 2.73 nm) is six times broader than that of Nd:YAG laser (0.45 nm) and two times broader than that of Nd:YLF thus allowing the generation of subpicosecond pulses. An ideal replacement for the expensive Nd:YLF! HIGHER STORAGE DENSITY due to the lower stimulated emission crosssection (compared to Nd:YAG) results in a better performance in Q-switched operation WELL SUITED FOR DIODE-PUMPED LASERS! Due to broad absorption band > 12 nm needs no thermal stabilization of the pump diode. Available with high doping of 8%. Differential efficiency >60% Attention: the thermal conductivity of this crystal is lower than that of Nd:YAG! For flashlamp pumping an efficient cooling is needed. ALPHALAS GmbH Bertha-von-Suttner-Str. 5, D Göttingen, Germany Tel.: , Fax: , sales@alphalas.com, Web-Site:

17 NEODYMIUM-DOPED POTASSIUM-GADOLINIUM TUNGSTATE (Nd:KGW) HOST CHARACTERISTICS: Chemical formula KGd(WO 4 ) 2 Space group monoclinic; 2/m Lattice constants [Å] Density 3+ Nd : KGd(WO 4 ) 2 Technical specifications Mohs hardness g/cm Melting point 1075 ±5 C a=8.098; b=10.417; c=7.583; ß=94.43 deg Thermal conductivity 2.8[100]; 2.2[010]; 3.5[001] W.m.K -6-1 Thermal expansion 4.0[100]; 3.5[010]; 8.5[001] 10.K Transmission range ALPHALAS nm g m p Refractive index [1 µm, 25 ] n =2.033; n =1.986; n =1.937 Polymorphic transition 1005 ±5 C 3 LASING PROPERTIES: Principal lasing transition Lasing wavelength Fluorescent lifetime Fluorescent width Emission cross-section Gain and absorption Optimum LD-pump wavelength Absorption coefficient (8% conc.) Absorption LD-pump BW (8% conc.) nm cm ; 2.73 nm anisotropic 36 cm Efficiency, flashlamp-pumped 4% Efficiency, LD-pump F 3/2 - I11/2 110 µs (3% doping), 90 µs( 8% doping) 4.3x10 cm 811 nm nm, centered at 811 nm >60% differential ROD SPECIFICATIONS: Orientation [010] ±0. 5 Dopant concentration [at. %] 3% standard, up to 8% available Standard rod sizes xl 6.3x60; 6.3x75 mm Maximum length 75 mm Standard chips for LD-pump 4x4x2 mm, 6x2 mm, 3x2 mm ALPHALAS GmbH Bertha-von-Suttner-Str. 5, D Göttingen, Germany Tel.: , Fax: , sales@alphalas.com, Web-Site:

18 ALPHALAS 4+ Cr :YAG CRYSTALS ALL-SOLID-STATE HIGH POWER PASSIVE Q-SWITCH AND ACTIVE MEDIUM FOR INFRARED FEMTOSECOND LASERS Material parameters: Material: 4+: Cr YAG 4+ Recovery time: 8.5 µs 2 Saturation fluence: 0.5 J/cm Refractive index: Crystal structure: (Cr doped Y Al O ) nm cubic garnet Hardness: Mohs 8.5 Density: Orientation: 4.56 g/ccm [100] +/- 10 (standard) Size: 2 2 Standard apertures: Æ9.5 mm, 8x8 mm, 4x4 mm, Æ2.5 mm Clear aperture: min of dimension. 4+ Thickness: depends on the specified O.D. or initial transmission, Cr concentration and may vary +/- 30% from the specified value. Surfaces: Wedge: <30 arcmin Flatness: nm Surface quality: s/d Coatings (standard): AR/AR@1064 nm, R<0.3% Damage threshold (coated): 2 >500 MW/cm for 10 ns pulses 4+ We have a large variety of Cr :YAG standard crystals in stock for: - Flashlamp-pumped lasers with T=0.25, T=0.32, T= Diode-pumped lasers with T= 0.80, T=0.85, T=0.9 and T=0.95 We are exclusive supplier of Brewster-cut crystals for very high peak power applications. 4+ We also offer specially coated Cr :YAG crystals that serve as OUTPUT COUPLERS. In this way one can save the output mirror and considerably simplify the laser design. Standard reflections at the exit side are: R=8.5%, R=50%, R=90%, R=95%. We also supply crystals with custom specific parameters. ALPHALAS GmbH Bertha-von-Suttner-Str. 5, D Göttingen, Germany Tel.: , Fax: , sales@alphalas.com, Web-Site: