LBO is a nonlinear optical crystal with combination of number of unique features:

• Wide transparency region
• Broad Type 1 and Type 2 non-critical
• Phase-matching (NCPM) range
• Small walk-off angle
• High damage threshold
• Wide acceptance angle
• High optical homogeneity

LBO is perfectly suitable for various nonlinear optical applications:

• Frequency doubling and tripling of high peak power pulsed Nd doped, Ti:Sapphire and Dye lasers
• Optical parametric oscillators (OPO) of both Type 1 and Type 2 phase-matching
• Non-critical phase-matching for conversion of CW and quasi-CW radiation.

EKSMA offers:

• Crystals length up to 50 mm and aperture up to 30 × 30 mm
• Thin crystals down to 10 µm thickness
• AR, BBAR, P-coating
• Different mounting and repolishing services
• Accurate quality control
• Attractive prices and fast delivery
• One month customer’s satisfaction term.
  

BBO is a nonlinear optical crystal with combination of number of unique features:

• Wide transparency region
• Broad phase-matching  range
• Large nonlinear coefficient
• High damage threshold
• Wide thermal acceptance bandwidth
• High optical homogeneity

As a result of its excellent properties BBO has a number of advantages for different applications:

• Harmonic generations (up to fifth) of Nd:YAG and Nd:YLF lasers
• Frequency doubling and tripling of ultrashort pulse Ti:Sapphire and Dye lasers
• Optical parametric oscillators (OPO) at both Type 1(ooe) and Type 2 (eoe) phase-matching
• Frequency doubling of Argon ion and Copper vapour laser radiation
• Electro-optic crystal for Pockels cells.

EKSMA offers:

• Crystal aperture up to 22 × 22 mm
• Crystal length up to 22 mm
• Thin crystals down to 5 µm thickness
• AR, BBAR, P-coating
• Different mounting and repolishing services
• Accurate quality control
• Attractive prices and fast delivery
• One month customer’s satisfaction term

KTP (KTiOPO₄) is a nonlinear optical crystal, with excellent nonlinear, electrooptical and acousto­optical properties. A combination of high nonlinear coefficient, wide transparency range, and broad angular as well as thermal acceptances makes KTP very attractive for different nonlinear optical and wavequide applications. EKSMA offers different kinds of KTP crystals depending on required application: KTP for extracavity systems (Ex-KTP), KTP for Intracavity (In-KTP) and KTP with High Gray Tracking Resistivity (HGTR KTP).

Ex-KTP is standard crystal with the parameters mostly used in extracavity configuration when the single pass through the crystal is required.

In-KTP crystals are optimised for SHG intracavity confi-guration in low peak power CW lasers. Because of large number of passes through the crystal low insertion losses and high homogeneity are essential for crystal efficiency. The special highest quality material selected by SHG efficiency mapping of each crystal, fine surface polishing and dual band AR coatings with very low losses allow EKSMA to produce KTP crystals suitable for infracavity SHG application.

HGTR KTP is the new crystal type grown by special recently implemented technology. It has almost 2 times larger damage and gray tracking thresholds allowing to use HGTR KTP in high power lasers.

Transparency band edges of KTP crystal are at 0.35 µm in UV and at 3.5 µm in IR region. The phase-matching range of KTP crystal lies in 0.99–3.3 µm region. This allows to use KTP as intracavity and extracavity frequency doubler for the most commonly used lasers, such as Nd:YAG, Nd:YVO and Nd:YLF(1).

Fig. 1 represents Type 2 SHG tuning curve of KTP in x-y plane. In x-y plane the slope ∂ (∆k)/ ∂θ  is small. This corresponds to quasi-angular noncritical phase-matching, which ensures the double advantage of a large acceptance angle and a small walk off. Otherwise in x-z plane the slope ∂ (∆k)/ ∂λ is almost zero for wavelengths in the range 1.5–2.5 µm and this corresponds to quasi-wavelength noncritical phase-matching, which ensures a large spectral acceptance. Wavelength noncritical phase-matching is highly desirable for frequency conversion of short pulses.

As a lasing material for OPG, OPA or OPO, KTP can most usefully be pumped by Nd lasers and their second harmonic or any other source with intermediate wavelength, such as a dye laser (near 600 nm).

EKSMA offers:

• Crystal size up to 10×10×15 mm or 5×5×20 mm
• Singleband and dualband AR and BBAR coatings
• Standard and customised mounts and housings 
• Technical consultations

EKSMA guarantees:

• Accurate quality control
• One month customer’s satisfaction term
• Conformity of crystal specifications to highest standards
• Attractive prices
• Fast delivery

Custom manufacturing capabilities:

• the mass production of KDP and its isomorphs is available
• OEM customers are granted with special attractive discounts
• different shapes (slabs, cylinders, Brewster ends) are available
• AR, BBAR and P - coatings according to customer’s choice

Applications:

• Harmonic generators
• Electro-optical modulators.
  

Applications

• Harmonic generators
• Thin LiIO₃ for autocorrelation measurements.

EKSMA offers:

• The mass production of LiIO₃ crystals
• Attractive discounts for OEM customers
• Different shapes (slabs, cylinders, Brewster ends) are available
• Standard open ring holders
• Recoating and repolishing service
• AR, BBAR and P - coatings according to customer’s choice
• P-coatings optimised at pump wavelengths
• BBAR coatings for wavelength tuned Ti:Sapphire and other lasers

Standard product specifications:

Thin crystals for ultrashort pulse applications are available from EKSMA Co. Optimal thickness nonlinear crystals are used for:

• harmonic generation (SHG, SFG)
• optical parametric generation and amplification (OPG, OPA)
• laser pulses auto and cross correlation
• difference frequency generation (DFG)

The crystals of thickness down to 100 µm can be prepared as free standing crystals (not attached on any kind of support). However the ring mounts are highly recommended for the safe handling of these thin crystals. The tolerance is ±50 µm for crystals of thickness down to 300 µm and ±20 µm for crystals of thickness down to 100 µm.

Free standing crystals:

* the thickness should be about 2 mm for max aperture KDP and LiIO₃.

BBO, LBO and KDP crystals of thickness less than 100 µm can be supplied optically contacted on UV Fused Silica substrates sizes 10×10×2 mm or 12×12×2 mm. Other sizes of substrates are also available on request. The tolerances of BBO and LBO crystal thickness are +10/-5 µm, for KDP and LiIO₃ ±10 µm.

Optically contacted crystals:

EKSMA Co. provides various AR, BBAR and protective coatings for all free standing crystals. The coatings are not available for optically contacted crystals.

Ring mounts made from anodized aluminium are available for the safe and convenient handling of ultrathin crystals. The standard sizes are dia 1” and 25 or 30 mm. The thickness of mount is 10 mm. Custom shape and size mounts are available too.

Optical nonlinear crystals like ZnGeP₂, AgGaSe₂, AgGaS₂, GaSe, Tl₃AsSe₃ have gained tremendous interest for the middle and deep infrared applications due to their unique features. The crystals have large effective optical nonlinearity, wide spectral and angular acceptance, broad transparency range, noncritical requirements for temperature stabilisation and vibration control, are well mechanically processed (except of GaSe and Tl₃AsSe₃).

ZnGeP₂ has band edges at 0.74 and 12 µm. Its useful transmission range lies from 2.1 to 10.6 µm with absoprtion α lower than 0.04 cm^-1. ZnGeP₂ has the largest nonlinear optical coefficient and relatively high laser damage threshold. It was successfully used in the following applications: up-conversion of CO₂ laser light to near IR range⁽¹⁾ via mixing with 1.06 mm; sum frequency generation of CO and CO₂ laser radiation⁽²⁾; efficient SHG of pulsed CO⁽³⁾, CO₂⁽⁴⁾ (49% efficiency at 1 GW/cm² intensity of 2 ns pulses, 9.52 mm wavelength) and chemical DF-laser⁽⁵⁾, OPO light generation in mid infrared when pumped by erbium^(6,7) and holmium⁽⁸⁾ lasers.

AgGaSe₂⁽⁹⁾ has band edges at 0.73 and 18 µm. Its useful transmission range lying within 0.9–16 µm and wide phase matchability provide excellent potential for OPO applications when pumped by variety of currently available lasers. Tuning within 2.5–12 µm was obtained when pumped by Ho:YLF laser at 2.05 µm⁽¹⁰⁾; NCPM operation within 1.9–5.5 µm was achieved⁽¹¹⁾ pumping at 1.4–1.55 µm. Efficient SHG of pulsed CO2 laser is demonstrated⁽¹²⁾.

AgGaS₂ is transparent from 0.53 to 12 µm. Although nonlinear optical  coefficient is the lowest among the above mentioned infrared crystals, its high short wavelength transparency edging at 550 nm is used in OPOs^(13,14) pumped by Nd:YAG laser; in numerous difference frequency mixing experiments^{(15,16,17,18)} using diode, Ti:Sapphire, Nd:YAG and IR dye   lasers covering 3–12 µm range; direct infrared countermeasure systems, and SHG of CO₂ laser⁽¹⁹⁾.

GaSe has band edges at 0.65 and 18 µm. GaSe has been successfully used for efficient SHG of CO₂  laser⁽²¹⁾ (up to 9% conversion); for SHG of pulsed CO, CO₂ and chemical DF-laser (l = 2.36 µm) radiation⁽²⁷⁾; upconversion of CO and CO₂ laser radiation into the visible range⁽²⁰⁾; infrared pulses generation via difference frequency mixing of Neodymium and  infrared dye laser^(22,15) or (F-)-centre laser pulses⁽²⁵⁾; OPG light generation within 3.5–18 µm⁽²⁴⁾. It is impossibile to cut crystals for certain phase matching angles because of material structure (cleave along (001) plane) limiting areas of applications.