Potassium Titanyl Phosphate (KTP)

Product Information

Potassium Titanyl Phosphate is a crystalline solid used in photo optic applications. KTP is the most commonly used material for SHG of Nd-doped lasers, and also for SFG to generate blue&red light. In addition to these functions, it is also applied to OPO, E-O devices and waveguides. It can be widely used in lasers including laboratory, medical systems, range-finders, lidar, and optical communication, and industrial systems

Synonyms

KTP, Periodically poled potassium titanyl phosphate, PPKTP, Potassium titanium oxide phosphate (KTiO(PO4)), Grey-track Resistant Potassium Titanyl Phosphate (GTR-KTP)

Potassium Titanyl Phosphate Specification

Size：1x1x0.05 - 30x30x40 mm , Large crystal size up to 20 × 20 × 40 mm3 and maximum length of 60 mm ,customized

Per your request or drawing

We can customized as required

Properties（Theoretical）

Optical and Nonlinear Optical Properties

Featured

· Large nonlinear optical coefficient

· 　　Wide angular bandwidth and small walk-off angle

· 　　Broad temperature and spectral bandwidth

· 　　High electro-optic coefficient and low dielectric constant

· 　　Large figure of merit

· 　　Nonhydroscopic, chemically and mechanically stable

Applications of Potassium Titanyl Phosphate

Typical applications of KTP

● Frequency doubling (SHG) of Nd-doped lasers for green/red output

● Frequency mixing (SFM) of Nd laser and diode laser for blue output

● Parametric sources (OPG, OPA and OPO) for 600 nm-4500 nm tunable output

● E-O modulators, optical switches, directional couplers

● Optical waveguides for integrated NLO and E-O devices

1.      Applications for SHG and SFG of Nd: Lasers KTP is the most commonly used material for frequency doubling of Nd:YAG and other Nd-doped lasers, particularly when the power density is at a low or medium level. Up to now, Nd:lasers that use KTP for intra-cavity and extra-cavity frequency doubling have become a preferred pumping sources for visible dye lasers and tunable Ti:sapphire lasers as well as their amplifiers. They are also used as green sources for many research and industry applications. Close to 80% conversion efficiency and 700 mJ green laser were obtained with a 900 mJ injection-seeded Q-switch Nd:YAG lasers by using extra-cavity KTP. 8 W green laser was generated from a 15 W LD pumped Nd:YVO4 with intra-cavity KTP. KTP is also being used for intracavity mixing of 0.81 µm diode and 1.064 µm Nd:YAG laser to generate blue light and intracavity SHG of Nd:YAG or Nd:YAP lasers at 1.3 µm to produce red light.

2.      Applications for OPG, OPA and OPO,As an efficient OPO crystal pumped by a Nd:laser and its second harmonics, KTP plays an important role for parametric sources for tunable outputs from visible (600 nm) to mid-IR (4500 nm). Generally, KTP's OPOs provide stable and continuous pulse outputs (signal and idler) in fs, with 108 Hz repetition rate and a miniwatt average power level. A KTP's OPO that are pumped by a 1064 nm Nd:YAG laser has generated as high as above 66% efficiency for degenerately converting to 2120 nm. The novel developed application is the non-critical phase matched (NCPM) KTP's OPO/OPA. for pumping wavelength range from 0.7 µm to 1 µm, the output can cover from 1.04 µm to 1.45 µm (signal) and from 2.15 µm to 3.2 µm (idler). More than 45% conversion efficiency was obtained with narrow output bandwidth and good beam quality.

3.      Applications for E-O DevicesIn addition to unique features, KTP also has promising E-O and dielectric properties that are comparable to LiNbO3. These excellent properties make KTP extremely useful to various E-O devices. Table 1 is a comparison of KTP with other E-O modulator materials commonly used:

Electro-Optic Modulator Materials

From Table ,clearly, KTP is expected to replace LiNbO3 crystal in the considerable volume application of E-O modulators, when other merits of KTP are combined into account, such as high damage threshold, wide optical bandwidth (˃15 GHZ), thermal and mechanical stability, and low loss, etc.

4．Applications for Optical Waveguides

Based on the ion-exchange process on KTP substrate, low loss optical waveguides developed for KTP have created novel applications in integrated optics. Recently, a type Ⅱ SHG conversion efficiency of 20% /W/cm2 was achieved by the balanced phase matching, in which the phase mismatch from one section was balanced against a phase mismatch in the opposite sign from the second. Furthermore, segmented KTP waveguide have been applied to the type Ⅰ quasi-phase-matchable SHG of a tunable Ti:Sapphire laser in the range of 760-960 mm, and directly doubled diode lasers for the 400-430 nm outputs.

Electro-Optic Waveguide Materials

AR-coatings

ATT provides the following AR-coatings:

·   Dual Band AR-coating (DBAR) of KTP for SHG of 1064 nm; low reflectance (R<0.2% @1064 nm and R<0.5% @532 nm)

·   High reflectivity coating: HR 1064 nm & HT 532 nm, R˃99.8% @1064nm, T˃90% @532 nm

·   Broad Band AR-coating (BBAR) of KTP for OPO applications

·   High damage threshold (˃300 MW/cm2 at both wavelengths)

·   Long durability

·   Other coatings are available upon request

Packing of Potassium Titanyl Phosphate

Standard Packing:

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes Special package is available on request.

ATTs’ Potassium Titanyl Phosphate is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.

Chemical Identifiers