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KTP Crystal Features

KTP Crystal Applications

1. SHG of Nd:Laser - 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. To date, extra- and intra-cavity frequency doubled Nd:lasers using KTP have become a preferred pumping source for visible dye lasers and tunable Ti:Sapphire lasers as well as their amplifiers. 1mW to 3W TEMoo green laser can be generated by intracavity SHG in Nd:YVO₄ and Nd:YAG laser.
KTP is also being used for intracavity mixing of 0.81µm diode and 1.064µm Nd:YAG laser to generate blue light and intracavity SHG of Nd:YAG or Nd:YAP lasers at 1.3µm to produce red light.

2. OPO/OPA - KTP is suitable for Nd:YAG and SHG or Ti:Sapphire laser pumped OPO/OPA. Pumped by the fundamental and second harmonic of a Nd:YAG or Nd:YLF laser, KTP's OPO/OPA can generate tunable output in 600-4500nm.

3. E-O Modulator - KTP is used as E-O modulator in mode-locking diode laser pumped Nd:YAG and Nd:YLF laser as well as Ti:Sapphire and Cr:LiSrAlF₆ laser. Due to its higher damage threshold, wide optical bandwidth, low loss, good thermal and mechanical stability, KTP is expected to replace LiNbO₃ crystal in application of E-O modulators.

4. Application for Optical Waveguides - Based on the ion-exchange process on KTP substrate, KTP optical waveguides  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 waveguides have been applied to the type I quasi-phase-matchable SHG of a tunable Ti:Sapphire laser in the range of 760-960nm, and directly doubled diode lasers for the 400-430nm outputs.