Optoelectronics

Quadrant photodiode from LASER COMPONENTS

3rd June 2021
Alex Lynn

LASER COMPONENTS offers a wide range of photodiode detectors with high performance.

LASER COMPONENTS offers a wide range of photodiode detectors with high performance. The company offers both silicon and InGaAs quadrant photodiodes, which are suited for beam positioning/centroiding applications for visible and NIR wavelengths respectively.  

These are available in a variety of packages and as bare die in higher volumes.

LASER COMPONENTS has also developed a beam splitter in which the combined beam of a frequency-doubled laser is split in such a way that 50% of each of the two wavelengths is split off, even if they have different polarisations. The polarisation remains the same for both beams. Previously, a beam splitter and a retardation plate were required for this process.

The manufacturer from Olching near Munich has now succeeded in combining both functions into one optic. This allows the setup and maintenance of optics to be significantly accelerated in the future.

The original design is for 1,030 and 515nm. However, wavelengths, polarisation, and reflection/transmission ratio can be individually adapted depending on the application.

Finally, LASER COMPONENTS has introduced the high spectral resolution IQFROG, available in 1.0μm and 1.5μm wavelength versions which allows the measurement for the second harmonic spectrum of a pulse. The resolution of the spectral measurement often limits the broadest pulse width that a pulse analyser can measure.

The IQFROG has a built-in high-resolution spectrometer to enable measurement of transform-limited pulses of up to 10ps width, or broader if the pulse has a frequency chirp.  The system uses a long mechanical translation stage to provide up to 200ps of scan range to allow autocorrelation measurement of up to 50ps long pulses.  It is a pulse analysers that can measure such broad picosecond pulses, as well as short pulses down to 300fs width. In comparison the competitive SPIDER technique is limited in the ability to measure pulses broader than 1ps.

The IQFROG can scan and save autocorrelation traces, even if the pulse is too broad (with a very narrow spectral width) or is unsuitable for FROG recovery.  The IQFROG can also be used as an autocorrelator.

The connectorised input makes coupling of the beam easy and fast by eliminating the need to align the beam into the unit manually.  The IQFROG is by far the most easy-to-use optical pulse analyser on the market. The mechanical control, alignment and tuning is controlled by the software, no more need to align manually.

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