Del Mar Photonics

Customer inquiry:
I'm requesting a quote for a Multishot-FROG (including a laptop and software to do the FROG retrieval) for a fiber laser system that consists of an oscillator and an amplifier (free space coupling is possible). I want to do measurements with both:

I've attached a spectrum recorded for the oscillator and for one setting of the amplifier (I want to try out many different settings there). The rep rate of the oscillator is about 63 MHz, pulse length in the order of 1 ps (Fourier transform limited is 170 fs). The average power will be > 20 mW (still needs to be optimised). The rep rate of the amplifier is flexible and will most likely be chosen to be around 1 MHz or smaller and the amplification can be adjusted, on average I'd like to keep the average power equal and just lower the rep rate.

I would like to achieve a sensitivity down to 1 W2 (P_peak * P_avg) for quantitative measurements and 0.1 W2 for qualitative measurements.

I would like a 200 micron thick SHG crystal and one 500 micron thick one, to be able to have optimum settings for the amplifier and the oscillator. And a cooled CCD spectrometer for optimum sensitivity (I was thinking about the QE65000).


Reef-FROG 11.1101 - request a quote

DelMarFS-Ultra Reef-FROG Scan Ultra Platform includes one crystal
QE65000 Scientific, cooled CCD spectrometer set for a wavelength range for Yb fiber laser
DelMar-vFROGscan vFROG scan real time data acquisition and analysis software
SHG Crystal, Standard mounted 500 um crystal


Autocorrelator Reef RT, Del Mar Photonics, San Diego, CA
Reef femtosecond autocorrelators
The autocorrelation technique is the most common method used to determine laser pulse width characteristics on a femtosecond time scale.
The basic optical configuration of the autocorrelator is similar to that of an interferometer (Figure.1). An incoming pulse train is split into two beams of equal intensity. An adjustable optical delay is inserted into one of the arms. The two beams are then recombined within a nonlinear material (semiconductor) for two photon absorption (TPA). The incident pulses directly generate a nonlinear TPA photocurrent in the semiconductor, and the detection of this photocurrent as a function of interferometer optical delay between the interacting pulses yields the pulse autocorrelation function. The TPA process is polarization-independent and non-phasematched, simplifying alignment.

Reef-RT autocorrelator measures laser pulse durations ranging from 20 femtoseconds to picosecond regime. It measures pulse widths from both low energy, high repetition rate oscillators and high energy, low repetition rate amplifiers. Compact control unit operates autocorrelator head and optional spectrometer through on-screen menus. Autocorrelation trace and spectrum can be displayed and analyzed on screen or downloaded to remote computer.

New: Reef-20DDR autocorrelator
Collinear (interferometric) autocorrelation for 1300-2000 nm wavelength range