TimeShift™ Technology

Quasar is the first laser of this class to offer TimeShift technology, which enables pulse energy programmability in the time domain. By controlling the laser pulse (width and shape) in time and repetition rate, material removal and/or modification in micromachining becomes more efficient, thereby increasing process speed and quality. Utilizing TimeShift in conjunction with high UV or green power at a higher repetition rate means Quasar can process more materials faster, and with greater quality. TimeShift enables pulse width variation, as well as pulse splitting and burst mode operation. For the Quasar 355-60 and 532-95 models, pulse widths from <2 ns to >100 ns can be created at a constant PRF or conversely, maintain constant pulse width with varying repetition rate from 0 to 3.5 MHz. A set of standard TimeShift waveforms is provided with each Quasar. The TimeShift GUI, which enables users to develop custom waveforms, is available at additional pricing.

TimeShift Technology Flexibility and Benefits

TimeShift Constant Pulse Width vs PRF

Unlike conventional Q-switched lasers, Quasar’s TimeShift technology can maintain constant pulse width over a wide range of PRF. Constant pulse width means the peak power remains more constant allowing for more consistent process results at higher speeds.

Pulse Width vs Repetition Rate¹

Actual Pulse Traces of Constant Pulse Widths vs PRF¹

10 ns at 200 kHz1,2

10 ns at 300 kHz1,2

10 ns at 500 kHz1,2

TimeShift Variable Pulse Width and Pulse Shaping

Varying the pulse width for a given PRF can be used to optimize the material interaction. By changing the energy and intensity within a pulse (pulse shaping), the heating or cooling of the material is further optimized.

30 ns at 200 kHz1,2	50 ns at 200 kHz1,2	100 ns at 200 kHz1,2
10 ns, 2:1 height ratio1,2	10 ns, 1:2 height ratio1,2

TimeShift Pulse Splitting and Burst Mode

By splitting the pulses at a given PRF, the material is allowed to dissipate the heat or plasma such that more efficient material removal is possible. By altering the number, spacing, and relativity intensity of pulses within the burst, the spatial-temporal thermal profile in the work piece can be precisely tailored, increasing process speed and/or quality.

6 x 10 ns sub-pulses1,2

10 x 5 ns sub-pulses (Burst Mode)1,2

1. Typically measured performance; not a guaranteed or warranted specification.
2. Vertical range on oscilloscope set so that pulse peak is 75% of window.

1. Due to our continuous product improvement program, specifications may change without notice.
2. All 355 nm test specs are at 10 ns at 300 kHz with the diode current set to achieve 62 W for the Quasar 355-60, and 42 W for the Quasar 355-45. All 532 nm test specs are at 10 ns at 200 kHz with the diode current set to achieve 95 W for the Quasar 532-95, and 75 W for the Quasar 532-75.
3. Applies at 10 ns over the repetition rate range of 250 kHz to 400 kHz, using the appropriate TimeShift setup at the same input current set to achieve 300 kHz for Quasar 355-60, and input current to achieve 42 W 355 nm at 300 kHz for Quasar 355-45. Applies at 10 ns at 200 kHz for 75 W 532 nm version and at 10 ns 200 kHz for the 95 W 532 nm version.
4. The nominal pulse width is 10 ns. Alternative/programmable pulse widths using TimeShift will change power and beam parameter performance. Contact Spectra-Physics for more information.
5. Dimensions noted do not include the standard removable lifting hoist exoskeleton or the optional removable lift handles.

Quasar Laser Head Dimensions

Quasar Power Supply Dimensions

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